From: Marcelo Tosatti <mtosatti@redhat.com>
To: Boris Ostrovsky <ostr@amd64.org>
Cc: avi@redhat.com, Joerg.Roedel@amd.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, boris.ostrovsky@amd.com
Subject: Re: [PATCH v2.1] KVM: SVM: Add support for AMD's OSVW feature in guests
Date: Mon, 9 Jan 2012 10:14:09 -0200 [thread overview]
Message-ID: <20120109121409.GE5255@amt.cnet> (raw)
In-Reply-To: <1325866436-22553-1-git-send-email-ostr@amd64.org>
On Fri, Jan 06, 2012 at 11:13:56AM -0500, Boris Ostrovsky wrote:
> From: Boris Ostrovsky <boris.ostrovsky@amd.com>
>
> In some cases guests should not provide workarounds for errata even when the
> physical processor is affected. For example, because of erratum 400 on family
> 10h processors a Linux guest will read an MSR (resulting in VMEXIT) before
> going to idle in order to avoid getting stuck in a non-C0 state. This is not
> necessary: HLT and IO instructions are intercepted and therefore there is no
> reason for erratum 400 workaround in the guest.
>
> This patch allows us to present a guest with certain errata as fixed,
> regardless of the state of actual hardware.
>
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@amd.com>
Patch does not apply, please regenerate against
git://git.kernel.org/pub/scm/virt/kvm/kvm.git master branch.
prev parent reply other threads:[~2012-01-09 12:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-06 16:13 [PATCH v2.1] KVM: SVM: Add support for AMD's OSVW feature in guests Boris Ostrovsky
2012-01-09 12:14 ` Marcelo Tosatti [this message]
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