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efi: Warn if trying to reserve memory under Xen 

Doing so cannot work and should never happen.

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>
This commit is contained in:
Demi Marie Obenour 2023-01-19 14:04:00 -05:00 committed by Ard Biesheuvel
parent 01de145dc7
commit fa7bee867d
1 changed files with 4 additions and 0 deletions
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4
drivers/firmware/efi/efi.c
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@ -541,6 +541,10 @@ 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);