From: Daniel Sneddon Date: Wed, 13 Mar 2024 16:49:17 +0000 (-0700) Subject: KVM: x86: Add BHI_NO X-Git-Tag: v6.9-rc4-pxa1908~67^2 X-Git-Url: https://git.dujemihanovic.xyz/?a=commitdiff_plain;h=ed2e8d49b54d677f3123668a21a57822d679651f;p=linux.git KVM: x86: Add BHI_NO Intel processors that aren't vulnerable to BHI will set MSR_IA32_ARCH_CAPABILITIES[BHI_NO] = 1;. Guests may use this BHI_NO bit to determine if they need to implement BHI mitigations or not. Allow this bit to be passed to the guests. Signed-off-by: Daniel Sneddon Signed-off-by: Pawan Gupta Signed-off-by: Daniel Sneddon Signed-off-by: Thomas Gleixner Reviewed-by: Alexandre Chartre Reviewed-by: Josh Poimboeuf --- diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 47d9f03b7778..984ea2089efc 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1621,7 +1621,7 @@ static bool kvm_is_immutable_feature_msr(u32 msr) ARCH_CAP_PSCHANGE_MC_NO | ARCH_CAP_TSX_CTRL_MSR | ARCH_CAP_TAA_NO | \ ARCH_CAP_SBDR_SSDP_NO | ARCH_CAP_FBSDP_NO | ARCH_CAP_PSDP_NO | \ ARCH_CAP_FB_CLEAR | ARCH_CAP_RRSBA | ARCH_CAP_PBRSB_NO | ARCH_CAP_GDS_NO | \ - ARCH_CAP_RFDS_NO | ARCH_CAP_RFDS_CLEAR) + ARCH_CAP_RFDS_NO | ARCH_CAP_RFDS_CLEAR | ARCH_CAP_BHI_NO) static u64 kvm_get_arch_capabilities(void) {