2015-11-12 19:12 GMT+08:00 Paolo Bonzini <pbonzini@xxxxxxxxxx>: > > Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> > --- > lib/x86/processor.h | 16 ++++++++++++++++ > x86/tsc.c | 23 +++++++++++++++++++++++ > x86/unittests.cfg | 1 + > 3 files changed, 40 insertions(+) > > diff --git a/lib/x86/processor.h b/lib/x86/processor.h > index 7973879..b9cb753 100644 > --- a/lib/x86/processor.h > +++ b/lib/x86/processor.h > @@ -2,6 +2,7 @@ > #define LIBCFLAT_PROCESSOR_H > > #include "libcflat.h" > +#include "msr.h" > #include <stdint.h> > > #ifdef __x86_64__ > @@ -340,6 +341,21 @@ static inline unsigned long long rdtsc() > return r; > } > > +static inline unsigned long long rdtscp(u32 *aux) > +{ > + long long r; > + > +#ifdef __x86_64__ > + unsigned a, d; > + > + asm volatile ("rdtscp" : "=a"(a), "=d"(d), "=c"(*aux)); > + r = a | ((long long)d << 32); > +#else > + asm volatile ("rdtscp" : "=A"(r), "=c"(*aux)); > +#endif > + return r; > +} > + > static inline void wrtsc(u64 tsc) > { > unsigned a = tsc, d = tsc >> 32; > diff --git a/x86/tsc.c b/x86/tsc.c > index 58f332d..c71dc2a 100644 > --- a/x86/tsc.c > +++ b/x86/tsc.c > @@ -1,6 +1,13 @@ > #include "libcflat.h" > #include "processor.h" > > +#define CPUID_80000001_EDX_RDTSCP (1 << 27) > +int check_cpuid_80000001_edx(unsigned int bit) > +{ > + return (cpuid(0x80000001).d & bit) != 0; > +} > + > + > void test_wrtsc(u64 t1) > { > u64 t2; > @@ -10,6 +17,15 @@ void test_wrtsc(u64 t1) > printf("rdtsc after wrtsc(%lld): %lld\n", t1, t2); > } > > +void test_rdtscp(u64 aux) > +{ > + u32 ecx; > + > + wrmsr(MSR_TSC_AUX, aux); > + rdtscp(&ecx); > + report("Test RDTSCP %d", ecx == aux, aux); > +} > + > int main() > { > u64 t1, t2; > @@ -20,5 +36,12 @@ int main() > > test_wrtsc(0); > test_wrtsc(100000000000ull); > + > + if (check_cpuid_80000001_edx(CPUID_80000001_EDX_RDTSCP)) { > + test_rdtscp(0); > + test_rdtscp(10); > + test_rdtscp(0x100); > + } else > + printf("rdtscp not supported\n"); > return 0; > } > diff --git a/x86/unittests.cfg b/x86/unittests.cfg > index ac652fc..fd7e9b2 100644 > --- a/x86/unittests.cfg > +++ b/x86/unittests.cfg > @@ -114,6 +114,7 @@ file = sieve.flat > > [tsc] > file = tsc.flat > +extra_params = -cpu kvm64,+rdtscp > > [tsc_adjust] > file = tsc_adjust.flat When I run cpuid tool in a real linux guest, the rdtscp, tsc_adjust, tsc deadline timer are present, however, kvm-unit-tests always report these features are not detected, what is the issue here? Regards, Wanpeng Li -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html