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Message-Id: <e51d5abde5c5dfd122cb96f71d0dd8acc0cd358d.1669264419.git.demi@invisiblethingslab.com>
Date: Thu, 19 Jan 2023 14:04:00 -0500
From: Demi Marie Obenour <demi@...isiblethingslab.com>
To: Ard Biesheuvel <ardb@...nel.org>, Juergen Gross <jgross@...e.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Cc: Demi Marie Obenour <demi@...isiblethingslab.com>,
Marek Marczykowski-Górecki
<marmarek@...isiblethingslab.com>, linux-efi@...r.kernel.org,
linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: [PATCH v3 5/5] efi: Warn if trying to reserve memory under Xen
Doing so cannot work and should never happen.
Signed-off-by: Demi Marie Obenour <demi@...isiblethingslab.com>
Tested-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
---
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
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