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virtio-devices: add VIRTIO_F_ACCESS_PLATFORM to watchdog and iommu

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A confidential guest (e.g. SEV-SNP) requires every virtio device to
advertise VIRTIO_F_ACCESS_PLATFORM so the guest driver routes DMA
through the platform's bounce-buffer path; the driver refuses a device
that does not offer it.

Add VIRTIO_F_ACCESS_PLATFORM support to virtio-{watchdog,iommu} which
are exercised as part of the CVM integration tests.

Assisted-by: Claude:Opus-4.8
Signed-off-by: Ruben Hakobyan <hruben@meta.com>
This commit is contained in:
Ruben Hakobyan
2026-06-02 17:10:28 -07:00
committed by Rob Bradford
parent 2b71ffd48e
commit 9e6c817192
5 changed files with 19 additions and 4 deletions
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fuzz/fuzz_targets/watchdog.rs
+1
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@@ -37,6 +37,7 @@ fuzz_target!(|bytes: &[u8]| -> Corpus {
let mut watchdog = virtio_devices::Watchdog::new(
"fuzzer_watchdog".to_owned(),
false,
EventFd::new(EFD_NONBLOCK).unwrap(),
SeccompAction::Allow,
EventFd::new(EFD_NONBLOCK).unwrap(),