* Re: 回复: Re: [PATCH] kvm: fix gpu passthrough into vm on arm64
[not found] <1zpfpvw7azf-1zpgztpmct8@nsmail6.0>
@ 2022-03-25 13:06 ` Marc Zyngier
0 siblings, 0 replies; only message in thread
From: Marc Zyngier @ 2022-03-25 13:06 UTC (permalink / raw)
To: 谢明; +Cc: christoffer.dall, kvmarm, linux-arm-kernel, linux-kernel
On Fri, 25 Mar 2022 01:06:17 +0000,
谢明 <xieming@kylinos.cn> wrote:
>
> thanks for your reply !
> you are right, 'If the device supports NORMAL_NC, this should
> be known by the host kernel and exposed to KVM'， accordding the kvm
> combining rules on arm64， stage1 is setting to NORMAL_NC， so can
> we add a conditional judement when ioremapping on stage2, if the
> device suppurt NORMAL_NC we setting the memory attribute to
> PAGE_S2_NC ?
The question remains: how do you convey that capability to the host?
There is nothing currently telling KVM what memory type to use.
M.
--
Without deviation from the norm, progress is not possible.
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