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Subject: Re: [PATCH] KVM MMU: check pending exception before injecting APF
To: Greg KH <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org, nikola.ciprich@linuxbox.cz,
        Haozhong Zhang <haozhong.zhang@intel.com>
References: <1518195642-14761-1-git-send-email-pbonzini@redhat.com>
 <20180209171729.GA20345@kroah.com>
From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Fri, 9 Feb 2018 18:21:13 +0100
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On 09/02/2018 18:17, Greg KH wrote:
> On Fri, Feb 09, 2018 at 06:00:42PM +0100, Paolo Bonzini wrote:
>> From: Haozhong Zhang <haozhong.zhang@intel.com>
>>
>> [ upstream commit 2a266f23550be997d783f27e704b9b40c4010292 Mon Sep 17 00:00:00 2001 ]
> 
> Odd date :)

Oops... git's fake mbox "From" line.

>>
>> For example, when two APF's for page ready happen after one exit and
>> the first one becomes pending, the second one will result in #DF.
>> Instead, just handle the second page fault synchronously.
>>
>> Reported-by: Ross Zwisler <zwisler@gmail.com>
>> Message-ID: <CAOxpaSUBf8QoOZQ1p4KfUp0jq76OKfGY4Uxs-Gg8ngReD99xww@mail.gmail.com>
>> Reported-by: Alec Blayne <ab@tevsa.net>
>> Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
>> Fixes: 664f8e26b00c7673a8303b0d40853a0c24ca93e1
> 
> So this is only needed for 4.14.y?

Yes.  4.13 and 4.15 both work.

Paolo