diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-01 14:21:03 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-20 09:26:15 +0200 |
| commit | 108b249c453dd7132599ab6dc7e435a7036c193f (patch) | |
| tree | eb600c0558d7032bc1b0c62066f74ac109bd4fd7 /arch/x86/kvm/x86.h | |
| parent | KVM: x86: initialize kvmclock_offset (diff) | |
| download | linux-108b249c453dd7132599ab6dc7e435a7036c193f.tar.xz linux-108b249c453dd7132599ab6dc7e435a7036c193f.zip | |
KVM: x86: introduce get_kvmclock_ns
Introduce a function that reads the exact nanoseconds value that is
provided to the guest in kvmclock. This crystallizes the notion of
kvmclock as a thin veneer over a stable TSC, that the guest will
(hopefully) convert with NTP. In other words, kvmclock is *not* a
paravirtualized host-to-guest NTP.
Drop the get_kernel_ns() function, that was used both to get the base
value of the master clock and to get the current value of kvmclock.
The former use is replaced by ktime_get_boot_ns(), the latter is
the purpose of get_kernel_ns().
This also allows KVM to provide a Hyper-V time reference counter that
is synchronized with the time that is computed from the TSC page.
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.h')
| -rw-r--r-- | arch/x86/kvm/x86.h | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index a82ca466b62e..e8ff3e4ce38a 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -148,11 +148,6 @@ static inline void kvm_register_writel(struct kvm_vcpu *vcpu, return kvm_register_write(vcpu, reg, val); } -static inline u64 get_kernel_ns(void) -{ - return ktime_get_boot_ns(); -} - static inline bool kvm_check_has_quirk(struct kvm *kvm, u64 quirk) { return !(kvm->arch.disabled_quirks & quirk); @@ -164,6 +159,7 @@ void kvm_set_pending_timer(struct kvm_vcpu *vcpu); int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip); void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr); +u64 get_kvmclock_ns(struct kvm *kvm); int kvm_read_guest_virt(struct x86_emulate_ctxt *ctxt, gva_t addr, void *val, unsigned int bytes, |