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KVM: x86: do not scan IRR twice on APICv vmentry 

Calls to apic_find_highest_irr are scanning IRR twice, once
in vmx_sync_pir_from_irr and once in apic_search_irr.  Change
sync_pir_from_irr to get the new maximum IRR from kvm_apic_update_irr;
now that it does the computation, it can also do the RVI write.

In order to avoid complications in svm.c, make the callback optional.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
zero-colors
Paolo Bonzini 2016-12-19 17:17:11 +01:00
parent 3d92789f69
commit 76dfafd536
5 changed files with 28 additions and 28 deletions
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2
arch/x86/include/asm/kvm_host.h
View File

@ -969,7 +969,7 @@ struct kvm_x86_ops {
void (*set_virtual_x2apic_mode)(struct kvm_vcpu *vcpu, bool set);
void (*set_apic_access_page_addr)(struct kvm_vcpu *vcpu, hpa_t hpa);
void (*deliver_posted_interrupt)(struct kvm_vcpu *vcpu, int vector);
void (*sync_pir_to_irr)(struct kvm_vcpu *vcpu);
int (*sync_pir_to_irr)(struct kvm_vcpu *vcpu);
int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
int (*get_tdp_level)(void);
u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);

8
arch/x86/kvm/lapic.c
View File

@ -515,6 +515,7 @@ int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
*/
return apic_find_highest_irr(vcpu->arch.apic);
}
EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
int vector, int level, int trig_mode,
@ -580,9 +581,10 @@ static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
static int apic_has_interrupt_for_ppr(struct kvm_lapic *apic, u32 ppr)
{
int highest_irr;
if (apic->vcpu->arch.apicv_active)
kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
highest_irr = apic_find_highest_irr(apic);
if (kvm_x86_ops->sync_pir_to_irr && apic->vcpu->arch.apicv_active)
highest_irr = kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
else
highest_irr = apic_find_highest_irr(apic);
if (highest_irr == -1 || (highest_irr & 0xF0) <= ppr)
return -1;
return highest_irr;

6
arch/x86/kvm/svm.c
View File

@ -4359,11 +4359,6 @@ static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
return;
}
static void svm_sync_pir_to_irr(struct kvm_vcpu *vcpu)
{
return;
}
static void svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
{
kvm_lapic_set_irr(vec, vcpu->arch.apic);
@ -5373,7 +5368,6 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.get_enable_apicv = svm_get_enable_apicv,
.refresh_apicv_exec_ctrl = svm_refresh_apicv_exec_ctrl,
.load_eoi_exitmap = svm_load_eoi_exitmap,
.sync_pir_to_irr = svm_sync_pir_to_irr,
.hwapic_irr_update = svm_hwapic_irr_update,
.hwapic_isr_update = svm_hwapic_isr_update,
.apicv_post_state_restore = avic_post_state_restore,

31
arch/x86/kvm/vmx.c
View File

@ -6649,8 +6649,10 @@ static __init int hardware_setup(void)
if (!cpu_has_vmx_ple())
ple_gap = 0;
if (!cpu_has_vmx_apicv())
if (!cpu_has_vmx_apicv()) {
enable_apicv = 0;
kvm_x86_ops->sync_pir_to_irr = NULL;
}
if (cpu_has_vmx_tsc_scaling()) {
kvm_has_tsc_control = true;
@ -8722,20 +8724,25 @@ static void vmx_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr)
}
}
static void vmx_sync_pir_to_irr(struct kvm_vcpu *vcpu)
static int vmx_sync_pir_to_irr(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
int max_irr;
if (!pi_test_on(&vmx->pi_desc))
return;
pi_clear_on(&vmx->pi_desc);
/*
* IOMMU can write to PIR.ON, so the barrier matters even on UP.
* But on x86 this is just a compiler barrier anyway.
*/
smp_mb__after_atomic();
kvm_apic_update_irr(vcpu, vmx->pi_desc.pir);
WARN_ON(!vcpu->arch.apicv_active);
if (pi_test_on(&vmx->pi_desc)) {
pi_clear_on(&vmx->pi_desc);
/*
* IOMMU can write to PIR.ON, so the barrier matters even on UP.
* But on x86 this is just a compiler barrier anyway.
*/
smp_mb__after_atomic();
max_irr = kvm_apic_update_irr(vcpu, vmx->pi_desc.pir);
} else {
max_irr = kvm_lapic_find_highest_irr(vcpu);
}
vmx_hwapic_irr_update(vcpu, max_irr);
return max_irr;
}
static void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)

9
arch/x86/kvm/x86.c
View File

@ -2909,7 +2909,7 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
struct kvm_lapic_state *s)
{
if (vcpu->arch.apicv_active)
if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active)
kvm_x86_ops->sync_pir_to_irr(vcpu);
return kvm_apic_get_state(vcpu, s);
@ -6659,7 +6659,7 @@ static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
if (irqchip_split(vcpu->kvm))
kvm_scan_ioapic_routes(vcpu, vcpu->arch.ioapic_handled_vectors);
else {
if (vcpu->arch.apicv_active)
if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active)
kvm_x86_ops->sync_pir_to_irr(vcpu);
kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors);
}
@ -6822,11 +6822,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
* Update architecture specific hints for APIC
* virtual interrupt delivery.
*/
if (vcpu->arch.apicv_active) {
if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active)
kvm_x86_ops->sync_pir_to_irr(vcpu);
kvm_x86_ops->hwapic_irr_update(vcpu,
kvm_lapic_find_highest_irr(vcpu));
}
}
if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {