[PATCH 4/6] KVM: X86: Split kvm_update_cpuid()

Xiaoyao Li
2020-05-29T08:56:04Z

Split the part of updating KVM states from kvm_update_cpuid(), and put
it into a new kvm_update_state_based_on_cpuid(). So it's clear that
kvm_update_cpuid() is to update guest CPUID settings, while
kvm_update_state_based_on_cpuid() is to update KVM states based on the
updated CPUID settings.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
arch/x86/kvm/cpuid.c | 38 ++++++++++++++++++++++++--------------
arch/x86/kvm/cpuid.h | 1 +
arch/x86/kvm/x86.c | 1 +
3 files changed, 26 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index c8cb373056f1..a4a2072f5253 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -76,7 +76,6 @@ static int kvm_check_cpuid(struct kvm_vcpu *vcpu)
void kvm_update_cpuid(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) {
@@ -87,13 +86,6 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu)

cpuid_entry_change(best, X86_FEATURE_APIC,
vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE);
-
- if (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;
- }
}

best = kvm_find_cpuid_entry(vcpu, 7, 0);
@@ -102,13 +94,8 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu)
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) ||
@@ -127,6 +114,27 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu)
vcpu->arch.ia32_misc_enable_msr &
MSR_IA32_MISC_ENABLE_MWAIT);
}
+}
+
+void kvm_update_state_based_on_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;
+ }
+
+ 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,
kvm_apic_set_version(vcpu);
kvm_x86_ops.cpuid_update(vcpu);
kvm_update_cpuid(vcpu);
+ kvm_update_state_based_on_cpuid(vcpu);

out:
vfree(cpuid_entries);
@@ -250,6 +259,7 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
kvm_apic_set_version(vcpu);
kvm_x86_ops.cpuid_update(vcpu);
kvm_update_cpuid(vcpu);
+ kvm_update_state_based_on_cpuid(vcpu);
out:
return r;
}
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index f136de1debad..0ccf9ec4bf55 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -10,6 +10,7 @@ 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_state_based_on_cpuid(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/x86.c b/arch/x86/kvm/x86.c
index dc993b79ae2f..fcb85432d30b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8100,6 +8100,7 @@ static void enter_smm(struct kvm_vcpu *vcpu)
#endif

kvm_update_cpuid(vcpu);
+ kvm_update_state_based_on_cpuid(vcpu);
kvm_mmu_reset_context(vcpu);
}

--
2.18.2