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pc: fix FW_CFG_NB_CPUS to account for -device added CPUs 

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1479301481-197333-1-git-send-email-imammedo@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Igor Mammedov 2016-11-16 14:04:41 +01:00 committed by Eduardo Habkost
parent 5836d16812
commit e3cadac073
2 changed files with 29 additions and 17 deletions
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44
hw/i386/pc.c
View File

@ -744,7 +744,7 @@ static FWCfgState *bochs_bios_init(AddressSpace *as, PCMachineState *pcms)
int i, j;
fw_cfg = fw_cfg_init_io_dma(FW_CFG_IO_BASE, FW_CFG_IO_BASE + 4, as);
fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, pcms->boot_cpus);
/* FW_CFG_MAX_CPUS is a bit confusing/problematic on x86:
*
@ -1087,17 +1087,6 @@ void pc_acpi_smi_interrupt(void *opaque, int irq, int level)
}
}
static int pc_present_cpus_count(PCMachineState *pcms)
{
int i, boot_cpus = 0;
for (i = 0; i < pcms->possible_cpus->len; i++) {
if (pcms->possible_cpus->cpus[i].cpu) {
boot_cpus++;
}
}
return boot_cpus;
}
static X86CPU *pc_new_cpu(const char *typename, int64_t apic_id,
Error **errp)
{
@ -1234,6 +1223,19 @@ static void pc_build_feature_control_file(PCMachineState *pcms)
fw_cfg_add_file(pcms->fw_cfg, "etc/msr_feature_control", val, sizeof(*val));
}
static void rtc_set_cpus_count(ISADevice *rtc, uint16_t cpus_count)
{
if (cpus_count > 0xff) {
/* If the number of CPUs can't be represented in 8 bits, the
* BIOS must use "FW_CFG_NB_CPUS". Set RTC field to 0 just
* to make old BIOSes fail more predictably.
*/
rtc_set_memory(rtc, 0x5f, 0);
} else {
rtc_set_memory(rtc, 0x5f, cpus_count - 1);
}
}
static
void pc_machine_done(Notifier *notifier, void *data)
{
@ -1242,7 +1244,7 @@ void pc_machine_done(Notifier *notifier, void *data)
PCIBus *bus = pcms->bus;
/* set the number of CPUs */
rtc_set_memory(pcms->rtc, 0x5f, pc_present_cpus_count(pcms) - 1);
rtc_set_cpus_count(pcms->rtc, pcms->boot_cpus);
if (bus) {
int extra_hosts = 0;
@ -1265,6 +1267,8 @@ void pc_machine_done(Notifier *notifier, void *data)
if (pcms->fw_cfg) {
pc_build_smbios(pcms->fw_cfg);
pc_build_feature_control_file(pcms);
/* update FW_CFG_NB_CPUS to account for -device added CPUs */
fw_cfg_modify_i16(pcms->fw_cfg, FW_CFG_NB_CPUS, pcms->boot_cpus);
}
if (pcms->apic_id_limit > 255) {
@ -1342,7 +1346,7 @@ void xen_load_linux(PCMachineState *pcms)
assert(MACHINE(pcms)->kernel_filename != NULL);
fw_cfg = fw_cfg_init_io(FW_CFG_IO_BASE);
fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, pcms->boot_cpus);
rom_set_fw(fw_cfg);
load_linux(pcms, fw_cfg);
@ -1812,9 +1816,11 @@ static void pc_cpu_plug(HotplugHandler *hotplug_dev,
}
}
/* increment the number of CPUs */
pcms->boot_cpus++;
if (dev->hotplugged) {
/* increment the number of CPUs */
rtc_set_memory(pcms->rtc, 0x5f, rtc_get_memory(pcms->rtc, 0x5f) + 1);
rtc_set_cpus_count(pcms->rtc, pcms->boot_cpus);
fw_cfg_modify_i16(pcms->fw_cfg, FW_CFG_NB_CPUS, pcms->boot_cpus);
}
found_cpu = pc_find_cpu_slot(pcms, CPU(dev), NULL);
@ -1868,7 +1874,11 @@ static void pc_cpu_unplug_cb(HotplugHandler *hotplug_dev,
found_cpu->cpu = NULL;
object_unparent(OBJECT(dev));
rtc_set_memory(pcms->rtc, 0x5f, rtc_get_memory(pcms->rtc, 0x5f) - 1);
/* decrement the number of CPUs */
pcms->boot_cpus--;
/* Update the number of CPUs in CMOS */
rtc_set_cpus_count(pcms->rtc, pcms->boot_cpus);
fw_cfg_modify_i16(pcms->fw_cfg, FW_CFG_NB_CPUS, pcms->boot_cpus);
out:
error_propagate(errp, local_err);
}

2
include/hw/i386/pc.h
View File

@ -36,6 +36,7 @@
/**
* PCMachineState:
* @acpi_dev: link to ACPI PM device that performs ACPI hotplug handling
* @boot_cpus: number of present VCPUs
*/
struct PCMachineState {
/*< private >*/
@ -70,6 +71,7 @@ struct PCMachineState {
bool apic_xrupt_override;
unsigned apic_id_limit;
CPUArchIdList *possible_cpus;
uint16_t boot_cpus;
/* NUMA information: */
uint64_t numa_nodes;