From nobody Fri Nov 29 00:55:40 2024 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; dkim=pass; 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=pass(p=none dis=none) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; t=1652476078; cv=none; d=zohomail.com; s=zohoarc; b=U7sIX+y8dVinU/5WBGcbcDJtxaeV+PGLzsfrimkupnBTs9uAzfQYoQrCnOpUIj8WGa4Vrn1ZGCRVRnUvhLb/OPTe4nPDT8WSfaKE9AdsMdfw5gJeBdOTJqL+YsQu5EXchSsiVZbQm0V1T2OupZ2Vnlz4sniTvzMSYM5JlRCGBnQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1652476078; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=gc5lvlMtbs/oFAC2I7x1KUoeZdOD9Xkqtp6xF/i6pLo=; b=n7wRjFdahaIAkgU3qMaZXzXZpFZkSc55bAMHzvrQgZNoMrBuV7BmD1MXAi9i/DP5DrIxgBNCG5kCDww4TW5jTi1YI37oh1o4qW0TYZg+2NnT9MZM2gHNSmboKCbafWLZXghvAZySw9RFozUYZgcn50VJuHgUnM4FmSNPk8ZyzPg= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; 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=pass header.from= (p=none dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1652476078171150.42002743048283; Fri, 13 May 2022 14:07:58 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.328776.551909 (Exim 4.92) (envelope-from ) id 1npcVc-0004XF-B1; Fri, 13 May 2022 21:07:36 +0000 Received: by outflank-mailman (output) from mailman id 328776.551909; Fri, 13 May 2022 21:07:36 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1npcVc-0004X8-6z; Fri, 13 May 2022 21:07:36 +0000 Received: by outflank-mailman (input) for mailman id 328776; Fri, 13 May 2022 21:07:35 +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 1npcVb-0004Ds-72 for xen-devel@lists.xenproject.org; Fri, 13 May 2022 21:07:35 +0000 Received: from ams.source.kernel.org (ams.source.kernel.org [2604:1380:4601:e00::1]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id b5b83506-d300-11ec-aa76-f101dd46aeb6; Fri, 13 May 2022 23:07:34 +0200 (CEST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 04C47B83132; Fri, 13 May 2022 21:07:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5388DC34100; Fri, 13 May 2022 21:07:32 +0000 (UTC) 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: b5b83506-d300-11ec-aa76-f101dd46aeb6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652476052; bh=xMPekEl/+TKjYbBcl6Wf3vqDYVIUg969PFQ3M8T2yk4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C+NhbuYsko/M1WS+4kF+1ImUVlPXAWyNnN6ApEm3pObIcqlTy6k26mfMW2mCd+2rW rBAPK1rmJVWyjlNl93KtRk7tP0aPkD5DYBZ7wt4oOhjQtHmK8ZjD/JzO7hw5uCMV3l 2B2KEdqo5qvCDp8MkJ19Pq3RcqOzmeyzVs5LeMTufojBeZNkCZEiXTVCyzQ1xQ/OHP SxLGP4nH3RI5QM5OFUkmFTNlS8tDwGOaUd2EyO3oLBCLOJKA4G2snjsvoEL4YruDzy Gs+vZKAf+UdsSH6WXGcsfeIFRutVq87DU3roSxZkgZx4FSxNtiYGVYAVOYPLekhzQw O0yy1IiYQ5DsA== From: Stefano Stabellini To: xen-devel@lists.xenproject.org Cc: sstabellini@kernel.org, jgross@suse.com, Bertrand.Marquis@arm.com, julien@xen.org, Volodymyr_Babchuk@epam.com, Stefano Stabellini , Bertrand Marquis , Luca Fancellu Subject: [PATCH v7 1/7] xen/dt: of_property_read_string return -ENODATA when !length Date: Fri, 13 May 2022 14:07:24 -0700 Message-Id: <20220513210730.679871-1-sstabellini@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1652476079743100003 Content-Type: text/plain; charset="utf-8" From: Stefano Stabellini When the length of the string is zero of_property_read_string should return -ENODATA according to the description of the function. However, of_property_read_string doesn't check prop->length. If prop->length is zero, return -ENODATA. Without this patch the following command in u-boot: fdt set /chosen/node