KVM: selftests: Add processor code for s390x
Code that takes care of basic CPU setup, page table walking, etc. Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <20190523164309.13345-7-thuth@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>alistair/sunxi64-5.4-dsi
Thomas Huth
Christian Borntraeger
parent
da2a2d601c
commit
edf54478d8
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@ -8674,6 +8674,7 @@ F: arch/s390/include/asm/gmap.h
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F: arch/s390/include/asm/kvm*
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F: arch/s390/kvm/
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F: arch/s390/mm/gmap.c
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F: tools/testing/selftests/kvm/*/s390x/
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KERNEL VIRTUAL MACHINE FOR X86 (KVM/x86)
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M: Paolo Bonzini <pbonzini@redhat.com>
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@ -10,6 +10,7 @@ UNAME_M := $(shell uname -m)
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LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/ucall.c lib/sparsebit.c
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LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c
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LIBKVM_aarch64 = lib/aarch64/processor.c
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LIBKVM_s390x = lib/s390x/processor.c
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TEST_GEN_PROGS_x86_64 = x86_64/platform_info_test
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TEST_GEN_PROGS_x86_64 += x86_64/set_sregs_test
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@ -0,0 +1,22 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* s390x processor specific defines
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*/
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#ifndef SELFTEST_KVM_PROCESSOR_H
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#define SELFTEST_KVM_PROCESSOR_H
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/* Bits in the region/segment table entry */
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#define REGION_ENTRY_ORIGIN ~0xfffUL /* region/segment table origin */
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#define REGION_ENTRY_PROTECT 0x200 /* region protection bit */
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#define REGION_ENTRY_NOEXEC 0x100 /* region no-execute bit */
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#define REGION_ENTRY_OFFSET 0xc0 /* region table offset */
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#define REGION_ENTRY_INVALID 0x20 /* invalid region table entry */
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#define REGION_ENTRY_TYPE 0x0c /* region/segment table type mask */
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#define REGION_ENTRY_LENGTH 0x03 /* region third length */
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/* Bits in the page table entry */
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#define PAGE_INVALID 0x400 /* HW invalid bit */
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#define PAGE_PROTECT 0x200 /* HW read-only bit */
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#define PAGE_NOEXEC 0x100 /* HW no-execute bit */
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#endif
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@ -0,0 +1,286 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* KVM selftest s390x library code - CPU-related functions (page tables...)
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*
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* Copyright (C) 2019, Red Hat, Inc.
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*/
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#define _GNU_SOURCE /* for program_invocation_name */
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#include "processor.h"
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#include "kvm_util.h"
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#include "../kvm_util_internal.h"
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#define KVM_GUEST_PAGE_TABLE_MIN_PADDR 0x180000
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#define PAGES_PER_REGION 4
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void virt_pgd_alloc(struct kvm_vm *vm, uint32_t memslot)
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{
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vm_paddr_t paddr;
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TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
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vm->page_size);
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if (vm->pgd_created)
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return;
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paddr = vm_phy_pages_alloc(vm, PAGES_PER_REGION,
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KVM_GUEST_PAGE_TABLE_MIN_PADDR, memslot);
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memset(addr_gpa2hva(vm, paddr), 0xff, PAGES_PER_REGION * vm->page_size);
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vm->pgd = paddr;
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vm->pgd_created = true;
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}
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/*
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* Allocate 4 pages for a region/segment table (ri < 4), or one page for
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* a page table (ri == 4). Returns a suitable region/segment table entry
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* which points to the freshly allocated pages.
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*/
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static uint64_t virt_alloc_region(struct kvm_vm *vm, int ri, uint32_t memslot)
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{
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uint64_t taddr;
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taddr = vm_phy_pages_alloc(vm, ri < 4 ? PAGES_PER_REGION : 1,
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KVM_GUEST_PAGE_TABLE_MIN_PADDR, memslot);
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memset(addr_gpa2hva(vm, taddr), 0xff, PAGES_PER_REGION * vm->page_size);
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return (taddr & REGION_ENTRY_ORIGIN)
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| (((4 - ri) << 2) & REGION_ENTRY_TYPE)
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| ((ri < 4 ? (PAGES_PER_REGION - 1) : 0) & REGION_ENTRY_LENGTH);
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}
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/*
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* VM Virtual Page Map
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*
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* Input Args:
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* vm - Virtual Machine
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* gva - VM Virtual Address
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* gpa - VM Physical Address
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* memslot - Memory region slot for new virtual translation tables
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*
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* Output Args: None
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*
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* Return: None
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*
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* Within the VM given by vm, creates a virtual translation for the page
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* starting at vaddr to the page starting at paddr.
