From dd48ac51d1df4f718b4401b188d2824aebcc341c Mon Sep 17 00:00:00 2001

From: Laszlo Ersek <lersek@redhat.com>

Date: Wed, 26 Nov 2014 16:32:06 +0100

Subject: [PATCH] OvmfPkg: disable multi-processor support for boot time

We have no useful workload for APs, so let's not start them up, because

they would spin indefinitely until ExitBootServices().

Setting gUefiCpuPkgTokenSpaceGuid.PcdCpuMaxLogicalProcessorNumber to 1

causes InitializeMpSupport() in "UefiCpuPkg/CpuDxe/CpuMp.c" to return

early.

Contributed-under: TianoCore Contribution Agreement 1.0

Signed-off-by: Laszlo Ersek <lersek@redhat.com>

---

 OvmfPkg/OvmfPkgIa32.dsc    | 4 ++++

 OvmfPkg/OvmfPkgIa32X64.dsc | 4 ++++

 OvmfPkg/OvmfPkgX64.dsc     | 4 ++++

 3 files changed, 12 insertions(+)

diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc

index 6598102..1730812 100644

--- a/OvmfPkg/OvmfPkgIa32.dsc

+++ b/OvmfPkg/OvmfPkgIa32.dsc

@@ -329,6 +329,10 @@

   # IRQs 5, 9, 10, 11 are level-triggered

   gPcAtChipsetPkgTokenSpaceGuid.Pcd8259LegacyModeEdgeLevel|0x0E20

+  # We have no useful workload for APs, so let's not start them up, because

+  # they would spin indefinitely until ExitBootServices().

+  gUefiCpuPkgTokenSpaceGuid.PcdCpuMaxLogicalProcessorNumber|1

+

 ################################################################################

 #

 # Pcd Dynamic Section - list of all EDK II PCD Entries defined by this Platform

diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc

index 4de961f..370ae50 100644

--- a/OvmfPkg/OvmfPkgIa32X64.dsc

+++ b/OvmfPkg/OvmfPkgIa32X64.dsc

@@ -335,6 +335,10 @@

   # IRQs 5, 9, 10, 11 are level-triggered

   gPcAtChipsetPkgTokenSpaceGuid.Pcd8259LegacyModeEdgeLevel|0x0E20

+  # We have no useful workload for APs, so let's not start them up, because

+  # they would spin indefinitely until ExitBootServices().

+  gUefiCpuPkgTokenSpaceGuid.PcdCpuMaxLogicalProcessorNumber|1

+

 ################################################################################

 #

 # Pcd Dynamic Section - list of all EDK II PCD Entries defined by this Platform

diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc

index 6c38081..175d5f4 100644

--- a/OvmfPkg/OvmfPkgX64.dsc

+++ b/OvmfPkg/OvmfPkgX64.dsc

@@ -334,6 +334,10 @@

   # IRQs 5, 9, 10, 11 are level-triggered

   gPcAtChipsetPkgTokenSpaceGuid.Pcd8259LegacyModeEdgeLevel|0x0E20

+  # We have no useful workload for APs, so let's not start them up, because

+  # they would spin indefinitely until ExitBootServices().

+  gUefiCpuPkgTokenSpaceGuid.PcdCpuMaxLogicalProcessorNumber|1

+

 ################################################################################

 #

 # Pcd Dynamic Section - list of all EDK II PCD Entries defined by this Platform

-- 

1.8.3.1