On 08/13/19 13:31, Anthony PERARD wrote:
> 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>
> ---
>
> Notes:
> v5:
> - add missing PcdLib as #include and in [LibraryClasses]
http://mid.mail-archive.com/8a5d9e63-12f1-2ff8-7c40-773d15baf333@redhat.com
https://edk2.groups.io/g/devel/message/44622
The update looks good, thanks!
Laszlo
> v4:
> - Removed XenIoPvhDxeNotifyExitBoot() which was doing action that should
> not be done in an ExitBootServices notification.
> (InitializeXenIoPvhDxe() has been cleaned up following this.)
> - Use new PcdXenGrantFrames.
> - Some coding style fix
> - Update Maintainers.txt
>
> v3:
> - downgrade type to DXE_DRIVER
> - use SPDX
> - rework InitializeXenIoPvhDxe, and handle errors properly.
> - Free the reserved allocation in ExitBootServices even if the XenIo
> protocol could successfully been uninstalled.
>
> v2:
> - do allocation in EntryPoint like the other user of XenIoMmioLib.
> - allocate memory instead of hardcoded addr.
> - cleanup, add copyright
> - detect if we are running in PVH mode
>
> OvmfPkg/OvmfXen.dsc | 2 ++
> OvmfPkg/OvmfXen.fdf | 1 +
> OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf | 36 +++++++++++++++++++
> OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c | 54 +++++++++++++++++++++++++++++
> Maintainers.txt | 1 +
> 5 files changed, 94 insertions(+)
> create mode 100644 OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf
> create mode 100644 OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c
>
> diff --git a/OvmfPkg/OvmfXen.dsc b/OvmfPkg/OvmfXen.dsc
> index e719a168f8..5e07b37279 100644
> --- a/OvmfPkg/OvmfXen.dsc
> +++ b/OvmfPkg/OvmfXen.dsc
> @@ -195,6 +195,7 @@ [LibraryClasses]
> OrderedCollectionLib|MdePkg/Library/BaseOrderedCollectionRedBlackTreeLib/BaseOrderedCollectionRedBlackTreeLib.inf
> XenHypercallLib|OvmfPkg/Library/XenHypercallLib/XenHypercallLib.inf
> XenPlatformLib|OvmfPkg/Library/XenPlatformLib/XenPlatformLib.inf
> + XenIoMmioLib|OvmfPkg/Library/XenIoMmioLib/XenIoMmioLib.inf
>
> Tcg2PhysicalPresenceLib|OvmfPkg/Library/Tcg2PhysicalPresenceLibNull/DxeTcg2PhysicalPresenceLib.inf
> TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
> @@ -583,6 +584,7 @@ [Components]
> NULL|OvmfPkg/Csm/LegacyBootMaintUiLib/LegacyBootMaintUiLib.inf
> !endif
> }
> + OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf
> OvmfPkg/XenIoPciDxe/XenIoPciDxe.inf
> OvmfPkg/XenBusDxe/XenBusDxe.inf
> OvmfPkg/XenPvBlkDxe/XenPvBlkDxe.inf
> diff --git a/OvmfPkg/OvmfXen.fdf b/OvmfPkg/OvmfXen.fdf
> index 5c1a925d6a..517a492f14 100644
> --- a/OvmfPkg/OvmfXen.fdf
> +++ b/OvmfPkg/OvmfXen.fdf
> @@ -309,6 +309,7 @@ [FV.DXEFV]
> INF MdeModulePkg/Universal/Metronome/Metronome.inf
> INF PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcatRealTimeClockRuntimeDxe.inf
>
> +INF OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf
> INF OvmfPkg/XenIoPciDxe/XenIoPciDxe.inf
> INF OvmfPkg/XenBusDxe/XenBusDxe.inf
> INF OvmfPkg/XenPvBlkDxe/XenPvBlkDxe.inf
> diff --git a/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf b/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf
> new file mode 100644
> index 0000000000..1c27f8aae0
> --- /dev/null
> +++ b/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.inf
> @@ -0,0 +1,36 @@
> +## @file
> +# Driver for the XenIo protocol
> +#
> +# Copyright (c) 2019, Citrix Systems, Inc.
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +##
> +
> +[Defines]
> + INF_VERSION = 0x00010005
> + BASE_NAME = XenIoPvhDxe
> + FILE_GUID = 7a567cc4-0e75-4d7a-a305-c3db109b53ad
> + MODULE_TYPE = DXE_DRIVER
> + VERSION_STRING = 1.0
> + ENTRY_POINT = InitializeXenIoPvhDxe
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + OvmfPkg/OvmfPkg.dec
> +
> +[Sources]
> + XenIoPvhDxe.c
> +
> +[LibraryClasses]
> + MemoryAllocationLib
> + PcdLib
> + UefiDriverEntryPoint
> + XenIoMmioLib
> + XenPlatformLib
> +
> +[FixedPcd]
> + gUefiOvmfPkgTokenSpaceGuid.PcdXenGrantFrames
> +
> +[Depex]
> + TRUE
> diff --git a/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c b/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c
> new file mode 100644
> index 0000000000..9264a85df1
> --- /dev/null
> +++ b/OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c
> @@ -0,0 +1,54 @@
> +/** @file
> +
> + Driver for the XenIo protocol
> +
> + This driver simply allocate space for the grant tables.
> +
> + Copyright (c) 2019, Citrix Systems, Inc.
> +
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Library/MemoryAllocationLib.h>
> +#include <Library/PcdLib.h>
> +#include <Library/XenIoMmioLib.h>
> +#include <Library/XenPlatformLib.h>
> +
> +EFI_STATUS
> +EFIAPI
> +InitializeXenIoPvhDxe (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +{
> + VOID *Allocation;
> + EFI_STATUS Status;
> + EFI_HANDLE XenIoHandle;
> +
> + Allocation = NULL;
> + XenIoHandle = NULL;
> +
> + if (!XenPvhDetected ()) {
> + return EFI_UNSUPPORTED;
> + }
> +
> + Allocation = AllocateReservedPages (FixedPcdGet32 (PcdXenGrantFrames));
> + if (Allocation == NULL) {
> + Status = EFI_OUT_OF_RESOURCES;
> + goto Error;
> + }
> +
> + Status = XenIoMmioInstall (&XenIoHandle, (UINTN) Allocation);
> + if (EFI_ERROR (Status)) {
> + goto Error;
> + }
> +
> + return EFI_SUCCESS;
> +
> +Error:
> + if (Allocation != NULL) {
> + FreePages (Allocation, FixedPcdGet32 (PcdXenGrantFrames));
> + }
> + return Status;
> +}
> diff --git a/Maintainers.txt b/Maintainers.txt
> index 78e9f889ab..79defd13bf 100644
> --- a/Maintainers.txt
> +++ b/Maintainers.txt
> @@ -382,6 +382,7 @@ F: OvmfPkg/PlatformPei/Xen.*
> F: OvmfPkg/SmbiosPlatformDxe/*Xen.c
> F: OvmfPkg/XenBusDxe/
> F: OvmfPkg/XenIoPciDxe/
> +F: OvmfPkg/XenIoPvhDxe/
> F: OvmfPkg/XenPlatformPei/
> F: OvmfPkg/XenPvBlkDxe/
> F: OvmfPkg/XenResetVector/
>
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