[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen: introduce HVM_PARAM_BUFIOREQ_EVTCHN
On 15/11/2011 13:53, "Stefano Stabellini" <Stefano.Stabellini@xxxxxxxxxxxxx> wrote: > From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> > > 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). It doesn't look like this evtchn can be allocated and specified from outside the hypervisor. Hence HVMOP_set_param(BUFIOREQ_EVTCHN) should fail with -EINVAL or similar. -- Keir > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> > --- > xen/arch/x86/hvm/hvm.c | 10 ++++++++++ > xen/arch/x86/hvm/io.c | 2 ++ > xen/include/public/hvm/params.h | 3 ++- > 3 files changed, 14 insertions(+), 1 deletions(-) > > diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c > index ab7763b..dc01537 100644 > --- a/xen/arch/x86/hvm/hvm.c > +++ b/xen/arch/x86/hvm/hvm.c > @@ -972,6 +972,16 @@ 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; > diff --git a/xen/arch/x86/hvm/io.c b/xen/arch/x86/hvm/io.c > index 7ebefc7..41a2ede 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 1c5a1a9..6699788 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__ */ _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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