| Message ID | 20121016035933.GM1218@drongo (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 10/16/2012 05:59 AM, Paul Mackerras wrote: > The mmu_notifier_retry() function, used to test whether any page > invalidations are in progress, currently takes a vcpu pointer, though > the code only needs the VM's struct kvm pointer. Forthcoming patches > to the powerpc Book3S HV code will need to test for retry within a VM > ioctl, where a struct kvm pointer is available but a struct vcpu > pointer isn't. Therefore this creates a variant of mmu_notifier_retry > called kvm_mmu_notifier_retry that takes a struct kvm pointer, and > implements mmu_notifier_retry in terms of it. Why not change mmu_notifier_retry() and all its callers?
On 16.10.2012, at 11:44, Avi Kivity wrote: > On 10/16/2012 05:59 AM, Paul Mackerras wrote: >> The mmu_notifier_retry() function, used to test whether any page >> invalidations are in progress, currently takes a vcpu pointer, though >> the code only needs the VM's struct kvm pointer. Forthcoming patches >> to the powerpc Book3S HV code will need to test for retry within a VM >> ioctl, where a struct kvm pointer is available but a struct vcpu >> pointer isn't. Therefore this creates a variant of mmu_notifier_retry >> called kvm_mmu_notifier_retry that takes a struct kvm pointer, and >> implements mmu_notifier_retry in terms of it. > > Why not change mmu_notifier_retry() and all its callers? Why not use Christoffer's patch? :) Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 6afc5be..1cc1e1d 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -841,9 +841,9 @@ extern struct kvm_stats_debugfs_item debugfs_entries[]; extern struct dentry *kvm_debugfs_dir; #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) -static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq) +static inline int kvm_mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq) { - if (unlikely(vcpu->kvm->mmu_notifier_count)) + if (unlikely(kvm->mmu_notifier_count)) return 1; /* * Ensure the read of mmu_notifier_count happens before the read @@ -856,10 +856,15 @@ static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_se * can't rely on kvm->mmu_lock to keep things ordered. */ smp_rmb(); - if (vcpu->kvm->mmu_notifier_seq != mmu_seq) + if (kvm->mmu_notifier_seq != mmu_seq) return 1; return 0; } + +static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq) +{ + return kvm_mmu_notifier_retry(vcpu->kvm, mmu_seq); +} #endif #ifdef KVM_CAP_IRQ_ROUTING
The mmu_notifier_retry() function, used to test whether any page invalidations are in progress, currently takes a vcpu pointer, though the code only needs the VM's struct kvm pointer. Forthcoming patches to the powerpc Book3S HV code will need to test for retry within a VM ioctl, where a struct kvm pointer is available but a struct vcpu pointer isn't. Therefore this creates a variant of mmu_notifier_retry called kvm_mmu_notifier_retry that takes a struct kvm pointer, and implements mmu_notifier_retry in terms of it. Signed-off-by: Paul Mackerras <paulus@samba.org> --- include/linux/kvm_host.h | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)