diff options
| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2018-06-01 17:59:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-14 20:19:33 +0300 |
| commit | c2185a44e742c82a6975ff1c96f8e95053658ca8 (patch) | |
| tree | b01f41a4ca502b58976664f7ac9bb7cc76bf7e5a | |
| parent | 9ad055877c939e4d8661ede9e2aa1cc3691cef89 (diff) | |
| download | linux-c2185a44e742c82a6975ff1c96f8e95053658ca8.tar.xz | |
x86/bugs: Switch the selection of mitigation from CPU vendor to CPU features
commit 108fab4b5c8f12064ef86e02cb0459992affb30f upstream.
Both AMD and Intel can have SPEC_CTRL_MSR for SSBD.
However AMD also has two more other ways of doing it - which
are !SPEC_CTRL MSR ways.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: kvm@vger.kernel.org
Cc: KarimAllah Ahmed <karahmed@amazon.de>
Cc: andrew.cooper3@citrix.com
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lkml.kernel.org/r/20180601145921.9500-4-konrad.wilk@oracle.com
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index b1146405ce8a..878832580f7f 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -534,17 +534,12 @@ static enum ssb_mitigation __init __ssb_select_mitigation(void) * Intel uses the SPEC CTRL MSR Bit(2) for this, while AMD may * use a completely different MSR and bit dependent on family. */ - switch (boot_cpu_data.x86_vendor) { - case X86_VENDOR_INTEL: - case X86_VENDOR_AMD: - if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) { - x86_amd_ssb_disable(); - break; - } + if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) + x86_amd_ssb_disable(); + else { x86_spec_ctrl_base |= SPEC_CTRL_SSBD; x86_spec_ctrl_mask |= SPEC_CTRL_SSBD; wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); - break; } } |