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[85.223.209.22]) by smtp.gmail.com with ESMTPSA id m25sm629438ljj.92.2019.05.24.11.12.58 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 24 May 2019 11:12:59 -0700 (PDT) X-Inumbo-ID: 9101c14b-7e4f-11e9-8980-bc764e045a96 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=1VhFGqpRzYi36j0UdsAC5u3jd3GfJ2G+kRwRwEcdc1s=; b=SSg6jnrLlQg9Gdu8xPp7SwIaxEFRHE7ImaNawJ5oAhJRpxWRJlQhI00kwWOKIeWjrt Kdi9NcTTvPZCP8CJT8u22+/c2Bp14cqS1ICaKH7r9vj9aqJ5eLJE6ChPA5aaGO1WTItF MrKg+jrSR6RcDFILMRHPcLlmo0UJaGxTTfWJ1IlmmpBxqR4Dps60lTqEoIJ2iSQpMbAK Rs5DWzkeXkUYCgs+k4yKdSk65ok+b0bvNuyZbIOyOF5wO2wnZn4ngEB8s/Tx94Dul9ly gcz/6jh52tBFNJlT7dOVKriWNqlLWaRRXYjXQdAK182csUZ0zwPjZhK//MhBT5/TzqS6 Lixw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=1VhFGqpRzYi36j0UdsAC5u3jd3GfJ2G+kRwRwEcdc1s=; b=GVct12bcM2boDKmOV78TGujtmTdfpCX5k2YD7tLtbDNZyQS3ebIjeM2U81k/TQx/sG fIWcFF5HYs9+0bFvb9vPMAetONjuzcZ2IUBoCtAm7AUbtk/EEkGk26F/XgAnQd0cH3pe JUIk6pHN+7tCRehsg0QZALIT3sDoUxCu3bhInM6UHEPejXHY+R23jnZBXVttRgcg0DSD lIK6UJVNCCOr8mJJL/ABjCkB5jNfJqRu3OnSm/HlcVyevHWxSbBVvCL0P3K3oPUFMrL3 mDFetAiqCZEmtVjl5De6eD9vI8nlulAGD9CtEgl9+ODZ7nr9zAOK4mUBo59B4LkuKoot Z1eQ== X-Gm-Message-State: APjAAAUumn5QXsS3FhpI0xotCG8kJYHjpoXT+i1YVWyJyI2mteTz+Nxx KeWGCikVm3yNxXfemF6El/k= X-Google-Smtp-Source: APXvYqwQXezgNJ4ZHOtmb0vBiUcYIaKn7Eo0PNkuaif5t0zFk9vUMaqukHqO1WLc3yl+xqZbqJg5uQ== X-Received: by 2002:a19:6b04:: with SMTP id d4mr23648108lfa.57.1558721580500; Fri, 24 May 2019 11:13:00 -0700 (PDT) From: Andrii Anisov To: Date: Fri, 24 May 2019 21:12:54 +0300 Message-Id: <1558721577-13958-1-git-send-email-andrii.anisov@gmail.com> X-Mailer: git-send-email 2.7.4 Subject: [Xen-devel] [PATCH RFC 2] [DO NOT APPLY] introduce VCPUOP_register_runstate_phys_memory_area hypercall X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Andrii Anisov , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Tim Deegan , Julien Grall , Jan Beulich , xen-devel@lists.xenproject.org, Wei Liu MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) From: Andrii Anisov An RFC version of the runstate registration with phys address. Runstate area access is implemented with mapping on each update once for all accesses. Signed-off-by: Andrii Anisov --- xen/arch/arm/domain.c | 63 ++++++++++++++++++++++++++--- xen/common/domain.c | 101 ++++++++++++++++++++++++++++++++++++++++++= ++-- xen/include/public/vcpu.h | 15 +++++++ xen/include/xen/sched.h | 28 +++++++++---- 4 files changed, 190 insertions(+), 17 deletions(-) diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c index a9f7ff5..04c4cff 100644 --- a/xen/arch/arm/domain.c +++ b/xen/arch/arm/domain.c @@ -274,17 +274,15 @@ static void ctxt_switch_to(struct vcpu *n) virt_timer_restore(n); } =20 -/* Update per-VCPU guest runstate shared memory area (if registered). */ -static void update_runstate_area(struct vcpu *v) +static void update_runstate_by_gvaddr(struct vcpu *v) { void __user *guest_handle =3D NULL; =20 - if ( guest_handle_is_null(runstate_guest(v)) ) - return; + ASSERT(!guest_handle_is_null(runstate_guest_virt(v))); =20 if ( VM_ASSIST(v->domain, runstate_update_flag) ) { - guest_handle =3D &v->runstate_guest.p->state_entry_time + 1; + guest_handle =3D &v->runstate_guest.virt.p->state_entry_time + 1; guest_handle--; v->runstate.state_entry_time |=3D XEN_RUNSTATE_UPDATE; __raw_copy_to_guest(guest_handle, @@ -292,7 +290,7 @@ static void update_runstate_area(struct vcpu *v) smp_wmb(); } =20 - __copy_to_guest(runstate_guest(v), &v->runstate, 1); + __copy_to_guest(runstate_guest_virt(v), &v->runstate, 1); =20 if ( guest_handle ) { @@ -303,6 +301,58 @@ static void