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| author | Demi Marie Obenour <demi@invisiblethingslab.com> | 2023-01-19 14:03:57 -0500 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2023-01-22 10:14:15 +0100 |
| commit | aca1d27ac38a61d7db4b56418386992cb96b63f0 (patch) | |
| tree | de5f4428831e9caf2ff8a1cbacb3753f59d083b9 /include/linux/efi.h | |
| parent | ab03e91e60ce457a90e6aa2c97ca2fa139b73f55 (diff) | |
| download | linux-aca1d27ac38a61d7db4b56418386992cb96b63f0.tar.gz linux-aca1d27ac38a61d7db4b56418386992cb96b63f0.tar.bz2 linux-aca1d27ac38a61d7db4b56418386992cb96b63f0.zip | |
efi: xen: Implement memory descriptor lookup based on hypercall
Xen on x86 boots dom0 in EFI mode but without providing a memory map.
This means that some consistency checks we would like to perform on
configuration tables or other data structures in memory are not
currently possible. Xen does, however, expose EFI memory descriptor
info via a Xen hypercall, so let's wire that up instead. It turns out
that the returned information is not identical to what Linux's
efi_mem_desc_lookup would return: the address returned is the address
passed to the hypercall, and the size returned is the number of bytes
remaining in the configuration table. However, none of the callers of
efi_mem_desc_lookup() currently care about this. In the future, Xen may
gain a hypercall that returns the actual start address, which can be
used instead.
Co-developed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Demi Marie Obenour <demi@invisiblethingslab.com>
Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'include/linux/efi.h')
| -rw-r--r-- | include/linux/efi.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/efi.h b/include/linux/efi.h index f6b107da1cbc..4d7a44f60990 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -731,6 +731,7 @@ extern u64 efi_mem_attribute (unsigned long phys_addr, unsigned long size); extern int __init efi_uart_console_only (void); extern u64 efi_mem_desc_end(efi_memory_desc_t *md); extern int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md); +extern int __efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md); extern void efi_mem_reserve(phys_addr_t addr, u64 size); extern int efi_mem_reserve_persistent(phys_addr_t addr, u64 size); extern void efi_initialize_iomem_resources(struct resource *code_resource, |