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Re: [Xen-devel] [PATCH] x86/pv: Clean up cr3 handling in arch_set_info_guest()
- To: Julien Grall <julien.grall@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 19 Aug 2019 11:12:24 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 19 Aug 2019 10:12:38 +0000
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On 19/08/2019 11:08, Julien Grall wrote:
> Hi Andrew,
>
> On 8/13/19 7:04 PM, Andrew Cooper wrote:
>> On 24/01/2019 22:10, Andrew Cooper wrote:
>>> On 24/01/2019 21:42, Julien Grall wrote:
>>>> Hi Andrew,
>>>>
>>>> On 12/21/18 1:46 PM, Andrew Cooper wrote:
>>>>> All of this code lives inside CONFIG_PV which means gfn == mfn,
>>>>> and the
>>>>> fill_ro_mpt() calls clearly show that the value is used untranslated.
>>>>>
>>>>> Change cr3_gfn to a suitably typed cr3_mfn, and replace
>>>>> get_page_from_gfn()
>>>>> with a straight mfn_to_page/get_page sequence, to avoid the
>>>>> implication that
>>>>> translation is going on.
>>>>>
>>>>> No functional change.
>>>>>
>>>>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>>>> ---
>>>>> CC: Jan Beulich <JBeulich@xxxxxxxx>
>>>>> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
>>>>> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>>>>> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>>>>> CC: Julien Grall <julien.grall@xxxxxxx>
>>>>>
>>>>> Julien: This should simplify your "xen: Switch parameter in
>>>>> get_page_from_gfn
>>>>> to use typesafe gfn" patch. In particular, I did a doubletake at
>>>>> fill_ro_mpt(_mfn(gfn_x(cr3_gfn))); when reviewing it.
>>>> I was looking at updating my patch and remembered you suggested to
>>>> rebase on top of this. Do you have any plan to resend the patch?
>>> I'll see if I can find some time tomorrow.
>>
>> So maybe I was a little off ;) Better late than never I suppose.
>
> I nearly forgot that work :). Can you CC me on the patch when you send
> it? I will rebase my work on top of it.
I committed it when I sent this email. Rebase on staging and you're good.
~Andrew
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