update_runstate_area(struct vcpu *v) } } =20 +extern int map_runstate_area(struct vcpu *v, struct vcpu_runstate_info **a= rea); +extern void unmap_runstate_area(struct vcpu_runstate_info *area); + +static void update_runstate_by_gpaddr(struct vcpu *v) +{ + struct vcpu_runstate_info *runstate; + + if ( map_runstate_area(v, &runstate) ) + return; + + if ( VM_ASSIST(v->domain, runstate_update_flag) ) + { + runstate->state_entry_time |=3D XEN_RUNSTATE_UPDATE; + smp_wmb(); + v->runstate.state_entry_time |=3D XEN_RUNSTATE_UPDATE; + } + + memcpy(runstate, &v->runstate, sizeof(v->runstate)); + + if ( VM_ASSIST(v->domain, runstate_update_flag) ) + { + runstate->state_entry_time &=3D ~XEN_RUNSTATE_UPDATE; + smp_wmb(); + v->runstate.state_entry_time &=3D ~XEN_RUNSTATE_UPDATE; + } + + unmap_runstate_area(runstate); +} + +/* Update per-VCPU guest runstate shared memory area (if registered). */ +static void update_runstate_area(struct vcpu *v) +{ + if ( xchg(&v->runstate_in_use, 1) ) + return; + + switch ( v->runstate_guest_type ) + { + case RUNSTATE_NONE: + break; + + case RUNSTATE_VADDR: + update_runstate_by_gvaddr(v); + break; + + case RUNSTATE_PADDR: + update_runstate_by_gpaddr(v); + break; + } + + xchg(&v->runstate_in_use, 0); +} + static void schedule_tail(struct vcpu *prev) { ctxt_switch_from(prev); @@ -998,6 +1048,7 @@ long do_arm_vcpu_op(int cmd, unsigned int vcpuid, XEN_= GUEST_HANDLE_PARAM(void) a { case VCPUOP_register_vcpu_info: case VCPUOP_register_runstate_memory_area: + case VCPUOP_register_runstate_phys_memory_area: return do_vcpu_op(cmd, vcpuid, arg); default: return -EINVAL; diff --git a/xen/common/domain.c b/xen/common/domain.c index 32bca8d..f167a68 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -700,6 +700,68 @@ int rcu_lock_live_remote_domain_by_id(domid_t dom, str= uct domain **d) return 0; } =20 +void unmap_runstate_area(struct vcpu_runstate_info *area) +{ + mfn_t mfn; + + ASSERT(area !=3D NULL); + + mfn =3D _mfn(domain_page_map_to_mfn(area)); + + unmap_domain_page_global((void *) + ((unsigned long)area & + PAGE_MASK)); + + put_page_and_type(mfn_to_page(mfn)); +} + +int map_runstate_area(struct vcpu *v, struct vcpu_runstate_info **area) +{ + unsigned long offset =3D v->runstate_guest.phys & ~PAGE_MASK; + gfn_t gfn =3D gaddr_to_gfn(v->runstate_guest.phys); + struct domain *d =3D v->domain; + void *mapping; + struct page_info *page; + size_t size =3D sizeof(struct vcpu_runstate_info); + + if ( offset > (PAGE_SIZE - size) ) + return -EINVAL; + + page =3D get_page_from_gfn(d, gfn_x(gfn), NULL, P2M_ALLOC); + if ( !page ) + return -EINVAL; + + if ( !get_page_type(page, PGT_writable_page) ) + { + put_page(page); + return -EINVAL; + } + + mapping =3D __map_domain_page_global(page); + + if ( mapping =3D=3D NULL ) + { + put_page_and_type(page); + return -ENOMEM; + } + + *area =3D mapping + offset; + + return 0; +} + +static void discard_runstate_area(struct vcpu *v) +{ + v->runstate_guest_type =3D RUNSTATE_NONE; +} + +static void discard_runstate_area_locked(struct vcpu *v) +{ + while ( xchg(&v->runstate_in_use, 1) ); + discard_runstate_area(v); + xchg(&v->runstate_in_use, 0); +} + int domain_kill(struct domain *d) { int rc =3D 0; @@ -738,7 +800,10 @@ int domain_kill(struct domain *d) if ( cpupool_move_domain(d, cpupool0) ) return -ERESTART; for_each_vcpu ( d, v ) + { + discard_runstate_area_locked(v); unmap_vcpu_info(v); + } d->is_dying =3D DOMDYING_dead; /* Mem event cleanup has to go here because the rings=20 * have to be put before we call put_domain. */ @@ -1192,7 +1257,7 @@ int domain_soft_reset(struct domain *d) =20 for_each_vcpu ( d, v ) { - set_xen_guest_handle(runstate_guest(v), NULL); + discard_runstate_area_locked(v); unmap_vcpu_info(v); } =20 @@ -1520,18 +1585,46 @@ long do_vcpu_op(int cmd, unsigned int vcpuid, XEN_G= UEST_HANDLE_PARAM(void) arg) break; =20 rc =3D 0; - runstate_guest(v) =3D area.addr.h; + + while( xchg(&v->runstate_in_use, 1) =3D=3D 0); + + discard_runstate_area(v); + + runstate_guest_virt(v) =3D area.addr.h; + v->runstate_guest_type =3D RUNSTATE_VADDR; =20 if ( v =3D=3D current ) { - __copy_to_guest(runstate_guest(v), &v->runstate, 1); + __copy_to_guest(runstate_guest_virt(v), &v->runstate, 1); } else { vcpu_runstate_get(v, &runstate); - __copy_to_guest(runstate_guest(v), &runstate, 1); + __copy_to_guest(runstate_guest_virt(v), &runstate, 1); } =20 + xchg(&v->runstate_in_use, 0); + + break; + } + + case VCPUOP_register_runstate_phys_memory_area: + { + struct vcpu_register_runstate_memory_area area; + + rc =3D -EFAULT; + if ( copy_from_guest(&area, arg, 1) ) + break; + + while( xchg(&v->runstate_in_use, 1) =3D=3D 0); + + discard_runstate_area(v); + v->runstate_guest.phys =3D area.addr.p; + v->runstate_guest_type =3D RUNSTATE_PADDR; + + xchg(&v->runstate_in_use, 0); + rc =3D 0; + break; } =20 diff --git a/xen/include/public/vcpu.h b/xen/include/public/vcpu.h index 3623af9..d7da4a3 100644 --- a/xen/include/public/vcpu.h +++ b/xen/include/public/vcpu.h @@ -235,6 +235,21 @@ struct vcpu_register_time_memory_area { typedef struct vcpu_register_time_memory_area vcpu_register_time_memory_ar= ea_t; DEFINE_XEN_GUEST_HANDLE(vcpu_register_time_memory_area_t); =20 +/* + * Register a shared memory area from which the guest may obtain its own + * runstate information without needing to execute a hypercall. + * Notes: + * 1. The registered address must be guest's physical address. + * 2. The registered runstate area should not cross page boundary. + * 3. Only one shared area may be registered per VCPU. The shared area is + * updated by the hypervisor each time the VCPU is scheduled. Thus + * runstate.state will always be RUNSTATE_running and + * runstate.state_entry_time will indicate the system time at which the + * VCPU was last scheduled to run. + * @extra_arg =3D=3D pointer to vcpu_register_runstate_memory_area structu= re. + */ +#define VCPUOP_register_runstate_phys_memory_area 14 + #endif /* __XEN_PUBLIC_VCPU_H__ */ =20 /* diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index edee52d..8ac597b 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -163,17 +163,31 @@ struct vcpu void *sched_priv; /* scheduler-specific data */ =20 struct vcpu_runstate_info runstate; + + enum { + RUNSTATE_NONE =3D 0, + RUNSTATE_PADDR =3D 1, + RUNSTATE_VADDR =3D 2, + } runstate_guest_type; + + unsigned long runstate_in_use; + + union + { #ifndef CONFIG_COMPAT -# define runstate_guest(v) ((v)->runstate_guest) - XEN_GUEST_HANDLE(vcpu_runstate_info_t) runstate_guest; /* guest addres= s */ +# define runstate_guest_virt(v) ((v)->runstate_guest.virt) + XEN_GUEST_HANDLE(vcpu_runstate_info_t) virt; /* guest address */ #else -# define runstate_guest(v) ((v)->runstate_guest.native) - union { - XEN_GUEST_HANDLE(vcpu_runstate_info_t) native; - XEN_GUEST_HANDLE(vcpu_runstate_info_compat_t) compat; - } runstate_guest; /* guest address */ +# define runstate_guest_virt(v) ((v)->runstate_guest.virt.native) + union { + XEN_GUEST_HANDLE(vcpu_runstate_info_t) native; + XEN_GUEST_HANDLE(vcpu_runstate_info_compat_t) compat; + } virt; /* guest address */ #endif =20 + paddr_t phys; + } runstate_guest; + /* last time when vCPU is scheduled out */ uint64_t last_run_time; =20 --=20 2.7.4 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel