From: "Ankur Arora" <ankur.a.arora@oracle.com>
To: devel@edk2.groups.io
Cc: imammedo@redhat.com, lersek@redhat.com,
Ankur Arora <ankur.a.arora@oracle.com>,
Jordan Justen <jordan.l.justen@intel.com>,
Ard Biesheuvel <ard.biesheuvel@arm.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Aaron Young <aaron.young@oracle.com>
Subject: [PATCH v3 05/10] OvmfPkg/SmmCpuFeaturesLib: init CPU ejection state
Date: Thu, 14 Jan 2021 23:45:28 -0800 [thread overview]
Message-ID: <20210115074533.277448-6-ankur.a.arora@oracle.com> (raw)
In-Reply-To: <20210115074533.277448-1-ankur.a.arora@oracle.com>
Init CPU_HOT_EJECT_DATA, exposed via PcdCpuHotEjectDataAddress. This is
owned by PiSmmCpuDxeSmm, managed in OvmfPkg/SmmCpuFeaturesLib, and is
consumed in OvmfPkg/CpuHotPlugSmm which sets up CPU_HOT_EJECT_DATA->Handler
which handles the mechanics of CPU ejection.
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Aaron Young <aaron.young@oracle.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
.../Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c | 68 ++++++++++++++++++++++
.../SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf | 3 +
2 files changed, 71 insertions(+)
diff --git a/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c b/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c
index 7ef7ed98342e..5e7f2de25911 100644
--- a/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c
+++ b/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c
@@ -14,6 +14,7 @@
#include <Library/PcdLib.h>
#include <Library/SmmCpuFeaturesLib.h>
#include <Library/SmmServicesTableLib.h>
+#include <Library/MemoryAllocationLib.h> // AllocatePool()
#include <Library/UefiBootServicesTableLib.h>
#include <PiSmm.h>
#include <Register/Intel/SmramSaveStateMap.h>
@@ -171,6 +172,61 @@ SmmCpuFeaturesHookReturnFromSmm (
return OriginalInstructionPointer;
}
+//
+// The PCD corresponding to CPU_HOT_EJECT_DATA is owned by UefiCpuPkg
+// but we allocate and set it up here because it is needed from
+// SmmCpuFeaturesRendezvousExit() on all CPUs exiting SMI and
+// simultaneous PcdGet64() on multiple CPUs is not supported.
+//
+
+GLOBAL_REMOVE_IF_UNREFERENCED
+CPU_HOT_EJECT_DATA *mCpuHotEjectData;
+
+STATIC
+VOID
+EFIAPI
+SmmCpuFeaturesSmmInitHotEject(
+ VOID
+ )
+{
+ UINT32 mMaxNumberOfCpus;
+ EFI_STATUS Status;
+
+ if (!FeaturePcdGet (PcdCpuHotPlugSupport)) {
+ return;
+ }
+
+ // PcdCpuHotPlugSupport => PcdCpuMaxLogicalProcessorNumber
+ mMaxNumberOfCpus = PcdGet32 (PcdCpuMaxLogicalProcessorNumber);
+
+ // No spare CPUs to eject
+ if (mMaxNumberOfCpus == 1) {
+ return;
+ }
+
+ mCpuHotEjectData =
+ (CPU_HOT_EJECT_DATA *)AllocatePool (sizeof (*mCpuHotEjectData));
+ ASSERT (mCpuHotEjectData != NULL);
+
+ //
+ // Allocate buffer for pointers to array in CPU_HOT_EJECT_DATA.
+ //
+ mCpuHotEjectData->Revision = CPU_HOT_EJECT_DATA_REVISION_1; // Revision
+ mCpuHotEjectData->ArrayLength = mMaxNumberOfCpus; // Array Length of APIC ID
+ mCpuHotEjectData->ApicIdMap = // CpuIndex -> APIC ID map
+ (UINT64 *)AllocatePool (sizeof (UINT64) * mCpuHotEjectData->ArrayLength);
+ mCpuHotEjectData->Handler = NULL; // Hot Eject handler
+ mCpuHotEjectData->Handler = 0; // Reserved
+
+ ASSERT (mCpuHotEjectData->ApicIdMap != NULL);
+
+ //
+ // Expose address of CPU Hot eject Data structure
+ //
+ Status = PcdSet64S (PcdCpuHotEjectDataAddress, (UINT64)(VOID *)mCpuHotEjectData);
+ ASSERT_EFI_ERROR (Status);
+}
+
/**
Hook point in normal execution mode that allows the one CPU that was elected
as monarch during System Management Mode initialization to perform additional
@@ -188,6 +244,9 @@ SmmCpuFeaturesSmmRelocationComplete (
UINTN MapPagesBase;
UINTN MapPagesCount;
+
+ SmmCpuFeaturesSmmInitHotEject();
+
if (!MemEncryptSevIsEnabled ()) {
return;
}
@@ -375,6 +434,15 @@ SmmCpuFeaturesRendezvousExit (
IN UINTN CpuIndex
)
{
+ //
+ // CPU Hot eject not enabled.
+ //
+ if (mCpuHotEjectData == NULL ||
+ mCpuHotEjectData->Handler == NULL) {
+ return;
+ }
+
+ mCpuHotEjectData->Handler(CpuIndex);
}
/**
diff --git a/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf b/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf
index 97a10afb6e27..3043f02b2216 100644
--- a/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf
+++ b/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf
@@ -36,3 +36,6 @@
[Pcd]
gUefiOvmfPkgTokenSpaceGuid.PcdQ35SmramAtDefaultSmbase
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuHotPlugSupport
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuMaxLogicalProcessorNumber
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuHotEjectDataAddress
--
2.9.3
next prev parent reply other threads:[~2021-01-15 7:45 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-15 7:45 [PATCH v3 00/10] support CPU hot-unplug Ankur Arora
2021-01-15 7:45 ` [PATCH v3 01/10] OvmfPkg/CpuHotplugSmm: refactor hotplug logic Ankur Arora
2021-01-15 7:45 ` [PATCH v3 02/10] OvmfPkg/CpuHotplugSmm: collect hot-unplug events Ankur Arora
2021-01-15 7:45 ` [PATCH v3 03/10] OvmfPkg/CpuHotplugSmm: add Qemu Cpu Status helper Ankur Arora
2021-01-15 7:45 ` [PATCH v3 04/10] UefiCpuPkg: add CPU ejection support Ankur Arora
2021-01-15 8:17 ` [edk2-devel] " Laszlo Ersek
2021-01-15 18:16 ` Ankur Arora
2021-01-15 18:44 ` Laszlo Ersek
2021-01-15 19:22 ` Ankur Arora
2021-01-15 7:45 ` Ankur Arora [this message]
2021-01-15 7:45 ` [PATCH v3 06/10] OvmfPkg/CpuHotplugSmm: support CPU eject Ankur Arora
2021-01-15 7:45 ` [PATCH v3 07/10] OvmfPkg/CpuHotplugSmm: introduce UnplugCpus() Ankur Arora
2021-01-15 7:45 ` [PATCH v3 08/10] OvmfPkg/CpuHotplugSmm: add worker to do CPU ejection Ankur Arora
2021-01-15 7:45 ` [PATCH v3 09/10] OvmfPkg/SmmControl2Dxe: negotiate hot-unplug Ankur Arora
2021-01-15 7:45 ` [PATCH v3 10/10] MdePkg: use CpuPause() in CpuDeadLoop() Ankur Arora
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