Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]


Groups > linux.kernel > #1523722

Re: [PATCH v3] KVM: x86: do not go through vcpu in __get_kvmclock_ns

From Radim Krčmář <rkrcmar@redhat.com>
Newsgroups linux.kernel
Subject Re: [PATCH v3] KVM: x86: do not go through vcpu in __get_kvmclock_ns
Date 2016-11-16 19:20 +0100
Message-ID <sEcYp-6si-27@gated-at.bofh.it> (permalink)
References <sEclH-5WJ-21@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw


2016-11-16 18:31+0100, Paolo Bonzini:
> Going through the first VCPU is wrong if you follow a KVM_SET_CLOCK with
> a KVM_GET_CLOCK immediately after, without letting the VCPU run and
> call kvm_guest_time_update.
> 
> To fix this, compute the kvmclock value ourselves, using the master
> clock (tsc, nsec) pair as the base and the host CPU frequency as
> the scale.
> 
> Reported-by: Marcelo Tosatti <mtosatti@redhat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---

Looks good, thanks!  Planned for 4.9-rc6.

Back to linux.kernel | Previous | NextPrevious in thread | Next in thread | Find similar | Unroll thread


Thread

[PATCH v3] KVM: x86: do not go through vcpu in __get_kvmclock_ns Paolo Bonzini <pbonzini@redhat.com> - 2016-11-16 18:40 +0100
  Re: [PATCH v3] KVM: x86: do not go through vcpu in __get_kvmclock_ns Radim Krčmář <rkrcmar@redhat.com> - 2016-11-16 19:20 +0100
  Re: [PATCH v3] KVM: x86: do not go through vcpu in __get_kvmclock_ns Marcelo Tosatti <mtosatti@redhat.com> - 2016-11-17 12:50 +0100
    Re: [PATCH v3] KVM: x86: do not go through vcpu in __get_kvmclock_ns Paolo Bonzini <pbonzini@redhat.com> - 2016-11-17 18:10 +0100

csiph-web