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From: <gregkh@linuxfoundation.org>
To: jmattson@google.com, pbonzini@redhat.com
Cc: <stable@vger.kernel.org>
Subject: FAILED: patch "[PATCH] KVM: x86: Mask off reserved bits in CPUID.8000001AH" failed to apply to 4.14-stable tree
Date: Mon, 07 Nov 2022 17:47:36 +0100	[thread overview]
Message-ID: <1667839656176141@kroah.com> (raw)


The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Possible dependencies:

079f6889818d ("KVM: x86: Mask off reserved bits in CPUID.8000001AH")
382409b4c43e ("kvm: x86: Include CPUID leaf 0x8000001e in kvm's supported CPUID")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 079f6889818dd07903fb36c252532ab47ebb6d48 Mon Sep 17 00:00:00 2001
From: Jim Mattson <jmattson@google.com>
Date: Thu, 29 Sep 2022 15:52:01 -0700
Subject: [PATCH] KVM: x86: Mask off reserved bits in CPUID.8000001AH

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@google.com>
Message-Id: <20220929225203.2234702-4-jmattson@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 489c028859e1..a0292ba650df 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -1189,6 +1189,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 		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:


                 reply	other threads:[~2022-11-07 16:47 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

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