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Sat, 30 May 2020 23:44:10 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3030.oracle.com with ESMTP id 31c12jgbdn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 30 May 2020 23:44:10 +0000 Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 04UNi9wl021788; Sat, 30 May 2020 23:44:09 GMT Received: from [10.39.241.21] (/10.39.241.21) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Sat, 30 May 2020 16:44:08 -0700 Subject: Re: [PATCH 09/12] x86/xen: save and restore steal clock To: Anchal Agarwal , tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org, jgross@suse.com, linux-pm@vger.kernel.org, linux-mm@kvack.org, kamatam@amazon.com, sstabellini@kernel.org, konrad.wilk@oracle.com, roger.pau@citrix.com, axboe@kernel.dk, davem@davemloft.net, rjw@rjwysocki.net, len.brown@intel.com, pavel@ucw.cz, peterz@infradead.org, eduval@amazon.com, sblbir@amazon.com, xen-devel@lists.xenproject.org, vkuznets@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, dwmw@amazon.co.uk, benh@kernel.crashing.org References: <6f39a1594a25ab5325f34e1e297900d699cd92bf.1589926004.git.anchalag@amazon.com> From: Boris Ostrovsky Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <6f39a1594a25ab5325f34e1e297900d699cd92bf.1589926004.git.anchalag@amazon.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9637 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 phishscore=0 malwarescore=0 adultscore=0 suspectscore=0 spamscore=0 bulkscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005300185 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9637 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 clxscore=1015 lowpriorityscore=0 malwarescore=0 phishscore=0 suspectscore=0 priorityscore=1501 adultscore=0 mlxlogscore=999 cotscore=-2147483648 bulkscore=0 mlxscore=0 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005300185 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/19/20 7:28 PM, Anchal Agarwal wrote: > From: Munehisa Kamata > > Save steal clock values of all present CPUs in the system core ops > suspend callbacks. Also, restore a boot CPU's steal clock in the system= > core resume callback. For non-boot CPUs, restore after they're brought > up, because runstate info for non-boot CPUs are not active until then. > > Signed-off-by: Munehisa Kamata > Signed-off-by: Anchal Agarwal > --- > arch/x86/xen/suspend.c | 13 ++++++++++++- > arch/x86/xen/time.c | 3 +++ > 2 files changed, 15 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c > index 784c4484100b..dae0f74f5390 100644 > --- a/arch/x86/xen/suspend.c > +++ b/arch/x86/xen/suspend.c > @@ -91,12 +91,20 @@ void xen_arch_suspend(void) > static int xen_syscore_suspend(void) > { > struct xen_remove_from_physmap xrfp; > - int ret; > + int cpu, ret; > =20 > /* Xen suspend does similar stuffs in its own logic */ > if (xen_suspend_mode_is_xen_suspend()) > return 0; > =20 > + for_each_present_cpu(cpu) { > + /* > + * Nonboot CPUs are already offline, but the last copy of > + * runstate info is still accessible. > + */ > + xen_save_steal_clock(cpu); > + } > + > xrfp.domid =3D DOMID_SELF; > xrfp.gpfn =3D __pa(HYPERVISOR_shared_info) >> PAGE_SHIFT; > =20 > @@ -118,6 +126,9 @@ static void xen_syscore_resume(void) > =20 > pvclock_resume(); Doesn't make any difference but I think since this patch is where you are dealing with clock then pvclock_resume() should be added here and not in the earlier patch. -boris > =20 > + /* Nonboot CPUs will be resumed when they're brought up */ > + xen_restore_steal_clock(smp_processor_id()); > + > gnttab_resume(); > } > =20 > diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c > index c8897aad13cd..33d754564b09 100644 > --- a/arch/x86/xen/time.c > +++ b/arch/x86/xen/time.c > @@ -545,6 +545,9 @@ static void xen_hvm_setup_cpu_clockevents(void) > { > int cpu =3D smp_processor_id(); > xen_setup_runstate_info(cpu); > + if (cpu) > + xen_restore_steal_clock(cpu); > + > /* > * xen_setup_timer(cpu) - snprintf is bad in atomic context. Hence > * doing it xen_hvm_cpu_notify (which gets called by smp_init during