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OvmfPkg/XenPlatformPei: Reserve VGA memory region, to boot Linux 

Linux panic if the VGA region isn't reserved.

When Linux is booted on EFI system, it expects the memory at 0xa0000 to
_not_ be conventional memory. Otherwise a variable isn't initialised
properly and Linux panic when a virtual console/terminal is asked to be
created.

See for more detail:
https://lists.xenproject.org/archives/html/xen-devel/2019-03/msg02139.html

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190813113119.14804-25-anthony.perard@citrix.com>
This commit is contained in:
Anthony PERARD 2019-08-13 12:31:08 +01:00 committed by Laszlo Ersek
parent 24465c380a
commit 77d35f5008
1 changed files with 16 additions and 0 deletions
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16
OvmfPkg/XenPlatformPei/Xen.c
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@ -294,6 +294,12 @@ XenPublishRamRegions (
Status = XenGetE820Map (&E820Map, &E820EntriesCount);
ASSERT_EFI_ERROR (Status);
AddMemoryBaseSizeHob (0, 0xA0000);
//
// Video memory + Legacy BIOS region, to allow Linux to boot.
//
AddReservedMemoryBaseSizeHob (0xA0000, BASE_1MB - 0xA0000, TRUE);
LapicBase = PcdGet32 (PcdCpuLocalApicBaseAddress);
LapicEnd = LapicBase + SIZE_1MB;
AddIoMemoryRangeHob (LapicBase, LapicEnd);
@ -312,6 +318,16 @@ XenPublishRamRegions (
Base = ALIGN_VALUE (Entry->BaseAddr, (UINT64)EFI_PAGE_SIZE);
End = (Entry->BaseAddr + Entry->Length) & ~(UINT64)EFI_PAGE_MASK;
//
// Ignore the first 1MB, this is handled before the loop.
//
if (Base < BASE_1MB) {
Base = BASE_1MB;
}
if (Base >= End) {
continue;
}
switch (Entry->Type) {
case EfiAcpiAddressRangeMemory:
AddMemoryRangeHob (Base, End);