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OvmfPkg/CpuHotplugSmm: add function for collecting CPUs with events

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Add a function that collects the APIC IDs of CPUs that have just been
hot-plugged, or are about to be hot-unplugged.

Pending events are only located and never cleared; QEMU's AML needs the
firmware to leave the status bits intact in the hotplug register block.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1512
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20200226221156.29589-10-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Laszlo Ersek
2020-02-26 23:11:49 +01:00
committed by mergify[bot]
parent f668e78871
commit 763840c9ab
5 changed files with 211 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
OvmfPkg/CpuHotplugSmm/QemuCpuhp.h
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@@ -1,8 +1,8 @@
/** @file
Simple wrapper functions that access QEMU's modern CPU hotplug register
block.
Simple wrapper functions and utility functions that access QEMU's modern CPU
hotplug register block.
These functions thinly wrap some of the registers described in
These functions manipulate some of the registers described in
"docs/specs/acpi_cpu_hotplug.txt" in the QEMU source. IO Ports are accessed
via EFI_MM_CPU_IO_PROTOCOL. If a protocol call fails, these functions don't
return.
@@ -16,6 +16,9 @@
#define QEMU_CPUHP_H_
#include <Protocol/MmCpuIo.h> // EFI_MM_CPU_IO_PROTOCOL
#include <Uefi/UefiBaseType.h> // EFI_STATUS
#include "ApicId.h" // APIC_ID
UINT32
QemuCpuhpReadCommandData2 (
@@ -44,4 +47,15 @@ QemuCpuhpWriteCommand (
IN UINT8 Command
);
EFI_STATUS
QemuCpuhpCollectApicIds (
IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
IN UINT32 PossibleCpuCount,
IN UINT32 ApicIdCount,
OUT APIC_ID *PluggedApicIds,
OUT UINT32 *PluggedCount,
OUT APIC_ID *ToUnplugApicIds,
OUT UINT32 *ToUnplugCount
);
#endif // QEMU_CPUHP_H_