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| author | Xiao Guangrong <guangrong.xiao@intel.com> | 2015-07-16 03:25:56 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-07-23 08:23:01 +0200 |
| commit | fb279950ba02e3210a16b11ecfa8871f3ee0ca49 (patch) | |
| tree | 6dbc46398f73292a737426a37796f0a8bbc2ef85 /arch/x86/kvm | |
| parent | 41dbc6bcd9722bba8f09256655d060af30c63d34 (diff) | |
| download | lwn-fb279950ba02e3210a16b11ecfa8871f3ee0ca49.tar.gz lwn-fb279950ba02e3210a16b11ecfa8871f3ee0ca49.zip | |
KVM: vmx: obey KVM_QUIRK_CD_NW_CLEARED
OVMF depends on WB to boot fast, because it only clears caches after
it has set up MTRRs---which is too late.
Let's do writeback if CR0.CD is set to make it happy, similar to what
SVM is already doing.
Signed-off-by: Xiao Guangrong <guangrong.xiao@intel.com>
Tested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 5b4e9384717a..e9e1fc517ab5 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -8650,7 +8650,10 @@ static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) if (kvm_read_cr0(vcpu) & X86_CR0_CD) { ipat = VMX_EPT_IPAT_BIT; - cache = MTRR_TYPE_UNCACHABLE; + if (kvm_check_has_quirk(vcpu->kvm, KVM_QUIRK_CD_NW_CLEARED)) + cache = MTRR_TYPE_WRBACK; + else + cache = MTRR_TYPE_UNCACHABLE; goto exit; } |