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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: Thu, 24 Jan 2019 22:10:41 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 24 Jan 2019 22:11:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
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.
~Andrew
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