![Ladi Prosek](/assets/img/avatar_default.png)
The assist page has been used only for the paravirtual EOI so far, hence the "APIC" in the MSR name. Renaming to match the Hyper-V TLFS where it's called "Virtual VP Assist MSR". Signed-off-by: Ladi Prosek <lprosek@redhat.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
1454 lines
37 KiB
C
1454 lines
37 KiB
C
/*
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* KVM Microsoft Hyper-V emulation
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*
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* derived from arch/x86/kvm/x86.c
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*
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* Copyright (C) 2006 Qumranet, Inc.
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* Copyright (C) 2008 Qumranet, Inc.
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* Copyright IBM Corporation, 2008
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* Copyright 2010 Red Hat, Inc. and/or its affiliates.
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* Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
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*
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* Authors:
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* Avi Kivity <avi@qumranet.com>
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* Yaniv Kamay <yaniv@qumranet.com>
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* Amit Shah <amit.shah@qumranet.com>
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* Ben-Ami Yassour <benami@il.ibm.com>
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* Andrey Smetanin <asmetanin@virtuozzo.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "x86.h"
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#include "lapic.h"
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#include "ioapic.h"
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#include "hyperv.h"
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#include <linux/kvm_host.h>
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#include <linux/highmem.h>
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#include <linux/sched/cputime.h>
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#include <linux/eventfd.h>
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#include <asm/apicdef.h>
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#include <trace/events/kvm.h>
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#include "trace.h"
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static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
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{
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return atomic64_read(&synic->sint[sint]);
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}
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static inline int synic_get_sint_vector(u64 sint_value)
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{
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if (sint_value & HV_SYNIC_SINT_MASKED)
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return -1;
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return sint_value & HV_SYNIC_SINT_VECTOR_MASK;
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}
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static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic,
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int vector)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
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if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
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return true;
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}
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return false;
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}
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static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic,
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int vector)
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{
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int i;
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u64 sint_value;
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for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
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sint_value = synic_read_sint(synic, i);
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if (synic_get_sint_vector(sint_value) == vector &&
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sint_value & HV_SYNIC_SINT_AUTO_EOI)
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return true;
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}
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return false;
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}
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static void synic_update_vector(struct kvm_vcpu_hv_synic *synic,
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int vector)
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{
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if (vector < HV_SYNIC_FIRST_VALID_VECTOR)
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return;
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if (synic_has_vector_connected(synic, vector))
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__set_bit(vector, synic->vec_bitmap);
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else
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__clear_bit(vector, synic->vec_bitmap);
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if (synic_has_vector_auto_eoi(synic, vector))
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__set_bit(vector, synic->auto_eoi_bitmap);
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else
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__clear_bit(vector, synic->auto_eoi_bitmap);
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}
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static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
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u64 data, bool host)
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{
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int vector, old_vector;
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bool masked;
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vector = data & HV_SYNIC_SINT_VECTOR_MASK;
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masked = data & HV_SYNIC_SINT_MASKED;
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/*
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* Valid vectors are 16-255, however, nested Hyper-V attempts to write
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* default '0x10000' value on boot and this should not #GP. We need to
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* allow zero-initing the register from host as well.
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*/
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if (vector < HV_SYNIC_FIRST_VALID_VECTOR && !host && !masked)
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return 1;
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/*
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* Guest may configure multiple SINTs to use the same vector, so
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* we maintain a bitmap of vectors handled by synic, and a
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* bitmap of vectors with auto-eoi behavior. The bitmaps are
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* updated here, and atomically queried on fast paths.
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*/
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old_vector = synic_read_sint(synic, sint) & HV_SYNIC_SINT_VECTOR_MASK;
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atomic64_set(&synic->sint[sint], data);
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synic_update_vector(synic, old_vector);
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synic_update_vector(synic, vector);
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/* Load SynIC vectors into EOI exit bitmap */
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kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic));
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return 0;
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}
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static struct kvm_vcpu *get_vcpu_by_vpidx(struct kvm *kvm, u32 vpidx)
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{
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struct kvm_vcpu *vcpu = NULL;
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int i;
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if (vpidx < KVM_MAX_VCPUS)
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vcpu = kvm_get_vcpu(kvm, vpidx);
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if (vcpu && vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
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return vcpu;
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kvm_for_each_vcpu(i, vcpu, kvm)
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if (vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
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return vcpu;
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return NULL;
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}
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static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vpidx)
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{
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struct kvm_vcpu *vcpu;
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struct kvm_vcpu_hv_synic *synic;
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vcpu = get_vcpu_by_vpidx(kvm, vpidx);
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if (!vcpu)
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return NULL;
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synic = vcpu_to_synic(vcpu);
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return (synic->active) ? synic : NULL;
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}
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static void synic_clear_sint_msg_pending(struct kvm_vcpu_hv_synic *synic,
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u32 sint)
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{
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struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
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struct page *page;
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gpa_t gpa;
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struct hv_message *msg;
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struct hv_message_page *msg_page;
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gpa = synic->msg_page & PAGE_MASK;
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page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
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if (is_error_page(page)) {
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vcpu_err(vcpu, "Hyper-V SynIC can't get msg page, gpa 0x%llx\n",
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gpa);
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return;
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}
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msg_page = kmap_atomic(page);
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msg = &msg_page->sint_message[sint];
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msg->header.message_flags.msg_pending = 0;
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kunmap_atomic(msg_page);
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kvm_release_page_dirty(page);
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kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
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}
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static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
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{
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struct kvm *kvm = vcpu->kvm;
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struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
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struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
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struct kvm_vcpu_hv_stimer *stimer;
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int gsi, idx, stimers_pending;
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trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
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if (synic->msg_page & HV_SYNIC_SIMP_ENABLE)
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synic_clear_sint_msg_pending(synic, sint);
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/* Try to deliver pending Hyper-V SynIC timers messages */
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stimers_pending = 0;
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for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
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stimer = &hv_vcpu->stimer[idx];
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if (stimer->msg_pending &&
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(stimer->config & HV_STIMER_ENABLE) &&
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HV_STIMER_SINT(stimer->config) == sint) {
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set_bit(stimer->index,
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hv_vcpu->stimer_pending_bitmap);
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stimers_pending++;
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}
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}
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if (stimers_pending)
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kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
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idx = srcu_read_lock(&kvm->irq_srcu);
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gsi = atomic_read(&synic->sint_to_gsi[sint]);
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if (gsi != -1)
