On Wed, 26 Feb 2020 at 23:12, Laszlo Ersek <ler...@redhat.com> wrote:
>
> Add a new SMM driver skeleton that registers a root SMI handler, and
> checks if the SMI control value (written to 0xB2) indicates a CPU hotplug
> SMI.
>
> QEMU's ACPI payload will cause the OS to raise a broadcast SMI when a CPU
> hotplug event occurs, namely by writing value 4 to IO Port 0xB2. In other
> words, control value 4 is now allocated for this purpose; introduce the
> ICH9_APM_CNT_CPU_HOTPLUG macro for it.
>
> The standard identifiers in this driver use the new MM (Management Mode)
> terminology from the PI spec, not the earlier SMM (System Management Mode)
> terms.
>
> Cc: Ard Biesheuvel <ard.biesheu...@linaro.org>
> Cc: Igor Mammedov <imamm...@redhat.com>
> Cc: Jiewen Yao <jiewen....@intel.com>
> Cc: Jordan Justen <jordan.l.jus...@intel.com>
> Cc: Michael Kinney <michael.d.kin...@intel.com>
> Cc: Philippe Mathieu-Daudé <phi...@redhat.com>
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1512
> Signed-off-by: Laszlo Ersek <ler...@redhat.com>
> Acked-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheu...@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 +
> OvmfPkg/OvmfPkgIa32.fdf | 1 +
> OvmfPkg/OvmfPkgIa32X64.fdf | 1 +
> OvmfPkg/OvmfPkgX64.fdf | 1 +
> OvmfPkg/Include/IndustryStandard/Q35MchIch9.h | 5 +-
> OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf | 48 +++++
> OvmfPkg/CpuHotplugSmm/CpuHotplug.c | 191 ++++++++++++++++++++
> 9 files changed, 248 insertions(+), 2 deletions(-)
>
> diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
> index 8c065ca7cec9..78310da44a5f 100644
> --- a/OvmfPkg/OvmfPkgIa32.dsc
> +++ b/OvmfPkg/OvmfPkgIa32.dsc
> @@ -851,44 +851,45 @@ [Components]
>
> OvmfPkg/PlatformDxe/Platform.inf
> OvmfPkg/IoMmuDxe/IoMmuDxe.inf
>
> !if $(SMM_REQUIRE) == TRUE
> OvmfPkg/SmmAccess/SmmAccess2Dxe.inf
> OvmfPkg/SmmControl2Dxe/SmmControl2Dxe.inf
> UefiCpuPkg/CpuS3DataDxe/CpuS3DataDxe.inf
>
> #
> # SMM Initial Program Load (a DXE_RUNTIME_DRIVER)
> #
> MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf
>
> #
> # SMM_CORE
> #
> MdeModulePkg/Core/PiSmmCore/PiSmmCore.inf
>
> #
> # Privileged drivers (DXE_SMM_DRIVER modules)
> #
> + OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> UefiCpuPkg/CpuIo2Smm/CpuIo2Smm.inf
> MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.inf {
> <LibraryClasses>
> LockBoxLib|MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.inf
> }
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf {
> <LibraryClasses>
>
> SmmCpuPlatformHookLib|OvmfPkg/Library/SmmCpuPlatformHookLibQemu/SmmCpuPlatformHookLibQemu.inf
>
> SmmCpuFeaturesLib|OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf
> }
>
> #
> # Variable driver stack (SMM)
> #
> OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbServicesSmm.inf
> MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.inf
> MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf {
> <LibraryClasses>
> NULL|MdeModulePkg/Library/VarCheckUefiLib/VarCheckUefiLib.inf
> }
> MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.inf
>
> diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
> index 944b785e61a9..428578a4f839 100644
> --- a/OvmfPkg/OvmfPkgIa32X64.dsc
> +++ b/OvmfPkg/OvmfPkgIa32X64.dsc
> @@ -865,44 +865,45 @@ [Components.X64]
> OvmfPkg/PlatformDxe/Platform.inf
> OvmfPkg/AmdSevDxe/AmdSevDxe.inf
> OvmfPkg/IoMmuDxe/IoMmuDxe.inf
>
