This is a note to let you know that I've just added the patch titled
KVM: x86: Mask off reserved bits in CPUID.80000001H
to the 5.15-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-mask-off-reserved-bits-in-cpuid.80000001h.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0469e56a14bf8cfb80507e51b7aeec0332cdbc13 Mon Sep 17 00:00:00 2001
From: Jim Mattson <jmattson@xxxxxxxxxx>
Date: Fri, 30 Sep 2022 00:51:58 +0200
Subject: KVM: x86: Mask off reserved bits in CPUID.80000001H
From: Jim Mattson <jmattson@xxxxxxxxxx>
commit 0469e56a14bf8cfb80507e51b7aeec0332cdbc13 upstream.
KVM_GET_SUPPORTED_CPUID should only enumerate features that KVM
actually supports. CPUID.80000001:EBX[27:16] are reserved bits and
should be masked off.
Fixes: 0771671749b5 ("KVM: Enhance guest cpuid management")
Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/cpuid.c | 1 +
1 file changed, 1 insertion(+)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -902,6 +902,7 @@ static inline int __do_cpuid_func(struct
entry->eax = min(entry->eax, 0x8000001f);
break;
case 0x80000001:
+ entry->ebx &= ~GENMASK(27, 16);
cpuid_entry_override(entry, CPUID_8000_0001_EDX);
cpuid_entry_override(entry, CPUID_8000_0001_ECX);
break;
Patches currently in stable-queue which might be from jmattson@xxxxxxxxxx are
queue-5.15/kvm-x86-mask-off-reserved-bits-in-cpuid.80000008h.patch
queue-5.15/kvm-x86-mask-off-reserved-bits-in-cpuid.80000006h.patch
queue-5.15/kvm-x86-mask-off-reserved-bits-in-cpuid.80000001h.patch
queue-5.15/kvm-x86-mask-off-reserved-bits-in-cpuid.8000001ah.patch
queue-5.15/kvm-x86-mask-off-reserved-bits-in-cpuid.8000001fh.patch
