From a6dead43e6b3b01122f700e9e5736a1255561965 Mon Sep 17 00:00:00 2001 From: Pavel Dovgalyuk Date: Thu, 28 Aug 2014 15:19:03 +0400 Subject: [PATCH] apic_common: vapic_paddr synchronization fix 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 Tested-by: Pavel Dovgalyuk Signed-off-by: Paolo Bonzini --- hw/i386/kvmvapic.c | 37 ++++++++++++++++++++++++++----------- 1 file changed, 26 insertions(+), 11 deletions(-) diff --git a/hw/i386/kvmvapic.c b/hw/i386/kvmvapic.c index ee959632a6..2cca7a44f4 100644 --- a/hw/i386/kvmvapic.c +++ b/hw/i386/kvmvapic.c @@ -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; } -- 2.11.4.GIT