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From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Andrew Cooper , Anthony PERARD , Michal Orzel , Jan Beulich , Julien Grall , Stefano Stabellini Subject: [PATCH v4 1/3] xen/mm: enforce SCRUB_DEBUG checks for MEMF_no_scrub allocations Date: Wed, 28 Jan 2026 13:03:37 +0100 Message-ID: <20260128120339.47373-2-roger.pau@citrix.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260128120339.47373-1-roger.pau@citrix.com> References: <20260128120339.47373-1-roger.pau@citrix.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MR2P264CA0182.FRAP264.PROD.OUTLOOK.COM (2603:10a6:501::21) To CH7PR03MB7860.namprd03.prod.outlook.com (2603:10b6:610:24e::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH7PR03MB7860:EE_|LV3PR03MB7357:EE_ X-MS-Office365-Filtering-Correlation-Id: 588aec5d-2056-440e-b27e-08de5e654b0e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; 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However already scrubbed pages can be checked for correctness, regardless of the caller having requested MEMF_no_scrub. Relax the checking around the check_one_page() call, to allow for calls with MEMF_no_scrub to also check the correctness of pages marked as already scrubbed when allocated. This widens the checking of scrubbing correctness, so it would also check the scrubbing correctness of MEMF_no_scrub allocations. Signed-off-by: Roger Pau Monn=C3=A9 --- After discussing with Jan I've deliberately omitted the tag: Fixes: 0c5f2f9cefac ("mm: Make sure pages are scrubbed") The intended approach might have been to ensure the caller of alloc_heap_pages() gets properly scrubbed pages, rather than asserting the internal state of free pages is as expected. --- xen/common/page_alloc.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index 2efc11ce095f..de1480316f05 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -1105,8 +1105,7 @@ static struct page_info *alloc_heap_pages( =20 spin_unlock(&heap_lock); =20 - if ( first_dirty !=3D INVALID_DIRTY_IDX || - (scrub_debug && !(memflags & MEMF_no_scrub)) ) + if ( first_dirty !=3D INVALID_DIRTY_IDX || scrub_debug ) { bool cold =3D d && d !=3D current->domain; =20 @@ -1119,7 +1118,7 @@ static struct page_info *alloc_heap_pages( =20 dirty_cnt++; } - else if ( !(memflags & MEMF_no_scrub) ) + else check_one_page(&pg[i]); 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From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Roger Pau Monne , Andrew Cooper , Anthony PERARD , Michal Orzel , Jan Beulich , Julien Grall , Stefano Stabellini Subject: [PATCH v4 2/3] xen/mm: allow deferred scrub of physmap populate allocated pages Date: Wed, 28 Jan 2026 13:03:38 +0100 Message-ID: <20260128120339.47373-3-roger.pau@citrix.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260128120339.47373-1-roger.pau@citrix.com> References: <20260128120339.47373-1-roger.pau@citrix.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MR1P264CA0007.FRAP264.PROD.OUTLOOK.COM (2603:10a6:501:2e::12) To CH7PR03MB7860.namprd03.prod.outlook.com (2603:10b6:610:24e::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH7PR03MB7860:EE_|LV3PR03MB7357:EE_ X-MS-Office365-Filtering-Correlation-Id: 277c2970-bc93-4deb-cf95-08de5e654d3e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; 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However that triggers issues when big enough pages are not yet scrubbed, and so scrubbing must be done at allocation time. On some scenarios with added contention the watchdog can trigger: Watchdog timer detects that CPU55 is stuck! ----[ Xen-4.17.5-21 x86_64 debug=3Dn Not tainted ]---- CPU: 55 RIP: e008:[] clear_page_sse2+0x1a/0x30 RFLAGS: 0000000000000202 CONTEXT: hypervisor (d0v12) [...] Xen call trace: [] R clear_page_sse2+0x1a/0x30 [] S clear_domain_page+0x11/0x20 [] S common/page_alloc.c#alloc_heap_pages+0x400/0x5a0 [] S alloc_domheap_pages+0x67/0x180 [] S common/memory.c#populate_physmap+0x22f/0x3b0 [] S do_memory_op+0x728/0x1970 Introduce a mechanism to preempt page scrubbing in populate_physmap(). It relies on stashing the dirty page in the domain struct temporarily to preempt to guest context, so the scrubbing can resume when the domain re-enters the hypercall. The added deferral mechanism will only be used for domain