diff options
| author | Gerd Hoffmann <kraxel@redhat.com> | 2023-06-01 09:57:31 +0200 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2023-06-01 09:00:00 +0000 |
| commit | c1e853769046b322690ad336fdb98966757e7414 (patch) | |
| tree | 1f0976d2afc4787c2eba5e74e6f8a765a56ca457 | |
| parent | 578a715cfc6abc08ead8f585f096789374254b2a (diff) | |
| download | edk2-c1e853769046b322690ad336fdb98966757e7414.tar.gz edk2-c1e853769046b322690ad336fdb98966757e7414.tar.bz2 edk2-c1e853769046b322690ad336fdb98966757e7414.zip | |
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>
| -rw-r--r-- | OvmfPkg/Library/PlatformInitLib/MemDetect.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/OvmfPkg/Library/PlatformInitLib/MemDetect.c b/OvmfPkg/Library/PlatformInitLib/MemDetect.c index 1102b00ecb..662e7e85bb 100644 --- a/OvmfPkg/Library/PlatformInitLib/MemDetect.c +++ b/OvmfPkg/Library/PlatformInitLib/MemDetect.c @@ -646,16 +646,19 @@ 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)) {
|