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KVM: VMX: Add proper cache tracking for CR0

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Move CR0 caching into the standard register caching mechanism in order
to take advantage of the availability checks provided by regs_avail.
This avoids multiple VMREADs in the (uncommon) case where kvm_read_cr0()
is called multiple times in a single VM-Exit, and more importantly
eliminates a kvm_x86_ops hook, saves a retpoline on SVM when reading
CR0, and squashes the confusing naming discrepancy of "cache_reg" vs.
"decache_cr0_guest_bits".

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200502043234.12481-8-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2020-05-01 21:32:31 -07:00
committed by Paolo Bonzini
parent f98c1e7712
commit bd31fe495d
5 changed files with 12 additions and 17 deletions
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2
arch/x86/include/asm/kvm_host.h
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@@ -167,6 +167,7 @@ enum kvm_reg {
NR_VCPU_REGS,
VCPU_EXREG_PDPTR = NR_VCPU_REGS,
VCPU_EXREG_CR0,
VCPU_EXREG_CR3,
VCPU_EXREG_CR4,
VCPU_EXREG_RFLAGS,
@@ -1092,7 +1093,6 @@ struct kvm_x86_ops {
void (*set_segment)(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg);
void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
void (*decache_cr0_guest_bits)(struct kvm_vcpu *vcpu);
void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
int (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);