> !if $(SMM_REQUIRE) == TRUE
> OvmfPkg/SmmAccess/SmmAccess2Dxe.inf
> OvmfPkg/SmmControl2Dxe/SmmControl2Dxe.inf
> UefiCpuPkg/CpuS3DataDxe/CpuS3DataDxe.inf
>
> #
> # SMM Initial Program Load (a DXE_RUNTIME_DRIVER)
> #
> MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf
>
> #
> # SMM_CORE
> #
> MdeModulePkg/Core/PiSmmCore/PiSmmCore.inf
>
> #
> # Privileged drivers (DXE_SMM_DRIVER modules)
> #
> + OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> UefiCpuPkg/CpuIo2Smm/CpuIo2Smm.inf
> MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.inf {
> <LibraryClasses>
> LockBoxLib|MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.inf
> }
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf {
> <LibraryClasses>
>
> SmmCpuPlatformHookLib|OvmfPkg/Library/SmmCpuPlatformHookLibQemu/SmmCpuPlatformHookLibQemu.inf
>
> SmmCpuFeaturesLib|OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf
> }
>
> #
> # Variable driver stack (SMM)
> #
> OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbServicesSmm.inf
> MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.inf
> MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf {
> <LibraryClasses>
> NULL|MdeModulePkg/Library/VarCheckUefiLib/VarCheckUefiLib.inf
> }
> MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.inf
>
> diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
> index 8de0f7179784..73b92f259201 100644
> --- a/OvmfPkg/OvmfPkgX64.dsc
> +++ b/OvmfPkg/OvmfPkgX64.dsc
> @@ -863,44 +863,45 @@ [Components]
> OvmfPkg/PlatformDxe/Platform.inf
> OvmfPkg/AmdSevDxe/AmdSevDxe.inf
> OvmfPkg/IoMmuDxe/IoMmuDxe.inf
>
> !if $(SMM_REQUIRE) == TRUE
> OvmfPkg/SmmAccess/SmmAccess2Dxe.inf
> OvmfPkg/SmmControl2Dxe/SmmControl2Dxe.inf
> UefiCpuPkg/CpuS3DataDxe/CpuS3DataDxe.inf
>
> #
> # SMM Initial Program Load (a DXE_RUNTIME_DRIVER)
> #
> MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf
>
> #
> # SMM_CORE
> #
> MdeModulePkg/Core/PiSmmCore/PiSmmCore.inf
>
> #
> # Privileged drivers (DXE_SMM_DRIVER modules)
> #
> + OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> UefiCpuPkg/CpuIo2Smm/CpuIo2Smm.inf
> MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.inf {
> <LibraryClasses>
> LockBoxLib|MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.inf
> }
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf {
> <LibraryClasses>
>
> SmmCpuPlatformHookLib|OvmfPkg/Library/SmmCpuPlatformHookLibQemu/SmmCpuPlatformHookLibQemu.inf
>
> SmmCpuFeaturesLib|OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf
> }
>
> #
> # Variable driver stack (SMM)
> #
> OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbServicesSmm.inf
> MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.inf
> MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf {
> <LibraryClasses>
> NULL|MdeModulePkg/Library/VarCheckUefiLib/VarCheckUefiLib.inf
> }
> MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.inf
>
> diff --git a/OvmfPkg/OvmfPkgIa32.fdf b/OvmfPkg/OvmfPkgIa32.fdf
> index 63607551ed75..61b891765c56 100644
> --- a/OvmfPkg/OvmfPkgIa32.fdf
> +++ b/OvmfPkg/OvmfPkgIa32.fdf
> @@ -301,44 +301,45 @@ [FV.DXEFV]
> INF MdeModulePkg/Bus/Usb/UsbKbDxe/UsbKbDxe.inf
> INF MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassStorageDxe.inf
>
> !ifdef $(CSM_ENABLE)
> INF OvmfPkg/Csm/BiosThunk/VideoDxe/VideoDxe.inf
> INF OvmfPkg/Csm/LegacyBiosDxe/LegacyBiosDxe.inf
> INF RuleOverride=CSM OvmfPkg/Csm/Csm16/Csm16.inf
