On 05/03/2010 06:52 PM, Glauber Costa wrote:
If the HV told us we can fully trust the TSC, skip any correction
Signed-off-by: Glauber Costa<glom...@redhat.com> --- arch/x86/include/asm/kvm_para.h | 5 +++++ arch/x86/include/asm/pvclock-abi.h | 1 + arch/x86/kernel/kvmclock.c | 3 +++ arch/x86/kernel/pvclock.c | 4 ++++ 4 files changed, 13 insertions(+), 0 deletions(-) diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h index f019f8c..6f1b878 100644 --- a/arch/x86/include/asm/kvm_para.h +++ b/arch/x86/include/asm/kvm_para.h @@ -21,6 +21,11 @@ */ #define KVM_FEATURE_CLOCKSOURCE2 3 +/* The last 8 bits are used to indicate how to interpret the flags field + * in pvclock structure. If no bits are set, all flags are ignored. + */ +#define KVM_FEATURE_CLOCKSOURCE_STABLE_TSC 24
This needs documentation (in cpuid.txt). The flag doesn't mean the TSC is stable, rather it means the pvclock tsc stable bit is valid.
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