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Message-Id: <20180521215449.26423-1-konrad.wilk@oracle.com>
Date: Mon, 21 May 2018 17:54:48 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Fix SSBD not being exposed to guests. (v1)
Hi,
Without this patch, when launching QEMU with -cpu +ssbd I ended up
with a warning seeing that the CPU does not support - which in fact it does.
The issue was the X86_FEATURE_ - the kvm_cpuid_7_0_edx_x86_features
had bit 17 set (X86_FEATURE_SSBD), while the right bit should have been
bit 31 ( X86_FEATURE_SPEC_CTRL_SSBD). That meant the masking:
entry->edx &= kvm_cpuid_7_0_edx_x86_features;
would nicely clear the SSBD bit.
This fixes:
Fixes: 52817587e706 ("x86/cpufeatures: Disentangle SSBD enumeration")
arch/x86/kvm/cpuid.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
Konrad Rzeszutek Wilk (1):
KVM: VMX: Expose SSBD properly to guests.
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