> !else
> INF OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf
> !endif
>
> INF OvmfPkg/QemuRamfbDxe/QemuRamfbDxe.inf
> INF OvmfPkg/VirtioGpuDxe/VirtioGpu.inf
> INF OvmfPkg/PlatformDxe/Platform.inf
> INF OvmfPkg/IoMmuDxe/IoMmuDxe.inf
>
> !if $(SMM_REQUIRE) == TRUE
> INF OvmfPkg/SmmAccess/SmmAccess2Dxe.inf
> INF OvmfPkg/SmmControl2Dxe/SmmControl2Dxe.inf
> INF UefiCpuPkg/CpuS3DataDxe/CpuS3DataDxe.inf
> INF MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf
> INF MdeModulePkg/Core/PiSmmCore/PiSmmCore.inf
> +INF OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> INF UefiCpuPkg/CpuIo2Smm/CpuIo2Smm.inf
> INF MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.inf
> INF UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
>
> #
> # Variable driver stack (SMM)
> #
> INF OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbServicesSmm.inf
> INF MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.inf
> INF MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf
> INF MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.inf
>
> !else
>
> #
> # Variable driver stack (non-SMM)
> #
> INF OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbServicesRuntimeDxe.inf
> INF OvmfPkg/EmuVariableFvbRuntimeDxe/Fvb.inf
> INF MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteDxe.inf
> INF MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf
> !endif
> diff --git a/OvmfPkg/OvmfPkgIa32X64.fdf b/OvmfPkg/OvmfPkgIa32X64.fdf
> index 0488e5d95ffe..501b4fcb7b67 100644
> --- a/OvmfPkg/OvmfPkgIa32X64.fdf
> +++ b/OvmfPkg/OvmfPkgIa32X64.fdf
> @@ -308,44 +308,45 @@ [FV.DXEFV]
> INF MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassStorageDxe.inf
>
> !ifdef $(CSM_ENABLE)
> INF OvmfPkg/Csm/BiosThunk/VideoDxe/VideoDxe.inf
> INF OvmfPkg/Csm/LegacyBiosDxe/LegacyBiosDxe.inf
> INF RuleOverride=CSM OvmfPkg/Csm/Csm16/Csm16.inf
> !else
> INF OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf
> !endif
>
> INF OvmfPkg/QemuRamfbDxe/QemuRamfbDxe.inf
> INF OvmfPkg/VirtioGpuDxe/VirtioGpu.inf
> INF OvmfPkg/PlatformDxe/Platform.inf
> INF OvmfPkg/AmdSevDxe/AmdSevDxe.inf
> INF OvmfPkg/IoMmuDxe/IoMmuDxe.inf
>
> !if $(SMM_REQUIRE) == TRUE
> INF OvmfPkg/SmmAccess/SmmAccess2Dxe.inf
> INF OvmfPkg/SmmControl2Dxe/SmmControl2Dxe.inf
> INF UefiCpuPkg/CpuS3DataDxe/CpuS3DataDxe.inf
> INF MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf
> INF MdeModulePkg/Core/PiSmmCore/PiSmmCore.inf
> +INF OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> INF UefiCpuPkg/CpuIo2Smm/CpuIo2Smm.inf
> INF MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.inf
> INF UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
>
> #
> # Variable driver stack (SMM)
> #
> INF OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbServicesSmm.inf
> INF MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.inf
> INF MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf
> INF MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.inf
>
> !else
>
> #
> # Variable driver stack (non-SMM)
> #
> INF OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbServicesRuntimeDxe.inf
> INF OvmfPkg/EmuVariableFvbRuntimeDxe/Fvb.inf
> INF MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteDxe.inf
> INF MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf
> !endif
> diff --git a/OvmfPkg/OvmfPkgX64.fdf b/OvmfPkg/OvmfPkgX64.fdf
> index 0488e5d95ffe..501b4fcb7b67 100644