construction, and is designed to be used with a single threaded domain builder. If the toolstack makes concurrent calls to XENMEM_populate_physmap for the same target domain it will trash stashed pages, resulting in slow domain physmap population. Note a similar issue is present in increase reservation. However that hypercall is likely to only be used once the domain is already running and the known implementations use 4K pages. It will be deal with in a separate patch using a different approach, that will also take care of the allocation in populate_physmap() once the domain is running. Fixes: 74d2e11ccfd2 ("mm: Scrub pages in alloc_heap_pages() if needed") Signed-off-by: Roger Pau Monn=C3=A9 --- Changes since v3: - Introduce helper to free stashed pages. - Attempt to free stashed pages from domain_unpause_by_systemcontroller() also. - Free stashed page in get_stashed_allocation() if it doesn't match the requested parameters. Changes since v2: - Introduce FREE_DOMHEAP_PAGE{,S}(). - Remove j local counter. - Free page pending scrub in domain_kill() also. - Remove BUG_ON(). - Reorder get_stashed_allocation() flow. - s/dirty/unscrubbed/ in a printk message. Changes since v1: - New in this version, different approach than v1. --- xen/common/domain.c | 30 ++++++++++++ xen/common/memory.c | 101 +++++++++++++++++++++++++++++++++++++++- xen/common/page_alloc.c | 2 +- xen/include/xen/mm.h | 10 ++++ xen/include/xen/sched.h | 5 ++ 5 files changed, 146 insertions(+), 2 deletions(-) diff --git a/xen/common/domain.c b/xen/common/domain.c index 376351b528c9..123202f2c025 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -710,6 +710,23 @@ static int domain_teardown(struct domain *d) return 0; } =20 +/* + * Called multiple times during domain destruction, to attempt to early fr= ee + * any stashed pages to be scrubbed. The call from _domain_destroy() is d= one + * when the toolstack can no longer stash any pages. + */ +static void domain_free_pending_scrub(struct domain *d) +{ + rspin_lock(&d->page_alloc_lock); + if ( d->pending_scrub ) + { + FREE_DOMHEAP_PAGES(d->pending_scrub, d->pending_scrub_order); + d->pending_scrub_order =3D 0; + d->pending_scrub_index =3D 0; + } + rspin_unlock(&d->page_alloc_lock); +} + /* * Destroy a domain once all references to it have been dropped. Used eit= her * from the RCU path, or from the domain_create() error path before the do= main @@ -722,6 +739,8 @@ static void _domain_destroy(struct domain *d) =20 XVFREE(d->console); =20 + domain_free_pending_scrub(d); + argo_destroy(d); =20 rangeset_domain_destroy(d); @@ -1286,6 +1305,8 @@ int domain_kill(struct domain *d) rspin_barrier(&d->domain_lock); argo_destroy(d); vnuma_destroy(d->vnuma); + domain_free_pending_scrub(d); + rspin_unlock(&d->page_alloc_lock); domain_set_outstanding_pages(d, 0); /* fallthrough */ case DOMDYING_dying: @@ -1678,6 +1699,15 @@ int domain_unpause_by_systemcontroller(struct domain= *d) */ if ( new =3D=3D 0 && !d->creation_finished ) { + if ( d->pending_scrub ) + { + printk(XENLOG_ERR + "%pd: cannot be started with pending unscrubbed pages, = destroying\n", + d); + domain_crash(d); + domain_free_pending_scrub(d); + return -EBUSY; + } d->creation_finished =3D true; arch_domain_creation_finished(d); } diff --git a/xen/common/memory.c b/xen/common/memory.c index 10becf7c1f4c..1c48e99a6ab2 100644 --- a/xen/common/memory.c +++ b/xen/common/memory.c @@ -159,6 +159,70 @@ static void increase_reservation(struct memop_args *a) a->nr_done =3D i; } =20 +/* + * Temporary storage for a domain assigned page that's not been fully scru= bbed. + * Stored pages must be domheap ones. + * + * The stashed page can be freed at any time by Xen, the caller must pass = the + * order and NUMA node requirement to the fetch function to ensure the + * currently stashed page matches it's requirements. + */ +static void stash_allocation(struct domain *d, struct page_info *page, + unsigned int order, unsigned int scrub_index) +{ + rspin_lock(&d->page_alloc_lock); + + /* + * Drop the passed page in preference for the already stashed one. Th= is + * interface is designed to be used for single-threaded domain creatio= n. + */ + if ( d->pending_scrub ) + free_domheap_pages(page, order); + else + { + d->pending_scrub_index =3D scrub_index; + d->pending_scrub_order =3D