property-name results in of_property_read_string returning -EILSEQ when attempting to read property-name. With this patch, it returns -ENODATA as expected. This commit is a backport of: https://lore.kernel.org/xen-devel/20220416003028.1315268-1-sstabellini@kern= el.org/ Signed-off-by: Stefano Stabellini Reviewed-by: Bertrand Marquis Reviewed-by: Luca Fancellu --- Changes in v5: - backport from Linux --- xen/common/device_tree.c | 2 +- xen/include/xen/device_tree.h | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) --- xen/common/device_tree.c | 2 +- xen/include/xen/device_tree.h | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c index 4aae281e89..0e8798bd24 100644 --- a/xen/common/device_tree.c +++ b/xen/common/device_tree.c @@ -198,7 +198,7 @@ int dt_property_read_string(const struct dt_device_node= *np, =20 if ( !pp ) return -EINVAL; - if ( !pp->value ) + if ( !pp->length ) return -ENODATA; if ( strnlen(pp->value, pp->length) >=3D pp->length ) return -EILSEQ; diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h index fd6cd00b43..430a1ef445 100644 --- a/xen/include/xen/device_tree.h +++ b/xen/include/xen/device_tree.h @@ -451,6 +451,9 @@ static inline bool_t dt_property_read_bool(const struct= dt_device_node *np, * doest not have value, and -EILSEQ if the string is not * null-terminated with the length of the property data. * + * Note that the empty string "" has length of 1, thus -ENODATA cannot + * be interpreted as an empty string. + * * The out_string pointer is modified only if a valid string can be decode= d. */ int dt_property_read_string(const struct dt_device_node *np, --=20 2.25.1 From nobody Fri Nov 29 00:55:40 2024 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; 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c=relaxed/simple; d=kernel.org; s=k20201202; t=1652476053; bh=GuU6qA8FErbNr89RInOmtwTYqYZQ6Wfj7rcBSkqDOLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=joTOzbHXgitRICE7cgCv5LKuhQy8XgxEVzOzpgQByljObJ7UL1PrxkQ1d/GGmJZM3 UuuxhP4TbQa7cR9D+DwzVqd6X+F7GYDXH4CZs/CQFVHpMuVKSfKvMAplr828YgrKPt YSa8DIrV9WiqWPQBcs3R6KAaRp/wvjq1JJjnfwBDFsNj3KjUW1gVny9+Tyn/xG/2s2 t2X0Tn9kIvu3+L9ORb5o0466zbq1DPis+OwjKfm3ish36YGd+O9FbY47Mzu3mScV1g LoS+mS8DfKQvPdzMOdsZ3DDi2WchhQ8q231PMpccAEB4n7PwOFKA3V/e3n/sRhod/l eLJzOfUTyNzIw== From: Stefano Stabellini To: xen-devel@lists.xenproject.org Cc: sstabellini@kernel.org, jgross@suse.com, Bertrand.Marquis@arm.com, julien@xen.org, Volodymyr_Babchuk@epam.com, Stefano Stabellini , Luca Fancellu , Oleksandr Tyshchenko , Julien Grall Subject: [PATCH v7 2/7] xen/arm: implement domU extended regions Date: Fri, 13 May 2022 14:07:25 -0700 Message-Id: <20220513210730.679871-2-sstabellini@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1652476083868100002 Content-Type: text/plain; charset="utf-8" From: Stefano Stabellini Implement extended regions for dom0less domUs. The implementation is based on the libxl implementation. Also update docs for the ext_regions command line option. Signed-off-by: Stefano Stabellini Reviewed-by: Luca Fancellu Reviewed-by: Oleksandr Tyshchenko Acked-by: Julien Grall --- Changes in v6: - add reviewed-by - address 2 NITs - update docs Changes in v5: - print the domain - coding style - simplify the code in find_domU_holes - return error if no regions allocated in find_domU_holes - use ROUNDUP - uint64_t/paddr_t --- docs/misc/xen-command-line.pandoc | 9 ++--- xen/arch/arm/domain_build.c | 60 ++++++++++++++++++++++++++----- 2 files changed, 56 