From: Dmitry Osipenko <dmitry.osipenko@collabora.com>
To: "Christian König" <christian.koenig@amd.com>,
"David Airlie" <airlied@linux.ie>,
"Huang Rui" <ray.huang@amd.com>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Trigger Huang" <Trigger.Huang@gmail.com>,
"Gert Wollny" <gert.wollny@collabora.com>,
"Antonio Caggiano" <antonio.caggiano@collabora.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org,
virtualization@lists.linux-foundation.org,
Dmitry Osipenko <digetx@gmail.com>,
kernel@collabora.com
Subject: Re: [PATCH v1] drm/ttm: Refcount allocated tail pages
Date: Mon, 15 Aug 2022 13:09:11 +0300 [thread overview]
Message-ID: <134bce02-58d6-8553-bb73-42dfda18a595@collabora.com> (raw)
In-Reply-To: <8230a356-be38-f228-4a8e-95124e8e8db6@amd.com>
On 8/15/22 13:05, Christian König wrote:
> Am 15.08.22 um 11:54 schrieb Dmitry Osipenko:
>> Higher order pages allocated using alloc_pages() aren't refcounted and
>> they
>> need to be refcounted, otherwise it's impossible to map them by KVM. This
>> patch sets the refcount of the tail pages and fixes the KVM memory
>> mapping
>> faults.
>>
>> Without this change guest virgl driver can't map host buffers into guest
>> and can't provide OpenGL 4.5 profile support to the guest. The host
>> mappings are also needed for enabling the Venus driver using host GPU
>> drivers that are utilizing TTM.
>>
>> Based on a patch proposed by Trigger Huang.
>
> Well I can't count how often I have repeated this: This is an absolutely
> clear NAK!
>
> TTM pages are not reference counted in the first place and because of
> this giving them to virgl is illegal.
A? The first page is refcounted when allocated, the tail pages are not.
> Please immediately stop this completely broken approach. We have
> discussed this multiple times now.
Could you please give me a link to these discussions?
--
Best regards,
Dmitry
next prev parent reply other threads:[~2022-08-15 10:10 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-15 9:54 [PATCH v1] drm/ttm: Refcount allocated tail pages Dmitry Osipenko
2022-08-15 10:05 ` Christian König
2022-08-15 10:09 ` Dmitry Osipenko [this message]
2022-08-15 10:11 ` Christian König
2022-08-15 10:14 ` Christian König
2022-08-15 10:18 ` Dmitry Osipenko
2022-08-15 10:42 ` Christian König
2022-08-15 10:47 ` Dmitry Osipenko
2022-08-15 10:51 ` Christian König
2022-08-15 11:19 ` Dmitry Osipenko
2022-08-15 11:28 ` Christian König
2022-08-15 11:50 ` Dmitry Osipenko
2022-08-15 13:06 ` Christian König
2022-08-15 13:45 ` Dmitry Osipenko
2022-08-15 13:53 ` Christian König
2022-08-15 14:57 ` Dmitry Osipenko
2022-08-15 15:54 ` Dmitry Osipenko
2022-08-17 22:57 ` Dmitry Osipenko
2022-08-17 23:13 ` Dmitry Osipenko
2022-08-18 9:41 ` Christian König
2023-01-11 17:05 ` Sean Christopherson
2023-01-11 21:24 ` Dmitry Osipenko
2022-09-06 20:01 ` Daniel Vetter
2022-09-06 20:05 ` Daniel Vetter
2022-09-07 6:48 ` Christian König
2023-01-11 17:13 ` Sean Christopherson
2022-09-08 11:04 ` Rob Clark
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