On Wed, Jul 01, 2026 at 04:16:16PM +0200, Luigi Leonardi wrote:
This series adds support for the uefi-vars-sysbus device on the microvm machine type, enabling persistent UEFI variable storage.The uefi-vars-sysbus device is a sysbus device that is attached to the platform bus, which microvm does not currently support. To address this, the series adds a platform bus to microvm, following the same pattern used by the ARM virt machine. The platform bus is mapped at 0xfec20000 with a 1 MB window, placed after the IOAPICs. It is created without IRQ lines since the uefi-vars-sysbus device only requires MMIO. Patch 1 fixes a crash in the platform bus core when num_irqs is zero, which is needed to support an MMIO-only platform bus. Patch 2 adds the platform bus to microvm with MMIO mapping and FDT integration. Patch 3 allows the uefi-vars-sysbus device to be instantiated on microvm. Corresponding edk2 changes[1] [1]https://github.com/tianocore/edk2/pull/12751 To: [email protected] Cc: Paolo Bonzini <[email protected]> Cc: Michael S. Tsirkin <[email protected]> Cc: Richard Henderson <[email protected]> Cc: Sergio Lopez <[email protected]> Cc: Gerd Hoffmann <[email protected]> Suggested-by: Gerd Hoffmann <[email protected]> Signed-off-by: Luigi Leonardi <[email protected]> --- Luigi Leonardi (3): hw/core/platform-bus: fix crash when num_irqs is zero hw/i386/microvm: add platform bus support hw/i386/microvm: add uefi-vars-sysbus support hw/core/platform-bus.c | 4 ++++ hw/i386/Kconfig | 1 + hw/i386/microvm-dt.c | 9 +++++++++ hw/i386/microvm.c | 38 ++++++++++++++++++++++++++++++++++++++ include/hw/i386/microvm.h | 4 ++++ 5 files changed, 56 insertions(+) --- base-commit: f38d6ae70f100fc8d3f095a842d2f1ca29262218 change-id: 20260701-microvm_uefi_var-8a434ce7f8b9 Best regards, -- Luigi Leonardi <[email protected]>
Gentle ping :) Thanks, Luigi