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kvm_notify_acked_gsi(kvm, gsi);
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srcu_read_unlock(&kvm->irq_srcu, idx);
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}
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static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr)
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{
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struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
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struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
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hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC;
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hv_vcpu->exit.u.synic.msr = msr;
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hv_vcpu->exit.u.synic.control = synic->control;
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hv_vcpu->exit.u.synic.evt_page = synic->evt_page;
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hv_vcpu->exit.u.synic.msg_page = synic->msg_page;
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kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
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}
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static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
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u32 msr, u64 data, bool host)
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{
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struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
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int ret;
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if (!synic->active)
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return 1;
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trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
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ret = 0;
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switch (msr) {
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case HV_X64_MSR_SCONTROL:
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synic->control = data;
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if (!host)
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synic_exit(synic, msr);
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break;
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case HV_X64_MSR_SVERSION:
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if (!host) {
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ret = 1;
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break;
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}
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synic->version = data;
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break;
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case HV_X64_MSR_SIEFP:
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if ((data & HV_SYNIC_SIEFP_ENABLE) && !host &&
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!synic->dont_zero_synic_pages)
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if (kvm_clear_guest(vcpu->kvm,
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data & PAGE_MASK, PAGE_SIZE)) {
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ret = 1;
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break;
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}
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synic->evt_page = data;
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if (!host)
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synic_exit(synic, msr);
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break;
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case HV_X64_MSR_SIMP:
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if ((data & HV_SYNIC_SIMP_ENABLE) && !host &&
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!synic->dont_zero_synic_pages)
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if (kvm_clear_guest(vcpu->kvm,
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data & PAGE_MASK, PAGE_SIZE)) {
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ret = 1;
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break;
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}
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synic->msg_page = data;
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if (!host)
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synic_exit(synic, msr);
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break;
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case HV_X64_MSR_EOM: {
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int i;
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for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
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kvm_hv_notify_acked_sint(vcpu, i);
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break;
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}
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case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
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ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
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break;
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default:
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ret = 1;
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break;
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}
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return ret;
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}
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static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata)
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{
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int ret;
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if (!synic->active)
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return 1;
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ret = 0;
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switch (msr) {
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case HV_X64_MSR_SCONTROL:
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*pdata = synic->control;
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break;
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case HV_X64_MSR_SVERSION:
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*pdata = synic->version;
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break;
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case HV_X64_MSR_SIEFP:
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*pdata = synic->evt_page;
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break;
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case HV_X64_MSR_SIMP:
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*pdata = synic->msg_page;
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break;
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case HV_X64_MSR_EOM:
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*pdata = 0;
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break;
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case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
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*pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]);
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break;
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default:
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ret = 1;
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break;
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}
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return ret;
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}
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static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
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{
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struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
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struct kvm_lapic_irq irq;
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int ret, vector;
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if (sint >= ARRAY_SIZE(synic->sint))
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return -EINVAL;
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vector = synic_get_sint_vector(synic_read_sint(synic, sint));
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if (vector < 0)
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return -ENOENT;
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memset(&irq, 0, sizeof(irq));
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irq.shorthand = APIC_DEST_SELF;
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irq.dest_mode = APIC_DEST_PHYSICAL;
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irq.delivery_mode = APIC_DM_FIXED;
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irq.vector = vector;
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irq.level = 1;
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ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL);
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trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
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return ret;
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}
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int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint)
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{
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struct kvm_vcpu_hv_synic *synic;
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synic = synic_get(kvm, vpidx);
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if (!synic)
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return -EINVAL;
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return synic_set_irq(synic, sint);
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}
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void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector)
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{
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struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
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int i;
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trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector);
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for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
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if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
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kvm_hv_notify_acked_sint(vcpu, i);
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}
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static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi)
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{
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struct kvm_vcpu_hv_synic *synic;
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synic = synic_get(kvm, vpidx);
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if (!synic)
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return -EINVAL;
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if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
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return -EINVAL;
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atomic_set(&synic->sint_to_gsi[sint], gsi);
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return 0;
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}
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void kvm_hv_irq_routing_update(struct kvm *kvm)
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{
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struct kvm_irq_routing_table *irq_rt;
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struct kvm_kernel_irq_routing_entry *e;
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u32 gsi;
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irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
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lockdep_is_held(&kvm->irq_lock));
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for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) {
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hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
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if (e->type == KVM_IRQ_ROUTING_HV_SINT)
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kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu,
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e->hv_sint.sint, gsi);
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}
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}
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}
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static void synic_init(struct kvm_vcpu_hv_synic *synic)
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{
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int i;
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memset(synic, 0, sizeof(*synic));
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synic->version = HV_SYNIC_VERSION_1;
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for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
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atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED);
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atomic_set(&synic->sint_to_gsi[i], -1);
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}
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}
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static u64 get_time_ref_counter(struct kvm *kvm)
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{
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struct kvm_hv *hv = &kvm->arch.hyperv;
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struct kvm_vcpu *vcpu;
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u64 tsc;
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/*
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* The guest has not set up the TSC page or the clock isn't
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* stable, fall back to get_kvmclock_ns.
