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efi_loader: device path for virtio block devices

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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>
This commit is contained in:
Heinrich Schuchardt 2020-05-20 22:39:35 +02:00
parent c067cef695
commit 19ecced71c
2 changed files with 34 additions and 0 deletions
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4
include/efi_loader.h
View file

@ -45,6 +45,10 @@ 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

30
lib/efi_loader/efi_device_path.c
View file

@ -22,6 +22,9 @@
#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 = {
@ -469,6 +472,16 @@ __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);
@ -547,6 +560,23 @@ __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 =