[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] hvm: introduce HVM_PARAM_BUFIOREQ_EVTCHN
# HG changeset patch # User Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> # Date 1321456657 0 # Node ID a5f1d3b1612bb48e1cb09dc66b0909e3613dc855 # Parent fd3567cafe1c7ccd0ddba0ad7fb067d435e13529 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@xxxxxxxxxxxxx> Committed-by: Keir Fraser <keir@xxxxxxx> --- diff -r fd3567cafe1c -r a5f1d3b1612b xen/arch/x86/hvm/hvm.c --- a/xen/arch/x86/hvm/hvm.c Tue Nov 15 14:50:18 2011 +0100 +++ b/xen/arch/x86/hvm/hvm.c Wed Nov 16 15:17:37 2011 +0000 @@ -985,6 +985,16 @@ /* 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 @@ if ( rc == 0 ) rc = nestedhvm_vcpu_initialise(v); break; + case HVM_PARAM_BUFIOREQ_EVTCHN: + rc = -EINVAL; + break; } if ( rc == 0 ) diff -r fd3567cafe1c -r a5f1d3b1612b xen/arch/x86/hvm/io.c --- a/xen/arch/x86/hvm/io.c Tue Nov 15 14:50:18 2011 +0100 +++ b/xen/arch/x86/hvm/io.c Wed Nov 16 15:17:37 2011 +0000 @@ -118,6 +118,8 @@ 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 -r fd3567cafe1c -r a5f1d3b1612b xen/include/public/hvm/params.h --- a/xen/include/public/hvm/params.h Tue Nov 15 14:50:18 2011 +0100 +++ b/xen/include/public/hvm/params.h Wed Nov 16 15:17:37 2011 +0000 @@ -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-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
|
![]() |
Lists.xenproject.org is hosted with RackSpace, monitoring our |