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52 lines
2.0 KiB
52 lines
2.0 KiB
2 months ago
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From 7bb1f124413891bc5d2187f12cd19da6e794904b Mon Sep 17 00:00:00 2001
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From: Xiaoyao Li <xiaoyao.li@intel.com>
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Date: Wed, 3 Apr 2024 10:59:53 -0400
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Subject: [PATCH 010/100] hw/i386/acpi: Set PCAT_COMPAT bit only when pic is
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not disabled
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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RH-MergeRequest: 245: SEV-SNP support
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RH-Jira: RHEL-39544
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Bandan Das <bdas@redhat.com>
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RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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RH-Commit: [10/91] 62110e4bf52cb3e106c8d2a902bbd31548beba00 (bonzini/rhel-qemu-kvm)
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A value 1 of PCAT_COMPAT (bit 0) of MADT.Flags indicates that the system
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also has a PC-AT-compatible dual-8259 setup, i.e., the PIC. When PIC
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is not enabled (pic=off) for x86 machine, the PCAT_COMPAT bit needs to
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be cleared. The PIC probe should then print:
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[ 0.155970] Using NULL legacy PIC
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However, no such log printed in guest kernel unless PCAT_COMPAT is
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cleared.
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Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
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Message-ID: <20240403145953.3082491-1-xiaoyao.li@intel.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 292dd287e78e0cbafde9d1522c729349d132d844)
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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---
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hw/i386/acpi-common.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/hw/i386/acpi-common.c b/hw/i386/acpi-common.c
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index 20f19269da..0cc2919bb8 100644
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--- a/hw/i386/acpi-common.c
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+++ b/hw/i386/acpi-common.c
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@@ -107,7 +107,9 @@ void acpi_build_madt(GArray *table_data, BIOSLinker *linker,
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acpi_table_begin(&table, table_data);
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/* Local APIC Address */
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build_append_int_noprefix(table_data, APIC_DEFAULT_ADDRESS, 4);
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- build_append_int_noprefix(table_data, 1 /* PCAT_COMPAT */, 4); /* Flags */
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+ /* Flags. bit 0: PCAT_COMPAT */
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+ build_append_int_noprefix(table_data,
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+ x86ms->pic != ON_OFF_AUTO_OFF ? 1 : 0 , 4);
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for (i = 0; i < apic_ids->len; i++) {
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pc_madt_cpu_entry(i, apic_ids, table_data, false);
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--
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2.39.3
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