Commit 61aa9a0a authored Aug 25, 2020 by Cathy Zhang Committed by Borislav Petkov Aug 30, 2020

x86/kvm: Expose TSX Suspend Load Tracking feature



TSX suspend load tracking instruction is supported by the Intel uarch
Sapphire Rapids. It aims to give a way to choose which memory accesses
do not need to be tracked in the TSX read set. It's availability is
indicated as CPUID.(EAX=7,ECX=0):EDX[bit 16].

Expose TSX Suspend Load Address Tracking feature in KVM CPUID, so KVM
could pass this information to guests and they can make use of this
feature accordingly.

Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/1598316478-23337-3-git-send-email-cathy.zhang@intel.com

parent 18ec63fa

arch/x86/kvm/cpuid.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -371,7 +371,7 @@ void kvm_set_cpu_caps(void)
		F(AVX512_4VNNIW) \| F(AVX512_4FMAPS) \| F(SPEC_CTRL) \|
		F(SPEC_CTRL_SSBD) \| F(ARCH_CAPABILITIES) \| F(INTEL_STIBP) \|
		F(MD_CLEAR) \| F(AVX512_VP2INTERSECT) \| F(FSRM) \|
		F(SERIALIZE)
		F(SERIALIZE) \| F(TSXLDTRK)
		);

		/* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */

Admin message