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Date: Wed, 31 Aug 2022 00:34:51 +0000
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>,
Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
Maxim Levitsky <mlevitsk@...hat.com>,
Li RongQing <lirongqing@...du.com>
Subject: [PATCH 04/19] KVM: SVM: Replace "avic_mode" enum with
"x2avic_enabled" boolean
Replace the "avic_mode" enum with a single bool to track whether or not
x2AVIC is enabled. KVM already has "apicv_enabled" that tracks if any
flavor of AVIC is enabled, i.e. AVIC_MODE_NONE and AVIC_MODE_X1 are
redundant and unnecessary noise.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
arch/x86/kvm/svm/avic.c | 45 +++++++++++++++++++----------------------
arch/x86/kvm/svm/svm.c | 2 +-
arch/x86/kvm/svm/svm.h | 9 +--------
3 files changed, 23 insertions(+), 33 deletions(-)
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 1d516d658f9a..b59f8ee2671f 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -53,7 +53,7 @@ static DEFINE_HASHTABLE(svm_vm_data_hash, SVM_VM_DATA_HASH_BITS);
static u32 next_vm_id = 0;
static bool next_vm_id_wrapped = 0;
static DEFINE_SPINLOCK(svm_vm_data_hash_lock);
-enum avic_modes avic_mode;
+bool x2avic_enabled;
/*
* This is a wrapper of struct amd_iommu_ir_data.
@@ -231,8 +231,8 @@ static u64 *avic_get_physical_id_entry(struct kvm_vcpu *vcpu,
u64 *avic_physical_id_table;
struct kvm_svm *kvm_svm = to_kvm_svm(vcpu->kvm);
- if ((avic_mode == AVIC_MODE_X1 && index > AVIC_MAX_PHYSICAL_ID) ||
- (avic_mode == AVIC_MODE_X2 && index > X2AVIC_MAX_PHYSICAL_ID))
+ if ((!x2avic_enabled && index > AVIC_MAX_PHYSICAL_ID) ||
+ (index > X2AVIC_MAX_PHYSICAL_ID))
return NULL;
avic_physical_id_table = page_address(kvm_svm->avic_physical_id_table_page);
@@ -279,8 +279,8 @@ static int avic_init_backing_page(struct kvm_vcpu *vcpu)
int id = vcpu->vcpu_id;
struct vcpu_svm *svm = to_svm(vcpu);
- if ((avic_mode == AVIC_MODE_X1 && id > AVIC_MAX_PHYSICAL_ID) ||
- (avic_mode == AVIC_MODE_X2 && id > X2AVIC_MAX_PHYSICAL_ID))
+ if ((!x2avic_enabled && id > AVIC_MAX_PHYSICAL_ID) ||
+ (id > X2AVIC_MAX_PHYSICAL_ID))
return -EINVAL;
if (!vcpu->arch.apic->regs)
@@ -532,7 +532,7 @@ unsigned long avic_vcpu_get_apicv_inhibit_reasons(struct kvm_vcpu *vcpu)
* AVIC must be disabled if x2AVIC isn't supported and the guest has
* x2APIC enabled.
*/
- if (avic_mode != AVIC_MODE_X2 && apic_x2apic_mode(vcpu->arch.apic))
+ if (!x2avic_enabled && apic_x2apic_mode(vcpu->arch.apic))
return APICV_INHIBIT_REASON_X2APIC;
return 0;
@@ -1086,10 +1086,7 @@ void avic_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb *vmcb = svm->vmcb01.ptr;
- if (!lapic_in_kernel(vcpu) || avic_mode == AVIC_MODE_NONE)
- return;
-
- if (!enable_apicv)
+ if (!lapic_in_kernel(vcpu) || !enable_apicv)
return;
if (kvm_vcpu_apicv_active(vcpu)) {
@@ -1165,32 +1162,32 @@ bool avic_hardware_setup(struct kvm_x86_ops *x86_ops)
if (!npt_enabled)
return false;
+ /* AVIC is a prerequisite for x2AVIC. */
+ if (!boot_cpu_has(X86_FEATURE_AVIC) && !force_avic) {
+ if (boot_cpu_has(X86_FEATURE_X2AVIC)) {
+ pr_warn(FW_BUG "Cannot support x2AVIC due to AVIC is disabled");
+ pr_warn(FW_BUG "Try enable AVIC using force_avic option");
+ }
+ return false;
+ }
+
if (boot_cpu_has(X86_FEATURE_AVIC)) {
- avic_mode = AVIC_MODE_X1;
pr_info("AVIC enabled\n");
} else if (force_avic) {
/*
* Some older systems does not advertise AVIC support.
* See Revision Guide for specific AMD processor for more detail.
*/
- avic_mode = AVIC_MODE_X1;
pr_warn("AVIC is not supported in CPUID but force enabled");
pr_warn("Your system might crash and burn");
}
/* AVIC is a prerequisite for x2AVIC. */
- if (boot_cpu_has(X86_FEATURE_X2AVIC)) {
- if (avic_mode == AVIC_MODE_X1) {
- avic_mode = AVIC_MODE_X2;
- pr_info("x2AVIC enabled\n");
- } else {
- pr_warn(FW_BUG "Cannot support x2AVIC due to AVIC is disabled");
- pr_warn(FW_BUG "Try enable AVIC using force_avic option");
- }
- }
+ x2avic_enabled = boot_cpu_has(X86_FEATURE_X2AVIC);
+ if (x2avic_enabled)
+ pr_info("x2AVIC enabled\n");
- if (avic_mode != AVIC_MODE_NONE)
- amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
+ amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
- return !!avic_mode;
+ return true;
}
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index f3813dbacb9f..b25c89069128 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -821,7 +821,7 @@ void svm_set_x2apic_msr_interception(struct vcpu_svm *svm, bool intercept)
if (intercept == svm->x2avic_msrs_intercepted)
return;
- if (avic_mode != AVIC_MODE_X2 ||
+ if (!x2avic_enabled ||
!apic_x2apic_mode(svm->vcpu.arch.apic))
return;
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 6a7686bf6900..cee79ade400a 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -35,14 +35,7 @@ extern u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
extern bool npt_enabled;
extern int vgif;
extern bool intercept_smi;
-
-enum avic_modes {
- AVIC_MODE_NONE = 0,
- AVIC_MODE_X1,
- AVIC_MODE_X2,
-};
-
-extern enum avic_modes avic_mode;
+extern bool x2avic_enabled;
/*
* Clean bits in VMCB.
--
2.37.2.672.g94769d06f0-goog
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