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*/
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if (!hv->tsc_ref.tsc_sequence)
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return div_u64(get_kvmclock_ns(kvm), 100);
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vcpu = kvm_get_vcpu(kvm, 0);
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tsc = kvm_read_l1_tsc(vcpu, rdtsc());
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return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64)
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+ hv->tsc_ref.tsc_offset;
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}
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static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
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bool vcpu_kick)
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{
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struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
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set_bit(stimer->index,
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vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
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kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
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if (vcpu_kick)
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kvm_vcpu_kick(vcpu);
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}
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static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer)
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{
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struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
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|
|
trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index);
|
|
|
|
hrtimer_cancel(&stimer->timer);
|
|
clear_bit(stimer->index,
|
|
vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
|
|
stimer->msg_pending = false;
|
|
stimer->exp_time = 0;
|
|
}
|
|
|
|
static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
|
|
{
|
|
struct kvm_vcpu_hv_stimer *stimer;
|
|
|
|
stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer);
|
|
trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index);
|
|
stimer_mark_pending(stimer, true);
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
/*
|
|
* stimer_start() assumptions:
|
|
* a) stimer->count is not equal to 0
|
|
* b) stimer->config has HV_STIMER_ENABLE flag
|
|
*/
|
|
static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
|
|
{
|
|
u64 time_now;
|
|
ktime_t ktime_now;
|
|
|
|
time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm);
|
|
ktime_now = ktime_get();
|
|
|
|
if (stimer->config & HV_STIMER_PERIODIC) {
|
|
if (stimer->exp_time) {
|
|
if (time_now >= stimer->exp_time) {
|
|
u64 remainder;
|
|
|
|
div64_u64_rem(time_now - stimer->exp_time,
|
|
stimer->count, &remainder);
|
|
stimer->exp_time =
|
|
time_now + (stimer->count - remainder);
|
|
}
|
|
} else
|
|
stimer->exp_time = time_now + stimer->count;
|
|
|
|
trace_kvm_hv_stimer_start_periodic(
|
|
stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index,
|
|
time_now, stimer->exp_time);
|
|
|
|
hrtimer_start(&stimer->timer,
|
|
ktime_add_ns(ktime_now,
|
|
100 * (stimer->exp_time - time_now)),
|
|
HRTIMER_MODE_ABS);
|
|
return 0;
|
|
}
|
|
stimer->exp_time = stimer->count;
|
|
if (time_now >= stimer->count) {
|
|
/*
|
|
* Expire timer according to Hypervisor Top-Level Functional
|
|
* specification v4(15.3.1):
|
|
* "If a one shot is enabled and the specified count is in
|
|
* the past, it will expire immediately."
|
|
*/
|
|
stimer_mark_pending(stimer, false);
|
|
return 0;
|
|
}
|
|
|
|
trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index,
|
|
time_now, stimer->count);
|
|
|
|
hrtimer_start(&stimer->timer,
|
|
ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)),
|
|
HRTIMER_MODE_ABS);
|
|
return 0;
|
|
}
|
|
|
|
static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
|
|
bool host)
|
|
{
|
|
trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index, config, host);
|
|
|
|
stimer_cleanup(stimer);
|
|
if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0)
|
|
config &= ~HV_STIMER_ENABLE;
|
|
stimer->config = config;
|
|
stimer_mark_pending(stimer, false);
|
|
return 0;
|
|
}
|
|
|
|
static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
|
|
bool host)
|
|
{
|
|
trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index, count, host);
|
|
|
|
stimer_cleanup(stimer);
|
|
stimer->count = count;
|
|
if (stimer->count == 0)
|
|
stimer->config &= ~HV_STIMER_ENABLE;
|
|
else if (stimer->config & HV_STIMER_AUTOENABLE)
|
|
stimer->config |= HV_STIMER_ENABLE;
|
|
stimer_mark_pending(stimer, false);
|
|
return 0;
|
|
}
|
|
|
|
static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
|
|
{
|
|
*pconfig = stimer->config;
|
|
return 0;
|
|
}
|
|
|
|
static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
|
|
{
|
|
*pcount = stimer->count;
|
|
return 0;
|
|
}
|
|
|
|
static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
|
|
struct hv_message *src_msg)
|
|
{
|
|
struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
|
|
struct page *page;
|
|
gpa_t gpa;
|
|
struct hv_message *dst_msg;
|
|
int r;
|
|
struct hv_message_page *msg_page;
|
|
|
|
if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
|
|
return -ENOENT;
|
|
|
|
gpa = synic->msg_page & PAGE_MASK;
|
|
page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
|
|
if (is_error_page(page))
|
|
return -EFAULT;
|
|
|
|
msg_page = kmap_atomic(page);
|
|
dst_msg = &msg_page->sint_message[sint];
|
|
if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE,
|
|
src_msg->header.message_type) != HVMSG_NONE) {
|
|
dst_msg->header.message_flags.msg_pending = 1;
|
|
r = -EAGAIN;
|
|
} else {
|
|
