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47 lines
1.6 KiB
47 lines
1.6 KiB
2 days ago
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From 33ebaa6f0d476008ca6ba264657ac37faf63b723 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Thu, 29 Aug 2024 09:20:29 +0200
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Subject: [PATCH 1/2] OvmfPkg/CpuHotplugSmm: delay SMM exit
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RH-Author: Gerd Hoffmann <None>
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RH-MergeRequest: 74: OvmfPkg/CpuHotplugSmm: delay SMM exit
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RH-Jira: RHEL-56974
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RH-Acked-by: Oliver Steffen <osteffen@redhat.com>
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RH-Commit: [1/1] e1fb3f4db68457ec9f59ca5db47606bf4c34e6c5 (kraxel.rh/centos-src-edk2)
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Let APs wait until the BSP has completed the register updates to remove
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the CPU. This makes sure all APs stay in SMM mode until the CPU
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hot-unplug operation is complete, which in turn makes sure the ACPI lock
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is released only after the CPU hot-unplug operation is complete.
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Some background: The CPU hotplug SMI is triggered from an ACPI function
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which is protected by an ACPI lock. The ACPI function is in the ACPI
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tables generated by qemu.
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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upstream: submitted (https://github.com/tianocore/edk2/pull/6138)
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---
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OvmfPkg/CpuHotplugSmm/CpuHotplug.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/OvmfPkg/CpuHotplugSmm/CpuHotplug.c b/OvmfPkg/CpuHotplugSmm/CpuHotplug.c
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index d504163026..5af78211d3 100644
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--- a/OvmfPkg/CpuHotplugSmm/CpuHotplug.c
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+++ b/OvmfPkg/CpuHotplugSmm/CpuHotplug.c
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@@ -355,6 +355,11 @@ EjectCpu (
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//
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QemuSelector = mCpuHotEjectData->QemuSelectorMap[ProcessorNum];
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if (QemuSelector == CPU_EJECT_QEMU_SELECTOR_INVALID) {
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+ /* wait until BSP is done */
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+ while (mCpuHotEjectData->Handler != NULL) {
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+ CpuPause ();
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+ }
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+
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return;
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}
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--
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2.39.3
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