From: Jim Mattson Date: Fri, 11 Oct 2024 21:43:52 +0000 (-0700) Subject: KVM: x86: Advertise AMD_IBPB_RET to userspace X-Git-Tag: v6.13-rc1~13^2~13^2~28 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=71dd5d5300d228fbfd816a620250a62bfacdd902;p=linux-block.git KVM: x86: Advertise AMD_IBPB_RET to userspace This is an inherent feature of IA32_PRED_CMD[0], so it is trivially virtualizable (as long as IA32_PRED_CMD[0] is virtualized). Suggested-by: Tom Lendacky Signed-off-by: Jim Mattson Reviewed-by: Tom Lendacky Reviewed-by: Thomas Gleixner Link: https://lore.kernel.org/r/20241011214353.1625057-4-jmattson@google.com Signed-off-by: Sean Christopherson --- diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 41786b834b16..53112669be00 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -755,7 +755,7 @@ void kvm_set_cpu_caps(void) F(CLZERO) | F(XSAVEERPTR) | F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) | F(AMD_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON) | - F(AMD_PSFD) + F(AMD_PSFD) | F(AMD_IBPB_RET) ); /*