Messages in this thread | | | Date | Mon, 20 Aug 2007 17:08:23 +0300 | From | Avi Kivity <> | Subject | Re: [kvm-devel] [PATCH 4/4] Modify KVM to update guest time accounting. |
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Laurent Vivier wrote: > Avi Kivity wrote: > >> Laurent Vivier wrote: >> >>> [PATCH 4/4] Modify KVM to update guest time accounting. >>> >>> >>> >>> Index: kvm/drivers/kvm/kvm.h >>> =================================================================== >>> --- kvm.orig/drivers/kvm/kvm.h 2007-08-20 13:23:53.000000000 +0200 >>> +++ kvm/drivers/kvm/kvm.h 2007-08-20 13:23:58.000000000 +0200 >>> @@ -589,6 +589,17 @@ void kvm_mmu_unload(struct kvm_vcpu *vcp >>> >>> int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run); >>> >>> +static inline void kvm_guest_enter(void) >>> +{ >>> +#ifdef CONFIG_GUEST_ACCOUNTING >>> + current->flags |= PF_VCPU; >>> +#endif >>> >>> >> Since you select GUEST_ACCOUNTING, the #ifdef is always true? >> > > It is just to avoid error if we compile kvm module outside of the kernel, with > kernel without support of guest accounting. Can be removed if you want. > >
Ah okay. We take care of the external module in external-module-compat.h (in this case, we can #define PF_VCPU to 0 if it is undefined).
>>> +} >>> + >>> +static inline void kvm_guest_exit(void) >>> +{ >>> >>> >> Missing content? >> > > No, empty function. > > It is just to introduce "symmetry" in code, the VCPU code begins with > "kvm_guest_start()" and ends with "kvm_guest_exit()". And we have no operation > to do in kvm_guest_exit() (the PF_VCPU is cleared by account_system_time()), so > "empty function", removed by the optimizer (I hope). >
But what if account_system_time() is not called (because we exited before the timer interrupt hit)?
-- error compiling committee.c: too many arguments to function
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