> --- a/OvmfPkg/OvmfPkgX64.fdf
> +++ b/OvmfPkg/OvmfPkgX64.fdf
> @@ -308,44 +308,45 @@ [FV.DXEFV]
> INF MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassStorageDxe.inf
>
> !ifdef $(CSM_ENABLE)
> INF OvmfPkg/Csm/BiosThunk/VideoDxe/VideoDxe.inf
> INF OvmfPkg/Csm/LegacyBiosDxe/LegacyBiosDxe.inf
> INF RuleOverride=CSM OvmfPkg/Csm/Csm16/Csm16.inf
> !else
> INF OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf
> !endif
>
> INF OvmfPkg/QemuRamfbDxe/QemuRamfbDxe.inf
> INF OvmfPkg/VirtioGpuDxe/VirtioGpu.inf
> INF OvmfPkg/PlatformDxe/Platform.inf
> INF OvmfPkg/AmdSevDxe/AmdSevDxe.inf
> INF OvmfPkg/IoMmuDxe/IoMmuDxe.inf
>
> !if $(SMM_REQUIRE) == TRUE
> INF OvmfPkg/SmmAccess/SmmAccess2Dxe.inf
> INF OvmfPkg/SmmControl2Dxe/SmmControl2Dxe.inf
> INF UefiCpuPkg/CpuS3DataDxe/CpuS3DataDxe.inf
> INF MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf
> INF MdeModulePkg/Core/PiSmmCore/PiSmmCore.inf
> +INF OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> INF UefiCpuPkg/CpuIo2Smm/CpuIo2Smm.inf
> INF MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.inf
> INF UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
>
> #
> # Variable driver stack (SMM)
> #
> INF OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbServicesSmm.inf
> INF MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.inf
> INF MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf
> INF MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.inf
>
> !else
>
> #
> # Variable driver stack (non-SMM)
> #
> INF OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbServicesRuntimeDxe.inf
> INF OvmfPkg/EmuVariableFvbRuntimeDxe/Fvb.inf
> INF MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteDxe.inf
> INF MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf
> !endif
> diff --git a/OvmfPkg/Include/IndustryStandard/Q35MchIch9.h
> b/OvmfPkg/Include/IndustryStandard/Q35MchIch9.h
> index cb705fee92ca..73db4b59a111 100644
> --- a/OvmfPkg/Include/IndustryStandard/Q35MchIch9.h
> +++ b/OvmfPkg/Include/IndustryStandard/Q35MchIch9.h
> @@ -90,37 +90,38 @@
> #define POWER_MGMT_REGISTER_Q35(Offset) \
> PCI_LIB_ADDRESS (0, 0x1f, 0, (Offset))
>
> #define POWER_MGMT_REGISTER_Q35_EFI_PCI_ADDRESS(Offset) \
> EFI_PCI_ADDRESS (0, 0x1f, 0, (Offset))
>
> #define ICH9_PMBASE 0x40
> #define ICH9_PMBASE_MASK (BIT15 | BIT14 | BIT13 | BIT12 | BIT11 |
> \
> BIT10 | BIT9 | BIT8 | BIT7)
>
> #define ICH9_ACPI_CNTL 0x44
> #define ICH9_ACPI_CNTL_ACPI_EN BIT7
>
> #define ICH9_GEN_PMCON_1 0xA0
> #define ICH9_GEN_PMCON_1_SMI_LOCK BIT4
>
> #define ICH9_RCBA 0xF0
> #define ICH9_RCBA_EN BIT0
>
> //
> // IO ports
> //
> -#define ICH9_APM_CNT 0xB2
> -#define ICH9_APM_STS 0xB3
> +#define ICH9_APM_CNT 0xB2
> +#define ICH9_APM_CNT_CPU_HOTPLUG 0x04
> +#define ICH9_APM_STS 0xB3
>
> #define ICH9_CPU_HOTPLUG_BASE 0x0CD8
>
> //
> // IO ports relative to PMBASE
> //
> #define ICH9_PMBASE_OFS_SMI_EN 0x30
> #define ICH9_SMI_EN_APMC_EN BIT5
> #define ICH9_SMI_EN_GBL_SMI_EN BIT0
>
> #define ICH9_ROOT_COMPLEX_BASE 0xFED1C000
>
> #endif
> diff --git a/OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> b/OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> new file mode 100644
> index 000000000000..fa70858a8dab
> --- /dev/null
> +++ b/OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> @@ -0,0 +1,48 @@
> +## @file
> +# Root SMI handler for VCPU hotplug SMIs.
> +#
> +# Copyright (c) 2020, Red Hat, Inc.
