[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [edk2-devel] [PATCH v3 3/3] OvmfPkg/XenSupport: turn off address decoding before BAR sizing
On 04/30/19 18:35, Anthony PERARD wrote: > On Fri, Apr 26, 2019 at 08:15:07PM +0200, Laszlo Ersek wrote: >> On 04/25/19 22:23, Igor Druzhinin wrote: >>> On Xen, hvmloader firmware leaves address decoding enabled for >>> enumerated PCI device before jumping into OVMF. OVMF seems to >>> expect it to be disabled and tries to size PCI BARs in several places >>> without disabling it which causes BAR64, for example, being >>> incorrectly placed by QEMU. >>> >>> Fix it by disabling PCI address decoding explicitly before the >>> first attempt to size BARs on Xen. >>> >>> Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx> >>> --- >>> Changes in v3: >>> - dropped unused arguments and rename PcatPciRootBridgeDecoding function >>> - make mask application more clear as suggested >>> --- >>> OvmfPkg/Library/PciHostBridgeLib/XenSupport.c | 21 +++++++++++++++++++++ >>> 1 file changed, 21 insertions(+) >>> >>> diff --git a/OvmfPkg/Library/PciHostBridgeLib/XenSupport.c >>> b/OvmfPkg/Library/PciHostBridgeLib/XenSupport.c >>> index 76fca53..b41bd6b 100644 >>> --- a/OvmfPkg/Library/PciHostBridgeLib/XenSupport.c >>> +++ b/OvmfPkg/Library/PciHostBridgeLib/XenSupport.c >>> @@ -49,6 +49,22 @@ PcatPciRootBridgeBarExisted ( >>> EnableInterrupts (); >>> } >>> >>> +#define PCI_COMMAND_DECODE ((UINT16)(EFI_PCI_COMMAND_IO_SPACE | \ >>> + EFI_PCI_COMMAND_MEMORY_SPACE)) >>> +STATIC >>> +VOID >>> +PcatPciRootBridgeDecodingDisable ( >>> + IN UINTN Address >>> + ) >>> +{ >>> + UINT16 Value; >>> + >>> + Value = PciRead16 (Address); >>> + if (Value & PCI_COMMAND_DECODE) { >>> + PciWrite16 (Address, Value & ~(UINT32)PCI_COMMAND_DECODE); >>> + } >>> +} >>> + >>> STATIC >>> VOID >>> PcatPciRootBridgeParseBars ( >>> @@ -75,6 +91,11 @@ PcatPciRootBridgeParseBars ( >>> UINT64 Limit; >>> PCI_ROOT_BRIDGE_APERTURE *MemAperture; >>> >>> + // Disable address decoding for every device before OVMF starts sizing it >>> + PcatPciRootBridgeDecodingDisable ( >>> + PCI_LIB_ADDRESS (Bus, Device, Function, PCI_COMMAND_OFFSET) >>> + ); >>> + >>> for (Offset = BarOffsetBase; Offset < BarOffsetEnd; Offset += sizeof >>> (UINT32)) { >>> PcatPciRootBridgeBarExisted ( >>> PCI_LIB_ADDRESS (Bus, Device, Function, Offset), >>> >> >> Acked-by: Laszlo Ersek <lersek@xxxxxxxxxx> >> >> Someone from the Xen community please ACK this too, and then we can push >> the series. > > Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx> Series pushed as commit range 9fb2ce2f465d..0c40c9c925ca. Thanks Laszlo _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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