50 lines
2.0 KiB
Diff
50 lines
2.0 KiB
Diff
From 41089770963055b4bc9662ba4204d8ee7907fbcd Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Tue, 28 Feb 2023 15:47:00 +0100
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Subject: [PATCH] UefiCpuPkg/MpInitLib: fix apic mode for cpu hotplug
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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RH-MergeRequest: 42: UefiCpuPkg/MpInitLib: fix apic mode for cpu hotplug
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RH-Bugzilla: 2124143
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Commit: [1/1] 5168501c31541a57aaeb3b3bd7c3602205eb7cdf (kraxel/centos-edk2)
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In case the number of CPUs can in increase beyond 255
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due to CPU hotplug choose x2apic mode.
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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patch_name: edk2-UefiCpuPkg-MpInitLib-fix-apic-mode-for-cpu-hotplug.patch
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present_in_specfile: true
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location_in_specfile: 38
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---
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UefiCpuPkg/Library/MpInitLib/MpLib.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c b/UefiCpuPkg/Library/MpInitLib/MpLib.c
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index 9a6ec5db5c..14ecc62f2b 100644
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--- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
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+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
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@@ -527,7 +527,9 @@ CollectProcessorCount (
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//
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// Enable x2APIC mode if
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// 1. Number of CPU is greater than 255; or
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- // 2. There are any logical processors reporting an Initial APIC ID of 255 or greater.
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+ // 2. The platform exposed the exact *boot* CPU count to us in advance, and
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+ // more than 255 logical processors are possible later, with hotplug; or
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+ // 3. There are any logical processors reporting an Initial APIC ID of 255 or greater.
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//
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X2Apic = FALSE;
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if (CpuMpData->CpuCount > 255) {
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@@ -535,6 +537,10 @@ CollectProcessorCount (
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// If there are more than 255 processor found, force to enable X2APIC
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//
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X2Apic = TRUE;
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+ } else if ((PcdGet32 (PcdCpuBootLogicalProcessorNumber) > 0) &&
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+ (PcdGet32 (PcdCpuMaxLogicalProcessorNumber) > 255))
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+ {
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+ X2Apic = TRUE;
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} else {
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CpuInfoInHob = (CPU_INFO_IN_HOB *)(UINTN)CpuMpData->CpuInfoInHob;
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for (Index = 0; Index < CpuMpData->CpuCount; Index++) {
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