[PATCH v2 3/5] KVM: x86: Use common 'enable_apicv' variable for both APICv and AVIC
From: Vitaly Kuznetsov
Date: Tue May 18 2021 - 10:44:05 EST
Unify VMX and SVM code by moving APICv/AVIC enablement tracking to common
'enable_apicv' variable. Note: unlike APICv, AVIC is disabled by default.
No functional change intended.
Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/svm/avic.c | 14 +++++---------
arch/x86/kvm/svm/svm.c | 23 ++++++++++++++---------
arch/x86/kvm/svm/svm.h | 2 --
arch/x86/kvm/vmx/capabilities.h | 1 -
arch/x86/kvm/vmx/vmx.c | 1 -
arch/x86/kvm/x86.c | 3 +++
7 files changed, 23 insertions(+), 22 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 55efbacfc244..a2197fcf0e7c 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1422,6 +1422,7 @@ struct kvm_arch_async_pf {
extern u32 __read_mostly kvm_nr_uret_msrs;
extern u64 __read_mostly host_efer;
extern bool __read_mostly allow_smaller_maxphyaddr;
+extern bool __read_mostly enable_apicv;
extern struct kvm_x86_ops kvm_x86_ops;
#define KVM_X86_OP(func) \
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 1c1bf911e02b..05cd0b128b02 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -27,10 +27,6 @@
#include "irq.h"
#include "svm.h"
-/* enable / disable AVIC */
-int avic;
-module_param(avic, int, S_IRUGO);
-
#define SVM_AVIC_DOORBELL 0xc001011b
#define AVIC_HPA_MASK ~((0xFFFULL << 52) | 0xFFF)
@@ -124,7 +120,7 @@ void avic_vm_destroy(struct kvm *kvm)
unsigned long flags;
struct kvm_svm *kvm_svm = to_kvm_svm(kvm);
- if (!avic)
+ if (!enable_apicv)
return;
if (kvm_svm->avic_logical_id_table_page)
@@ -147,7 +143,7 @@ int avic_vm_init(struct kvm *kvm)
struct page *l_page;
u32 vm_id;
- if (!avic)
+ if (!enable_apicv)
return 0;
/* Allocating physical APIC ID table (4KB) */
@@ -569,7 +565,7 @@ int avic_init_vcpu(struct vcpu_svm *svm)
int ret;
struct kvm_vcpu *vcpu = &svm->vcpu;
- if (!avic || !irqchip_in_kernel(vcpu->kvm))
+ if (!enable_apicv || !irqchip_in_kernel(vcpu->kvm))
return 0;
ret = avic_init_backing_page(vcpu);
@@ -593,7 +589,7 @@ void avic_post_state_restore(struct kvm_vcpu *vcpu)
void svm_toggle_avic_for_irq_window(struct kvm_vcpu *vcpu, bool activate)
{
- if (!avic || !lapic_in_kernel(vcpu))
+ if (!enable_apicv || !lapic_in_kernel(vcpu))
return;
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
@@ -653,7 +649,7 @@ void svm_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
struct vmcb *vmcb = svm->vmcb;
bool activated = kvm_vcpu_apicv_active(vcpu);
- if (!avic)
+ if (!enable_apicv)
return;
if (activated) {
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 8c3918a11826..0d6ec34d1e4b 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -185,6 +185,10 @@ module_param(vls, int, 0444);
static int vgif = true;
module_param(vgif, int, 0444);
+/* enable / disable AVIC */
+static int avic;
+module_param(avic, int, 0444);
+
bool __read_mostly dump_invalid_vmcb;
module_param(dump_invalid_vmcb, bool, 0644);
@@ -1009,14 +1013,15 @@ static __init int svm_hardware_setup(void)
nrips = false;
}
- if (avic) {
- if (!npt_enabled || !boot_cpu_has(X86_FEATURE_AVIC)) {
- avic = false;
- } else {
- pr_info("AVIC enabled\n");
+ if (!npt_enabled || !boot_cpu_has(X86_FEATURE_AVIC))
+ avic = false;
- amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
- }
+ /* 'enable_apicv' is common between VMX/SVM but the defaults differ */
+ enable_apicv = avic;
+ if (enable_apicv) {
+ pr_info("AVIC enabled\n");
+
+ amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
}
if (vls) {
@@ -4427,13 +4432,13 @@ static int svm_vm_init(struct kvm *kvm)
if (!pause_filter_count || !pause_filter_thresh)
kvm->arch.pause_in_guest = true;
- if (avic) {
+ if (enable_apicv) {
int ret = avic_vm_init(kvm);
if (ret)
return ret;
}
- kvm_apicv_init(kvm, avic);
+ kvm_apicv_init(kvm, enable_apicv);
return 0;
}
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index e44567ceb865..a514b490db4a 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -479,8 +479,6 @@ extern struct kvm_x86_nested_ops svm_nested_ops;
#define VMCB_AVIC_APIC_BAR_MASK 0xFFFFFFFFFF000ULL
-extern int avic;
-
static inline void avic_update_vapic_bar(struct vcpu_svm *svm, u64 data)
{
svm->vmcb->control.avic_vapic_bar = data & VMCB_AVIC_APIC_BAR_MASK;
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index aa0e7872fcc9..4705ad55abb5 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -12,7 +12,6 @@ extern bool __read_mostly enable_ept;
extern bool __read_mostly enable_unrestricted_guest;
extern bool __read_mostly enable_ept_ad_bits;
extern bool __read_mostly enable_pml;
-extern bool __read_mostly enable_apicv;
extern int __read_mostly pt_mode;
#define PT_MODE_SYSTEM 0
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 4bceb5ca3a89..5e9ba10e9c2d 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -101,7 +101,6 @@ module_param(emulate_invalid_guest_state, bool, S_IRUGO);
static bool __read_mostly fasteoi = 1;
module_param(fasteoi, bool, S_IRUGO);
-bool __read_mostly enable_apicv = 1;
module_param(enable_apicv, bool, S_IRUGO);
/*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9b6bca616929..23fdbba6b394 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -209,6 +209,9 @@ EXPORT_SYMBOL_GPL(host_efer);
bool __read_mostly allow_smaller_maxphyaddr = 0;
EXPORT_SYMBOL_GPL(allow_smaller_maxphyaddr);
+bool __read_mostly enable_apicv = true;
+EXPORT_SYMBOL_GPL(enable_apicv);
+
u64 __read_mostly host_xss;
EXPORT_SYMBOL_GPL(host_xss);
u64 __read_mostly supported_xss;
--
2.31.1