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[Qemu-devel] [PATCH for-1.4 12/12] pc: Generate APIC IDs according to CP
From: |
Eduardo Habkost |
Subject: |
[Qemu-devel] [PATCH for-1.4 12/12] pc: Generate APIC IDs according to CPU topology |
Date: |
Thu, 17 Jan 2013 18:59:38 -0200 |
This keeps compatibility on machine-types pc-1.2 and older, and prints a
warning in case the requested configuration won't get the correct
topology.
I couldn't think of a better way to warn about broken topology when in
compat mode other than using error_report(). The warning message will be
probably be buried in a log file somewhere, but it's better than
nothing.
Signed-off-by: Eduardo Habkost <address@hidden>
---
Changes v1 -> v2:
- Move code to cpu.c
- keep using cpu_index on *-user
- Use SMP.contiguous_apic_ids global property
- Prints warning in case the compatibility mode will expose incorrect
topology
Changes v2 -> v3:
- Now all code is inside hw/pc.c
- Use a real "PC" class and a "contiguous_apic_ids" property
Changes v3 -> v4:
- Instead of using a global property, use a separate machine init
function and a PCInitArgs field, to implement compatibility mode
- Use error_report() instead of fprintf(stderr) for the warning
- Use a field on PCInitArgs instead of a static variable to check
if warning was already printed
Changes v4 -> v5:
- Don't use PCInitArgs: simply add a enable_compat_apic_id_mode()
function and a static compat_apic_id_mode variable, to enable the
compatibility mode
- Move APIC ID calculation code to cpu.c
---
hw/pc_piix.c | 12 ++++++++++--
target-i386/cpu.c | 28 ++++++++++++++++++++++++----
target-i386/cpu.h | 1 +
3 files changed, 35 insertions(+), 6 deletions(-)
diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index f9cfe78..b9a9b2e 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -233,11 +233,17 @@ static void pc_init_pci(QEMUMachineInitArgs *args)
initrd_filename, cpu_model, 1, 1);
}
+static void pc_init_pci_1_3(QEMUMachineInitArgs *args)
+{
+ enable_compat_apic_id_mode();
+ pc_init_pci(args);
+}
+
/* PC machine init function for pc-0.14 to pc-1.2 */
static void pc_init_pci_1_2(QEMUMachineInitArgs *args)
{
disable_kvm_pv_eoi();
- pc_init_pci(args);
+ pc_init_pci_1_3(args);
}
/* PC init function for pc-0.10 to pc-0.13, and reused by xenfv */
@@ -250,6 +256,7 @@ static void pc_init_pci_no_kvmclock(QEMUMachineInitArgs
*args)
const char *initrd_filename = args->initrd_filename;
const char *boot_device = args->boot_device;
disable_kvm_pv_eoi();
+ enable_compat_apic_id_mode();
pc_init1(get_system_memory(),
get_system_io(),
ram_size, boot_device,
@@ -268,6 +275,7 @@ static void pc_init_isa(QEMUMachineInitArgs *args)
if (cpu_model == NULL)
cpu_model = "486";
disable_kvm_pv_eoi();
+ enable_compat_apic_id_mode();
pc_init1(get_system_memory(),
get_system_io(),
ram_size, boot_device,
@@ -306,7 +314,7 @@ static QEMUMachine pc_i440fx_machine_v1_4 = {
static QEMUMachine pc_machine_v1_3 = {
.name = "pc-1.3",
.desc = "Standard PC",
- .init = pc_init_pci,
+ .init = pc_init_pci_1_3,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_1_3,
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index d90789d..4588f08 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -23,6 +23,8 @@
#include "cpu.h"
#include "sysemu/kvm.h"
+#include "sysemu/cpus.h"
+#include "topology.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
@@ -2194,6 +2196,14 @@ void x86_cpu_realize(Object *obj, Error **errp)
cpu_reset(CPU(cpu));
}
+/* Enables contiguous-apic-ID mode, for compatibility */
+static bool compat_apic_id_mode;
+
+void enable_compat_apic_id_mode(void)
+{
+ compat_apic_id_mode = true;
+}
+
/* Calculates initial APIC ID for a specific CPU index
*
* Currently we need to be able to calculate the APIC ID from the CPU index
@@ -2203,10 +2213,20 @@ void x86_cpu_realize(Object *obj, Error **errp)
*/
uint32_t apic_id_for_cpu(unsigned int cpu_index)
{
- /* right now APIC ID == CPU index. this will eventually change to use
- * the CPU topology configuration properly
- */
- return cpu_index;
+ uint32_t correct_id;
+ static bool warned;
+
+ correct_id = topo_apicid_for_cpu(smp_cores, smp_threads, cpu_index);
+ if (compat_apic_id_mode) {
+ if (cpu_index != correct_id && !warned) {
+ error_report("APIC IDs set in compatibility mode, "
+ "CPU topology won't match the configuration");
+ warned = true;
+ }
+ return cpu_index;
+ } else {
+ return correct_id;
+ }
}
static void x86_cpu_initfn(Object *obj)
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index d86c0af..cf42d76 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -1256,5 +1256,6 @@ void disable_kvm_pv_eoi(void);
const char *get_register_name_32(unsigned int reg);
uint32_t apic_id_for_cpu(unsigned int cpu_index);
+void enable_compat_apic_id_mode(void);
#endif /* CPU_I386_H */
--
1.7.11.7
- [Qemu-devel] [PATCH for-1.4 00/12] target-i386: Fix APIC-ID-based topology (v4), Eduardo Habkost, 2013/01/17
- [Qemu-devel] [PATCH for-1.4 10/12] tests: Support target-specific unit tests, Eduardo Habkost, 2013/01/17
- [Qemu-devel] [PATCH for-1.4 02/12] target-i386: Don't set any KVM flag by default if KVM is disabled, Eduardo Habkost, 2013/01/17
- [Qemu-devel] [PATCH for-1.4 06/12] fw_cfg: Remove FW_CFG_MAX_CPUS from fw_cfg_init(), Eduardo Habkost, 2013/01/17
- [Qemu-devel] [PATCH for-1.4 12/12] pc: Generate APIC IDs according to CPU topology,
Eduardo Habkost <=
- [Qemu-devel] [PATCH for-1.4 03/12] pc: Reverse pc_init_pci() compatibility logic, Eduardo Habkost, 2013/01/17
- [Qemu-devel] [PATCH for-1.4 05/12] target-i386: kvm: Set vcpu_id to APIC ID instead of CPU index, Eduardo Habkost, 2013/01/17
- [Qemu-devel] [PATCH for-1.4 01/12] kvm: Add fake KVM_FEATURE_CLOCKSOURCE_STABLE_BIT for builds withou KVM, Eduardo Habkost, 2013/01/17