Maoming reported that guest memory sizes equal to or larger than 64GB
were not correctly handled by OVMF.
Enabling the DEBUG_GCD (0x00100000) bit in PcdDebugPrintErrorLevel, and
starting QEMU with 64GB guest RAM size, I found the following error in the
OVMF debug log:
> GCD:AddMemorySpace(Base=0000000100000000,Length=0000000F40000000)
> GcdMemoryType = Reserved
> Capabilities = 030000000000000F
> Status = Unsupported
This message is emitted when the DXE core is initializing the memory space
map, processing the "above 4GB" memory resource descriptor HOB that was
created by OVMF's QemuInitializeRam() function (see "UpperMemorySize").
The DXE core's call chain fails in:
CoreInternalAddMemorySpace() [MdeModulePkg/Core/Dxe/Gcd/Gcd.c]
CoreConvertSpace()
//
// Search for the list of descriptors that cover the range BaseAddress
// to BaseAddress+Length
//
CoreSearchGcdMapEntry()
CoreSearchGcdMapEntry() fails because the one entry (with type
"nonexistent") in the initial GCD memory space map is too small, and
cannot be split to cover the memory space range being added:
> GCD:Initial GCD Memory Space Map
> GCDMemType Range Capabilities Attributes
> ========== ================================= ================ ================
> NonExist 0000000000000000-0000000FFFFFFFFF 0000000000000000 0000000000000000
The size of this initial entry is determined from the CPU HOB
(CoreInitializeGcdServices()).
Set the SizeOfMemorySpace field in the CPU HOB to mPhysMemAddressWidth,
which is the narrowest valid value to cover the entire guest RAM.
Reported-by: Maoming <maoming.maom...@huawei.com>
Cc: Maoming <maoming.maom...@huawei.com>
Cc: Huangpeng (Peter) <peter.huangp...@huawei.com>
Cc: Wei Liu <wei.l...@citrix.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
---
OvmfPkg/PlatformPei/Platform.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index 9634ce0..e8b4b88 100644
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -241,9 +241,11 @@ MiscInitialization (
IoOr8 (0x92, BIT1);
//
- // Build the CPU hob with 36-bit addressing and 16-bits of IO space.
+ // Build the CPU HOB with guest RAM size dependent address width and 16-bits
+ // of IO space. (Side note: unlike other HOBs, the CPU HOB is needed during
+ // S3 resume as well, so we build it unconditionally.)
//
- BuildCpuHob (36, 16);
+ BuildCpuHob (mPhysMemAddressWidth, 16);
//
// Query Host Bridge DID to determine platform type and save to PCD
--
1.8.3.1
------------------------------------------------------------------------------
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