memcpy(&dst_msg->u.payload, &src_msg->u.payload,
|
|
src_msg->header.payload_size);
|
|
dst_msg->header.message_type = src_msg->header.message_type;
|
|
dst_msg->header.payload_size = src_msg->header.payload_size;
|
|
r = synic_set_irq(synic, sint);
|
|
if (r >= 1)
|
|
r = 0;
|
|
else if (r == 0)
|
|
r = -EFAULT;
|
|
}
|
|
kunmap_atomic(msg_page);
|
|
kvm_release_page_dirty(page);
|
|
kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
|
|
return r;
|
|
}
|
|
|
|
static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
|
|
{
|
|
struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
|
|
struct hv_message *msg = &stimer->msg;
|
|
struct hv_timer_message_payload *payload =
|
|
(struct hv_timer_message_payload *)&msg->u.payload;
|
|
|
|
payload->expiration_time = stimer->exp_time;
|
|
payload->delivery_time = get_time_ref_counter(vcpu->kvm);
|
|
return synic_deliver_msg(vcpu_to_synic(vcpu),
|
|
HV_STIMER_SINT(stimer->config), msg);
|
|
}
|
|
|
|
static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
|
|
{
|
|
int r;
|
|
|
|
stimer->msg_pending = true;
|
|
r = stimer_send_msg(stimer);
|
|
trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index, r);
|
|
if (!r) {
|
|
stimer->msg_pending = false;
|
|
if (!(stimer->config & HV_STIMER_PERIODIC))
|
|
stimer->config &= ~HV_STIMER_ENABLE;
|
|
}
|
|
}
|
|
|
|
void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
|
|
struct kvm_vcpu_hv_stimer *stimer;
|
|
u64 time_now, exp_time;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
|
|
if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) {
|
|
stimer = &hv_vcpu->stimer[i];
|
|
if (stimer->config & HV_STIMER_ENABLE) {
|
|
exp_time = stimer->exp_time;
|
|
|
|
if (exp_time) {
|
|
time_now =
|
|
get_time_ref_counter(vcpu->kvm);
|
|
if (time_now >= exp_time)
|
|
stimer_expiration(stimer);
|
|
}
|
|
|
|
if ((stimer->config & HV_STIMER_ENABLE) &&
|
|
stimer->count) {
|
|
if (!stimer->msg_pending)
|
|
stimer_start(stimer);
|
|
} else
|
|
stimer_cleanup(stimer);
|
|
}
|
|
}
|
|
}
|
|
|
|
void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
|
|
stimer_cleanup(&hv_vcpu->stimer[i]);
|
|
}
|
|
|
|
static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer)
|
|
{
|
|
struct hv_message *msg = &stimer->msg;
|
|
struct hv_timer_message_payload *payload =
|
|
(struct hv_timer_message_payload *)&msg->u.payload;
|
|
|
|
memset(&msg->header, 0, sizeof(msg->header));
|
|
msg->header.message_type = HVMSG_TIMER_EXPIRED;
|
|
msg->header.payload_size = sizeof(*payload);
|
|
|
|
payload->timer_index = stimer->index;
|
|
payload->expiration_time = 0;
|
|
payload->delivery_time = 0;
|
|
}
|
|
|
|
static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index)
|
|
{
|
|
memset(stimer, 0, sizeof(*stimer));
|
|
stimer->index = timer_index;
|
|
hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
|
|
stimer->timer.function = stimer_timer_callback;
|
|
stimer_prepare_msg(stimer);
|
|
}
|
|
|
|
void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
|
|
int i;
|
|
|
|
synic_init(&hv_vcpu->synic);
|
|
|
|
bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
|
|
for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
|
|
stimer_init(&hv_vcpu->stimer[i], i);
|
|
}
|
|
|
|
void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
|
|
|
|
hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu);
|
|
}
|
|
|
|
int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
|
|
{
|
|
struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
|
|
|
|
/*
|
|
* Hyper-V SynIC auto EOI SINT's are
|
|
* not compatible with APICV, so deactivate APICV
|
|
*/
|
|
kvm_vcpu_deactivate_apicv(vcpu);
|
|
synic->active = true;
|
|
synic->dont_zero_synic_pages = dont_zero_synic_pages;
|
|
return 0;
|
|
}
|
|
|
|
static bool kvm_hv_msr_partition_wide(u32 msr)
|
|
{
|
|
bool r = false;
|
|
|
|
switch (msr) {
|
|
case HV_X64_MSR_GUEST_OS_ID:
|
|
case HV_X64_MSR_HYPERCALL:
|
|
case HV_X64_MSR_REFERENCE_TSC:
|
|
case HV_X64_MSR_TIME_REF_COUNT:
|
|
case HV_X64_MSR_CRASH_CTL:
|
|
case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
|
|
case HV_X64_MSR_RESET:
|
|
case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
|
|
case HV_X64_MSR_TSC_EMULATION_CONTROL:
|
|
case HV_X64_MSR_TSC_EMULATION_STATUS:
|
|
r = true;
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
|
|
u32 index, u64 *pdata)
|
|
{
|
|
struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
|
|
|
|
if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
|
|
return -EINVAL;
|
|
|
|
*pdata = hv->hv_crash_param[index];
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata)
|
|
{
|
|
struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
|
|
|
|
*pdata = hv->hv_crash_ctl;
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host)
|
|
{
|
|
struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
|
|
|
|
if (host)
|
|
hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY;
|
|
|
|
if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) {
|
|
|
|
vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
|
|
hv->hv_crash_param[0],
|
|
hv->hv_crash_param[1],
|
|
hv->hv_crash_param[2],
|
|
hv->hv_crash_param[3],
|
|
hv->hv_crash_param[4]);
|
|
|
|
/* Send notification about crash to user space */
|
|
kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu,
|
|
u32 index, u64 data)
|
|
{
|
|
struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
|
|
|
|
if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
|
|
return -EINVAL;
|
|
|
|
hv->hv_crash_param[index] = data;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The kvmclock and Hyper-V TSC page use similar formulas, and converting
|
|
* between them is possible:
|
|
*
|
|
* kvmclock formula:
|
|
* nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32)
|
|
* + system_time
|
|
*
|
|
* Hyper-V formula:
|
|
* nsec/100 = ticks * scale / 2^64 + offset
|
|
*
|
|
* When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula.
