linux-kernel - [tip: x86/cpu] x86/kvm: Expose TSX Suspend Load Tracking feature

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Message-ID: <159881641103.20229.17685673567805540731.tip-bot2@tip-bot2>
Date:   Sun, 30 Aug 2020 19:40:11 -0000
From:   "tip-bot2 for Cathy Zhang" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Cathy Zhang <cathy.zhang@...el.com>, Borislav Petkov <bp@...e.de>,
        Tony Luck <tony.luck@...el.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/cpu] x86/kvm: Expose TSX Suspend Load Tracking feature

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID:     61aa9a0a5eae2100c171698bffabde8d5e9f694d
Gitweb:        https://git.kernel.org/tip/61aa9a0a5eae2100c171698bffabde8d5e9f694d
Author:        Cathy Zhang <cathy.zhang@...el.com>
AuthorDate:    Tue, 25 Aug 2020 08:47:58 +08:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Sun, 30 Aug 2020 21:34:10 +02:00

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@...el.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Link: https://lkml.kernel.org/r/1598316478-23337-3-git-send-email-cathy.zhang@intel.com
---
 arch/x86/kvm/cpuid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 3fd6eec..7456f9a 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -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. */