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[Qemu-devel] [PATCH v4 07/13] pc: apic_common: reset APIC ID to initial
From: |
Igor Mammedov |
Subject: |
[Qemu-devel] [PATCH v4 07/13] pc: apic_common: reset APIC ID to initial ID when switching into x2APIC mode |
Date: |
Wed, 19 Oct 2016 14:05:37 +0200 |
SDM: x2APIC State Transitions:
State Changes From xAPIC Mode to x2APIC Mode
"
Any APIC ID value written to the memory-mapped
local APIC ID register is not preserved
"
Signed-off-by: Igor Mammedov <address@hidden>
Reviewed-by: Radim Krčmář <address@hidden>
---
hw/intc/apic_common.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index ea3c8ca..d78c885 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -40,6 +40,11 @@ void cpu_set_apic_base(DeviceState *dev, uint64_t val)
if (dev) {
APICCommonState *s = APIC_COMMON(dev);
APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
+ /* switching to x2APIC, reset possibly modified xAPIC ID */
+ if (!(s->apicbase & MSR_IA32_APICBASE_EXTD) &&
+ (val & MSR_IA32_APICBASE_EXTD)) {
+ s->id = s->initial_apic_id;
+ }
info->set_base(s, val);
}
}
--
2.7.4
- [Qemu-devel] [PATCH v4 03/13] acpi: cphp: force switch to modern cpu hotplug if APIC ID > 254, (continued)
- [Qemu-devel] [PATCH v4 03/13] acpi: cphp: force switch to modern cpu hotplug if APIC ID > 254, Igor Mammedov, 2016/10/19
- [Qemu-devel] [PATCH v4 01/13] pc: acpi: x2APIC support for MADT table and _MAT method, Igor Mammedov, 2016/10/19
- [Qemu-devel] [PATCH v4 06/13] pc: apic_common: restore APIC ID to initial ID on reset, Igor Mammedov, 2016/10/19
- [Qemu-devel] [PATCH v4 05/13] pc: apic_common: extend APIC ID property to 32bit, Igor Mammedov, 2016/10/19
- [Qemu-devel] [PATCH v4 04/13] pc: leave max apic_id_limit only in legacy cpu hotplug code, Igor Mammedov, 2016/10/19
- [Qemu-devel] [PATCH v4 08/13] pc: kvm_apic: pass APIC ID depending on xAPIC/x2APIC mode, Igor Mammedov, 2016/10/19
- [Qemu-devel] [PATCH v4 07/13] pc: apic_common: reset APIC ID to initial ID when switching into x2APIC mode,
Igor Mammedov <=
- [Qemu-devel] [PATCH v4 09/13] pc: clarify FW_CFG_MAX_CPUS usage comment, Igor Mammedov, 2016/10/19
- [Qemu-devel] [PATCH v4 10/13] increase MAX_CPUMASK_BITS from 255 to 288, Igor Mammedov, 2016/10/19
- [Qemu-devel] [PATCH v4 12/13] pc: require IRQ remapping and EIM if there could be x2APIC CPUs, Igor Mammedov, 2016/10/19
- [Qemu-devel] [PATCH v4 13/13] pc: q35: bump max_cpus to 288, Igor Mammedov, 2016/10/19
- [Qemu-devel] [PATCH v4 11/13] pc: add 'etc/boot-cpus' fw_cfg file for machine with more than 255 CPUs, Igor Mammedov, 2016/10/19