From: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
To: linux-efi@vger.kernel.org
Cc: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>,
stable@kernel.org, Ard Biesheuvel <ardb@kernel.org>,
Allen Pais <apais@linux.microsoft.com>,
Tyler Hicks <code@tyhicks.com>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jonathan Marek <jonathan@marek.ca>,
linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] efi: bump up EFI_MMAP_NR_SLACK_SLOTS to 32
Date: Mon, 9 Dec 2024 13:20:39 -0500 [thread overview]
Message-ID: <20241209182041.60286-1-hamzamahfooz@linux.microsoft.com> (raw)
Recent platforms require more slack slots than the current value of
EFI_MMAP_NR_SLACK_SLOTS, otherwise they fail to boot. The current
workaround is to append `efi=disable_early_pci_dma` to the kernel's
cmdline. So, bump up EFI_MMAP_NR_SLACK_SLOTS to 32 to allow those
platforms to boot with the aforementioned workaround.
Cc: stable@kernel.org
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Allen Pais <apais@linux.microsoft.com>
Cc: Tyler Hicks <code@tyhicks.com>
Signed-off-by: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
---
drivers/firmware/efi/libstub/efistub.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index 76e44c185f29..e95ce6ae5c26 100644
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -171,7 +171,7 @@ void efi_set_u64_split(u64 data, u32 *lo, u32 *hi)
* the EFI memory map. Other related structures, e.g. x86 e820ext, need
* to factor in this headroom requirement as well.
*/
-#define EFI_MMAP_NR_SLACK_SLOTS 8
+#define EFI_MMAP_NR_SLACK_SLOTS 32
typedef struct efi_generic_dev_path efi_device_path_protocol_t;
--
2.47.1
next reply other threads:[~2024-12-09 18:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-09 18:20 Hamza Mahfooz [this message]
2024-12-10 9:59 ` [PATCH] efi: bump up EFI_MMAP_NR_SLACK_SLOTS to 32 Ard Biesheuvel
2024-12-19 10:26 ` Ard Biesheuvel
2024-12-31 11:11 ` Víctor Gonzalo
2025-01-07 7:36 ` Ard Biesheuvel
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