linux-kernel - Re: [PATCH v5 9/9] Documentation: virtual: kvm: Support vcpu preempted check

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Message-ID: <20161021183951.GA29131@potion>
Date:   Fri, 21 Oct 2016 20:39:52 +0200
From:   "rkrcmar@...hat.com" <rkrcmar@...hat.com>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     "'Pan Xinhui'" <xinhui.pan@...ux.vnet.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "xen-devel-request@...ts.xenproject.org" 
        <xen-devel-request@...ts.xenproject.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "kernellwp@...il.com" <kernellwp@...il.com>,
        "jgross@...e.com" <jgross@...e.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "will.deacon@....com" <will.deacon@....com>,
        "borntraeger@...ibm.com" <borntraeger@...ibm.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "paulus@...ba.org" <paulus@...ba.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
        "boqun.feng@...il.com" <boqun.feng@...il.com>
Subject: Re: [PATCH v5 9/9] Documentation: virtual: kvm: Support vcpu
 preempted check

2016-10-21 11:27+0000, David Laight:
> From: Pan Xinhui
>> Sent: 20 October 2016 22:28
>> Commit ("x86, kvm: support vcpu preempted check") add one field "__u8
>> preempted" into struct kvm_steal_time. This field tells if one vcpu is
>> running or not.
>> 
>> It is zero if 1) some old KVM deos not support this filed. 2) the vcpu is
>> preempted. Other values means the vcpu has been preempted.
>> 
>> Signed-off-by: Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
>> ---
>>  Documentation/virtual/kvm/msr.txt | 8 +++++++-
>>  1 file changed, 7 insertions(+), 1 deletion(-)
>> 
>> diff --git a/Documentation/virtual/kvm/msr.txt b/Documentation/virtual/kvm/msr.txt
>> index 2a71c8f..3376f13 100644
>> --- a/Documentation/virtual/kvm/msr.txt
>> +++ b/Documentation/virtual/kvm/msr.txt
>> @@ -208,7 +208,8 @@ MSR_KVM_STEAL_TIME: 0x4b564d03
>>  		__u64 steal;
>>  		__u32 version;
>>  		__u32 flags;
>> -		__u32 pad[12];
>> +		__u8  preempted;
>> +		__u32 pad[11];
>>  	}
> 
> I think I'd be explicit about the 3 pad bytes you've left.

Seconded.

With that change are all KVM bits

Acked-by: Radim Krčmář <rkrcmar@...hat.com>