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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2011-11-16 15:17:37 +0000 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2011-11-16 15:17:37 +0000 |
| commit | 6e78f81a2761d175f82551b1cbcdad6d53392bec (patch) | |
| tree | e8fe2aa550d862b27c1b8fdca94dd64a90e899c1 | |
| parent | 54b1268c59646a05079606ddd3782bbeaf0850bb (diff) | |
| download | xen-6e78f81a2761d175f82551b1cbcdad6d53392bec.tar.gz xen-6e78f81a2761d175f82551b1cbcdad6d53392bec.tar.bz2 xen-6e78f81a2761d175f82551b1cbcdad6d53392bec.zip | |
hvm: introduce HVM_PARAM_BUFIOREQ_EVTCHN
Introduce an event channel for buffered io event notifications,
advertise the port number using an hvm param. This way the device
model is not forced to check the buffered io page for data several
times a second for the entire life of the VM (buffered io is mostly
used for stdvga emulation in Xen that is switched off after the guest
goes into graphical mode).
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Committed-by: Keir Fraser <keir@xen.org>
| -rw-r--r-- | xen/arch/x86/hvm/hvm.c | 13 | ||||
| -rw-r--r-- | xen/arch/x86/hvm/io.c | 2 | ||||
| -rw-r--r-- | xen/include/public/hvm/params.h | 3 |
3 files changed, 17 insertions, 1 deletions
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c index b118195c94..29452a2daf 100644 --- a/xen/arch/x86/hvm/hvm.c +++ b/xen/arch/x86/hvm/hvm.c @@ -985,6 +985,16 @@ int hvm_vcpu_initialise(struct vcpu *v) /* Register ioreq event channel. */ v->arch.hvm_vcpu.xen_port = rc; + + if ( v->vcpu_id == 0 ) + { + /* Create bufioreq event channel. */ + rc = alloc_unbound_xen_event_channel(v, 0); + if ( rc < 0 ) + goto fail2; + v->domain->arch.hvm_domain.params[HVM_PARAM_BUFIOREQ_EVTCHN] = rc; + } + spin_lock(&v->domain->arch.hvm_domain.ioreq.lock); if ( v->domain->arch.hvm_domain.ioreq.va != NULL ) get_ioreq(v)->vp_eport = v->arch.hvm_vcpu.xen_port; @@ -3597,6 +3607,9 @@ long do_hvm_op(unsigned long op, XEN_GUEST_HANDLE(void) arg) if ( rc == 0 ) rc = nestedhvm_vcpu_initialise(v); break; + case HVM_PARAM_BUFIOREQ_EVTCHN: + rc = -EINVAL; + break; } if ( rc == 0 ) diff --git a/xen/arch/x86/hvm/io.c b/xen/arch/x86/hvm/io.c index 7ebefc7460..41a2edea50 100644 --- a/xen/arch/x86/hvm/io.c +++ b/xen/arch/x86/hvm/io.c @@ -118,6 +118,8 @@ int hvm_buffered_io_send(ioreq_t *p) wmb(); pg->write_pointer += qw ? 2 : 1; + notify_via_xen_event_channel(v->domain, + v->domain->arch.hvm_domain.params[HVM_PARAM_BUFIOREQ_EVTCHN]); spin_unlock(&iorp->lock); return 1; diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h index 1c5a1a9964..6699788eae 100644 --- a/xen/include/public/hvm/params.h +++ b/xen/include/public/hvm/params.h @@ -52,6 +52,7 @@ #define HVM_PARAM_IOREQ_PFN 5 #define HVM_PARAM_BUFIOREQ_PFN 6 +#define HVM_PARAM_BUFIOREQ_EVTCHN 26 #ifdef __ia64__ @@ -141,6 +142,6 @@ /* Boolean: Enable nestedhvm (hvm only) */ #define HVM_PARAM_NESTEDHVM 24 -#define HVM_NR_PARAMS 26 +#define HVM_NR_PARAMS 27 #endif /* __XEN_PUBLIC_HVM_PARAMS_H__ */ |