OvmfPkg: Introduce XenPlatformPei
Introduce XenPlatformPei, a copy of OvmfPkg/PlatformPei without some of QEMU specific initialization, Xen does not support QemuFwCfg. This new module will be adjusted to accommodate Xen PVH. fw_cfg dependents that have been removed, which are dynamically skipped when running PlatformPei on Xen: - GetFirstNonAddress(): controlling the 64-bit PCI MMIO aperture via the (experimental) "opt/ovmf/X-PciMmio64Mb" file - GetFirstNonAddress(): honoring the hotplug DIMM area ("etc/reserved-memory-end") in the placement of the 64-bit PCI MMIO aperture - NoexecDxeInitialization() is removed, so PcdPropertiesTableEnable and PcdSetNxForStack are left constant FALSE (not set dynamically from fw_cfg "opt/ovmf/PcdXxxx") - MaxCpuCountInitialization(), PublishPeiMemory(): the max CPU count is not taken from the QemuFwCfgItemSmpCpuCount fw_cfg key; PcdCpuMaxLogicalProcessorNumber is used intact and PcdCpuApInitTimeOutInMicroSeconds is never changed or used. - InitializeXenPlatform(), S3Verification(): S3 is assumed disabled (not consulting "etc/system-states" via QemuFwCfgS3Enabled()). - InstallFeatureControlCallback(): the feature control MSR is not set from "etc/msr_feature_control" (also removed FeatureControl.c as there is nothing been executed) Also removed: - SMRAM/TSEG-related low mem size adjusting (PcdSmmSmramRequire is assumed FALSE) in PublishPeiMemory(), - QemuInitializeRam() entirely, Xen related changes: - Have removed the module variable mXen, as it should be always true. - Have the platform PEI initialization fails if Xen has not been detected. 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: <20190813113119.14804-5-anthony.perard@citrix.com>
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committed by
Laszlo Ersek
parent
c05de360ec
commit
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219
OvmfPkg/XenPlatformPei/Xen.c
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OvmfPkg/XenPlatformPei/Xen.c
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/**@file
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Xen Platform PEI support
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Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2011, Andrei Warkentin <andreiw@motorola.com>
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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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//
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// The package level header files this module uses
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//
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#include <PiPei.h>
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//
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// The Library classes this module consumes
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//
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/PcdLib.h>
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#include <Guid/XenInfo.h>
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#include <IndustryStandard/E820.h>
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#include <Library/ResourcePublicationLib.h>
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#include <Library/MtrrLib.h>
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#include "Platform.h"
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#include "Xen.h"
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STATIC UINT32 mXenLeaf = 0;
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EFI_XEN_INFO mXenInfo;
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/**
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Returns E820 map provided by Xen
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@param Entries Pointer to E820 map
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@param Count Number of entries
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@return EFI_STATUS
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**/
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EFI_STATUS
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XenGetE820Map (
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EFI_E820_ENTRY64 **Entries,
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UINT32 *Count
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)
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{
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EFI_XEN_OVMF_INFO *Info =
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(EFI_XEN_OVMF_INFO *)(UINTN) OVMF_INFO_PHYSICAL_ADDRESS;
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if (AsciiStrCmp ((CHAR8 *) Info->Signature, "XenHVMOVMF")) {
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return EFI_NOT_FOUND;
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}
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ASSERT (Info->E820 < MAX_ADDRESS);
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*Entries = (EFI_E820_ENTRY64 *)(UINTN) Info->E820;
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*Count = Info->E820EntriesCount;
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return EFI_SUCCESS;
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}
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/**
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Connects to the Hypervisor.
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@param XenLeaf CPUID index used to connect.
