[PATCH] EFI: Fix relocating ESRT for dom0

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

Fix calculating the table size - it consists of a header + entries, not
just entries.
This bug caused the last entry to have garbage in its final fields,
including LowestSupportedFwVersion and CapsuleFlags, which (usually)
made fwupd to detect firmware update availability, but refuse actually
installing it.

Fixes: dc7da0874ba4 ("EFI: preserve the System Resource Table for dom0")
Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
---
 xen/common/efi/boot.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index 5b84dbf26e5e..45015a0dd583 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -675,7 +675,8 @@ static size_t __init get_esrt_size(const 
EFI_MEMORY_DESCRIPTOR *desc)
     if ( esrt_ptr->FwResourceCount > available_len / 
sizeof(esrt_ptr->Entries[0]) )
         return 0;
 
-    return esrt_ptr->FwResourceCount * sizeof(esrt_ptr->Entries[0]);
+    return offsetof(EFI_SYSTEM_RESOURCE_TABLE, Entries) +
+        esrt_ptr->FwResourceCount * sizeof(esrt_ptr->Entries[0]);
 }
 
 static EFI_GUID __initdata esrt_guid = EFI_SYSTEM_RESOURCE_TABLE_GUID;
-- 
2.51.0