[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 5 of 5] Allow memevent responses to be signaled via the event channel
xen/arch/x86/mm/mem_event.c | 26 ++++++++++++++++++++------ 1 files changed, 20 insertions(+), 6 deletions(-) Don't require a separate domctl to notify the memevent interface that an event has occured. This domctl can be taxing, particularly when you are scaling events and paging to many domains across a single system. Instead, we use the existing event channel to signal when we place something in the ring (as per normal ring operation). Signed-off-by: Adin Scannell <adin@xxxxxxxxxxx> Signed-off-by: Keir Fraser <keir@xxxxxxx> Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx> diff -r c2b5e65331ee -r 29701f5bdd84 xen/arch/x86/mm/mem_event.c --- a/xen/arch/x86/mm/mem_event.c +++ b/xen/arch/x86/mm/mem_event.c @@ -37,9 +37,11 @@ #define mem_event_ring_lock(_med) spin_lock(&(_med)->ring_lock) #define mem_event_ring_unlock(_med) spin_unlock(&(_med)->ring_lock) -static int mem_event_enable(struct domain *d, - xen_domctl_mem_event_op_t *mec, - struct mem_event_domain *med) +static int mem_event_enable( + struct domain *d, + xen_domctl_mem_event_op_t *mec, + struct mem_event_domain *med, + xen_event_channel_notification_t notification_fn) { int rc; struct domain *dom_mem_event = current->domain; @@ -97,7 +99,7 @@ static int mem_event_enable(struct domai /* Allocate event channel */ rc = alloc_unbound_xen_event_channel(d->vcpu[0], current->domain->domain_id, - NULL); + notification_fn); if ( rc < 0 ) goto err; @@ -330,6 +332,18 @@ int mem_event_check_ring(struct domain * return 0; } +/* Registered with Xen-bound event channel for incoming notifications. */ +static void mem_paging_notification(struct vcpu *v, unsigned int port) +{ + p2m_mem_paging_resume(v->domain); +} + +/* Registered with Xen-bound event channel for incoming notifications. */ +static void mem_access_notification(struct vcpu *v, unsigned int port) +{ + p2m_mem_access_resume(v->domain); +} + int mem_event_domctl(struct domain *d, xen_domctl_mem_event_op_t *mec, XEN_GUEST_HANDLE(void) u_domctl) { @@ -391,7 +405,7 @@ int mem_event_domctl(struct domain *d, x if ( p2m->pod.entry_count ) break; - rc = mem_event_enable(d, mec, med); + rc = mem_event_enable(d, mec, med, mem_paging_notification); } break; @@ -430,7 +444,7 @@ int mem_event_domctl(struct domain *d, x if ( boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ) break; - rc = mem_event_enable(d, mec, med); + rc = mem_event_enable(d, mec, med, mem_access_notification); } break; _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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