From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: [PATCH 1/3] xen/common: Introduce vcpu_{, un}pause_by_systemcontroller() helpers Date: Thu, 24 Jul 2014 11:56:48 +0100 Message-ID: <1406199410-15823-2-git-send-email-andrew.cooper3@citrix.com> References: <1406199410-15823-1-git-send-email-andrew.cooper3@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1406199410-15823-1-git-send-email-andrew.cooper3@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Xen-devel Cc: Keir Fraser , Ian Campbell , Andrew Cooper , Ian Jackson , Tim Deegan , Jan Beulich List-Id: xen-devel@lists.xenproject.org Which will be used by following patches. Reorder the function declarations for vcpu/domain pause/unpause to group by vcpu/domain and visually separate them slightly. Signed-off-by: Andrew Cooper CC: Keir Fraser CC: Jan Beulich CC: Tim Deegan CC: Ian Campbell CC: Ian Jackson --- xen/common/domain.c | 40 ++++++++++++++++++++++++++++++++++++++++ xen/include/xen/sched.h | 7 ++++++- 2 files changed, 46 insertions(+), 1 deletion(-) diff --git a/xen/common/domain.c b/xen/common/domain.c index cd64aea..d7a84cf 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -878,6 +878,46 @@ void vcpu_unpause(struct vcpu *v) vcpu_wake(v); } +int vcpu_pause_by_systemcontroller(struct vcpu *v) +{ + int old, new, prev = v->controller_pause_count; + + do + { + old = prev; + new = old + 1; + + if ( new > 255 ) + return -EUSERS; + + prev = cmpxchg(&v->controller_pause_count, old, new); + } while ( prev != old ); + + vcpu_pause(v); + + return 0; +} + +int vcpu_unpause_by_systemcontroller(struct vcpu *v) +{ + int old, new, prev = v->controller_pause_count; + + do + { + old = prev; + new = old - 1; + + if ( new < 0 ) + return -EINVAL; + + prev = cmpxchg(&v->controller_pause_count, old, new); + } while ( prev != old ); + + vcpu_unpause(v); + + return 0; +} + void domain_pause(struct domain *d) { struct vcpu *v; diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 62a4785..67eb8f0 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -216,6 +216,8 @@ struct vcpu /* VCPU paused for mem_event replies. */ atomic_t mem_event_pause_count; + /* VCPU paused by system controller. */ + int controller_pause_count; /* IRQ-safe virq_lock protects against delivering VIRQ to stale evtchn. */ evtchn_port_t virq_to_evtchn[NR_VIRQS]; @@ -768,9 +770,12 @@ void vcpu_block(void); void vcpu_unblock(struct vcpu *v); void vcpu_pause(struct vcpu *v); void vcpu_pause_nosync(struct vcpu *v); +void vcpu_unpause(struct vcpu *v); +int vcpu_pause_by_systemcontroller(struct vcpu *v); +int vcpu_unpause_by_systemcontroller(struct vcpu *v); + void domain_pause(struct domain *d); void domain_pause_nosync(struct domain *d); -void vcpu_unpause(struct vcpu *v); void domain_unpause(struct domain *d); int domain_unpause_by_systemcontroller(struct domain *d); int __domain_pause_by_systemcontroller(struct domain *d, -- 1.7.10.4