From: Paolo Bonzini <pbonzini@redhat.com>
To: Rhett Rhett <rhett.kernel@gmail.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>,
tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] KVM:Hyper-V reduce one kvm_write_guest operation
Date: Wed, 20 Dec 2017 10:45:02 +0100 [thread overview]
Message-ID: <2ee6e3c6-f1c1-a5e4-a2ca-934f3414f3a9@redhat.com> (raw)
In-Reply-To: <CABvbLL00cQP4Xbgz7T-4WqRu6Ar8dWBLtuTqgvadeaahsUMowg@mail.gmail.com>
On 20/12/2017 10:33, Rhett Rhett wrote:
> tsc_sequence had been set to 0 before, so the tsc page won't function.
> guest has no chance to read tsc page before the last write.
>
kvm_write_guest is not atomic. The guest can see a non-zero sequence
before the other fields have been set.
Paolo
prev parent reply other threads:[~2017-12-20 9:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <d1e55d03-1a21-e42b-8d10-af55e67eb567@gmail.com>
2017-12-20 9:01 ` Paolo Bonzini
[not found] ` <CABvbLL00cQP4Xbgz7T-4WqRu6Ar8dWBLtuTqgvadeaahsUMowg@mail.gmail.com>
2017-12-20 9:45 ` Paolo Bonzini [this message]
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