On Wed, Jun 03, 2009 at 03:16:46PM +0300, Avi Kivity wrote:
> Gleb Natapov wrote:
>> kvm_*_mpstate() cannot be called from kvm_arch_*_registers()
>> since kvm_arch_*_registers() sometimes called from io thread, but
>> kvm_*_mpstate() can be called only by cpu thread.
>>
>>
>
> I really dislike vcpu functions to be called from outside the vcpu
> thread. Who are the callers?
>
monitor.c. May be others (git grep cpu_synchronize_state). But
kvm_save_registers() does the right thing and calls another function on
vcpu thread.
>> Signed-off-by: Gleb Natapov <g...@redhat.com>
>> diff --git a/qemu-kvm.c b/qemu-kvm.c
>> index 68d3b92..7ed1e06 100644
>> --- a/qemu-kvm.c
>> +++ b/qemu-kvm.c
>> @@ -1431,26 +1431,3 @@ void qemu_kvm_cpu_stop(CPUState *env)
>> if (kvm_enabled())
>> env->kvm_cpu_state.stopped = 1;
>> }
>> -
>> -void kvm_arch_get_registers(CPUState *env)
>> -{
>> - kvm_save_registers(env);
>> - kvm_save_mpstate(env);
>> -}
>> -
>> -void kvm_arch_put_registers(CPUState *env)
>> -{
>> - kvm_load_registers(env);
>> - kvm_load_mpstate(env);
>> -}
>> -
>> -
>> -void cpu_synchronize_state(CPUState *env, int modified)
>> -{
>> - if (kvm_enabled()) {
>> - if (modified)
>> - kvm_arch_put_registers(env);
>> - else
>> - kvm_arch_get_registers(env);
>> - }
>> -}
>> diff --git a/qemu-kvm.h b/qemu-kvm.h
>> index 725589b..5d47e88 100644
>> --- a/qemu-kvm.h
>> +++ b/qemu-kvm.h
>> @@ -216,10 +216,25 @@ int kvm_log_stop(target_phys_addr_t phys_addr,
>> target_phys_addr_t len);
>> static inline int kvm_sync_vcpus(void) { return 0; }
>> -void kvm_arch_get_registers(CPUState *env);
>> -void kvm_arch_put_registers(CPUState *env);
>> +static inline void kvm_arch_get_registers(CPUState *env)
>> +{
>> + kvm_save_registers(env);
>> +}
>> -void cpu_synchronize_state(CPUState *env, int modified);
>> +static inline void kvm_arch_put_registers(CPUState *env)
>> +{
>> + kvm_load_registers(env);
>> +}
>> +
>> +static inline void cpu_synchronize_state(CPUState *env, int modified)
>> +{
>> + if (kvm_enabled()) {
>> + if (modified)
>> + kvm_arch_put_registers(env);
>> + else
>> + kvm_arch_get_registers(env);
>> + }
>> +}
>> uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t
>> function,
>> int reg);
>> diff --git a/target-i386/machine.c b/target-i386/machine.c
>> index f280d3d..07df1e1 100644
>> --- a/target-i386/machine.c
>> +++ b/target-i386/machine.c
>> @@ -32,7 +32,10 @@ void cpu_save(QEMUFile *f, void *opaque)
>> int32_t pending_irq;
>> int i, bit;
>> - cpu_synchronize_state(env, 0);
>> + if (kvm_enabled()) {
>> + kvm_save_registers(env);
>> + kvm_save_mpstate(env);
>> + }
>> for(i = 0; i < CPU_NB_REGS; i++)
>> qemu_put_betls(f, &env->regs[i]);
>> --
>> Gleb.
>>
>
>
> --
> Do not meddle in the internals of kernels, for they are subtle and quick to
> panic.
--
Gleb.
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