On Thu, 29 Sep 2022 15:32:03 +0100,
Peter Xu <[email protected]> wrote:
>
> > If I'm correct, Marc may be talking about SMMU, which is emulated in host
> > instead of QEMU. In this case, the DMA target pages are similar to those
> > pages for vgic/its tables. Both sets of pages are invisible from QEMU.
>
> OK, I'm not aware the SMMU can also be emulated in the host kernel, thanks
> Gavin. If so then we really need to think as I mentioned above since we
> will only sync this when switchover, and if the DMA range can cover a large
> portion of guest mem (assuming the physical pages to DMA can be randomly
> allocated by guest device drivers) then it may be another problem to cause
> drastic downtime.
I don't know where this is coming from. The kernel has no SMMU
emulation at all.
M.
--
Without deviation from the norm, progress is not possible.
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