From: Borislav Petkov <[email protected]> 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 <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Paolo Bonzini <[email protected]> Cc: Paul Gortmaker <[email protected]> Cc: "Peter Zijlstra (Intel)" <[email protected]> Cc: Thomas Gleixner <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
