[PATCH 3/5] x86/kvm: Convert some slow-path static_cpu_has() callers to boot_cpu_has()

Borislav Petkov
2019-03-30T11:20:29Z

From: Borislav Petkov <bp@suse.de>

Using static_cpu_has() is pointless on those paths, convert them to the
boot_cpu_has() variant.

No functional changes.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
---
arch/x86/kvm/svm.c | 10 +++++-----
arch/x86/kvm/vmx/vmx.c | 4 ++--
2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index b5b128a0a051..ecc6aba37b8f 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -835,7 +835,7 @@ static void svm_init_erratum_383(void)
int err;
u64 val;

- if (!static_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))
+ if (!boot_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))
return;

/* Use _safe variants to not break nested virtualization */
@@ -889,7 +889,7 @@ static int has_svm(void)
static void svm_hardware_disable(void)
{
/* Make sure we clean up behind us */
- if (static_cpu_has(X86_FEATURE_TSCRATEMSR))
+ if (boot_cpu_has(X86_FEATURE_TSCRATEMSR))
wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);

cpu_svm_disable();
@@ -931,7 +931,7 @@ static int svm_hardware_enable(void)

wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT);

- if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
+ if (boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
__this_cpu_write(current_tsc_ratio, TSC_RATIO_DEFAULT);
}
@@ -2252,7 +2252,7 @@ static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);

- if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
+ if (boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
u64 tsc_ratio = vcpu->arch.tsc_scaling_ratio;
if (tsc_ratio != __this_cpu_read(current_tsc_ratio)) {
__this_cpu_write(current_tsc_ratio, tsc_ratio);
@@ -2260,7 +2260,7 @@ static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
}
}
/* This assumes that the kernel never uses MSR_TSC_AUX */
- if (static_cpu_has(X86_FEATURE_RDTSCP))
+ if (boot_cpu_has(X86_FEATURE_RDTSCP))
wrmsrl(MSR_TSC_AUX, svm->tsc_aux);

if (sd->current_vmcb != svm->vmcb) {
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index c73375e01ab8..0cb0d26564ca 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6423,7 +6423,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
vmx_set_interrupt_shadow(vcpu, 0);

- if (static_cpu_has(X86_FEATURE_PKU) &&
+ if (boot_cpu_has(X86_FEATURE_PKU) &&
kvm_read_cr4_bits(vcpu, X86_CR4_PKE) &&
vcpu->arch.pkru != vmx->host_pkru)
__write_pkru(vcpu->arch.pkru);
@@ -6512,7 +6512,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
* back on host, so it is safe to read guest PKRU from current
* XSAVE.
*/
- if (static_cpu_has(X86_FEATURE_PKU) &&
+ if (boot_cpu_has(X86_FEATURE_PKU) &&
kvm_read_cr4_bits(vcpu, X86_CR4_PKE)) {
vcpu->arch.pkru = __read_pkru();
if (vcpu->arch.pkru != vmx->host_pkru)
--
2.21.0