|
|
* By dividing the kvmclock formula by 100 and equating what's left we get:
|
|
* ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
|
|
* scale / 2^64 = tsc_to_system_mul * 2^(tsc_shift-32) / 100
|
|
* scale = tsc_to_system_mul * 2^(32+tsc_shift) / 100
|
|
*
|
|
* Now expand the kvmclock formula and divide by 100:
|
|
* nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32)
|
|
* - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32)
|
|
* + system_time
|
|
* nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
|
|
* - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100
|
|
* + system_time / 100
|
|
*
|
|
* Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64:
|
|
* nsec/100 = ticks * scale / 2^64
|
|
* - tsc_timestamp * scale / 2^64
|
|
* + system_time / 100
|
|
*
|
|
* Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out:
|
|
* offset = system_time / 100 - tsc_timestamp * scale / 2^64
|
|
*
|
|
* These two equivalencies are implemented in this function.
|
|
*/
|
|
static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock,
|
|
HV_REFERENCE_TSC_PAGE *tsc_ref)
|
|
{
|
|
u64 max_mul;
|
|
|
|
if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT))
|
|
return false;
|
|
|
|
/*
|
|
* check if scale would overflow, if so we use the time ref counter
|
|
* tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64
|
|
* tsc_to_system_mul / 100 >= 2^(32-tsc_shift)
|
|
* tsc_to_system_mul >= 100 * 2^(32-tsc_shift)
|
|
*/
|
|
max_mul = 100ull << (32 - hv_clock->tsc_shift);
|
|
if (hv_clock->tsc_to_system_mul >= max_mul)
|
|
return false;
|
|
|
|
/*
|
|
* Otherwise compute the scale and offset according to the formulas
|
|
* derived above.
|
|
*/
|
|
tsc_ref->tsc_scale =
|
|
mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift),
|
|
hv_clock->tsc_to_system_mul,
|
|
100);
|
|
|
|
tsc_ref->tsc_offset = hv_clock->system_time;
|
|
do_div(tsc_ref->tsc_offset, 100);
|
|
tsc_ref->tsc_offset -=
|
|
mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64);
|
|
return true;
|
|
}
|
|
|
|
void kvm_hv_setup_tsc_page(struct kvm *kvm,
|
|
struct pvclock_vcpu_time_info *hv_clock)
|
|
{
|
|
struct kvm_hv *hv = &kvm->arch.hyperv;
|
|
u32 tsc_seq;
|
|
u64 gfn;
|
|
|
|
BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence));
|
|
BUILD_BUG_ON(offsetof(HV_REFERENCE_TSC_PAGE, tsc_sequence) != 0);
|
|
|
|
if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
|
|
return;
|
|
|
|
mutex_lock(&kvm->arch.hyperv.hv_lock);
|
|
if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
|
|
goto out_unlock;
|
|
|
|
gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
|
|
/*
|
|
* Because the TSC parameters only vary when there is a
|
|
* change in the master clock, do not bother with caching.
|
|
*/
|
|
if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn),
|
|
&tsc_seq, sizeof(tsc_seq))))
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* While we're computing and writing the parameters, force the
|
|
* guest to use the time reference count MSR.
|
|
*/
|
|
hv->tsc_ref.tsc_sequence = 0;
|
|
if (kvm_write_guest(kvm, gfn_to_gpa(gfn),
|
|
&hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)))
|
|
goto out_unlock;
|
|
|
|
if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref))
|
|
goto out_unlock;
|
|
|
|
/* Ensure sequence is zero before writing the rest of the struct. */
|
|
smp_wmb();
|
|
if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref)))
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* Now switch to the TSC page mechanism by writing the sequence.
|
|
*/
|
|
tsc_seq++;
|
|
if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0)
|
|
tsc_seq = 1;
|
|
|
|
/* Write the struct entirely before the non-zero sequence. */
|
|
smp_wmb();
|
|
|
|
hv->tsc_ref.tsc_sequence = tsc_seq;
|
|
kvm_write_guest(kvm, gfn_to_gpa(gfn),
|
|
&hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence));
|
|
out_unlock:
|
|
mutex_unlock(&kvm->arch.hyperv.hv_lock);
|
|
}
|
|
|
|
static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
|
|
bool host)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
struct kvm_hv *hv = &kvm->arch.hyperv;
|
|
|
|
switch (msr) {
|
|
case HV_X64_MSR_GUEST_OS_ID:
|
|
hv->hv_guest_os_id = data;
|
|
/* setting guest os id to zero disables hypercall page */
|
|
if (!hv->hv_guest_os_id)
|
|
hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
|
|
break;
|
|
case HV_X64_MSR_HYPERCALL: {
|
|
u64 gfn;
|
|
unsigned long addr;
|
|
u8 instructions[4];
|
|
|
|
/* if guest os id is not set hypercall should remain disabled */
|
|
if (!hv->hv_guest_os_id)
|
|
break;
|
|