insertions(+), 13 deletions(-) --- docs/misc/xen-command-line.pandoc | 9 ++--- xen/arch/arm/domain_build.c | 60 ++++++++++++++++++++++++++----- 2 files changed, 56 insertions(+), 13 deletions(-) diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line= .pandoc index 1dc7e1ca07..881fe409ac 100644 --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -1110,11 +1110,12 @@ to use the default. =20 > Default : `true` =20 -Flag to enable or disable support for extended regions for Dom0. +Flag to enable or disable support for extended regions for Dom0 and +Dom0less DomUs. =20 -Extended regions are ranges of unused address space exposed to Dom0 as -"safe to use" for special memory mappings. Disable if your board device -tree is incomplete. +Extended regions are ranges of unused address space exposed to the guest +as "safe to use" for special memory mappings. Disable if your board +device tree is incomplete. =20 ### flask > `=3D permissive | enforcing | late | disabled` diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index aa777741bd..c4dd211b91 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -35,7 +35,10 @@ static unsigned int __initdata opt_dom0_max_vcpus; integer_param("dom0_max_vcpus", opt_dom0_max_vcpus); =20 -/* If true, the extended regions support is enabled for dom0 */ +/* + * If true, the extended regions support is enabled for dom0 and + * dom0less domUs. + */ static bool __initdata opt_ext_regions =3D true; boolean_param("ext_regions", opt_ext_regions); =20 @@ -1327,6 +1330,36 @@ out: return res; } =20 +static int __init find_domU_holes(const struct kernel_info *kinfo, + struct meminfo *ext_regions) +{ + unsigned int i; + paddr_t bankend; + const paddr_t bankbase[] =3D GUEST_RAM_BANK_BASES; + const paddr_t banksize[] =3D GUEST_RAM_BANK_SIZES; + int res =3D -ENOENT; + + for ( i =3D 0; i < GUEST_RAM_BANKS; i++ ) + { + struct membank *ext_bank =3D &(ext_regions->bank[ext_regions->nr_b= anks]); + + ext_bank->start =3D ROUNDUP(bankbase[i] + kinfo->mem.bank[i].size,= SZ_2M); + + bankend =3D ~0ULL >> (64 - p2m_ipa_bits); + bankend =3D min(bankend, bankbase[i] + banksize[i] - 1); + if ( bankend > ext_bank->start ) + ext_bank->size =3D bankend - ext_bank->start + 1; + + /* 64MB is the minimum size of an extended region */ + if ( ext_bank->size < MB(64) ) + continue; + ext_regions->nr_banks++; + res =3D 0; + } + + return res; +} + static int __init make_hypervisor_node(struct domain *d, const struct kernel_info *kinfo, int addrcells, int sizecells) @@ -1363,12 +1396,13 @@ static int __init make_hypervisor_node(struct domai= n *d, =20 if ( !opt_ext_regions ) { - printk(XENLOG_INFO "The extended regions support is disabled\n"); + printk(XENLOG_INFO "%pd: extended regions support is disabled\n", = d); nr_ext_regions =3D 0; } else if ( is_32bit_domain(d) ) { - printk(XENLOG_WARNING "The extended regions are only supported for= 64-bit guest currently\n"); + printk(XENLOG_WARNING + "%pd: extended regions not supported for 32-bit guests\n", = d); nr_ext_regions =3D 0; } else @@ -1377,13 +1411,21 @@ static int __init make_hypervisor_node(struct domai= n *d, if ( !ext_regions ) return -ENOMEM; =20 - if ( !is_iommu_enabled(d) ) - res =3D find_unallocated_memory(kinfo, ext_regions); + if ( is_domain_direct_mapped(d) ) + { + if ( !is_iommu_enabled(d) ) + res =3D find_unallocated_memory(kinfo, ext_regions); + else + res =3D find_memory_holes(kinfo, ext_regions); + } else - res =3D find_memory_holes(kinfo, ext_regions); + { + res =3D find_domU_holes(kinfo, ext_regions); + } =20 if ( res ) - printk(XENLOG_WARNING "Failed to allocate extended regions\n"); + printk(XENLOG_WARNING "%pd: failed to allocate extended region= s\n", + d); nr_ext_regions =3D ext_regions->nr_banks; } =20 @@ -1404,8 +1446,8 @@ static int __init make_hypervisor_node(struct domain = *d, u64 start =3D ext_regions->bank[i].start; u64 size =3D ext_regions->bank[i].size; =20 - printk("Extended region %d: %#"PRIx64"->%#"PRIx64"\n", - i, start, start + size); 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Fri, 13 May 2022 21:07:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 89E1FC34118; Fri, 13 May 2022 21:07:33 +0000 (UTC) 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: b65a4bf4-d300-11ec-aa76-f101dd46aeb6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652476053; bh=sl1hbeFkH4WN0bbZ/wxmpn+D3pl0OgZL21wS4PaGxQc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q9cPPBtkA/LZhGum/x+AFW+4w3kU9mgs3jshltQa37DYHjVAxTXUuUuZyMpPKVj1z HlqnquIiYyhTOTqjW9rZLoJMsxqOMfxpI1DOoeLORnxLIimFRBLYLYYsNLOc4VVdI2 V4J44zFV3nn52rzXUCsKapO8VfC/Yrbh6b36mYZMnamPOLQZV2S5E99Jxk6mccx9HW pdH0w0GDczTfGemutZzgrZwW7k6kOHqmvyPkpY2zbrrkc75ACOmTx+1sTwBmhvEOZx EQEzAKDJR0CJmWV1RZGFboOxKbV9s1ebNssmTkD90CQXVVeTDMqSYjKlgeVrb3+ydm EEs22t5JoWeVw== From: Stefano Stabellini To: xen-devel@lists.xenproject.org Cc: sstabellini@kernel.org, jgross@suse.com, Bertrand.Marquis@arm.com, julien@xen.org, Volodymyr_Babchuk@epam.com, Stefano Stabellini , Bertrand Marquis Subject: [PATCH v7 3/7] xen: introduce xen,enhanced dom0less property Date: Fri, 13 May 2022 14:07:26 -0700 Message-Id: <20220513210730.679871-3-sstabellini@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1652476083862100001 Content-Type: text/plain; charset="utf-8" From: Stefano Stabellini Introduce a new "xen,enhanced" dom0less property to enable/disable PV driver interfaces for dom0less guests. Currently only "enabled" and "disabled" are supported property values (and empty). Leave the option open to implement further possible values in the future (e.g. "xenstore" to enable only xenstore.) Dom0 presence is required for now to use "xen,enhanced" on a domU. The configurable option is for domUs only. For dom0 we always set the corresponding property in the Xen code to true (PV interfaces enabled.) This patch only parses the property. Next patches will make use of it. Signed-off-by: Stefano Stabellini CC: Julien Grall CC: Volodymyr Babchuk CC: Bertrand Marquis Acked-by: Julien Grall --- Changes in v7: - add a check if dom0 is missing and xen,enhanced was specified - Bertrand gave his reviewed-by but I removed it due to the new check Changes in v4: - move xen,enhanced to the bottom of the list - do not set kinfo.dom0less_enhanced for dom0 Changes in v3: - improve commit message Changes in v2: - rename kinfo.enhanced to kinfo.dom0less_enhanced - set kinfo.dom0less_enhanced to true for dom0 - handle -ENODATA in addition to -EILSEQ --- docs/misc/arm/device-tree/booting.txt | 18 ++++++++++++++++++ xen/arch/arm/domain_build.c | 7 +++++++ xen/arch/arm/include/asm/kernel.h | 3 +++ 3 files changed, 28 insertions(+) --- docs/misc/arm/device-tree/booting.txt | 18 ++++++++++++++++++ xen/arch/arm/domain_build.c | 12 ++++++++++++ xen/arch/arm/include/asm/kernel.h | 3 +++ 3 files changed, 33 insertions(+) diff --git a/docs/misc/arm/device-tree/booting.txt b/docs/misc/arm/device-t= ree/booting.txt index 7b4a29a2c2..98253414b8 100644 --- a/docs/misc/arm/device-tree/booting.txt +++ b/docs/misc/arm/device-tree/booting.txt @@ -193,6 +193,24 @@ with the following properties: Optional. Handle to a xen,cpupool device tree node that identifies the cpupool where the guest will be started at boot. =20 +- xen,enhanced + + A string property. Possible property values are: + + - "enabled" (or missing property value) + Xen PV interfaces, including grant-table and xenstore, will be + enabled for the VM. + + - "disabled" + Xen PV interfaces are disabled. + + If the xen,enhanced property is present with no value, it defaults + to "enabled". If the xen,enhanced property is not present, PV + interfaces are disabled. + + In the future other possible property values might be added to + enable only selected interfaces. + Under the "xen,domain" compatible node, one or more sub-nodes are present for the DomU kernel and ramdisk. =20 diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index c4dd211b91..8d148b209d 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -3157,6 +3157,7 @@ static int __init construct_domU(struct domain *d, const struct dt_device_node *node) { struct kernel_info kinfo =3D {}; + const char *dom0less_enhanced; int rc; u64 mem; =20 @@ -3172,6 +3173,17 @@ static int __init construct_domU(struct domain *d, =20 kinfo.vpl011 =3D dt_property_read_bool(node, "vpl011"); =20 + rc =3D dt_property_read_string(node, "xen,enhanced", &dom0less_enhance= d); + if ( rc =3D=3D -EILSEQ || + rc =3D=3D -ENODATA || + (rc =3D=3D 0 && !strcmp(dom0less_enhanced, "enabled")) ) + { + if ( hardware_domain ) + kinfo.dom0less_enhanced =3D true; + else + printk("Error: tried to use xen,enhanced without dom0\n"); + } + if ( vcpu_create(d, 0) =3D=3D NULL ) return -ENOMEM; =20 diff --git a/xen/arch/arm/include/asm/kernel.h b/xen/arch/arm/include/asm/k= ernel.h index 874aa108a7..c4dc039b54 100644 --- a/xen/arch/arm/include/asm/kernel.h +++ b/xen/arch/arm/include/asm/kernel.h @@ -36,6 +36,9 @@ struct kernel_info { /* Enable pl011 emulation */ bool vpl011; =20 + /* Enable PV drivers */ + bool dom0less_enhanced; + /* GIC phandle */ uint32_t phandle_gic; =20 --=20 2.25.1 From nobody Fri Nov 29 00:55:40 2024 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; dkim=pass; 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; 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charset="utf-8" From: Luca Miccio Export evtchn_alloc_unbound and make it __must_check. If "xen,enhanced" is enabled, then add to dom0less domains: - the hypervisor node in device tree - the xenstore event channel The xenstore event channel is also used for the first notification to let the guest know that xenstore has become available. Signed-off-by: Luca Miccio Signed-off-by: Stefano Stabellini Reviewed-by: Bertrand Marquis Acked-by: Jan Beulich CC: Julien Grall CC: Volodymyr Babchuk CC: Bertrand Marquis --- Changes in v7: - add an ASSERT, hardware_domain is required Changes in v5: - merge with "xen: export evtchn_alloc_unbound" - __must_check Changes in v3: - use evtchn_alloc_unbound Changes in v2: - set HVM_PARAM_STORE_PFN to ~0ULL at domain creation - in alloc_xenstore_evtchn do not call _evtchn_alloc_unbound xen: export evtchn_alloc_unbound It will be used during dom0less domains construction. --- xen/arch/arm/domain_build.c | 37 +++++++++++++++++++++++++++++++++++++ xen/common/event_channel.c | 2 +- xen/include/xen/event.h | 3 +++ 3 files changed, 41 insertions(+), 1 deletion(-) --- xen/arch/arm/domain_build.c | 38 +++++++++++++++++++++++++++++++++++++ xen/common/event_channel.c | 2 +- xen/include/xen/event.h | 3 +++ 3 files changed, 42 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index 8d148b209d..27b2c7ec3f 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -27,6 +27,7 @@ #include #include #include +#include =20 #include #include @@ -2813,6 +2814,8 @@ static int __init prepare_dtb_domU(struct domain *d, = struct kernel_info *kinfo) int ret; =20 kinfo->phandle_gic =3D GUEST_PHANDLE_GIC; + kinfo->gnttab_start =3D GUEST_GNTTAB_BASE; + kinfo->gnttab_size =3D GUEST_GNTTAB_SIZE; =20 addrcells =3D GUEST_ROOT_ADDRESS_CELLS; sizecells =3D GUEST_ROOT_SIZE_CELLS; @@ -2887,6 +2890,13 @@ static int __init prepare_dtb_domU(struct domain *d,= struct kernel_info *kinfo) goto err; } =20 + if ( kinfo->dom0less_enhanced ) + { + ret =3D make_hypervisor_node(d, kinfo, addrcells, sizecells); + if ( ret ) + goto err; + } + ret =3D fdt_end_node(kinfo->fdt); if ( ret < 0 ) goto err; @@ -3153,6 +3163,25 @@ static int __init construct_domain(struct domain *d,= struct kernel_info *kinfo) return 0; } =20 +static int __init alloc_xenstore_evtchn(struct domain *d) +{ + evtchn_alloc_unbound_t alloc; + int rc; + + alloc.dom =3D d->domain_id; + alloc.remote_dom =3D hardware_domain->domain_id; + rc =3D evtchn_alloc_unbound(&alloc); + if ( rc ) + { + printk("Failed allocating event channel for domain\n"); + return rc; + } + + d->arch.hvm.params[HVM_PARAM_STORE_EVTCHN] =3D alloc.port; + + return 0; +} + static int __init construct_domU(struct domain *d, const struct dt_device_node *node) { @@ -3222,6 +3251,15 @@ static int __init construct_domU(struct domain *d, if ( rc < 0 ) return rc; =20 + if ( kinfo.dom0less_enhanced ) + { + ASSERT(hardware_domain); + rc =3D alloc_xenstore_evtchn(d); + if ( rc < 0 ) + return rc; + d->arch.hvm.params[HVM_PARAM_STORE_PFN] =3D ~0ULL; + } + return rc; } =20 diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c index 0a82eb3ac2..e60cd98d75 100644 --- a/xen/common/event_channel.c +++ b/xen/common/event_channel.c @@ -290,7 +290,7 @@ void evtchn_free(struct domain *d, struct evtchn *chn) xsm_evtchn_close_post(chn); } =20 -static int evtchn_alloc_unbound(evtchn_alloc_unbound_t *alloc) +int evtchn_alloc_unbound(evtchn_alloc_unbound_t *alloc) { struct evtchn *chn; struct domain *d; diff --git a/xen/include/xen/event.h b/xen/include/xen/event.h index 21c95e14fd..f3021fe304 100644 --- a/xen/include/xen/event.h +++ b/xen/include/xen/event.h @@ -71,6 +71,9 @@ void evtchn_free(struct domain *d, struct evtchn *chn); 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Fri, 13 May 2022 21:07:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6EB1C34114; Fri, 13 May 2022 21:07:34 +0000 (UTC) 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: b669674b-d300-11ec-b8b8-f95467ff1ed0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652476055; bh=OcQ376zqgJ7yxyRMcJ28nIn26b0HBAsjUw2l6jWzJxs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YWjUTBH6PD5UdqsXQu8y2PqyRNQtQT0CGKFCx9Lu2T0fW+l8hHOLgAZYZ2/wB9L6R SnsuFw7dwGoYSC1Zewtk7ee034pOX+tJaJ1z8A2VTyWrhg6lNEpQrZC+6fpISuHcJq YWfhKo+ezolQ5FeVJux8TT187883OC1oyz/BcCeD5CJiLiTpjSIGXDcvHZL2BbSVsh fSKNmv5DcGHnoV6+OAD1q5EMuThDx4a2RjVLZzKDrhqaMfy7yj3xdL1vX/TALZp9oM x/LMCgo3Ru7D4EXibrwTeCF76rVmUK1fFVSrfWeQ0tKH3CtRnxsVy3b1XoDgK2iQfs zPSuH4X16dMYA== From: Stefano Stabellini To: xen-devel@lists.xenproject.org Cc: sstabellini@kernel.org, jgross@suse.com, Bertrand.Marquis@arm.com, julien@xen.org, Volodymyr_Babchuk@epam.com, Luca