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Re: [PATCH v4 4/4] qemu-options.hx: Add an entry for virtio-iommu-pci an


From: Cédric Le Goater
Subject: Re: [PATCH v4 4/4] qemu-options.hx: Add an entry for virtio-iommu-pci and document aw-bits
Date: Wed, 14 Feb 2024 08:47:05 +0100
User-agent: Mozilla Thunderbird

On 2/13/24 19:28, Eric Auger wrote:
We are missing an entry for the virtio-iommu-pci device. Add the
information on which machine it is currently supported and document
the new aw-bits option.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
  qemu-options.hx | 8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/qemu-options.hx b/qemu-options.hx
index 8547254dbf..6a8c970640 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1172,6 +1172,14 @@ SRST
      Please also refer to the wiki page for general scenarios of VT-d
      emulation in QEMU: https://wiki.qemu.org/Features/VT-d.
+``-device virtio-iommu-pci[,option=...]``
+    This is only supported by ``-machine q35`` and ``-machine virt``.
+    It supports below options:
+
+    ``aw-bits=val`` (val between 32 and 64, default depends on machine)
+        This decides the address width of IOVA address space. With
+        q35 it defaults to 39 bits. On arm virt it defaults to 48 bits.


Minor improvement :

 "It defaults to 39 bits on q35 machines and 48 bits on ARM virt machines."

Anyhow,

Reviewed-by: Cédric Le Goater <clg@redhat.com>

Thanks,

C.





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