[edk2-devel] [PATCH v2 05/16] OvmfPkg: enable CPU hotplug support in PiSmmCpuDxeSmm

Laszlo Ersek lersek at redhat.com
Wed Feb 26 22:11:45 UTC 2020 

Set "PcdCpuHotPlugSupport" to TRUE, when OVMF is built with SMM_REQUIRE.
Consequences:

(1) In PiCpuSmmEntry() [UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c],
    resources are allocated and populated in advance for all possible
    (i.e., potentially hot-added) processors, rather than only the
    processors present at boot.

    The possible count (called "mMaxNumberOfCpus") is set from
    "PcdCpuMaxLogicalProcessorNumber"; we set the latter in
    OvmfPkg/PlatformPei. (Refer to commit 83357313dd67,
    "OvmfPkg/PlatformPei: rewrite MaxCpuCountInitialization() for CPU
    hotplug", 2020-01-29).

(2) The AddProcessor() and RemoveProcessor() member functions of
    EFI_SMM_CPU_SERVICE_PROTOCOL, implemented in
    "UefiCpuPkg/PiSmmCpuDxeSmm/CpuService.c", are no longer
    short-circuited to EFI_UNSUPPORTED.

    We'll rely on these functions in the CPU hotplug SMI handler, in a
    subsequent patch.

(3) In PiCpuSmmEntry(), the address of the CPU_HOT_PLUG_DATA structure (in
    SMRAM) is exposed via the dynamic-only "PcdCpuHotPlugDataAddress".

    This structure is an information channel between the CPU hotplug SMI
    handler, and EFI_SMM_CPU_SERVICE_PROTOCOL. Namely, at the first
    "Index" where the following equality holds:

      CPU_HOT_PLUG_DATA.ApicId[Index] == INVALID_APIC_ID

    a hot-plugged CPU can be accepted, with the steps below:

(3.1) The hotplug SMI handler has to overwrite INVALID_APIC_ID with the
      new CPU's APIC ID.

(3.2) The new CPU's SMBASE has to be relocated to:

        CPU_HOT_PLUG_DATA.SmBase[Index]

      (which was precomputed in step (1) above).

(3.3) The hotplug SMI handler is supposed to call
      EFI_SMM_CPU_SERVICE_PROTOCOL.AddProcessor().

Note: we need not spell out "PcdCpuHotPlugDataAddress" in the
[PcdsDynamicDefault] sections of the OVMF DSC files, just so the PCD
become dynamically settable. That's because "UefiCpuPkg.dec" declares this
PCD with [PcdsDynamic, PcdsDynamicEx] access methods *only*.

Cc: Ard Biesheuvel <ard.biesheuvel at linaro.org>
Cc: Igor Mammedov <imammedo at redhat.com>
Cc: Jiewen Yao <jiewen.yao at intel.com>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Michael Kinney <michael.d.kinney at intel.com>
Cc: Philippe Mathieu-Daudé <philmd at redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1512
Signed-off-by: Laszlo Ersek <lersek at redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
---

Notes:
    v2:
    
    - Pick up Ard's Acked-by, which is conditional on approval from Intel
      reviewers on Cc. (I'd like to save Ard the churn of re-acking
      unmodified patches.)

 OvmfPkg/OvmfPkgIa32.dsc    | 1 +
 OvmfPkg/OvmfPkgIa32X64.dsc | 1 +
 OvmfPkg/OvmfPkgX64.dsc     | 1 +
 3 files changed, 3 insertions(+)

diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 60d8af185b9c..8c065ca7cec9 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -414,44 +414,45 @@ [LibraryClasses.common.SMM_CORE]
 !endif
   PciLib|OvmfPkg/Library/DxePciLibI440FxQ35/DxePciLibI440FxQ35.inf
 
 ################################################################################
 #
 # Pcd Section - list of all EDK II PCD Entries defined by this Platform.
 #
 ################################################################################
 [PcdsFeatureFlag]
   gEfiMdeModulePkgTokenSpaceGuid.PcdHiiOsRuntimeSupport|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseSerial|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseMemory|TRUE
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSupportUefiDecompress|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSwitchToLongMode|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdConOutGopSupport|TRUE
   gEfiMdeModulePkgTokenSpaceGuid.PcdConOutUgaSupport|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdInstallAcpiSdtProtocol|TRUE
 !ifdef $(CSM_ENABLE)
   gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable|TRUE
 !endif
 !if $(SMM_REQUIRE) == TRUE
   gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire|TRUE
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuHotPlugSupport|TRUE
   gEfiMdeModulePkgTokenSpaceGuid.PcdEnableVariableRuntimeCache|FALSE
 !endif
 
