[PATCH v3 5/5] efi: Warn if trying to reserve memory under Xen

[Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>]

Doing so cannot work and should never happen.

Signed-off-by: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
Tested-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
---
 drivers/firmware/efi/efi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 
b49fcde06ca0ff5347047666f38b9309bd9cfe26..902f323499d8acc4f2b846a78993eb201448acad
 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -519,6 +519,10 @@ void __init __weak efi_arch_mem_reserve(phys_addr_t addr, 
u64 size) {}
  */
 void __init efi_mem_reserve(phys_addr_t addr, u64 size)
 {
+       /* efi_mem_reserve() does not work under Xen */
+       if (WARN_ON_ONCE(efi_enabled(EFI_PARAVIRT)))
+               return;
+
        if (!memblock_is_region_reserved(addr, size))
                memblock_reserve(addr, size);
 
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab