From: Borislav Petkov <b...@suse.de>
This keeps poking at MSR 0x570 when loading, i.e. MSR_IA32_RTIT_CTL,
which is most likely not present on other vendors. It is using the _safe
variant but there's no need to try it at all, really. Besides, it causes
unhandled rdmsr warnings when booting in a guest:
kvm [4414]: vcpu0 unhandled rdmsr: 0x570
So check CPU vendor before doing anything else.
Signed-off-by: Borislav Petkov <b...@suse.de>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <a...@kernel.org>
Cc: "H. Peter Anvin" <h...@zytor.com>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Paul Gortmaker <paul.gortma...@windriver.com>
Cc: "Peter Zijlstra (Intel)" <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
---
arch/x86/kernel/cpu/perf_event_intel_pt.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_pt.c
b/arch/x86/kernel/cpu/perf_event_intel_pt.c
index 42169283448b..fa1262b025e7 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_pt.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_pt.c
@@ -1129,6 +1129,9 @@ static __init int pt_init(void)
{
int ret, cpu, prior_warn = 0;
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+ return 0;
+
BUILD_BUG_ON(sizeof(struct topa) > PAGE_SIZE);
get_online_cpus();
for_each_online_cpu(cpu) {
--
2.3.5
--
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