 [PcdsFixedAtBuild]
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
   gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|FALSE
   gEfiMdePkgTokenSpaceGuid.PcdMaximumGuidedExtractHandler|0x10
 !if ($(FD_SIZE_IN_KB) == 1024) || ($(FD_SIZE_IN_KB) == 2048)
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize|0x2000
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxAuthVariableSize|0x2800
 !if $(NETWORK_TLS_ENABLE) == FALSE
   # match PcdFlashNvStorageVariableSize purely for convenience
   gEfiMdeModulePkgTokenSpaceGuid.PcdVariableStoreSize|0xe000
 !endif
 !endif
 !if $(FD_SIZE_IN_KB) == 4096
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize|0x8400
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxAuthVariableSize|0x8400
 !if $(NETWORK_TLS_ENABLE) == FALSE
   # match PcdFlashNvStorageVariableSize purely for convenience
   gEfiMdeModulePkgTokenSpaceGuid.PcdVariableStoreSize|0x40000
 !endif
diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
index be6bc7bd88a7..944b785e61a9 100644
--- a/OvmfPkg/OvmfPkgIa32X64.dsc
+++ b/OvmfPkg/OvmfPkgIa32X64.dsc
@@ -419,44 +419,45 @@ [LibraryClasses.common.SMM_CORE]
 !endif
   PciLib|OvmfPkg/Library/DxePciLibI440FxQ35/DxePciLibI440FxQ35.inf
 
 ################################################################################
 #
 # Pcd Section - list of all EDK II PCD Entries defined by this Platform.
 #
 ################################################################################
 [PcdsFeatureFlag]
   gEfiMdeModulePkgTokenSpaceGuid.PcdHiiOsRuntimeSupport|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseSerial|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseMemory|TRUE
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSupportUefiDecompress|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSwitchToLongMode|TRUE
   gEfiMdeModulePkgTokenSpaceGuid.PcdConOutGopSupport|TRUE
   gEfiMdeModulePkgTokenSpaceGuid.PcdConOutUgaSupport|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdInstallAcpiSdtProtocol|TRUE
 !ifdef $(CSM_ENABLE)
   gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable|TRUE
 !endif
 !if $(SMM_REQUIRE) == TRUE
   gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire|TRUE
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuHotPlugSupport|TRUE
   gEfiMdeModulePkgTokenSpaceGuid.PcdEnableVariableRuntimeCache|FALSE
 !endif
 
 [PcdsFixedAtBuild]
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
   gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|FALSE
   gEfiMdePkgTokenSpaceGuid.PcdMaximumGuidedExtractHandler|0x10
 !if ($(FD_SIZE_IN_KB) == 1024) || ($(FD_SIZE_IN_KB) == 2048)
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize|0x2000
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxAuthVariableSize|0x2800
 !if $(NETWORK_TLS_ENABLE) == FALSE
   # match PcdFlashNvStorageVariableSize purely for convenience
   gEfiMdeModulePkgTokenSpaceGuid.PcdVariableStoreSize|0xe000
 !endif
 !endif
 !if $(FD_SIZE_IN_KB) == 4096
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize|0x8400
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxAuthVariableSize|0x8400
 !if $(NETWORK_TLS_ENABLE) == FALSE
   # match PcdFlashNvStorageVariableSize purely for convenience
   gEfiMdeModulePkgTokenSpaceGuid.PcdVariableStoreSize|0x40000
 !endif
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index e258c474b60d..8de0f7179784 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -419,44 +419,45 @@ [LibraryClasses.common.SMM_CORE]
 !endif
   PciLib|OvmfPkg/Library/DxePciLibI440FxQ35/DxePciLibI440FxQ35.inf
 
 ################################################################################
 #
 # Pcd Section - list of all EDK II PCD Entries defined by this Platform.
 #
 ################################################################################
 [PcdsFeatureFlag]
   gEfiMdeModulePkgTokenSpaceGuid.PcdHiiOsRuntimeSupport|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseSerial|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeUseMemory|TRUE
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSupportUefiDecompress|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSwitchToLongMode|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdConOutGopSupport|TRUE
   gEfiMdeModulePkgTokenSpaceGuid.PcdConOutUgaSupport|FALSE
   gEfiMdeModulePkgTokenSpaceGuid.PcdInstallAcpiSdtProtocol|TRUE
 !ifdef $(CSM_ENABLE)
   gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable|TRUE
 !endif
 !if $(SMM_REQUIRE) == TRUE
   gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire|TRUE
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuHotPlugSupport|TRUE
   gEfiMdeModulePkgTokenSpaceGuid.PcdEnableVariableRuntimeCache|FALSE
 !endif
 
 [PcdsFixedAtBuild]
   gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1
   gEfiMdeModulePkgTokenSpaceGuid.PcdResetOnMemoryTypeInformationChange|FALSE
   gEfiMdePkgTokenSpaceGuid.PcdMaximumGuidedExtractHandler|0x10
 !if ($(FD_SIZE_IN_KB) == 1024) || ($(FD_SIZE_IN_KB) == 2048)
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize|0x2000
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxAuthVariableSize|0x2800
 !if $(NETWORK_TLS_ENABLE) == FALSE
   # match PcdFlashNvStorageVariableSize purely for convenience
   gEfiMdeModulePkgTokenSpaceGuid.PcdVariableStoreSize|0xe000
 !endif
 !endif
 !if $(FD_SIZE_IN_KB) == 4096
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize|0x8400
   gEfiMdeModulePkgTokenSpaceGuid.PcdMaxAuthVariableSize|0x8400
 !if $(NETWORK_TLS_ENABLE) == FALSE
   # match PcdFlashNvStorageVariableSize purely for convenience
   gEfiMdeModulePkgTokenSpaceGuid.PcdVariableStoreSize|0x40000
 !endif
-- 
2.19.1.3.g30247aa5d201



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