if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
|
|
hv->hv_hypercall = data;
|
|
break;
|
|
}
|
|
gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
|
|
addr = gfn_to_hva(kvm, gfn);
|
|
if (kvm_is_error_hva(addr))
|
|
return 1;
|
|
kvm_x86_ops->patch_hypercall(vcpu, instructions);
|
|
((unsigned char *)instructions)[3] = 0xc3; /* ret */
|
|
if (__copy_to_user((void __user *)addr, instructions, 4))
|
|
return 1;
|
|
hv->hv_hypercall = data;
|
|
mark_page_dirty(kvm, gfn);
|
|
break;
|
|
}
|
|
case HV_X64_MSR_REFERENCE_TSC:
|
|
hv->hv_tsc_page = data;
|
|
if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)
|
|
kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
|
|
break;
|
|
case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
|
|
return kvm_hv_msr_set_crash_data(vcpu,
|
|
msr - HV_X64_MSR_CRASH_P0,
|
|
data);
|
|
case HV_X64_MSR_CRASH_CTL:
|
|
return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
|
|
case HV_X64_MSR_RESET:
|
|
if (data == 1) {
|
|
vcpu_debug(vcpu, "hyper-v reset requested\n");
|
|
kvm_make_request(KVM_REQ_HV_RESET, vcpu);
|
|
}
|
|
break;
|
|
case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
|
|
hv->hv_reenlightenment_control = data;
|
|
break;
|
|
case HV_X64_MSR_TSC_EMULATION_CONTROL:
|
|
hv->hv_tsc_emulation_control = data;
|
|
break;
|
|
case HV_X64_MSR_TSC_EMULATION_STATUS:
|
|
hv->hv_tsc_emulation_status = data;
|
|
break;
|
|
default:
|
|
vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
|
|
msr, data);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Calculate cpu time spent by current task in 100ns units */
|
|
static u64 current_task_runtime_100ns(void)
|
|
{
|
|
u64 utime, stime;
|
|
|
|
task_cputime_adjusted(current, &utime, &stime);
|
|
|
|
return div_u64(utime + stime, 100);
|
|
}
|
|
|
|
static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
|
|
{
|
|
struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
|
|
|
|
switch (msr) {
|
|
case HV_X64_MSR_VP_INDEX:
|
|
if (!host)
|
|
return 1;
|
|
hv->vp_index = (u32)data;
|
|
break;
|
|
case HV_X64_MSR_VP_ASSIST_PAGE: {
|
|
u64 gfn;
|
|
unsigned long addr;
|
|
|
|
if (!(data & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) {
|
|
hv->hv_vapic = data;
|
|
if (kvm_lapic_enable_pv_eoi(vcpu, 0))
|
|
return 1;
|
|
break;
|
|
}
|
|
gfn = data >> HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT;
|
|
addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
|
|
if (kvm_is_error_hva(addr))
|
|
return 1;
|
|
if (__clear_user((void __user *)addr, PAGE_SIZE))
|
|
return 1;
|
|
hv->hv_vapic = data;
|
|
kvm_vcpu_mark_page_dirty(vcpu, gfn);
|
|
if (kvm_lapic_enable_pv_eoi(vcpu,
|
|
gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
|
|
return 1;
|
|
break;
|
|
}
|
|
case HV_X64_MSR_EOI:
|
|
return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
|
|
case HV_X64_MSR_ICR:
|
|
return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
|
|
case HV_X64_MSR_TPR:
|
|
return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
|
|
case HV_X64_MSR_VP_RUNTIME:
|
|
if (!host)
|
|
return 1;
|
|
hv->runtime_offset = data - current_task_runtime_100ns();
|
|
break;
|
|
case HV_X64_MSR_SCONTROL:
|
|
case HV_X64_MSR_SVERSION:
|
|
case HV_X64_MSR_SIEFP:
|
|
case HV_X64_MSR_SIMP:
|
|
case HV_X64_MSR_EOM:
|
|
case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
|
|
return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
|
|
case HV_X64_MSR_STIMER0_CONFIG:
|
|
case HV_X64_MSR_STIMER1_CONFIG:
|
|
case HV_X64_MSR_STIMER2_CONFIG:
|
|
case HV_X64_MSR_STIMER3_CONFIG: {
|
|
int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
|
|
|
|
return stimer_set_config(vcpu_to_stimer(vcpu, timer_index),
|
|
data, host);
|
|
}
|
|
case HV_X64_MSR_STIMER0_COUNT:
|
|
case HV_X64_MSR_STIMER1_COUNT:
|
|
case HV_X64_MSR_STIMER2_COUNT:
|
|
case HV_X64_MSR_STIMER3_COUNT: {
|
|
int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
|
|
|
|
return stimer_set_count(vcpu_to_stimer(vcpu, timer_index),
|
|
data, host);
|
|
}
|
|
default:
|
|
vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
|
|
msr, data);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
|
|
{
|
|
u64 data = 0;
|
|
struct kvm *kvm = vcpu->kvm;
|
|
struct kvm_hv *hv = &kvm->arch.hyperv;
|
|
|
|
switch (msr) {
|
|
case HV_X64_MSR_GUEST_OS_ID:
|
|
data = hv->hv_guest_os_id;
|
|
break;
|
|
case HV_X64_MSR_HYPERCALL:
|
|
data = hv->hv_hypercall;
|
|
break;
|
|
case HV_X64_MSR_TIME_REF_COUNT:
|
|
data = get_time_ref_counter(kvm);
|
|
break;
|
|
case HV_X64_MSR_REFERENCE_TSC:
|
|
data = hv->hv_tsc_page;
|
|
break;
|
|
case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