order; + d->pending_scrub =3D page; + } + + rspin_unlock(&d->page_alloc_lock); +} + +static struct page_info *get_stashed_allocation(struct domain *d, + unsigned int order, + nodeid_t node, + unsigned int *scrub_index) +{ + struct page_info *page =3D NULL; + + rspin_lock(&d->page_alloc_lock); + + /* + * If there's a pending page to scrub check if it satisfies the current + * request. If it doesn't free it and return NULL. + */ + if ( d->pending_scrub && d->pending_scrub_order =3D=3D order && + (node =3D=3D NUMA_NO_NODE || node =3D=3D page_to_nid(d->pending_s= crub)) ) + { + page =3D d->pending_scrub; + *scrub_index =3D d->pending_scrub_index; + } + else + free_domheap_pages(d->pending_scrub, d->pending_scrub_order); + + /* + * The caller now owns the page or it has been freed, clear stashed + * information. Prevent concurrent usages of get_stashed_allocation() + * from returning the same page to different contexts. + */ + d->pending_scrub_index =3D 0; + d->pending_scrub_order =3D 0; + d->pending_scrub =3D NULL; + + rspin_unlock(&d->page_alloc_lock); + return page; +} + static void populate_physmap(struct memop_args *a) { struct page_info *page; @@ -275,7 +339,18 @@ static void populate_physmap(struct memop_args *a) } else { - page =3D alloc_domheap_pages(d, a->extent_order, a->memfla= gs); + unsigned int scrub_start =3D 0; + nodeid_t node =3D + (a->memflags & MEMF_exact_node) ? MEMF_get_node(a->mem= flags) + : NUMA_NO_NODE; + + page =3D get_stashed_allocation(d, a->extent_order, node, + &scrub_start); + + if ( !page ) + page =3D alloc_domheap_pages(d, a->extent_order, + a->memflags | (d->creation_finished ? 0 + : MEMF_no_scru= b)); =20 if ( unlikely(!page) ) { @@ -286,6 +361,30 @@ static void populate_physmap(struct memop_args *a) goto out; } =20 + if ( !d->creation_finished ) + { + unsigned int dirty_cnt =3D 0; + + /* Check if there's anything to scrub. */ + for ( j =3D scrub_start; j < (1U << a->extent_order); = j++ ) + { + if ( !test_and_clear_bit(_PGC_need_scrub, + &page[j].count_info) ) + continue; + + scrub_one_page(&page[j], true); + + if ( (j + 1) !=3D (1U << a->extent_order) && + !(++dirty_cnt & 0xff) && + hypercall_preempt_check() ) + { + a->preempted =3D 1; + stash_allocation(d, page, a->extent_order, ++j= ); + goto out; + } + } + } + if ( unlikely(a->memflags & MEMF_no_tlbflush) ) { for ( j =3D 0; j < (1U << a->extent_order); j++ ) diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index de1480316f05..c9e82fd7ab62 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -792,7 +792,7 @@ static void page_list_add_scrub(struct page_info *pg, u= nsigned int node, # define scrub_page_cold clear_page_cold #endif =20 -static void scrub_one_page(const struct page_info *pg, bool cold) +void scrub_one_page(const struct page_info *pg, bool cold) { void *ptr; =20 diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h index 426362adb2f4..d80bfba6d393 100644 --- a/xen/include/xen/mm.h +++ b/xen/include/xen/mm.h @@ -145,6 +145,16 @@ unsigned long avail_node_heap_pages(unsigned int nodei= d); #define alloc_domheap_page(d,f) (alloc_domheap_pages(d,0,f)) #define free_domheap_page(p) (free_domheap_pages(p,0)) =20 +/* Free an allocation, and zero the pointer to it. */ +#define FREE_DOMHEAP_PAGES(p, o) do { \ + void *_ptr_ =3D (p); \ + (p) =3D NULL; \ + free_domheap_pages(_ptr_, o); \ +} while ( false ) +#define FREE_DOMHEAP_PAGE(p) FREE_DOMHEAP_PAGES(p, 0) + +void scrub_one_page(const struct page_info *pg, bool cold); + int online_page(mfn_t mfn, uint32_t *status); int offline_page(mfn_t mfn, int broken, uint32_t *status); int query_page_offline(mfn_t mfn, uint32_t *status); diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 91d6a49daf16..735d5b76b411 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -661,6 +661,11 @@ struct domain =20 /* Pointer to console settings; 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Reduce the limit for in-place scrubbed allocations to a newly introduced define: CONFIG_DIRTY_MAX_ORDER. This currently defaults to CONFIG_PTDOM_MAX_ORDER on all architectures. Also introduce a command line option to set the value. Fixes: 74d2e11ccfd2 ("mm: Scrub pages in alloc_heap_pages() if needed") Signed-off-by: Roger Pau Monn=C3=A9 --- Changes since v3: - Note the order limitation is only post-boot. Changes