The UEFI specification does not define a device sub-type for virtio. Let's use a vendor hardware node here.

This avoids creation of two handles with the same device path indicating our root node.

Reported-by: Ard Biesheuvel ardb@kernel.org Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- include/efi_loader.h | 4 ++++ lib/efi_loader/efi_device_path.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+)

diff --git a/include/efi_loader.h b/include/efi_loader.h index 75c20e4679..f902d8765a 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -41,6 +41,10 @@ static inline void *guidcpy(void *dst, const void *src) #define U_BOOT_HOST_DEV_GUID \ EFI_GUID(0xbbe4e671, 0x5773, 0x4ea1, \ 0x9a, 0xab, 0x3a, 0x7d, 0xbf, 0x40, 0xc4, 0x82) +/* GUID used as root for virtio devices */ +#define U_BOOT_VIRTIO_DEV_GUID \ + EFI_GUID(0x63293792, 0xadf5, 0x9325, \ + 0xb9, 0x9f, 0x4e, 0x0e, 0x45, 0x5c, 0x1b, 0x1e)

/* Use internal device tree when starting UEFI application */ #define EFI_FDT_USE_INTERNAL NULL diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c index f9349484a6..1606c830b8 100644 --- a/lib/efi_loader/efi_device_path.c +++ b/lib/efi_loader/efi_device_path.c @@ -20,6 +20,9 @@ #ifdef CONFIG_SANDBOX const efi_guid_t efi_guid_host_dev = U_BOOT_HOST_DEV_GUID; #endif +#ifdef CONFIG_VIRTIO_BLK +const efi_guid_t efi_guid_virtio_dev = U_BOOT_VIRTIO_DEV_GUID; +#endif

/* template END node: */ static const struct efi_device_path END = { @@ -467,6 +470,16 @@ __maybe_unused static unsigned int dp_size(struct udevice *dev) */ return dp_size(dev->parent) + sizeof(struct efi_device_path_vendor) + 1; +#endif +#ifdef CONFIG_VIRTIO_BLK + case UCLASS_VIRTIO: + /* + * Virtio devices will be represented as a vendor + * device node with an extra byte for the device + * number. + */ + return dp_size(dev->parent) + + sizeof(struct efi_device_path_vendor) + 1; #endif default: return dp_size(dev->parent); @@ -545,6 +558,23 @@ __maybe_unused static void *dp_fill(void *buf, struct udevice *dev) return &dp->vendor_data[1]; } #endif +#ifdef CONFIG_VIRTIO_BLK + case UCLASS_VIRTIO: { + struct efi_device_path_vendor *dp; + struct blk_desc *desc = dev_get_uclass_platdata(dev); + + dp_fill(buf, dev->parent); + dp = buf; + ++dp; + dp->dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE; + dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_VENDOR; + dp->dp.length = sizeof(*dp) + 1; + memcpy(&dp->guid, &efi_guid_virtio_dev, + sizeof(efi_guid_t)); + dp->vendor_data[0] = desc->devnum; + return &dp->vendor_data[1]; + } +#endif #ifdef CONFIG_IDE case UCLASS_IDE: { struct efi_device_path_atapi *dp = -- 2.26.2