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>

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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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5

arch/x86/kvm/kvm_cache_regs.h

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5

arch/x86/kvm/svm/svm.c

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16

arch/x86/kvm/vmx/vmx.c

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1

arch/x86/kvm/vmx/vmx.h

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