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apic_common: vapic_paddr synchronization fix

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This patch postpones vapic_paddr initialization, which is performed
during migration. When vapic_paddr is synchronized within the migration
process, apic_common functions could operate with incorrect apic state,
if it hadn't loaded yet. This patch postpones the synchronization until
the virtual machine is started, ensuring that the whole virtual machine
state has been loaded.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Tested-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2014-08-28 15:19:03 +04:00 committed by Paolo Bonzini
parent 9b10ac869d
commit a6dead43e6
1 changed files with 26 additions and 11 deletions
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37
hw/i386/kvmvapic.c
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@ -59,6 +59,7 @@ typedef struct VAPICROMState {
GuestROMState rom_state;
size_t rom_size;
bool rom_mapped_writable;
VMChangeStateEntry *vmsentry;
} VAPICROMState;
#define TYPE_VAPIC "kvmvapic"
@ -734,11 +735,34 @@ static void do_vapic_enable(void *data)
vapic_enable(s, cpu);
}
static int vapic_post_load(void *opaque, int version_id)
static void kvmvapic_vm_state_change(void *opaque, int running,
RunState state)
{
VAPICROMState *s = opaque;
uint8_t *zero;
if (!running) {
return;
}
if (s->state == VAPIC_ACTIVE) {
if (smp_cpus == 1) {
run_on_cpu(first_cpu, do_vapic_enable, s);
} else {
zero = g_malloc0(s->rom_state.vapic_size);
cpu_physical_memory_write(s->vapic_paddr, zero,
s->rom_state.vapic_size);
g_free(zero);
}
}
qemu_del_vm_change_state_handler(s->vmsentry);
}
static int vapic_post_load(void *opaque, int version_id)
{
VAPICROMState *s = opaque;
/*
* The old implementation of qemu-kvm did not provide the state
* VAPIC_STANDBY. Reconstruct it.
@ -752,17 +776,8 @@ static int vapic_post_load(void *opaque, int version_id)
return -1;
}
}
if (s->state == VAPIC_ACTIVE) {
if (smp_cpus == 1) {
run_on_cpu(first_cpu, do_vapic_enable, s);
} else {
zero = g_malloc0(s->rom_state.vapic_size);
cpu_physical_memory_write(s->vapic_paddr, zero,
s->rom_state.vapic_size);
g_free(zero);
}
}
s->vmsentry = qemu_add_vm_change_state_handler(kvmvapic_vm_state_change, s);
return 0;
}