since v2: - Move placement of the max-order-dirty option help. - Add note in memop-max-order about interactions. - Use CONFIG_PTDOM_MAX_ORDER as the default. Changes since v1: - Split from previous patch. - Introduce a command line option to set the limit. --- docs/misc/xen-command-line.pandoc | 13 +++++++++++++ xen/common/memory.c | 3 --- xen/common/page_alloc.c | 23 ++++++++++++++++++++++- xen/include/xen/mm.h | 4 ++++ 4 files changed, 39 insertions(+), 4 deletions(-) diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line= .pandoc index 15f7a315a4b5..3577e491e379 100644 --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -1837,6 +1837,16 @@ presented as the number of bits needed to encode it.= This must be at least one pending bit to be allocated. Defaults to 20 bits (to cover at most 1048576 interrupts). =20 +### max-order-dirty +> `=3D ` + +Specify the maximum allocation order allowed when scrubbing allocated pages +in-place. The allocation is non-preemptive, and hence the value must be k= eep +low enough to avoid hogging the CPU for too long. + +Defaults to `CONFIG_DIRTY_MAX_ORDER` or if unset to `CONFIG_PTDOM_MAX_ORDE= R`. +Note those are internal per-architecture defines not available from Kconfi= g. + ### mce (x86) > `=3D ` =20 @@ -1878,6 +1888,9 @@ requests issued by the various kinds of domains (in t= his order: ordinary DomU, control domain, hardware domain, and - when supported by the platform - DomU with pass-through device assigned). =20 +Note orders here can be further limited by the value in `max-order-dirty` = for +allocations requesting pages to be scrubbed in-place. + ### mmcfg (x86) > `=3D [,amd-fam10]` =20 diff --git a/xen/common/memory.c b/xen/common/memory.c index 1c48e99a6ab2..a840bab87b34 100644 --- a/xen/common/memory.c +++ b/xen/common/memory.c @@ -56,9 +56,6 @@ struct memop_args { #ifndef CONFIG_CTLDOM_MAX_ORDER #define CONFIG_CTLDOM_MAX_ORDER CONFIG_PAGEALLOC_MAX_ORDER #endif -#ifndef CONFIG_PTDOM_MAX_ORDER -#define CONFIG_PTDOM_MAX_ORDER CONFIG_HWDOM_MAX_ORDER -#endif =20 static unsigned int __read_mostly domu_max_order =3D CONFIG_DOMU_MAX_ORDER; static unsigned int __read_mostly ctldom_max_order =3D CONFIG_CTLDOM_MAX_O= RDER; diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index c9e82fd7ab62..fd6cf92daf51 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -267,6 +267,13 @@ static PAGE_LIST_HEAD(page_offlined_list); /* Broken page list, protected by heap_lock. */ static PAGE_LIST_HEAD(page_broken_list); =20 +/* Maximum order allowed for post-boot allocations with MEMF_no_scrub. */ +#ifndef CONFIG_DIRTY_MAX_ORDER +# define CONFIG_DIRTY_MAX_ORDER CONFIG_PTDOM_MAX_ORDER +#endif +static unsigned int __ro_after_init dirty_max_order =3D CONFIG_DIRTY_MAX_O= RDER; +integer_param("max-order-dirty", dirty_max_order); + /************************* * BOOT-TIME ALLOCATOR */ @@ -1008,7 +1015,13 @@ static struct page_info *alloc_heap_pages( =20 pg =3D get_free_buddy(zone_lo, zone_hi, order, memflags, d); /* Try getting a dirty buddy if we couldn't get a clean one. */ - if ( !pg && !(memflags & MEMF_no_scrub) ) + if ( !pg && !(memflags & MEMF_no_scrub) && + /* + * Allow any order unscrubbed allocations during boot time, we + * compensate by processing softirqs in the scrubbing loop below = once + * irqs are enabled. + */ + (order <=3D dirty_max_order || system_state < SYS_STATE_active) ) pg =3D get_free_buddy(zone_lo, zone_hi, order, memflags | MEMF_no_scrub, d); if ( !pg ) @@ -1117,6 +1130,14 @@ static struct page_info *alloc_heap_pages( scrub_one_page(&pg[i], cold); =20 dirty_cnt++; + + /* + * Use SYS_STATE_smp_boot explicitly; ahead of that state + * interrupts are disabled. + */ + if ( system_state =3D=3D SYS_STATE_smp_boot && + !(dirty_cnt & 0xff) ) + process_pending_softirqs(); } else check_one_page(&pg[i]); diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h index d80bfba6d393..cf3796d4286d 100644 --- a/xen/include/xen/mm.h +++ b/xen/include/xen/mm.h @@ -232,6 +232,10 @@ struct npfec { #else #define MAX_ORDER 20 /* 2^20 contiguous pages */ #endif +#ifndef CONFIG_PTDOM_MAX_ORDER +# define CONFIG_PTDOM_MAX_ORDER CONFIG_HWDOM_MAX_ORDER +#endif + mfn_t acquire_reserved_page(struct domain *d, unsigned int memflags); =20 /* Private domain structs for DOMID_XEN, DOMID_IO, etc. */ --=20 2.51.0