Liam Merwick <[email protected]> writes: > Attempting to migrate a VM using the microvm machine class results in the > source > QEMU aborting with the following message/backtrace: > > target/i386/machine.c:955:tsc_khz_needed: Object 0x555556608fa0 is not an > instance of type generic-pc-machine > > abort() > object_class_dynamic_cast_assert() > vmstate_save_state_v() > vmstate_save_state() > vmstate_save() > qemu_savevm_state_complete_precopy() > migration_thread() > migration_thread() > migration_thread() > qemu_thread_start() > start_thread() > clone() > > The access to the machine class returned by MACHINE_GET_CLASS() in > tsc_khz_needed() is crashing as it is trying to dereference a different > type of machine class object (TYPE_PC_MACHINE) to that of this microVM. > > This can be resolved by extending the changes in the following commit > f0bb276bf8d5 ("hw/i386: split PCMachineState deriving X86MachineState from > it") > and moving the save_tsc_khz field in PCMachineClass to X86MachineClass. > > Fixes: f0bb276bf8d5 ("hw/i386: split PCMachineState deriving X86MachineState > from it") > Signed-off-by: Liam Merwick <[email protected]> > Reviewed-by: Darren Kenny <[email protected]> > --- > > v1 -> v2 - fix SHA1 of patch being referenced. > > hw/i386/pc.c | 1 - > hw/i386/pc_piix.c | 4 ++-- > hw/i386/pc_q35.c | 4 ++-- > hw/i386/x86.c | 1 + > include/hw/i386/pc.h | 2 -- > include/hw/i386/x86.h | 2 ++ > target/i386/machine.c | 4 ++-- > 7 files changed, 9 insertions(+), 9 deletions(-) > > diff --git a/hw/i386/pc.c b/hw/i386/pc.c > index 96715f8a3f99..ac08e6360437 100644 > --- a/hw/i386/pc.c > +++ b/hw/i386/pc.c > @@ -2195,7 +2195,6 @@ static void pc_machine_class_init(ObjectClass *oc, void > *data) > /* BIOS ACPI tables: 128K. Other BIOS datastructures: less than 4K > reported > * to be used at the moment, 32K should be enough for a while. */ > pcmc->acpi_data_size = 0x20000 + 0x8000; > - pcmc->save_tsc_khz = true; > pcmc->linuxboot_dma_enabled = true; > pcmc->pvh_enabled = true; > assert(!mc->get_hotplug_handler); > diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c > index 2aefa3b8dfe3..0548c259dc74 100644 > --- a/hw/i386/pc_piix.c > +++ b/hw/i386/pc_piix.c > @@ -567,10 +567,10 @@ DEFINE_I440FX_MACHINE(v2_6, "pc-i440fx-2.6", NULL, > > static void pc_i440fx_2_5_machine_options(MachineClass *m) > { > - PCMachineClass *pcmc = PC_MACHINE_CLASS(m); > + X86MachineClass *x86mc = X86_MACHINE_CLASS(m); > > pc_i440fx_2_6_machine_options(m); > - pcmc->save_tsc_khz = false; > + x86mc->save_tsc_khz = false; > m->legacy_fw_cfg_order = 1; > compat_props_add(m->compat_props, hw_compat_2_5, hw_compat_2_5_len); > compat_props_add(m->compat_props, pc_compat_2_5, pc_compat_2_5_len); > diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c > index d51f5247276d..385e5cffb167 100644 > --- a/hw/i386/pc_q35.c > +++ b/hw/i386/pc_q35.c > @@ -508,10 +508,10 @@ DEFINE_Q35_MACHINE(v2_6, "pc-q35-2.6", NULL, > > static void pc_q35_2_5_machine_options(MachineClass *m) > { > - PCMachineClass *pcmc = PC_MACHINE_CLASS(m); > + X86MachineClass *x86mc = X86_MACHINE_CLASS(m); > > pc_q35_2_6_machine_options(m); > - pcmc->save_tsc_khz = false; > + x86mc->save_tsc_khz = false; > m->legacy_fw_cfg_order = 1; > compat_props_add(m->compat_props, hw_compat_2_5, hw_compat_2_5_len); > compat_props_add(m->compat_props, pc_compat_2_5, pc_compat_2_5_len); > diff --git a/hw/i386/x86.c b/hw/i386/x86.c > index fd84b23124e6..394edc2f7209 100644 > --- a/hw/i386/x86.c > +++ b/hw/i386/x86.c > @@ -763,6 +763,7 @@ static void x86_machine_class_init(ObjectClass *oc, void > *data) > mc->get_default_cpu_node_id = x86_get_default_cpu_node_id; > mc->possible_cpu_arch_ids = x86_possible_cpu_arch_ids; > x86mc->compat_apic_id_mode = false; > + x86mc->save_tsc_khz = true; > nc->nmi_monitor_handler = x86_nmi; > > object_class_property_add(oc, X86_MACHINE_MAX_RAM_BELOW_4G, "size", > diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h > index e6fa8418ca61..1f86eba3f998 100644 > --- a/include/hw/i386/pc.h > +++ b/include/hw/i386/pc.h > @@ -116,8 +116,6 @@ typedef struct PCMachineClass { > bool enforce_aligned_dimm; > bool broken_reserved_end; > > - /* TSC rate migration: */ > - bool save_tsc_khz; > /* generate legacy CPU hotplug AML */ > bool legacy_cpu_hotplug; > > diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h > index 82d09fd7d099..4b8491788526 100644 > --- a/include/hw/i386/x86.h > +++ b/include/hw/i386/x86.h > @@ -30,6 +30,8 @@ typedef struct { > > /*< public >*/ > > + /* TSC rate migration: */ > + bool save_tsc_khz; > /* Enables contiguous-apic-ID mode */ > bool compat_apic_id_mode; > } X86MachineClass; > diff --git a/target/i386/machine.c b/target/i386/machine.c > index 6481f846f6e9..7bdeb7815755 100644 > --- a/target/i386/machine.c > +++ b/target/i386/machine.c > @@ -988,8 +988,8 @@ static bool tsc_khz_needed(void *opaque) > X86CPU *cpu = opaque; > CPUX86State *env = &cpu->env; > MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine()); > - PCMachineClass *pcmc = PC_MACHINE_CLASS(mc); > - return env->tsc_khz && pcmc->save_tsc_khz; > + X86MachineClass *x86mc = X86_MACHINE_CLASS(mc); > + return env->tsc_khz && x86mc->save_tsc_khz; > } > > static const VMStateDescription vmstate_tsc_khz = {
LGTM, thanks. Reviewed-by: Sergio Lopez <[email protected]>
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