|
|
return kvm_hv_msr_get_crash_data(vcpu,
|
|
msr - HV_X64_MSR_CRASH_P0,
|
|
pdata);
|
|
case HV_X64_MSR_CRASH_CTL:
|
|
return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
|
|
case HV_X64_MSR_RESET:
|
|
data = 0;
|
|
break;
|
|
case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
|
|
data = hv->hv_reenlightenment_control;
|
|
break;
|
|
case HV_X64_MSR_TSC_EMULATION_CONTROL:
|
|
data = hv->hv_tsc_emulation_control;
|
|
break;
|
|
case HV_X64_MSR_TSC_EMULATION_STATUS:
|
|
data = hv->hv_tsc_emulation_status;
|
|
break;
|
|
default:
|
|
vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
|
|
return 1;
|
|
}
|
|
|
|
*pdata = data;
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
|
|
{
|
|
u64 data = 0;
|
|
struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
|
|
|
|
switch (msr) {
|
|
case HV_X64_MSR_VP_INDEX:
|
|
data = hv->vp_index;
|
|
break;
|
|
case HV_X64_MSR_EOI:
|
|
return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
|
|
case HV_X64_MSR_ICR:
|
|
return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
|
|
case HV_X64_MSR_TPR:
|
|
return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
|
|
case HV_X64_MSR_VP_ASSIST_PAGE:
|
|
data = hv->hv_vapic;
|
|
break;
|
|
case HV_X64_MSR_VP_RUNTIME:
|
|
data = current_task_runtime_100ns() + hv->runtime_offset;
|
|
break;
|
|
case HV_X64_MSR_SCONTROL:
|
|
case HV_X64_MSR_SVERSION:
|
|
case HV_X64_MSR_SIEFP:
|
|
case HV_X64_MSR_SIMP:
|
|
case HV_X64_MSR_EOM:
|
|
case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
|
|
return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata);
|
|
case HV_X64_MSR_STIMER0_CONFIG:
|
|
case HV_X64_MSR_STIMER1_CONFIG:
|
|
case HV_X64_MSR_STIMER2_CONFIG:
|
|
case HV_X64_MSR_STIMER3_CONFIG: {
|
|
int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
|
|
|
|
return stimer_get_config(vcpu_to_stimer(vcpu, timer_index),
|
|
pdata);
|
|
}
|
|
case HV_X64_MSR_STIMER0_COUNT:
|
|
case HV_X64_MSR_STIMER1_COUNT:
|
|
case HV_X64_MSR_STIMER2_COUNT:
|
|
case HV_X64_MSR_STIMER3_COUNT: {
|
|
int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
|
|
|
|
return stimer_get_count(vcpu_to_stimer(vcpu, timer_index),
|
|
pdata);
|
|
}
|
|
case HV_X64_MSR_TSC_FREQUENCY:
|
|
data = (u64)vcpu->arch.virtual_tsc_khz * 1000;
|
|
break;
|
|
case HV_X64_MSR_APIC_FREQUENCY:
|
|
data = APIC_BUS_FREQUENCY;
|
|
break;
|
|
default:
|
|
vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
|
|
return 1;
|
|
}
|
|
*pdata = data;
|
|
return 0;
|
|
}
|
|
|
|
int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
|
|
{
|
|
if (kvm_hv_msr_partition_wide(msr)) {
|
|
int r;
|
|
|
|
mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
|
|
r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
|
|
mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
|
|
return r;
|
|
} else
|
|
return kvm_hv_set_msr(vcpu, msr, data, host);
|
|
}
|
|
|
|
int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
|
|
{
|
|
if (kvm_hv_msr_partition_wide(msr)) {
|
|
int r;
|
|
|
|
mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
|
|
r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
|
|
mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
|
|
return r;
|
|
} else
|
|
return kvm_hv_get_msr(vcpu, msr, pdata);
|
|
}
|
|
|
|
bool kvm_hv_hypercall_enabled(struct kvm *kvm)
|
|
{
|
|
return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
|
|
}
|
|
|
|
static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
|
|
{
|
|
bool longmode;
|
|
|
|
longmode = is_64_bit_mode(vcpu);
|
|
if (longmode)
|
|
kvm_register_write(vcpu, VCPU_REGS_RAX, result);
|
|
else {
|
|
kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32);
|
|
kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff);
|
|
}
|
|
}
|
|
|
|
static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_run *run = vcpu->run;
|
|
|
|
kvm_hv_hypercall_set_result(vcpu, run->hyperv.u.hcall.result);
|
|
return 1;
|
|
}
|
|
|
|
static u16 kvm_hvcall_signal_event(struct kvm_vcpu *vcpu, bool fast, u64 param)
|
|
{
|
|
struct eventfd_ctx *eventfd;
|
|
|
|
if (unlikely(!fast)) {
|
|
int ret;
|
|
gpa_t gpa = param;
|
|
|
|
if ((gpa & (__alignof__(param) - 1)) ||
|
|
offset_in_page(gpa) + sizeof(param) > PAGE_SIZE)
|
|
return HV_STATUS_INVALID_ALIGNMENT;
|
|
|
|
ret = kvm_vcpu_read_guest(vcpu, gpa, ¶m, sizeof(param));
|
|
if (ret < 0)
|
|
return HV_STATUS_INVALID_ALIGNMENT;
|
|
}
|
|
|
|
/*
|
|
* Per spec, bits 32-47 contain the extra "flag number". However, we
|
|
* have no use for it, and in all known usecases it is zero, so just
|
|
* report lookup failure if it isn't.
