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authorXiao Guangrong <guangrong.xiao@intel.com>2015-07-16 03:25:56 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2015-07-23 08:23:01 +0200
commitfb279950ba02e3210a16b11ecfa8871f3ee0ca49 (patch)
tree6dbc46398f73292a737426a37796f0a8bbc2ef85 /arch
parent41dbc6bcd9722bba8f09256655d060af30c63d34 (diff)
downloadlinux-fb279950ba02e3210a16b11ecfa8871f3ee0ca49.tar.bz2
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')
-rw-r--r--arch/x86/kvm/vmx.c5
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;
}