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@return EFI_STATUS
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**/
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EFI_STATUS
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XenConnect (
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UINT32 XenLeaf
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)
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{
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UINT32 Index;
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UINT32 TransferReg;
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UINT32 TransferPages;
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UINT32 XenVersion;
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AsmCpuid (XenLeaf + 2, &TransferPages, &TransferReg, NULL, NULL);
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mXenInfo.HyperPages = AllocatePages (TransferPages);
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if (!mXenInfo.HyperPages) {
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return EFI_OUT_OF_RESOURCES;
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}
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for (Index = 0; Index < TransferPages; Index++) {
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AsmWriteMsr64 (TransferReg,
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(UINTN) mXenInfo.HyperPages +
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(Index << EFI_PAGE_SHIFT) + Index);
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}
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AsmCpuid (XenLeaf + 1, &XenVersion, NULL, NULL, NULL);
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DEBUG ((DEBUG_ERROR, "Detected Xen version %d.%d\n",
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XenVersion >> 16, XenVersion & 0xFFFF));
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mXenInfo.VersionMajor = (UINT16)(XenVersion >> 16);
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mXenInfo.VersionMinor = (UINT16)(XenVersion & 0xFFFF);
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/* TBD: Locate hvm_info and reserve it away. */
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mXenInfo.HvmInfo = NULL;
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BuildGuidDataHob (
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&gEfiXenInfoGuid,
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&mXenInfo,
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sizeof(mXenInfo)
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);
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return EFI_SUCCESS;
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}
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/**
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Figures out if we are running inside Xen HVM.
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@retval TRUE Xen was detected
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@retval FALSE Xen was not detected
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**/
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BOOLEAN
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XenDetect (
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VOID
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)
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{
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UINT8 Signature[13];
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if (mXenLeaf != 0) {
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return TRUE;
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}
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Signature[12] = '\0';
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for (mXenLeaf = 0x40000000; mXenLeaf < 0x40010000; mXenLeaf += 0x100) {
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AsmCpuid (mXenLeaf,
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NULL,
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(UINT32 *) &Signature[0],
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(UINT32 *) &Signature[4],
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(UINT32 *) &Signature[8]);
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if (!AsciiStrCmp ((CHAR8 *) Signature, "XenVMMXenVMM")) {
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return TRUE;
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}
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}
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mXenLeaf = 0;
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return FALSE;
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}
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VOID
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XenPublishRamRegions (
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VOID
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)
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{
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EFI_E820_ENTRY64 *E820Map;
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UINT32 E820EntriesCount;
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EFI_STATUS Status;
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DEBUG ((DEBUG_INFO, "Using memory map provided by Xen\n"));
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//
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// Parse RAM in E820 map
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//
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E820EntriesCount = 0;
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Status = XenGetE820Map (&E820Map, &E820EntriesCount);
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ASSERT_EFI_ERROR (Status);
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if (E820EntriesCount > 0) {
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EFI_E820_ENTRY64 *Entry;
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UINT32 Loop;
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for (Loop = 0; Loop < E820EntriesCount; Loop++) {
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Entry = E820Map + Loop;
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//
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// Only care about RAM
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//
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if (Entry->Type != EfiAcpiAddressRangeMemory) {
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continue;
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}
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AddMemoryBaseSizeHob (Entry->BaseAddr, Entry->Length);
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MtrrSetMemoryAttribute (Entry->BaseAddr, Entry->Length, CacheWriteBack);
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}
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}
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}
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/**
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Perform Xen PEI initialization.
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@return EFI_SUCCESS Xen initialized successfully
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@return EFI_NOT_FOUND Not running under Xen
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**/
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EFI_STATUS
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InitializeXen (
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VOID
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)
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{
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RETURN_STATUS PcdStatus;
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if (mXenLeaf == 0) {
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return EFI_NOT_FOUND;
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}
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XenConnect (mXenLeaf);
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//
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// Reserve away HVMLOADER reserved memory [0xFC000000,0xFD000000).
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// This needs to match HVMLOADER RESERVED_MEMBASE/RESERVED_MEMSIZE.
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//
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AddReservedMemoryBaseSizeHob (0xFC000000, 0x1000000, FALSE);
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PcdStatus = PcdSetBoolS (PcdPciDisableBusEnumeration, TRUE);
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ASSERT_RETURN_ERROR (PcdStatus);
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return EFI_SUCCESS;
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}
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