This is a note to let you know that I've just added the patch titled
KVM: x86: Add BHI_NO
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-x86-add-bhi_no.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0d6146ebca0edd0bceb23adcf688ac8e740347e3 Mon Sep 17 00:00:00 2001
From: Daniel Sneddon <daniel.sneddon@xxxxxxxxxxxxxxx>
Date: Wed, 13 Mar 2024 09:49:17 -0700
Subject: KVM: x86: Add BHI_NO
From: Daniel Sneddon <daniel.sneddon@xxxxxxxxxxxxxxx>
commit ed2e8d49b54d677f3123668a21a57822d679651f upstream.
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 <daniel.sneddon@xxxxxxxxxxxxxxx>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>
Signed-off-by: Daniel Sneddon <daniel.sneddon@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Alexandre Chartre <alexandre.chartre@xxxxxxxxxx>
Reviewed-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Daniel Sneddon <daniel.sneddon@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/x86.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1624,7 +1624,7 @@ static bool kvm_is_immutable_feature_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)
{
Patches currently in stable-queue which might be from daniel.sneddon@xxxxxxxxxxxxxxx are
queue-6.8/x86-bhi-define-spec_ctrl_bhi_dis_s.patch
queue-6.8/x86-bhi-add-support-for-clearing-branch-history-at-syscall-entry.patch
queue-6.8/x86-bhi-mitigate-kvm-by-default.patch
queue-6.8/x86-bhi-enumerate-branch-history-injection-bhi-bug.patch
queue-6.8/x86-syscall-don-t-force-use-of-indirect-calls-for-system-calls.patch
queue-6.8/x86-bugs-change-commas-to-semicolons-in-spectre_v2-sysfs-file.patch
queue-6.8/x86-bhi-add-bhi-mitigation-knob.patch
queue-6.8/kvm-x86-add-bhi_no.patch
