From: Eric Auger <eric.auger@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: eric.auger.pro@gmail.com, qemu-devel@nongnu.org,
qemu-arm@nongnu.org, jean-philippe@linaro.org,
alex.williamson@redhat.com, clg@redhat.com,
peter.maydell@linaro.org, Peter Xu <peterx@redhat.com>
Subject: Re: [PATCH v2] virtio-iommu: Use qemu_real_host_page_mask as default page_size_mask
Date: Tue, 13 Feb 2024 12:24:22 +0100 [thread overview]
Message-ID: <417ea71e-fb45-4e1d-b8e5-9d54d93dba3b@redhat.com> (raw)
In-Reply-To: <20240213060731-mutt-send-email-mst@kernel.org>
Hi Michael,
On 2/13/24 12:09, Michael S. Tsirkin wrote:
> On Tue, Feb 13, 2024 at 11:32:13AM +0100, Eric Auger wrote:
>> Do you have an other concern?
> I also worry a bit about migrating between hosts with different
> page sizes. Not with kvm I am guessing but with tcg it does work I think?
I have never tried but is it a valid use case? Adding Peter in CC.
> Is this just for vfio and vdpa? Can we limit this to these setups
> maybe?
I am afraid we know the actual use case too later. If the VFIO device is
hotplugged we have started working with 4kB granule.
The other way is to introduce a min_granule option as done for aw-bits.
But it is heavier.
Thanks
Eric
>
next prev parent reply other threads:[~2024-02-13 11:25 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-17 13:20 [PATCH v2] virtio-iommu: Use qemu_real_host_page_mask as default page_size_mask Eric Auger
2024-02-13 9:43 ` Michael S. Tsirkin
2024-02-13 10:32 ` Eric Auger
2024-02-13 11:07 ` Michael S. Tsirkin
2024-02-13 11:19 ` Eric Auger
2024-02-13 11:39 ` Michael S. Tsirkin
2024-02-13 11:49 ` Eric Auger
2024-02-13 11:09 ` Michael S. Tsirkin
2024-02-13 11:24 ` Eric Auger [this message]
2024-02-13 12:00 ` Michael S. Tsirkin
2024-02-21 10:41 ` Eric Auger
2024-02-21 11:31 ` Jean-Philippe Brucker
2024-02-21 12:45 ` Eric Auger
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