From: Tom Lendacky thomas.lendacky@amd.com
commit a006483b2f97af685f0e60f3a547c9ad4c9b9e94 upstream.
If the SME and SEV features are present via CPUID, but memory encryption support is not enabled (MSR 0xC001_0010[23]), the feature flags are cleared using clear_cpu_cap(). However, if get_cpu_cap() is later called, these feature flags will be reset back to present, which is not desired.
Change from using clear_cpu_cap() to setup_clear_cpu_cap() so that the clearing of the flags is maintained.
Signed-off-by: Tom Lendacky thomas.lendacky@amd.com Signed-off-by: Borislav Petkov bp@suse.de Cc: stable@vger.kernel.org # 4.16.x- Link: https://lkml.kernel.org/r/226de90a703c3c0be5a49565047905ac4e94e8f3.157912591... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- arch/x86/kernel/cpu/amd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index f86f912..75715fa 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -609,9 +609,9 @@ static void early_detect_mem_encrypt(struct cpuinfo_x86 *c) return;
clear_all: - clear_cpu_cap(c, X86_FEATURE_SME); + setup_clear_cpu_cap(X86_FEATURE_SME); clear_sev: - clear_cpu_cap(c, X86_FEATURE_SEV); + setup_clear_cpu_cap(X86_FEATURE_SEV); } }