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hw/i386/acpi: Set PCAT_COMPAT bit only when pic is not disabled 

A value 1 of PCAT_COMPAT (bit 0) of MADT.Flags indicates that the system
also has a PC-AT-compatible dual-8259 setup, i.e., the PIC.  When PIC
is not enabled (pic=off) for x86 machine, the PCAT_COMPAT bit needs to
be cleared.  The PIC probe should then print:

   [    0.155970] Using NULL legacy PIC

However, no such log printed in guest kernel unless PCAT_COMPAT is
cleared.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-ID: <20240403145953.3082491-1-xiaoyao.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2024-04-03 10:59:53 -04:00 committed by Paolo Bonzini
parent b07bf7b73f
commit 292dd287e7
1 changed files with 3 additions and 1 deletions
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4
hw/i386/acpi-common.c
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@ -107,7 +107,9 @@ void acpi_build_madt(GArray *table_data, BIOSLinker *linker,
acpi_table_begin(&table, table_data);
/* Local APIC Address */
build_append_int_noprefix(table_data, APIC_DEFAULT_ADDRESS, 4);
build_append_int_noprefix(table_data, 1 /* PCAT_COMPAT */, 4); /* Flags */
/* Flags. bit 0: PCAT_COMPAT */
build_append_int_noprefix(table_data,
x86ms->pic != ON_OFF_AUTO_OFF ? 1 : 0 , 4);
for (i = 0; i < apic_ids->len; i++) {
pc_madt_cpu_entry(i, apic_ids, table_data, false);