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d="scan'208";a="55693165" Date: Thu, 2 Jul 2020 18:22:05 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v2 04/11] x86/xen: add system core suspend and resume callbacks Message-ID: <20200702182205.GA3531@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Precedence: Bulk X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: pass (identity @amazon.com) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Munehisa Kamata Add Xen PVHVM specific system core callbacks for PM hibernation support. The callbacks suspend and resume Xen primitives like shared_info, pvclock and grant table. These syscore_ops are specifically for domU hibernation. xen_suspend() calls syscore_suspend() during Xen suspend operation however, during xen suspend lock_system_sleep() lock is taken and thus system cannot trigger hibernation. These system core callbacks will be called only from the hibernation context. [Anchal Agarwal: Changelog]: v1->v2: Edit commit message Fixed syscore_suspend() to call gnntab_suspend Removed suspend mode check in syscore_suspend()/ syscore_resume() Signed-off-by: Agarwal Anchal Signed-off-by: Munehisa Kamata --- arch/x86/xen/enlighten_hvm.c | 1 + arch/x86/xen/suspend.c | 47 ++++++++++++++++++++++++++++++++++++ include/xen/xen-ops.h | 2 ++ 3 files changed, 50 insertions(+) diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c index d91099928746..bd6bf6eb2052 100644 --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -215,6 +215,7 @@ static void __init xen_hvm_guest_init(void) if (xen_feature(XENFEAT_hvm_callback_vector)) xen_have_vector_callback =3D 1; =20 + xen_setup_syscore_ops(); xen_hvm_smp_init(); WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_hvm, xen_cpu_dead_hvm)); xen_unplug_emulated_devices(); diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c index 1d83152c761b..e8c924e93fc5 100644 --- a/arch/x86/xen/suspend.c +++ b/arch/x86/xen/suspend.c @@ -2,17 +2,22 @@ #include #include #include +#include +#include =20 #include #include +#include #include #include +#include =20 #include #include #include #include #include +#include =20 #include "xen-ops.h" #include "mmu.h" @@ -82,3 +87,45 @@ void xen_arch_suspend(void) =20 on_each_cpu(xen_vcpu_notify_suspend, NULL, 1); } + +static int xen_syscore_suspend(void) +{ + struct xen_remove_from_physmap xrfp; + int ret; + + gnttab_suspend(); + + xrfp.domid =3D DOMID_SELF; + xrfp.gpfn =3D __pa(HYPERVISOR_shared_info) >> PAGE_SHIFT; + + ret =3D HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrfp); + if (!ret) + HYPERVISOR_shared_info =3D &xen_dummy_shared_info; + + return ret; +} + +static void xen_syscore_resume(void) +{ + /* No need to setup vcpu_info as it's already moved off */ + xen_hvm_map_shared_info(); + + pvclock_resume(); + + gnttab_resume(); +} + +/* + * These callbacks will be called with interrupts disabled and when having= only + * one CPU online. + */ +static struct syscore_ops xen_hvm_syscore_ops =3D { + .suspend =3D xen_syscore_suspend, + .resume =3D xen_syscore_resume +}; + +void __init xen_setup_syscore_ops(void) +{ + if (xen_hvm_domain()) + register_syscore_ops(&xen_hvm_syscore_ops); +} diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h index 2521d6a306cd..9fa8a4082d68 100644 --- a/include/xen/xen-ops.h +++ b/include/xen/xen-ops.h @@ -41,6 +41,8 @@ u64 xen_steal_clock(int cpu); int xen_setup_shutdown_event(void); =20 bool xen_is_xen_suspend(void); +void xen_setup_syscore_ops(void); + extern unsigned long *xen_contiguous_bitmap; =20 #if defined(CONFIG_XEN_PV) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) --=20 2.20.1