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*/
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void virt_pg_map(struct kvm_vm *vm, uint64_t gva, uint64_t gpa,
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uint32_t memslot)
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{
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int ri, idx;
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uint64_t *entry;
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TEST_ASSERT((gva % vm->page_size) == 0,
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"Virtual address not on page boundary,\n"
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" vaddr: 0x%lx vm->page_size: 0x%x",
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gva, vm->page_size);
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TEST_ASSERT(sparsebit_is_set(vm->vpages_valid,
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(gva >> vm->page_shift)),
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"Invalid virtual address, vaddr: 0x%lx",
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gva);
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TEST_ASSERT((gpa % vm->page_size) == 0,
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"Physical address not on page boundary,\n"
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" paddr: 0x%lx vm->page_size: 0x%x",
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gva, vm->page_size);
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TEST_ASSERT((gpa >> vm->page_shift) <= vm->max_gfn,
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"Physical address beyond beyond maximum supported,\n"
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" paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
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gva, vm->max_gfn, vm->page_size);
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/* Walk through region and segment tables */
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entry = addr_gpa2hva(vm, vm->pgd);
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for (ri = 1; ri <= 4; ri++) {
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idx = (gva >> (64 - 11 * ri)) & 0x7ffu;
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if (entry[idx] & REGION_ENTRY_INVALID)
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entry[idx] = virt_alloc_region(vm, ri, memslot);
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entry = addr_gpa2hva(vm, entry[idx] & REGION_ENTRY_ORIGIN);
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}
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/* Fill in page table entry */
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idx = (gva >> 12) & 0x0ffu; /* page index */
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if (!(entry[idx] & PAGE_INVALID))
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fprintf(stderr,
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"WARNING: PTE for gpa=0x%"PRIx64" already set!\n", gpa);
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entry[idx] = gpa;
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}
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/*
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* Address Guest Virtual to Guest Physical
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*
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* Input Args:
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* vm - Virtual Machine
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* gpa - VM virtual address
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*
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* Output Args: None
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*
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* Return:
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* Equivalent VM physical address
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*
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* Translates the VM virtual address given by gva to a VM physical
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* address and then locates the memory region containing the VM
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* physical address, within the VM given by vm. When found, the host
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* virtual address providing the memory to the vm physical address is
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* returned.
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* A TEST_ASSERT failure occurs if no region containing translated
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* VM virtual address exists.
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*/
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vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
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{
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int ri, idx;
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uint64_t *entry;
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TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
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vm->page_size);
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entry = addr_gpa2hva(vm, vm->pgd);
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for (ri = 1; ri <= 4; ri++) {
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idx = (gva >> (64 - 11 * ri)) & 0x7ffu;
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TEST_ASSERT(!(entry[idx] & REGION_ENTRY_INVALID),
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"No region mapping for vm virtual address 0x%lx",
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gva);
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entry = addr_gpa2hva(vm, entry[idx] & REGION_ENTRY_ORIGIN);
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}
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idx = (gva >> 12) & 0x0ffu; /* page index */
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TEST_ASSERT(!(entry[idx] & PAGE_INVALID),
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"No page mapping for vm virtual address 0x%lx", gva);
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return (entry[idx] & ~0xffful) + (gva & 0xffful);
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}
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static void virt_dump_ptes(FILE *stream, struct kvm_vm *vm, uint8_t indent,
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uint64_t ptea_start)
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{
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uint64_t *pte, ptea;
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for (ptea = ptea_start; ptea < ptea_start + 0x100 * 8; ptea += 8) {
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pte = addr_gpa2hva(vm, ptea);
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if (*pte & PAGE_INVALID)
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continue;
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fprintf(stream, "%*spte @ 0x%lx: 0x%016lx\n",
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indent, "", ptea, *pte);
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}
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}
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static void virt_dump_region(FILE *stream, struct kvm_vm *vm, uint8_t indent,
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uint64_t reg_tab_addr)
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{
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uint64_t addr, *entry;
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for (addr = reg_tab_addr; addr < reg_tab_addr + 0x400 * 8; addr += 8) {
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entry = addr_gpa2hva(vm, addr);
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if (*entry & REGION_ENTRY_INVALID)
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continue;
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fprintf(stream, "%*srt%lde @ 0x%lx: 0x%016lx\n",
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indent, "", 4 - ((*entry & REGION_ENTRY_TYPE) >> 2),
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addr, *entry);
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if (*entry & REGION_ENTRY_TYPE) {
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virt_dump_region(stream, vm, indent + 2,
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*entry & REGION_ENTRY_ORIGIN);
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} else {
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virt_dump_ptes(stream, vm, indent + 2,
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*entry & REGION_ENTRY_ORIGIN);
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}
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}
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}
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void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
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{
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if (!vm->pgd_created)
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return;
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virt_dump_region(stream, vm, indent, vm->pgd);
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}
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/*
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* Create a VM with reasonable defaults
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*
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* Input Args:
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* vcpuid - The id of the single VCPU to add to the VM.
