This is a note to let you know that I've just added the patch titled
KVM: x86: Mask off reserved bits in CPUID.8000001AH
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.8000001ah.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 079f6889818dd07903fb36c252532ab47ebb6d48 Mon Sep 17 00:00:00 2001
From: Jim Mattson <jmattson@xxxxxxxxxx>
Date: Thu, 29 Sep 2022 15:52:01 -0700
Subject: KVM: x86: Mask off reserved bits in CPUID.8000001AH
From: Jim Mattson <jmattson@xxxxxxxxxx>
commit 079f6889818dd07903fb36c252532ab47ebb6d48 upstream.
KVM_GET_SUPPORTED_CPUID should only enumerate features that KVM
actually supports. In the case of CPUID.8000001AH, only three bits are
currently defined. The 125 reserved bits should be masked off.
Fixes: 24c82e576b78 ("KVM: Sanitize cpuid")
Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>
Message-Id: <20220929225203.2234702-4-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 | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -956,6 +956,9 @@ static inline int __do_cpuid_func(struct
entry->ecx = entry->edx = 0;
break;
case 0x8000001a:
+ entry->eax &= GENMASK(2, 0);
+ entry->ebx = entry->ecx = entry->edx = 0;
+ break;
case 0x8000001e:
break;
case 0x8000001F:
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
