833cd3e0c0
XenIoPvhDxe use XenIoMmioLib to reserve some space to be use by the Grant Tables. The call is only done if it is necessary, we simply detect if the guest is PVH, as in this case there is currently no PCI bus, and no PCI Xen platform device which would start the XenIoPciDxe and allocate the space for the Grant Tables. Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689 Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20190813113119.14804-34-anthony.perard@citrix.com>
55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
/** @file
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Driver for the XenIo protocol
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This driver simply allocate space for the grant tables.
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Copyright (c) 2019, Citrix Systems, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/MemoryAllocationLib.h>
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#include <Library/PcdLib.h>
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#include <Library/XenIoMmioLib.h>
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#include <Library/XenPlatformLib.h>
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EFI_STATUS
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EFIAPI
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InitializeXenIoPvhDxe (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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VOID *Allocation;
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EFI_STATUS Status;
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EFI_HANDLE XenIoHandle;
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Allocation = NULL;
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XenIoHandle = NULL;
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if (!XenPvhDetected ()) {
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return EFI_UNSUPPORTED;
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}
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Allocation = AllocateReservedPages (FixedPcdGet32 (PcdXenGrantFrames));
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if (Allocation == NULL) {
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Status = EFI_OUT_OF_RESOURCES;
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goto Error;
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}
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Status = XenIoMmioInstall (&XenIoHandle, (UINTN) Allocation);
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if (EFI_ERROR (Status)) {
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goto Error;
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}
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return EFI_SUCCESS;
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Error:
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if (Allocation != NULL) {
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FreePages (Allocation, FixedPcdGet32 (PcdXenGrantFrames));
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}
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return Status;
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}
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