Add QemuCpuhpWriteCpuStatus() which will be used to update the QEMU
CPU status register. On error, it hangs in a similar fashion as
other helper functions.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Aaron Young <aaron.young@oracle.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---

Notes:
    Address this review comment:
     () Move QemuCpuhpWriteCpuStatus() (declaration and definition) between
      QemuCpuhpWriteCpuSelector() and QemuCpuhpWriteCommand() to match
      the order of the register descriptions in QEMU.

 OvmfPkg/CpuHotplugSmm/QemuCpuhp.h |  6 ++++++
 OvmfPkg/CpuHotplugSmm/QemuCpuhp.c | 22 ++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/OvmfPkg/CpuHotplugSmm/QemuCpuhp.h b/OvmfPkg/CpuHotplugSmm/QemuCpuhp.h
index 1e23b150910e..859412c1a173 100644
--- a/OvmfPkg/CpuHotplugSmm/QemuCpuhp.h
+++ b/OvmfPkg/CpuHotplugSmm/QemuCpuhp.h
@@ -42,6 +42,12 @@ QemuCpuhpWriteCpuSelector (
   );
 
 VOID
+QemuCpuhpWriteCpuStatus (
+  IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
+  IN UINT8                        CpuStatus
+  );
+
+VOID
 QemuCpuhpWriteCommand (
   IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
   IN UINT8                        Command
diff --git a/OvmfPkg/CpuHotplugSmm/QemuCpuhp.c b/OvmfPkg/CpuHotplugSmm/QemuCpuhp.c
index 36372a5e6193..9434bb14dd4e 100644
--- a/OvmfPkg/CpuHotplugSmm/QemuCpuhp.c
+++ b/OvmfPkg/CpuHotplugSmm/QemuCpuhp.c
@@ -114,6 +114,28 @@ QemuCpuhpWriteCpuSelector (
 }
 
 VOID
+QemuCpuhpWriteCpuStatus (
+  IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
+  IN UINT8                        CpuStatus
+  )
+{
+  EFI_STATUS Status;
+
+  Status = MmCpuIo->Io.Write (
+                         MmCpuIo,
+                         MM_IO_UINT8,
+                         ICH9_CPU_HOTPLUG_BASE + QEMU_CPUHP_R_CPU_STAT,
+                         1,
+                         &CpuStatus
+                         );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: %r\n", __FUNCTION__, Status));
+    ASSERT (FALSE);
+    CpuDeadLoop ();
+  }
+}
+
+VOID
 QemuCpuhpWriteCommand (
   IN CONST EFI_MM_CPU_IO_PROTOCOL *MmCpuIo,
   IN UINT8                        Command
-- 
2.9.3



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