[edk2-devel] [PATCH] OvmfPkg/XenPlatformPei: Relocate shared_info page mapping

Anthony PERARD via groups.io anthony.perard=citrix.com at groups.io
Mon Jun 28 13:23:37 UTC 2021

From: Anthony PERARD <anthony.perard at citrix.com>

Unfortunately, Xen isn't ready to deal with mapping at the top of the
physical address space, so we relocate the mapping after the LAPIC

See this thread about the issue with the mapping:
- https://lore.kernel.org/xen-devel/f8c4151a-6dac-d87c-ef46-eb35ada07bd9@suse.com/

The PhysicalAddressIdentityMapping() call isn't going to do anything
anymore since everything under 4GB is already mapped, but there is no
need to remove the call.

CC: Jan Beulich <JBeulich at suse.com>
CC: Andrew Cooper <andrew.cooper3 at citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard at citrix.com>
 OvmfPkg/XenPlatformPei/Xen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/OvmfPkg/XenPlatformPei/Xen.c b/OvmfPkg/XenPlatformPei/Xen.c
index a4e82b356936..9c6641895970 100644
--- a/OvmfPkg/XenPlatformPei/Xen.c
+++ b/OvmfPkg/XenPlatformPei/Xen.c
@@ -569,7 +569,7 @@ CalibrateLapicTimer (
   EFI_STATUS            Status;
-  SharedInfo = (VOID*)((1ULL << mPhysMemAddressWidth) - EFI_PAGE_SIZE);
+  SharedInfo = (VOID*)((UINTN)PcdGet32 (PcdCpuLocalApicBaseAddress) + SIZE_1MB);
   Status = PhysicalAddressIdentityMapping ((EFI_PHYSICAL_ADDRESS)SharedInfo);
   if (EFI_ERROR (Status)) {
Anthony PERARD

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