[edk2-devel] [PATCH v9 00/10] support CPU hot-unplug
Laszlo Ersek
lersek at redhat.com
Tue Mar 16 14:07:33 UTC 2021
On 03/12/21 07:26, Ankur Arora wrote:
> Hi,
>
> This series adds OVMF support for CPU hot-unplug.
>
> QEMU secureboot hot-unplug logic corresponding to this is in upstream.
> Also posted here:
> https://lore.kernel.org/qemu-devel/20201207140739.3829993-1-imammedo@redhat.com/
>
> Testing (with QEMU 5.2.50):
> - Stable with randomized CPU plug/unplug (guest maxcpus=33,128)
> - Synthetic tests with simultaneous multi CPU hot-unplug
>
> Also at:
> github.com/terminus/edk2/ hot-unplug-v9
>
> Changelog:
>
> v9:
> - Rebased on top of edd46cd407ea
> - Clarify comments around memory-barriers in patches 7, 8, 9
> - Address other review comments from v8
Merged as commit range 4751a48aeb2a..f3bdfc41866e, via
<https://github.com/tianocore/edk2/pull/1494>, with the following R-b's
/ comments / light tweaks added:
> 1: 4b4466ed7c44 = 1: 0cb242e33693 OvmfPkg/CpuHotplugSmm: refactor hotplug logic
> 2: 719828efdebe ! 2: a752dd07466c OvmfPkg/CpuHotplugSmm: collect hot-unplug events
> @@ -20,6 +20,7 @@
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
> Signed-off-by: Ankur Arora <ankur.a.arora at oracle.com>
> Message-Id: <20210312062656.2477515-3-ankur.a.arora at oracle.com>
> + Reviewed-by: Laszlo Ersek <lersek at redhat.com>
>
> diff --git a/OvmfPkg/Include/IndustryStandard/QemuCpuHotplug.h b/OvmfPkg/Include/IndustryStandard/QemuCpuHotplug.h
> --- a/OvmfPkg/Include/IndustryStandard/QemuCpuHotplug.h
> 3: 7d732efcb7af = 3: 2d92e052c3af OvmfPkg/CpuHotplugSmm: add Qemu Cpu Status helper
> 4: 64649eeeee42 = 4: 15e6ae8ea400 OvmfPkg/CpuHotplugSmm: introduce UnplugCpus()
> 5: 7190a5d134a7 ! 5: 8ade9d425a6e OvmfPkg: define CPU_HOT_EJECT_DATA
> @@ -15,6 +15,7 @@
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
> Signed-off-by: Ankur Arora <ankur.a.arora at oracle.com>
> Message-Id: <20210312062656.2477515-6-ankur.a.arora at oracle.com>
> + Reviewed-by: Laszlo Ersek <lersek at redhat.com>
>
> diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
> --- a/OvmfPkg/OvmfPkg.dec
> 6: 1fd019dac476 ! 6: b6d5996706dd OvmfPkg/SmmCpuFeaturesLib: init CPU ejection state
> @@ -22,6 +22,7 @@
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
> Signed-off-by: Ankur Arora <ankur.a.arora at oracle.com>
> Message-Id: <20210312062656.2477515-7-ankur.a.arora at oracle.com>
> + Reviewed-by: Laszlo Ersek <lersek at redhat.com>
>
> diff --git a/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf b/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf
> --- a/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf
> 7: c8758d9b9764 ! 7: af9c77e151fa OvmfPkg/SmmCpuFeaturesLib: call CPU hot-eject handler
> @@ -19,6 +19,7 @@
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
> Signed-off-by: Ankur Arora <ankur.a.arora at oracle.com>
> Message-Id: <20210312062656.2477515-8-ankur.a.arora at oracle.com>
> + Reviewed-by: Laszlo Ersek <lersek at redhat.com>
>
> diff --git a/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c b/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c
> --- a/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c
> 8: 5ff8e8700678 ! 8: 30c69d2cfa63 OvmfPkg/CpuHotplugSmm: add EjectCpu()
> @@ -19,6 +19,7 @@
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
> Signed-off-by: Ankur Arora <ankur.a.arora at oracle.com>
> Message-Id: <20210312062656.2477515-9-ankur.a.arora at oracle.com>
> + Reviewed-by: Laszlo Ersek <lersek at redhat.com>
>
> diff --git a/OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf b/OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> --- a/OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
> 9: d6660f8f2f14 ! 9: f05328886302 OvmfPkg/CpuHotplugSmm: do actual CPU hot-eject
> @@ -27,6 +27,9 @@
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
> Signed-off-by: Ankur Arora <ankur.a.arora at oracle.com>
> Message-Id: <20210312062656.2477515-10-ankur.a.arora at oracle.com>
> + Reviewed-by: Laszlo Ersek <lersek at redhat.com>
> + [lersek at redhat.com: unneeded inner QemuSelector declaration in EjectCpu()
> + triggers VS warning #4456 (local variable shadowed); remove it]
>
> diff --git a/OvmfPkg/Include/IndustryStandard/QemuCpuHotplug.h b/OvmfPkg/Include/IndustryStandard/QemuCpuHotplug.h
> --- a/OvmfPkg/Include/IndustryStandard/QemuCpuHotplug.h
> @@ -102,8 +105,6 @@
> + UINT32 Idx;
> +
> + for (Idx = 0; Idx < mCpuHotEjectData->ArrayLength; Idx++) {
> -+ UINT64 QemuSelector;
> -+
> + QemuSelector = mCpuHotEjectData->QemuSelectorMap[Idx];
> +
> + if (QemuSelector != CPU_EJECT_QEMU_SELECTOR_INVALID) {
> 10: 0a9a1cd40b98 ! 10: f3bdfc41866e OvmfPkg/SmmControl2Dxe: negotiate CPU hot-unplug
> @@ -14,6 +14,9 @@
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
> Signed-off-by: Ankur Arora <ankur.a.arora at oracle.com>
> Message-Id: <20210312062656.2477515-11-ankur.a.arora at oracle.com>
> + [lersek at redhat.com: preserve the empty line between the ICH9_LPC_SMI_F_*
> + group of macro definitions and the SCRATCH_BUFFER type definition]
> + Reviewed-by: Laszlo Ersek <lersek at redhat.com>
>
> diff --git a/OvmfPkg/SmmControl2Dxe/SmiFeatures.c b/OvmfPkg/SmmControl2Dxe/SmiFeatures.c
> --- a/OvmfPkg/SmmControl2Dxe/SmiFeatures.c
> @@ -22,16 +25,15 @@
> // "etc/smi/supported-features" and "etc/smi/requested-features" fw_cfg files.
> //
> #define ICH9_LPC_SMI_F_CPU_HOTPLUG BIT1
> --
> +//
> +// The following bit value stands for "enable CPU hot-unplug, and inject an SMI
> +// with control value ICH9_APM_CNT_CPU_HOTPLUG upon hot-unplug", in the
> +// "etc/smi/supported-features" and "etc/smi/requested-features" fw_cfg files.
> +//
> +#define ICH9_LPC_SMI_F_CPU_HOT_UNPLUG BIT2
> +
> //
> // Provides a scratch buffer (allocated in EfiReservedMemoryType type memory)
> - // for the S3 boot script fragment to write to and read from.
> @@
> QemuFwCfgReadBytes (sizeof mSmiFeatures, &mSmiFeatures);
>
Thanks for the contribution,
Laszlo
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