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* extra_mem_pages - The size of extra memories to add (this will
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* decide how much extra space we will need to
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* setup the page tables using mem slot 0)
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* guest_code - The vCPU's entry point
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*
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* Output Args: None
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*
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* Return:
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* Pointer to opaque structure that describes the created VM.
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*/
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struct kvm_vm *vm_create_default(uint32_t vcpuid, uint64_t extra_mem_pages,
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void *guest_code)
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{
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/*
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* The additional amount of pages required for the page tables is:
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* 1 * n / 256 + 4 * (n / 256) / 2048 + 4 * (n / 256) / 2048^2 + ...
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* which is definitely smaller than (n / 256) * 2.
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*/
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uint64_t extra_pg_pages = extra_mem_pages / 256 * 2;
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struct kvm_vm *vm;
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vm = vm_create(VM_MODE_DEFAULT,
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DEFAULT_GUEST_PHY_PAGES + extra_pg_pages, O_RDWR);
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kvm_vm_elf_load(vm, program_invocation_name, 0, 0);
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vm_vcpu_add_default(vm, vcpuid, guest_code);
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return vm;
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}
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/*
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* Adds a vCPU with reasonable defaults (i.e. a stack and initial PSW)
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*
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* Input Args:
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* vcpuid - The id of the VCPU to add to the VM.
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* guest_code - The vCPU's entry point
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*/
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void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
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{
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size_t stack_size = DEFAULT_STACK_PGS * getpagesize();
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uint64_t stack_vaddr;
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struct kvm_regs regs;
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struct kvm_sregs sregs;
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struct kvm_run *run;
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TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
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vm->page_size);
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stack_vaddr = vm_vaddr_alloc(vm, stack_size,
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DEFAULT_GUEST_STACK_VADDR_MIN, 0, 0);
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vm_vcpu_add(vm, vcpuid, 0, 0);
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/* Setup guest registers */
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vcpu_regs_get(vm, vcpuid, ®s);
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regs.gprs[15] = stack_vaddr + (DEFAULT_STACK_PGS * getpagesize()) - 160;
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vcpu_regs_set(vm, vcpuid, ®s);
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vcpu_sregs_get(vm, vcpuid, &sregs);
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sregs.crs[1] = vm->pgd | 0xf; /* Primary region table */
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vcpu_sregs_set(vm, vcpuid, &sregs);
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run = vcpu_state(vm, vcpuid);
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run->psw_mask = 0x0400000180000000ULL; /* DAT enabled + 64 bit mode */
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run->psw_addr = (uintptr_t)guest_code;
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}
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void vcpu_setup(struct kvm_vm *vm, int vcpuid, int pgd_memslot, int gdt_memslot)
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{
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struct kvm_sregs sregs;
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vcpu_sregs_get(vm, vcpuid, &sregs);
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sregs.crs[0] |= 0x00040000; /* Enable floating point regs */
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vcpu_sregs_set(vm, vcpuid, &sregs);
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}
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void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
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{
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struct vcpu *vcpu = vm->vcpu_head;
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fprintf(stream, "%*spstate: psw: 0x%.16llx:0x%.16llx\n",
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indent, "", vcpu->state->psw_mask, vcpu->state->psw_addr);
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}
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