From nobody Tue Feb 10 03:40:25 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=fail(p=none dis=none) header.from=arm.com Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1654587228133854.3975904081532; Tue, 7 Jun 2022 00:33:48 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.342932.568070 (Exim 4.92) (envelope-from ) id 1nyTiR-0007Z6-Jq; Tue, 07 Jun 2022 07:33:27 +0000 Received: by outflank-mailman (output) from mailman id 342932.568070; Tue, 07 Jun 2022 07:33:27 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nyTiR-0007Yz-G0; Tue, 07 Jun 2022 07:33:27 +0000 Received: by outflank-mailman (input) for mailman id 342932; Tue, 07 Jun 2022 07:33:26 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nyTgN-0003fm-7S for xen-devel@lists.xenproject.org; Tue, 07 Jun 2022 07:31:19 +0000 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by se1-gles-sth1.inumbo.com (Halon) with ESMTP id d1c68291-e633-11ec-bd2c-47488cf2e6aa; Tue, 07 Jun 2022 09:31:18 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9A2BA1480; Tue, 7 Jun 2022 00:31:17 -0700 (PDT) Received: from a011292.shanghai.arm.com (a011292.shanghai.arm.com [10.169.190.94]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id D68233F66F; Tue, 7 Jun 2022 00:31:13 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: d1c68291-e633-11ec-bd2c-47488cf2e6aa From: Penny Zheng To: xen-devel@lists.xenproject.org Cc: wei.chen@arm.com, Penny Zheng , Stefano Stabellini , Julien Grall , Bertrand Marquis , Volodymyr Babchuk , Andrew Cooper , George Dunlap , Jan Beulich , Wei Liu , Penny Zheng Subject: [PATCH v6 7/9] xen/arm: unpopulate memory when domain is static Date: Tue, 7 Jun 2022 15:30:29 +0800 Message-Id: <20220607073031.722174-8-Penny.Zheng@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220607073031.722174-1-Penny.Zheng@arm.com> References: <20220607073031.722174-1-Penny.Zheng@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1654587228843100003 Content-Type: text/plain; charset="utf-8" Today when a domain unpopulates the memory on runtime, they will always hand the memory back to the heap allocator. And it will be a problem if dom= ain is static. Pages as guest RAM for static domain shall be reserved to only this domain and not be used for any other purposes, so they shall never go back to heap allocator. This commit puts reserved pages on the new list resv_page_list only after having taken them off the "normal" list, when the last ref dropped. Signed-off-by: Penny Zheng Acked-by: Jan Beulich --- v6 changes: - refine in-code comment - move PGC_static !CONFIG_STATIC_MEMORY definition to common header --- v5 changes: - adapt this patch for PGC_staticmem --- v4 changes: - no changes --- v3 changes: - have page_list_del() just once out of the if() - remove resv_pages counter - make arch_free_heap_page be an expression, not a compound statement. --- v2 changes: - put reserved pages on resv_page_list after having taken them off the "normal" list --- xen/arch/arm/include/asm/mm.h | 12 ++++++++++++ xen/common/domain.c | 4 ++++ xen/common/page_alloc.c | 4 ---- xen/include/xen/mm.h | 4 ++++ xen/include/xen/sched.h | 3 +++ 5 files changed, 23 insertions(+), 4 deletions(-) diff --git a/xen/arch/arm/include/asm/mm.h b/xen/arch/arm/include/asm/mm.h index 7442893e77..2ce4d80796 100644 --- a/xen/arch/arm/include/asm/mm.h +++ b/xen/arch/arm/include/asm/mm.h @@ -360,6 +360,18 @@ void clear_and_clean_page(struct page_info *page); =20 unsigned int arch_get_dma_bitsize(void); =20 +/* + * Put free pages on the resv page list after having taken them + * off the "normal" page list, when pages from static memory + */ +#ifdef CONFIG_STATIC_MEMORY +#define arch_free_heap_page(d, pg) ({ \ + page_list_del(pg, page_to_list(d, pg)); \ + if ( (pg)->count_info & PGC_static ) \ + page_list_add_tail(pg, &(d)->resv_page_list); \ +}) +#endif + #endif /* __ARCH_ARM_MM__ */ /* * Local variables: diff --git a/xen/common/domain.c b/xen/common/domain.c index a3ef991bd1..a49574fa24 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -604,6 +604,10 @@ struct domain *domain_create(domid_t domid, INIT_PAGE_LIST_HEAD(&d->page_list); INIT_PAGE_LIST_HEAD(&d->extra_page_list); INIT_PAGE_LIST_HEAD(&d->xenpage_list); +#ifdef CONFIG_STATIC_MEMORY + INIT_PAGE_LIST_HEAD(&d->resv_page_list); +#endif + =20 spin_lock_init(&d->node_affinity_lock); d->node_affinity =3D NODE_MASK_ALL; diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index 7fb28e2e07..886b5d82a2 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -151,10 +151,6 @@ #define p2m_pod_offline_or_broken_replace(pg) BUG_ON(pg !=3D NULL) #endif =20 -#ifndef PGC_static -#define PGC_static 0 -#endif - /* * Comma-separated list of hexadecimal page numbers containing bad bytes. * e.g. 'badpage=3D0x3f45,0x8a321'. diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h index 1c4ddb336b..e80b4bdcde 100644 --- a/xen/include/xen/mm.h +++ b/xen/include/xen/mm.h @@ -210,6 +210,10 @@ extern struct domain *dom_cow; =20 #include =20 +#ifndef PGC_static +#define PGC_static 0 +#endif + static inline bool is_special_page(const struct page_info *page) { return is_xen_heap_page(page) || (page->count_info & PGC_extra); diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 5191853c18..bd2782b3c5 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -381,6 +381,9 @@ struct domain struct page_list_head page_list; /* linked list */ struct page_list_head extra_page_list; /* linked list (size extra_page= s) */ struct page_list_head xenpage_list; /* linked list (size xenheap_pages= ) */ +#ifdef CONFIG_STATIC_MEMORY + struct page_list_head resv_page_list; /* linked list */ +#endif =20 /* * This field should only be directly accessed by domain_adjust_tot_pa= ges() --=20 2.25.1