Re: [PATCH] KVM: x86: do not save guest-unsupported XSAVE state

From	Radim Krčmář <rkrcmar@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] KVM: x86: do not save guest-unsupported XSAVE state
Date	2017-02-04 17:30 +0100
Message-ID	<t7bnQ-2XG-35@gated-at.bofh.it> (permalink)
References	<t6390-6uR-7@gated-at.bofh.it> <t6di2-4Nn-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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2017-02-01 16:13-0800, Paolo Bonzini:
> On 01/02/2017 05:19, Radim Krčmář wrote:
>> Saving unsupported state prevents migration when the new host does not
>> support a XSAVE feature of the original host, even if the feature is not
>> exposed to the guest.
>> 
>> We've masked host features with guest-visible features before, with
>> 4344ee981e21 ("KVM: x86: only copy XSAVE state for the supported
>> features") and dropped it when implementing XSAVES.  Do it again.
>> 
>> Fixes: df1daba7d1cb ("KVM: x86: support XSAVES usage in the host")
>> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
> 
> Cc: stable@vger.kernel.org
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> 
> Please apply to kvm/master and send it yourself to Linus since I don't
> have access to my machine this week.

Done, thanks.

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[PATCH] KVM: x86: do not save guest-unsupported XSAVE state Radim Krčmář <rkrcmar@redhat.com> - 2017-02-01 14:30 +0100
  Re: [PATCH] KVM: x86: do not save guest-unsupported XSAVE state Paolo Bonzini <pbonzini@redhat.com> - 2017-02-02 01:20 +0100
    Re: [PATCH] KVM: x86: do not save guest-unsupported XSAVE state Radim Krčmář <rkrcmar@redhat.com> - 2017-02-04 17:30 +0100

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