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +##
> +
> +[Defines]
> + INF_VERSION = 1.29
> + PI_SPECIFICATION_VERSION = 0x00010046 #
> PI-1.7.0
> + BASE_NAME = CpuHotplugSmm
> + FILE_GUID = 84EEA114-C6BE-4445-8F90-51D97863E363
> + MODULE_TYPE = DXE_SMM_DRIVER
> + ENTRY_POINT = CpuHotplugEntry
> +
> +#
> +# The following information is for reference only and not required by the
> build
> +# tools.
> +#
> +# VALID_ARCHITECTURES = IA32 X64
> +#
> +
> +[Sources]
> + CpuHotplug.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + OvmfPkg/OvmfPkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> + DebugLib
> + MmServicesTableLib
> + PcdLib
> + UefiDriverEntryPoint
> +
> +[Protocols]
> + gEfiMmCpuIoProtocolGuid ##
> CONSUMES
> +
> +[Pcd]
> + gUefiOvmfPkgTokenSpaceGuid.PcdQ35SmramAtDefaultSmbase ##
> CONSUMES
> +
> +[FeaturePcd]
> + gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire ##
> CONSUMES
> +
> +[Depex]
> + gEfiMmCpuIoProtocolGuid
> diff --git a/OvmfPkg/CpuHotplugSmm/CpuHotplug.c
> b/OvmfPkg/CpuHotplugSmm/CpuHotplug.c
> new file mode 100644
> index 000000000000..fd09403eabf3
> --- /dev/null
> +++ b/OvmfPkg/CpuHotplugSmm/CpuHotplug.c
> @@ -0,0 +1,191 @@
> +/** @file
> + Root SMI handler for VCPU hotplug SMIs.
> +
> + Copyright (c) 2020, Red Hat, Inc.
> +
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +**/
> +
> +#include <IndustryStandard/Q35MchIch9.h> // ICH9_APM_CNT
> +#include <Library/BaseLib.h> // CpuDeadLoop()
> +#include <Library/DebugLib.h> // ASSERT()
> +#include <Library/MmServicesTableLib.h> // gMmst
> +#include <Library/PcdLib.h> // PcdGetBool()
> +#include <Protocol/MmCpuIo.h> // EFI_MM_CPU_IO_PROTOCOL
> +#include <Uefi/UefiBaseType.h> // EFI_STATUS
> +
> +//
> +// We use this protocol for accessing IO Ports.
> +//
> +STATIC EFI_MM_CPU_IO_PROTOCOL *mMmCpuIo;
> +//
> +// Represents the registration of the CPU Hotplug MMI handler.
> +//
> +STATIC EFI_HANDLE mDispatchHandle;
> +
> +
> +/**
> + CPU Hotplug MMI handler function.
> +
> + This is a root MMI handler.
> +
> + @param[in] DispatchHandle The unique handle assigned to this handler
> by
> + EFI_MM_SYSTEM_TABLE.MmiHandlerRegister().
> +
> + @param[in] Context Context passed in by
> + EFI_MM_SYSTEM_TABLE.MmiManage(). Due to
> + CpuHotplugMmi() being a root MMI handler,
> + Context is ASSERT()ed to be NULL.
> +
> + @param[in,out] CommBuffer Ignored, due to CpuHotplugMmi() being a root
> + MMI handler.
> +
> + @param[in,out] CommBufferSize Ignored, due to CpuHotplugMmi() being a root
> + MMI handler.
> +
> + @retval EFI_SUCCESS The MMI was handled and the MMI
> + source was quiesced. When
> returned
> + by a non-root MMI handler,
> + EFI_SUCCESS terminates the
> + processing of MMI handlers in
> + EFI_MM_SYSTEM_TABLE.MmiManage().
> + For a root MMI handler (i.e., for
> + the present function too),
> + EFI_SUCCESS behaves identically
> to
> +
> EFI_WARN_INTERRUPT_SOURCE_QUIESCED,
> + as further root MMI handlers are
> + going to be called by
> + EFI_MM_SYSTEM_TABLE.MmiManage()
> + anyway.
> +
> + @retval EFI_WARN_INTERRUPT_SOURCE_QUIESCED The MMI source has been
> quiesced,
> + but other handlers should still
> + be called.
> +
> + @retval EFI_WARN_INTERRUPT_SOURCE_PENDING The MMI source is still
> pending,
> + and other handlers should still
> + be called.