|
|
*/
|
|
if (param & 0xffff00000000ULL)
|
|
return HV_STATUS_INVALID_PORT_ID;
|
|
/* remaining bits are reserved-zero */
|
|
if (param & ~KVM_HYPERV_CONN_ID_MASK)
|
|
return HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
|
|
/* conn_to_evt is protected by vcpu->kvm->srcu */
|
|
eventfd = idr_find(&vcpu->kvm->arch.hyperv.conn_to_evt, param);
|
|
if (!eventfd)
|
|
return HV_STATUS_INVALID_PORT_ID;
|
|
|
|
eventfd_signal(eventfd, 1);
|
|
return HV_STATUS_SUCCESS;
|
|
}
|
|
|
|
int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
|
|
{
|
|
u64 param, ingpa, outgpa, ret = HV_STATUS_SUCCESS;
|
|
uint16_t code, rep_idx, rep_cnt;
|
|
bool fast, longmode;
|
|
|
|
/*
|
|
* hypercall generates UD from non zero cpl and real mode
|
|
* per HYPER-V spec
|
|
*/
|
|
if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
longmode = is_64_bit_mode(vcpu);
|
|
|
|
if (!longmode) {
|
|
param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
|
|
(kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
|
|
ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
|
|
(kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
|
|
outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
|
|
(kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
|
|
}
|
|
#ifdef CONFIG_X86_64
|
|
else {
|
|
param = kvm_register_read(vcpu, VCPU_REGS_RCX);
|
|
ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
|
|
outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
|
|
}
|
|
#endif
|
|
|
|
code = param & 0xffff;
|
|
fast = (param >> 16) & 0x1;
|
|
rep_cnt = (param >> 32) & 0xfff;
|
|
rep_idx = (param >> 48) & 0xfff;
|
|
|
|
trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
|
|
|
|
/* Hypercall continuation is not supported yet */
|
|
if (rep_cnt || rep_idx) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
|
|
goto set_result;
|
|
}
|
|
|
|
switch (code) {
|
|
case HVCALL_NOTIFY_LONG_SPIN_WAIT:
|
|
kvm_vcpu_on_spin(vcpu, true);
|
|
break;
|
|
case HVCALL_SIGNAL_EVENT:
|
|
ret = kvm_hvcall_signal_event(vcpu, fast, ingpa);
|
|
if (ret != HV_STATUS_INVALID_PORT_ID)
|
|
break;
|
|
/* maybe userspace knows this conn_id: fall through */
|
|
case HVCALL_POST_MESSAGE:
|
|
/* don't bother userspace if it has no way to handle it */
|
|
if (!vcpu_to_synic(vcpu)->active) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
|
|
break;
|
|
}
|
|
vcpu->run->exit_reason = KVM_EXIT_HYPERV;
|
|
vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
|
|
vcpu->run->hyperv.u.hcall.input = param;
|
|
vcpu->run->hyperv.u.hcall.params[0] = ingpa;
|
|
vcpu->run->hyperv.u.hcall.params[1] = outgpa;
|
|
vcpu->arch.complete_userspace_io =
|
|
kvm_hv_hypercall_complete_userspace;
|
|
return 0;
|
|
default:
|
|
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
|
|
break;
|
|
}
|
|
|
|
set_result:
|
|
kvm_hv_hypercall_set_result(vcpu, ret);
|
|
return 1;
|
|
}
|
|
|
|
void kvm_hv_init_vm(struct kvm *kvm)
|
|
{
|
|
mutex_init(&kvm->arch.hyperv.hv_lock);
|
|
idr_init(&kvm->arch.hyperv.conn_to_evt);
|
|
}
|
|
|
|
void kvm_hv_destroy_vm(struct kvm *kvm)
|
|
{
|
|
struct eventfd_ctx *eventfd;
|
|
int i;
|
|
|
|
idr_for_each_entry(&kvm->arch.hyperv.conn_to_evt, eventfd, i)
|
|
eventfd_ctx_put(eventfd);
|
|
idr_destroy(&kvm->arch.hyperv.conn_to_evt);
|
|
}
|
|
|
|
static int kvm_hv_eventfd_assign(struct kvm *kvm, u32 conn_id, int fd)
|
|
{
|
|
struct kvm_hv *hv = &kvm->arch.hyperv;
|
|
struct eventfd_ctx *eventfd;
|
|
int ret;
|
|
|
|
eventfd = eventfd_ctx_fdget(fd);
|
|
if (IS_ERR(eventfd))
|
|
return PTR_ERR(eventfd);
|
|
|
|
mutex_lock(&hv->hv_lock);
|
|
ret = idr_alloc(&hv->conn_to_evt, eventfd, conn_id, conn_id + 1,
|
|
GFP_KERNEL);
|
|
mutex_unlock(&hv->hv_lock);
|
|
|
|
if (ret >= 0)
|
|
return 0;
|
|
|
|
if (ret == -ENOSPC)
|
|
ret = -EEXIST;
|
|
eventfd_ctx_put(eventfd);
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_hv_eventfd_deassign(struct kvm *kvm, u32 conn_id)
|
|
{
|
|
struct kvm_hv *hv = &kvm->arch.hyperv;
|
|
struct eventfd_ctx *eventfd;
|
|
|
|
mutex_lock(&hv->hv_lock);
|
|
eventfd = idr_remove(&hv->conn_to_evt, conn_id);
|
|
mutex_unlock(&hv->hv_lock);
|
|
|
|
if (!eventfd)
|
|
return -ENOENT;
|
|
|
|
synchronize_srcu(&kvm->srcu);
|
|
eventfd_ctx_put(eventfd);
|
|
return 0;
|
|
}
|
|
|
|
int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args)
|
|
{
|
|
if ((args->flags & ~KVM_HYPERV_EVENTFD_DEASSIGN) ||
|
|
(args->conn_id & ~KVM_HYPERV_CONN_ID_MASK))
|
|
return -EINVAL;
|
|
|
|
if (args->flags == KVM_HYPERV_EVENTFD_DEASSIGN)
|
|
return kvm_hv_eventfd_deassign(kvm, args->conn_id);
|
|
return kvm_hv_eventfd_assign(kvm, args->conn_id, args->fd);
|
|
}
|