[PATCH v4 2/5] KVM: x86: Extract kvm_update_cpuid_runtime() from kvm_update_cpuid()
From: Xiaoyao Li
Date: Thu Jul 09 2020 - 00:34:56 EST
Beside called in kvm_vcpu_ioctl_set_cpuid*(), kvm_update_cpuid() is also
called 5 places else in x86.c and 1 place else in lapic.c. All those 6
places only need the part of updating guest CPUIDs (OSXSAVE, OSPKE, APIC,
KVM_FEATURE_PV_UNHALT, ...) based on the runtime vcpu state, so extract
them as a separate kvm_update_cpuid_runtime().
Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
arch/x86/kvm/cpuid.c | 44 +++++++++++++++++++++++++++-----------------
arch/x86/kvm/cpuid.h | 2 +-
arch/x86/kvm/lapic.c | 2 +-
arch/x86/kvm/x86.c | 10 +++++-----
4 files changed, 34 insertions(+), 24 deletions(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 1a053022a961..0ed3b343c44e 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -73,10 +73,9 @@ static int kvm_check_cpuid(struct kvm_vcpu *vcpu)
return 0;
}
-void kvm_update_cpuid(struct kvm_vcpu *vcpu)
+void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;
- struct kvm_lapic *apic = vcpu->arch.apic;
best = kvm_find_cpuid_entry(vcpu, 1, 0);
if (best) {
@@ -89,28 +88,14 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu)
vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE);
}
- if (best && apic) {
- if (cpuid_entry_has(best, X86_FEATURE_TSC_DEADLINE_TIMER))
- apic->lapic_timer.timer_mode_mask = 3 << 17;
- else
- apic->lapic_timer.timer_mode_mask = 1 << 17;
-
- kvm_apic_set_version(vcpu);
- }
-
best = kvm_find_cpuid_entry(vcpu, 7, 0);
if (best && boot_cpu_has(X86_FEATURE_PKU) && best->function == 0x7)
cpuid_entry_change(best, X86_FEATURE_OSPKE,
kvm_read_cr4_bits(vcpu, X86_CR4_PKE));
best = kvm_find_cpuid_entry(vcpu, 0xD, 0);
- if (!best) {
- vcpu->arch.guest_supported_xcr0 = 0;
- } else {
- vcpu->arch.guest_supported_xcr0 =
- (best->eax | ((u64)best->edx << 32)) & supported_xcr0;
+ if (best)
best->ebx = xstate_required_size(vcpu->arch.xcr0, false);
- }
best = kvm_find_cpuid_entry(vcpu, 0xD, 1);
if (best && (cpuid_entry_has(best, X86_FEATURE_XSAVES) ||
@@ -129,6 +114,29 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu)
vcpu->arch.ia32_misc_enable_msr &
MSR_IA32_MISC_ENABLE_MWAIT);
}
+}
+
+static void kvm_update_cpuid(struct kvm_vcpu *vcpu)
+{
+ struct kvm_lapic *apic = vcpu->arch.apic;
+ struct kvm_cpuid_entry2 *best;
+
+ best = kvm_find_cpuid_entry(vcpu, 1, 0);
+ if (best && apic) {
+ if (cpuid_entry_has(best, X86_FEATURE_TSC_DEADLINE_TIMER))
+ apic->lapic_timer.timer_mode_mask = 3 << 17;
+ else
+ apic->lapic_timer.timer_mode_mask = 1 << 17;
+
+ kvm_apic_set_version(vcpu);
+ }
+
+ best = kvm_find_cpuid_entry(vcpu, 0xD, 0);
+ if (!best)
+ vcpu->arch.guest_supported_xcr0 = 0;
+ else
+ vcpu->arch.guest_supported_xcr0 =
+ (best->eax | ((u64)best->edx << 32)) & supported_xcr0;
/* Note, maxphyaddr must be updated before tdp_level. */
vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
@@ -221,6 +229,7 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
cpuid_fix_nx_cap(vcpu);
kvm_x86_ops.cpuid_update(vcpu);
+ kvm_update_cpuid_runtime(vcpu);
kvm_update_cpuid(vcpu);
kvfree(cpuid_entries);
@@ -249,6 +258,7 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
}
kvm_x86_ops.cpuid_update(vcpu);
+ kvm_update_cpuid_runtime(vcpu);
kvm_update_cpuid(vcpu);
out:
return r;
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index f136de1debad..3a923ae15f2f 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -9,7 +9,7 @@
extern u32 kvm_cpu_caps[NCAPINTS] __read_mostly;
void kvm_set_cpu_caps(void);
-void kvm_update_cpuid(struct kvm_vcpu *vcpu);
+void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu);
struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
u32 function, u32 index);
int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index e5dbb7ebae78..47801a44cfa6 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -2230,7 +2230,7 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
vcpu->arch.apic_base = value;
if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE)
- kvm_update_cpuid(vcpu);
+ kvm_update_cpuid_runtime(vcpu);
if (!apic)
return;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 7b987bccf0c8..e27d3db7e43f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -940,7 +940,7 @@ static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
vcpu->arch.xcr0 = xcr0;
if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND)
- kvm_update_cpuid(vcpu);
+ kvm_update_cpuid_runtime(vcpu);
return 0;
}
@@ -1004,7 +1004,7 @@ int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
kvm_mmu_reset_context(vcpu);
if ((cr4 ^ old_cr4) & (X86_CR4_OSXSAVE | X86_CR4_PKE))
- kvm_update_cpuid(vcpu);
+ kvm_update_cpuid_runtime(vcpu);
return 0;
}
@@ -2916,7 +2916,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (!guest_cpuid_has(vcpu, X86_FEATURE_XMM3))
return 1;
vcpu->arch.ia32_misc_enable_msr = data;
- kvm_update_cpuid(vcpu);
+ kvm_update_cpuid_runtime(vcpu);
} else {
vcpu->arch.ia32_misc_enable_msr = data;
}
@@ -8170,7 +8170,7 @@ static void enter_smm(struct kvm_vcpu *vcpu)
kvm_x86_ops.set_efer(vcpu, 0);
#endif
- kvm_update_cpuid(vcpu);
+ kvm_update_cpuid_runtime(vcpu);
kvm_mmu_reset_context(vcpu);
}
@@ -9192,7 +9192,7 @@ static int __set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
(X86_CR4_OSXSAVE | X86_CR4_PKE));
kvm_x86_ops.set_cr4(vcpu, sregs->cr4);
if (cpuid_update_needed)
- kvm_update_cpuid(vcpu);
+ kvm_update_cpuid_runtime(vcpu);
idx = srcu_read_lock(&vcpu->kvm->srcu);
if (is_pae_paging(vcpu)) {
--
2.18.4