KVM: VMX: Add proper cache tracking for CR4

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Move CR4 caching into the standard register caching mechanism in order
to take advantage of the availability checks provided by regs_avail.
This avoids multiple VMREADs and retpolines (when configured) during
nested VMX transitions as kvm_read_cr4_bits() is invoked multiple times
on each transition, e.g. when stuffing CR0 and CR3.

As an added bonus, this eliminates a kvm_x86_ops hook, saves a retpoline
on SVM when reading CR4, and squashes the confusing naming discrepancy
of "cache_reg" vs. "decache_cr4_guest_bits".

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200502043234.12481-7-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 21:32:30 -07:00 • committed by Paolo Bonzini

parent 0cc69204e7

commit f98c1e7712

5 changed files with 14 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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18

arch/x86/kvm/vmx/vmx.c

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1

arch/x86/kvm/vmx/vmx.h

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