linux-kernel - Re: [PATCH v11 0/8] KVM: allow mapping non-refcounted pages

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Message-ID: <ZeCIX5Aw5s1L0YEh@infradead.org>
Date: Thu, 29 Feb 2024 05:36:31 -0800
From: Christoph Hellwig <hch@...radead.org>
To: David Stevens <stevensd@...omium.org>
Cc: Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Yu Zhang <yu.c.zhang@...ux.intel.com>,
	Isaku Yamahata <isaku.yamahata@...il.com>,
	Zhi Wang <zhi.wang.linux@...il.com>,
	Maxim Levitsky <mlevitsk@...hat.com>, kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v11 0/8] KVM: allow mapping non-refcounted pages

On Thu, Feb 29, 2024 at 11:57:51AM +0900, David Stevens wrote:
> Our use case is virtio-gpu blob resources [1], which directly map host
> graphics buffers into the guest as "vram" for the virtio-gpu device.
> This feature currently does not work on systems using the amdgpu driver,
> as that driver allocates non-compound higher order pages via
> ttm_pool_alloc_page().

. and just as last time around that is still the problem that needs
to be fixed instead of creating a monster like this to map
non-refcounted pages.