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akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, willy@infradead.org, mgorman@suse.de, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, jgross@suse.com, andrew.cooper3@citrix.com, mingo@kernel.org, bristot@kernel.org, mathieu.desnoyers@efficios.com, geert@linux-m68k.org, glaubitz@physik.fu-berlin.de, anton.ivanov@cambridgegreys.com, mattst88@gmail.com, krypton@ulrich-teichert.org, rostedt@goodmis.org, David.Laight@ACULAB.COM, richard@nod.at, mjguzik@gmail.com, Ankur Arora Subject: [RFC PATCH 33/86] entry/kvm: handle TIF_NEED_RESCHED_LAZY Date: Tue, 7 Nov 2023 13:57:19 -0800 Message-Id: <20231107215742.363031-34-ankur.a.arora@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20231107215742.363031-1-ankur.a.arora@oracle.com> References: <20231107215742.363031-1-ankur.a.arora@oracle.com> 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X-MS-Exchange-CrossTenant-AuthSource: CO6PR10MB5409.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Nov 2023 21:59:25.6053 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: GU/w1Byy4BTjU99GQQoJx2r8jfAVHXpKo0DI16pfh1GOgvEPN2AlpVxfp5DHbgAYwdFLhR5Ocl6JaAdnzrlDRFzh+8bavRErvoQi2/3mENs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR10MB6141 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-07_13,2023-11-07_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxlogscore=685 mlxscore=0 adultscore=0 phishscore=0 suspectscore=0 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311070182 X-Proofpoint-GUID: 8LIYsEx4CFEbCZXTJGr-E7wjx8Sw9P-L X-Proofpoint-ORIG-GUID: 8LIYsEx4CFEbCZXTJGr-E7wjx8Sw9P-L Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Executing in xfer_to_guest_mode_work() we are free of kernel entanglements that cannot span preemption. So, handle TIF_NEED_RESCHED_LAZY alongside TIF_NEED_RESCHED. Also, while we at it, remove the explicit check for need_resched() in the exit condition as that is already covered in the loop condition. Originally-by: Thomas Gleixner Signed-off-by: Ankur Arora --- include/linux/entry-kvm.h | 2 +- kernel/entry/kvm.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/include/linux/entry-kvm.h b/include/linux/entry-kvm.h index 6813171afccb..674a622c91be 100644 --- a/include/linux/entry-kvm.h +++ b/include/linux/entry-kvm.h @@ -18,7 +18,7 @@ =20 #define XFER_TO_GUEST_MODE_WORK \ (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \ - _TIF_NOTIFY_RESUME | ARCH_XFER_TO_GUEST_MODE_WORK) + _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED_LAZY | ARCH_XFER_TO_GUEST_MODE_WO= RK) =20 struct kvm_vcpu; =20 diff --git a/kernel/entry/kvm.c b/kernel/entry/kvm.c index 2e0f75bcb7fd..8485f63863af 100644 --- a/kernel/entry/kvm.c +++ b/kernel/entry/kvm.c @@ -13,7 +13,7 @@ static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu,= unsigned long ti_work) return -EINTR; } =20 - if (ti_work & _TIF_NEED_RESCHED) + if (ti_work & (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)) schedule(); =20 if (ti_work & _TIF_NOTIFY_RESUME) @@ -24,7 +24,7 @@ static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu,= unsigned long ti_work) return ret; =20 ti_work =3D read_thread_flags(); - } while (ti_work & XFER_TO_GUEST_MODE_WORK || need_resched()); + } while (ti_work & XFER_TO_GUEST_MODE_WORK); return 0; } =20 --=20 2.31.1