On Mon, Jun 15, 2026 at 11:11:53AM +0200, Luigi Leonardi wrote:
Coconut SVSM, with the upcoming device tree support [1], will use
the IGVM device tree parameter to discover virtio-mmio and ISA serial
devices instead of relying on the fw_cfg interface, which is
QEMU-specific.
The device tree is packed before copying into the IGVM parameter area
to reduce its size, since IGVM files can define tighter memory
constraints for parameter areas. Packing is done in the generic IGVM
backend rather than in per-architecture device tree setup code, so
that each architecture does not need to handle it individually.
[1] https://github.com/coconut-svsm/svsm/pull/1006
Signed-off-by: Luigi Leonardi <[email protected]>
---
This device tree will be consumed by Coconut SVSM with the upcoming device
tree support [1]. This will allow SVSM to run on a normal CPU
(not AMD SEV-SNP) and execute all its tests using upstream QEMU.
Eventually edk2 will also be able to consume DT via IGVM, but the work
has not started yet.
[1] https://github.com/coconut-svsm/svsm/pull/1006
To: [email protected]
Cc: Michael S. Tsirkin <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: Stefano Garzarella <[email protected]>
Cc: Ani Sinha <[email protected]>
Cc: Zhao Liu <[email protected]>
Cc: Oliver Steffen <[email protected]>
---
Changes in v4:
- Using g_memdup2 [Stefano]
- madt directive is now protected by CONFIG_FDT [Stefano]
- Link to v3:
https://lore.kernel.org/qemu-devel/[email protected]
Thanks for the update, LGTM!
Reviewed-by: Stefano Garzarella <[email protected]>
