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add patch to work around older guest kernel bug

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by limiting the phys-bits to 46 instead of 47. On Ubuntu 18.04 with
kernel 4.15, using 47 leads to a strange issue where initialization of
VirtIO devices would fail.

Reported in the community forum:
https://forum.proxmox.com/threads/127410/

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
This commit is contained in:
Fiona Ebner 2023-06-05 09:43:50 +02:00 committed by Thomas Lamprecht
parent f9d3c7f9b1
commit c252b4e501
2 changed files with 47 additions and 0 deletions
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46
debian/patches/0001-OvmfPkg-PlatformInitLib-limit-phys-bits-to-46.patch vendored Normal file
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@ -0,0 +1,46 @@
From 89a12f2a42b989e7925b4a71e503209971eaa271 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Thu, 1 Jun 2023 09:57:31 +0200
Subject: [PATCH] OvmfPkg/PlatformInitLib: limit phys-bits to 46.
Older linux kernels have problems with phys-bits larger than 46,
ubuntu 18.04 (kernel 4.15) has been reported to be affected.
Reduce phys-bits limit from 47 to 46.
Reported-by: Fiona Ebner <f.ebner@proxmox.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
OvmfPkg/Library/PlatformInitLib/MemDetect.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/OvmfPkg/Library/PlatformInitLib/MemDetect.c b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
index 38cece9173..4d0522ce22 100644
--- a/OvmfPkg/Library/PlatformInitLib/MemDetect.c
+++ b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
@@ -657,16 +657,19 @@ PlatformAddressWidthFromCpuid (
));
if (Valid) {
- if (PhysBits > 47) {
+ if (PhysBits > 46) {
/*
* Avoid 5-level paging altogether for now, which limits
* PhysBits to 48. Also avoid using address bit 48, due to sign
* extension we can't identity-map these addresses (and lots of
* places in edk2 assume we have everything identity-mapped).
* So the actual limit is 47.
+ *
+ * Also some older linux kernels apparently have problems handling
+ * phys-bits > 46 correctly, so use that as limit.
*/
- DEBUG ((DEBUG_INFO, "%a: limit PhysBits to 47 (avoid 5-level paging)\n", __func__));
- PhysBits = 47;
+ DEBUG ((DEBUG_INFO, "%a: limit PhysBits to 46 (avoid 5-level paging)\n", __func__));
+ PhysBits = 46;
}
if (!Page1GSupport && (PhysBits > 40)) {
--
2.39.2

1
debian/patches/series vendored
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@ -2,3 +2,4 @@ no-stack-protector-all-archs.diff
brotlicompress-disable.diff
x64-baseline-abi.patch
Revert-ArmVirtPkg-make-EFI_LOADER_DATA-non-executabl.patch
0001-OvmfPkg-PlatformInitLib-limit-phys-bits-to-46.patch