OvmfPkg/CpuHotplugSmm: delay SMM exit #6138
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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 <[email protected]>
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RH-Author: Gerd Hoffmann <None> RH-MergeRequest: 74: OvmfPkg/CpuHotplugSmm: delay SMM exit RH-Jira: RHEL-56974 RH-Acked-by: Oliver Steffen <[email protected]> RH-Commit: [1/1] e1fb3f4db68457ec9f59ca5db47606bf4c34e6c5 (kraxel.rh/centos-src-edk2) 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 <[email protected]> upstream: submitted (tianocore#6138) patch_name: edk2-OvmfPkg-CpuHotplugSmm-delay-SMM-exit.patch present_in_specfile: true location_in_specfile: 44
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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 [email protected]