43 lines
1.7 KiB
Diff
43 lines
1.7 KiB
Diff
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From e2fb1116801f5725812b37f18022fe46959bd5fb 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 27/27] UefiCpuPkg/MpInitLib: fix apic mode for cpu hotplug
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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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---
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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 f1f284071441..79fd8fb04dad 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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@@ -526,7 +526,9 @@ 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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@@ -534,6 +536,10 @@ 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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--
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2.40.1
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