[edk2-devel] [PATCH] OvmfPkg/XenPlatformPei: Relocate shared_info page mapping
Laszlo Ersek
lersek at redhat.com
Tue Jun 29 09:20:28 UTC 2021
On 06/28/21 15:23, Anthony PERARD via groups.io wrote:
> 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
> location.
>
> 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)) {
> DEBUG ((DEBUG_ERROR,
>
Acked-by: Laszlo Ersek <lersek at redhat.com>
I guess I should merge this after Jan and/or Andrew ack it.
Thanks
Laszlo
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