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OvmfPkg/CpuHotplugSmm: delay SMM exit

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Let APs wait until the BSP has completed the register updates to remove
the CPU.  This makes sure all APs stay in SMM mode until the CPU
hot-unplug operation is complete, which in turn makes sure the ACPI lock
is released only after the CPU hot-unplug operation is complete.

Some background:  The CPU hotplug SMI is triggered from an ACPI function
which is protected by an ACPI lock.  The ACPI function is in the ACPI
tables generated by qemu.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2024-08-29 09:20:29 +02:00 committed by mergify[bot]
parent ec18fa81d3
commit 121af960e2
1 changed files with 5 additions and 0 deletions
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5
OvmfPkg/CpuHotplugSmm/CpuHotplug.c
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@ -355,6 +355,11 @@ EjectCpu (
//
QemuSelector = mCpuHotEjectData->QemuSelectorMap[ProcessorNum];
if (QemuSelector == CPU_EJECT_QEMU_SELECTOR_INVALID) {
/* wait until BSP is done */
while (mCpuHotEjectData->Handler != NULL) {
CpuPause ();
}
return;
}