Re: 回复: Re: [PATCH] kvm: fix gpu passthrough into vm on arm64

[Marc Zyngier]

On Fri, 25 Mar 2022 01:06:17 +0000,
谢明 <xieming@xxxxxxxxxx> 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.