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From: "Peng Fan (OSS)" To: sstabellini@kernel.org, anthony.perard@citrix.com, paul@xen.org, vikram.garhwal@amd.com, viresh.kumar@linaro.org Cc: xen-devel@lists.xenproject.org, qemu-devel@nongnu.org, Peng Fan Subject: [PATCH V2] xen: Drop out of coroutine context xen_invalidate_map_cache_entry Date: Wed, 24 Jan 2024 10:14:50 +0800 Message-Id: <20240124021450.21656-1-peng.fan@oss.nxp.com> X-Mailer: git-send-email 2.35.3 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MA0PR01CA0089.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:ae::15) To DU0PR04MB9417.eurprd04.prod.outlook.com (2603:10a6:10:358::11) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DU0PR04MB9417:EE_|AM8PR04MB7762:EE_ X-MS-Office365-Filtering-Correlation-Id: 2c19dfd0-2a01-4ea2-b171-08dc1c7a39d0 X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DU0PR04MB9417.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(136003)(366004)(376002)(39860400002)(396003)(346002)(230922051799003)(1800799012)(451199024)(64100799003)(186009)(52116002)(8936002)(8676002)(6506007)(6666004)(478600001)(66556008)(66946007)(6486002)(66476007)(316002)(2616005)(1076003)(6512007)(83380400001)(4326008)(41300700001)(5660300002)(2906002)(86362001)(26005)(38350700005)(38100700002);DIR:OUT;SFP:1101; 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charset="utf-8" From: Peng Fan xen_invalidate_map_cache_entry is not expected to run in a coroutine. Without this, there is crash: signo=3Dsigno@entry=3D6, no_tid=3Dno_tid@entry=3D0) at pthread_kill.c:44 threadid=3D) at pthread_kill.c:78 at /usr/src/debug/glibc/2.38+git-r0/sysdeps/posix/raise.c:26 fmt=3D0xffff9e1ca8a8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=3Dassertion@entry=3D0xaaaae0d25740 "!qemu_in_coroutine()", file=3Dfile@entry=3D0xaaaae0d301a8 "../qemu-xen-dir-remote/block/graph-= lock.c", line=3Dline@entry=3D260, function=3Dfunction@entry=3D0xaaaae0e522c0 <__PRETTY_FUNCTION__.3> "bdr= v_graph_rdlock_main_loop") at assert.c:92 assertion=3Dassertion@entry=3D0xaaaae0d25740 "!qemu_in_coroutine()", file=3Dfile@entry=3D0xaaaae0d301a8 "../qemu-xen-dir-remote/block/graph-= lock.c", line=3Dline@entry=3D260, function=3Dfunction@entry=3D0xaaaae0e522c0 <__PRETTY_FUNCTION__.3> "bdr= v_graph_rdlock_main_loop") at assert.c:101 at ../qemu-xen-dir-remote/block/graph-lock.c:260 at /home/Freenix/work/sw-stash/xen/upstream/tools/qemu-xen-dir-remote/i= nclude/block/graph-lock.h:259 host=3Dhost@entry=3D0xffff742c8000, size=3Dsize@entry=3D2097152) at ../qemu-xen-dir-remote/block/io.c:3362 host=3D0xffff742c8000, size=3D2097152) at ../qemu-xen-dir-remote/block/block-backend.c:2859 host=3D, size=3D, max_size=3D) at ../qemu-xen-dir-remote/block/block-ram-registrar.c:33 size=3D2097152, max_size=3D2097152) at ../qemu-xen-dir-remote/hw/core/numa.c:883 buffer=3Dbuffer@entry=3D0xffff743c5000 "") at ../qemu-xen-dir-remote/hw/xen/xen-mapcache.c:475 buffer=3Dbuffer@entry=3D0xffff743c5000 "") at ../qemu-xen-dir-remote/hw/xen/xen-mapcache.c:487 as=3Das@entry=3D0xaaaae1ca3ae8 , buffer=3D0xffff7= 43c5000, len=3D, is_write=3Dis_write@entry=3Dtrue, access_len=3Daccess_len@entry=3D32768) at ../qemu-xen-dir-remote/system/physmem.c:3199 dir=3DDMA_DIRECTION_FROM_DEVICE, len=3D, buffer=3D, as=3D0xaaaae1ca3ae8 ) at /home/Freenix/work/sw-stash/xen/upstream/tools/qemu-xen-dir-remote/i= nclude/sysemu/dma.h:236 elem=3Delem@entry=3D0xaaaaf620aa30, len=3Dlen@entry=3D32769) at ../qemu-xen-dir-remote/hw/virtio/virtio.c:758 elem=3Delem@entry=3D0xaaaaf620aa30, len=3Dlen@entry=3D32769, idx=3Didx@= entry=3D0) at ../qemu-xen-dir-remote/hw/virtio/virtio.c:919 elem=3Delem@entry=3D0xaaaaf620aa30, len=3D32769) at ../qemu-xen-dir-remote/hw/virtio/virtio.c:994 req=3Dreq@entry=3D0xaaaaf620aa30, status=3Dstatus@entry=3D0 '\000') at ../qemu-xen-dir-remote/hw/block/virtio-blk.c:67 ret=3D0) at ../qemu-xen-dir-remote/hw/block/virtio-blk.c:136 at ../qemu-xen-dir-remote/block/block-backend.c:1559 --Type for more, q to quit, c to continue without paging-- at ../qemu-xen-dir-remote/block/block-backend.c:1614 i1=3D) at ../qemu-xen-dir-remote/util/coroutine-ucontext= .c:177 at ../sysdeps/unix/sysv/linux/aarch64/setcontext.S:123 Signed-off-by: Peng Fan Reviewed-by: Stefano Stabellini --- V2: Drop unused ret in XenMapCacheData (thanks Stefano) hw/xen/xen-mapcache.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) diff --git a/hw/xen/xen-mapcache.c b/hw/xen/xen-mapcache.c index f7d974677d..8d62b3d2ed 100644 --- a/hw/xen/xen-mapcache.c +++ b/hw/xen/xen-mapcache.c @@ -481,11 +481,37 @@ static void xen_invalidate_map_cache_entry_unlocked(u= int8_t *buffer) g_free(entry); } =20 -void xen_invalidate_map_cache_entry(uint8_t *buffer) +typedef struct XenMapCacheData { + Coroutine *co; + uint8_t *buffer; +} XenMapCacheData; + +static void xen_invalidate_map_cache_entry_bh(void *opaque) { + XenMapCacheData *data =3D opaque; + mapcache_lock(); - xen_invalidate_map_cache_entry_unlocked(buffer); + xen_invalidate_map_cache_entry_unlocked(data->buffer); mapcache_unlock(); + + aio_co_wake(data->co); +} + +void coroutine_mixed_fn xen_invalidate_map_cache_entry(uint8_t *buffer) +{ + if (qemu_in_coroutine()) { + XenMapCacheData data =3D { + .co =3D qemu_coroutine_self(), + .buffer =3D buffer, + }; + aio_bh_schedule_oneshot(qemu_get_current_aio_context(), + xen_invalidate_map_cache_entry_bh, &data); + qemu_coroutine_yield(); + } else { + mapcache_lock(); + xen_invalidate_map_cache_entry_unlocked(buffer); + mapcache_unlock(); + } } =20 void xen_invalidate_map_cache(void) --=20 2.35.3