> +
> + @retval EFI_INTERRUPT_PENDING The MMI source could not be
> + quiesced.
> +**/
> +STATIC
> +EFI_STATUS
> +EFIAPI
> +CpuHotplugMmi (
> + IN EFI_HANDLE DispatchHandle,
> + IN CONST VOID *Context OPTIONAL,
> + IN OUT VOID *CommBuffer OPTIONAL,
> + IN OUT UINTN *CommBufferSize OPTIONAL
> + )
> +{
> + EFI_STATUS Status;
> + UINT8 ApmControl;
> +
> + //
> + // Assert that we are entering this function due to our root MMI handler
> + // registration.
> + //
> + ASSERT (DispatchHandle == mDispatchHandle);
> + //
> + // When MmiManage() is invoked to process root MMI handlers, the caller
> (the
> + // MM Core) is expected to pass in a NULL Context. MmiManage() then passes
> + // the same NULL Context to individual handlers.
> + //
> + ASSERT (Context == NULL);
> + //
> + // Read the MMI command value from the APM Control Port, to see if this is
> an
> + // MMI we should care about.
> + //
> + Status = mMmCpuIo->Io.Read (mMmCpuIo, MM_IO_UINT8, ICH9_APM_CNT, 1,
> + &ApmControl);
> + if (EFI_ERROR (Status)) {
> + DEBUG ((DEBUG_ERROR, "%a: failed to read ICH9_APM_CNT: %r\n",
> __FUNCTION__,
> + Status));
> + //
> + // We couldn't even determine if the MMI was for us or not.
> + //
> + goto Fatal;
> + }
> +
> + if (ApmControl != ICH9_APM_CNT_CPU_HOTPLUG) {
> + //
> + // The MMI is not for us.
> + //
> + return EFI_WARN_INTERRUPT_SOURCE_QUIESCED;
> + }
> +
> + //
> + // We've handled this MMI.
> + //
> + return EFI_SUCCESS;
> +
> +Fatal:
> + ASSERT (FALSE);
> + CpuDeadLoop ();
> + //
> + // We couldn't handle this MMI.
> + //
> + return EFI_INTERRUPT_PENDING;
> +}
> +
> +
> +//
> +// Entry point function of this driver.
> +//
> +EFI_STATUS
> +EFIAPI
> +CpuHotplugEntry (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +{
> + EFI_STATUS Status;
> +
> + //
> + // This module should only be included when SMM support is required.
> + //
> + ASSERT (FeaturePcdGet (PcdSmmSmramRequire));
> + //
> + // This driver depends on the dynamically detected "SMRAM at default
> SMBASE"
> + // feature.
> + //
> + if (!PcdGetBool (PcdQ35SmramAtDefaultSmbase)) {
> + return EFI_UNSUPPORTED;
> + }
> +
> + //
> + // Errors from here on are fatal; we cannot allow the boot to proceed if we
> + // can't set up this driver to handle CPU hotplug.
> + //
> + // First, collect the protocols needed later. All of these protocols are
> + // listed in our module DEPEX.
> + //
> + Status = gMmst->MmLocateProtocol (&gEfiMmCpuIoProtocolGuid,
> + NULL /* Registration */, (VOID **)&mMmCpuIo);
> + if (EFI_ERROR (Status)) {
> + DEBUG ((DEBUG_ERROR, "%a: locate MmCpuIo: %r\n", __FUNCTION__, Status));
> + goto Fatal;
> + }
> +
> + //
> + // Register the handler for the CPU Hotplug MMI.
> + //
> + Status = gMmst->MmiHandlerRegister (
> + CpuHotplugMmi,
> + NULL, // HandlerType: root MMI handler
> + &mDispatchHandle
> + );
> + if (EFI_ERROR (Status)) {
> + DEBUG ((DEBUG_ERROR, "%a: MmiHandlerRegister(): %r\n", __FUNCTION__,
> + Status));
> + goto Fatal;
> + }
> +
> + return EFI_SUCCESS;
> +
> +Fatal:
> + ASSERT (FALSE);
> + CpuDeadLoop ();
> + return Status;
> +}
> --
> 2.19.1.3.g30247aa5d201
>
>
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