Patch-mainline: v4.18-rc1
Git-commit: 8d860bbeedef97fe981d28fa7b71d77f3b29563f
From: Jim Mattson <jmattson@google.com>
Date: Wed, 9 May 2018 16:56:05 -0400
Subject: [PATCH] kvm: vmx: Basic APIC virtualization controls have three
settings
References: bsc#1182310
Previously, we toggled between SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE
and SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES, depending on whether or
not the EXTD bit was set in MSR_IA32_APICBASE. However, if the local
APIC is disabled, we should not set either of these APIC
virtualization control bits.
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
---
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/kvm/lapic.c | 12 ++++-----
arch/x86/kvm/svm.c | 4 +--
arch/x86/kvm/vmx.c | 48 ++++++++++++++++++++-------------
4 files changed, 38 insertions(+), 28 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 8cb846162694..187c8e09a019 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -995,7 +995,7 @@ struct kvm_x86_ops {
void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
void (*hwapic_isr_update)(struct kvm_vcpu *vcpu, int isr);
void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
- void (*set_virtual_x2apic_mode)(struct kvm_vcpu *vcpu, bool set);
+ void (*set_virtual_apic_mode)(struct kvm_vcpu *vcpu);
void (*set_apic_access_page_addr)(struct kvm_vcpu *vcpu, hpa_t hpa);
void (*deliver_posted_interrupt)(struct kvm_vcpu *vcpu, int vector);
int (*sync_pir_to_irr)(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index b74c9c1405b9..776391cf69a5 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1990,13 +1990,11 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
}
}
- if ((old_value ^ value) & X2APIC_ENABLE) {
- if (value & X2APIC_ENABLE) {
- kvm_apic_set_x2apic_id(apic, vcpu->vcpu_id);
- kvm_x86_ops->set_virtual_x2apic_mode(vcpu, true);
- } else
- kvm_x86_ops->set_virtual_x2apic_mode(vcpu, false);
- }
+ if (((old_value ^ value) & X2APIC_ENABLE) && (value & X2APIC_ENABLE))
+ kvm_apic_set_x2apic_id(apic, vcpu->vcpu_id);
+
+ if ((old_value ^ value) & (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE))
+ kvm_x86_ops->set_virtual_apic_mode(vcpu);
apic->base_address = apic->vcpu->arch.apic_base &
MSR_IA32_APICBASE_BASE;
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 1fc05e428aba..220e5a89465a 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5036,7 +5036,7 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
}
-static void svm_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
+static void svm_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
{
return;
}
@@ -7076,7 +7076,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.enable_nmi_window = enable_nmi_window,
.enable_irq_window = enable_irq_window,
.update_cr8_intercept = update_cr8_intercept,
- .set_virtual_x2apic_mode = svm_set_virtual_x2apic_mode,
+ .set_virtual_apic_mode = svm_set_virtual_apic_mode,
.get_enable_apicv = svm_get_enable_apicv,
.refresh_apicv_exec_ctrl = svm_refresh_apicv_exec_ctrl,
.load_eoi_exitmap = svm_load_eoi_exitmap,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 467cab4e0efd..4149c5ee09fc 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -481,7 +481,8 @@ struct nested_vmx {
*/
bool sync_shadow_vmcs;
- bool change_vmcs01_virtual_x2apic_mode;
+ bool change_vmcs01_virtual_apic_mode;
+
/* L2 must run next, and mustn't decide to exit to L1. */
bool nested_run_pending;
@@ -9281,31 +9282,43 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
vmcs_write32(TPR_THRESHOLD, irr);
}
-static void vmx_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
+static void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
{
u32 sec_exec_control;
+ if (!lapic_in_kernel(vcpu))
+ return;
+
/* Postpone execution until vmcs01 is the current VMCS. */
if (is_guest_mode(vcpu)) {
- to_vmx(vcpu)->nested.change_vmcs01_virtual_x2apic_mode = true;
+ to_vmx(vcpu)->nested.change_vmcs01_virtual_apic_mode = true;
return;
}
- if (!cpu_has_vmx_virtualize_x2apic_mode())
- return;
-
if (!cpu_need_tpr_shadow(vcpu))
return;
sec_exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
+ sec_exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
+ SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE);
- if (set) {
- sec_exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
- sec_exec_control |= SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE;
- } else {
- sec_exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE;
- sec_exec_control |= SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
- vmx_flush_tlb(vcpu, true);
+ switch (kvm_get_apic_mode(vcpu)) {
+ case LAPIC_MODE_INVALID:
+ WARN_ONCE(true, "Invalid local APIC state");
+ case LAPIC_MODE_DISABLED:
+ break;
+ case LAPIC_MODE_XAPIC:
+ if (flexpriority_enabled) {
+ sec_exec_control |=
+ SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
+ vmx_flush_tlb(vcpu, true);
+ }
+ break;
+ case LAPIC_MODE_X2APIC:
+ if (cpu_has_vmx_virtualize_x2apic_mode())
+ sec_exec_control |=
+ SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE;
+ break;
}
vmcs_write32(SECONDARY_VM_EXEC_CONTROL, sec_exec_control);
@@ -12087,10 +12100,9 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
if (kvm_has_tsc_control)
decache_tsc_multiplier(vmx);
- if (vmx->nested.change_vmcs01_virtual_x2apic_mode) {
- vmx->nested.change_vmcs01_virtual_x2apic_mode = false;
- vmx_set_virtual_x2apic_mode(vcpu,
- vcpu->arch.apic_base & X2APIC_ENABLE);
+ if (vmx->nested.change_vmcs01_virtual_apic_mode) {
+ vmx->nested.change_vmcs01_virtual_apic_mode = false;
+ vmx_set_virtual_apic_mode(vcpu);
} else if (!nested_cpu_has_ept(vmcs12) &&
nested_cpu_has2(vmcs12,
SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
@@ -12718,7 +12730,7 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.enable_nmi_window = enable_nmi_window,
.enable_irq_window = enable_irq_window,
.update_cr8_intercept = update_cr8_intercept,
- .set_virtual_x2apic_mode = vmx_set_virtual_x2apic_mode,
+ .set_virtual_apic_mode = vmx_set_virtual_apic_mode,
.set_apic_access_page_addr = vmx_set_apic_access_page_addr,
.get_enable_apicv = vmx_get_enable_apicv,
.refresh_apicv_exec_ctrl = vmx_refresh_apicv_exec_ctrl,
--
2.26.2