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| author | Zachary Amsden <zamsden@gmail.com> | 2012-02-03 15:43:57 -0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-03-08 14:10:09 +0200 |
| commit | e26101b116a6235bcd80b3a4c38c9fe91286cd79 (patch) | |
| tree | 82c133ffb2c8877f675af519a2ffd4c55820c7e9 /arch/x86/include/asm/kvm_host.h | |
| parent | 0dd6a6edb0124e6c71931ff575b18e15ed6e8603 (diff) | |
| download | lwn-e26101b116a6235bcd80b3a4c38c9fe91286cd79.tar.gz lwn-e26101b116a6235bcd80b3a4c38c9fe91286cd79.zip | |
KVM: Track TSC synchronization in generations
This allows us to track the original nanosecond and counter values
at each phase of TSC writing by the guest. This gets us perfect
offset matching for stable TSC systems, and perfect software
computed TSC matching for machines with unstable TSC.
Signed-off-by: Zachary Amsden <zamsden@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/kvm_host.h')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 4fbeb84b1818..c24125cd0c63 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -420,10 +420,11 @@ struct kvm_vcpu_arch { u64 last_guest_tsc; u64 last_kernel_ns; - u64 last_tsc_nsec; - u64 last_tsc_write; u64 last_host_tsc; u64 tsc_offset_adjustment; + u64 this_tsc_nsec; + u64 this_tsc_write; + u8 this_tsc_generation; bool tsc_catchup; bool tsc_always_catchup; s8 virtual_tsc_shift; @@ -513,9 +514,12 @@ struct kvm_arch { s64 kvmclock_offset; raw_spinlock_t tsc_write_lock; u64 last_tsc_nsec; - u64 last_tsc_offset; u64 last_tsc_write; u32 last_tsc_khz; + u64 cur_tsc_nsec; + u64 cur_tsc_write; + u64 cur_tsc_offset; + u8 cur_tsc_generation; struct kvm_xen_hvm_config xen_hvm_config; |