linux-kernel - Re: [PATCH] kvm: kvmclock: let KVM_GET_CLOCK return whether the master clock is in use

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Message-ID: <20161119193433.GG26213@potion>
Date:   Sat, 19 Nov 2016 20:34:34 +0100
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH] kvm: kvmclock: let KVM_GET_CLOCK return whether the
 master clock is in use

2016-11-09 17:48+0100, Paolo Bonzini:
> Userspace can read the exact value of kvmclock by reading the TSC
> and fetching the timekeeping parameters out of guest memory.  This
> however is brittle and not necessary anymore with KVM 4.11.  Provide
> a mechanism that lets userspace know if the new KVM_GET_CLOCK
> semantics are in effect, and---since we are at it---if the clock
> is stable across all VCPUs.
> 
> Cc: Radim Krčmář <rkrcmar@...hat.com>
> Cc: Marcelo Tosatti <mtosatti@...hat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Applied to kvm/master, thanks.