Miccio , Stefano Stabellini Subject: [PATCH v7 5/7] xenstored: send an evtchn notification on introduce_domain Date: Fri, 13 May 2022 14:07:28 -0700 Message-Id: <20220513210730.679871-5-sstabellini@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1652476083961100005 Content-Type: text/plain; charset="utf-8" From: Luca Miccio When xs_introduce_domain is called, send out a notification on the xenstore event channel so that any (dom0less) domain waiting for the xenstore interface to be ready can continue with the initialization. Before sending the notification, clear XENSTORE_RECONNECTING. The extra notification is harmless for domains that don't require it. In xs_wire.h update the commment on top of XENSTORE_RECONNECTING to generalize its meaning to suit the dom0less use-case better. Also improve docs/misc/xenstore-ring.txt. Signed-off-by: Luca Miccio Signed-off-by: Stefano Stabellini Reviewed-by: Juergen Gross --- Changes in v7: - add documentation to xenstore-ring.txt - Juergen already gave his reviewed-by, I dropped it due to the change to xenstore-ring.txt, but everything else is still the same Changes in v6: - use XENSTORE_CONNECTED instead of 0x0 - update xs_wire.h Changes in v5: - reset XS_CONNECTION_STATE_RECONNECTING before notifying the domU Changes in v2: - drop the new late_init parameter --- tools/xenstore/xenstored_domain.c | 4 ++++ xen/include/public/io/xs_wire.h | 2 +- 2 files changed, 5 insertions(+), 1 deletion(-) --- docs/misc/xenstore-ring.txt | 8 +++++++- tools/xenstore/xenstored_domain.c | 4 ++++ xen/include/public/io/xs_wire.h | 2 +- 3 files changed, 12 insertions(+), 2 deletions(-) diff --git a/docs/misc/xenstore-ring.txt b/docs/misc/xenstore-ring.txt index b338b21b19..f3d6ca4264 100644 --- a/docs/misc/xenstore-ring.txt +++ b/docs/misc/xenstore-ring.txt @@ -111,7 +111,13 @@ Assuming the server has advertised the feature, the gu= est can initiate a reconnection by setting the the Connection state to 1 ("Ring close and reconnect is in progress") and signalling the event channel. The guest must now ignore all fields except the Connection state and -wait for it to be set to 0 ("Ring is connected") +wait for it to be set to 0 ("Ring is connected"). + +In certain circumstances (e.g. dom0less guests with PV drivers support) +it is possible for the guest to find the Connection state already set to +1 by someone else during xenstore initialization. In that case, like in +the previous case, the guest must ignore all fields except the +Connection state and wait for it to be set to 0 before proceeding. =20 The server will guarantee to =20 diff --git a/tools/xenstore/xenstored_domain.c b/tools/xenstore/xenstored_d= omain.c index 80ba1d627b..de88bf2a68 100644 --- a/tools/xenstore/xenstored_domain.c +++ b/tools/xenstore/xenstored_domain.c @@ -493,6 +493,10 @@ static struct domain *introduce_domain(const void *ctx, /* Now domain belongs to its connection. */ talloc_steal(domain->conn, domain); =20 + /* Notify the domain that xenstore is available */ + interface->connection =3D XENSTORE_CONNECTED; + xenevtchn_notify(xce_handle, domain->port); + if (!is_master_domain && !restore) fire_watches(NULL, ctx, "@introduceDomain", NULL, true, NULL); diff --git a/xen/include/public/io/xs_wire.h b/xen/include/public/io/xs_wir= e.h index 953a0050a3..c1ec7c73e3 100644 --- a/xen/include/public/io/xs_wire.h +++ b/xen/include/public/io/xs_wire.h @@ -141,7 +141,7 @@ struct xenstore_domain_interface { =20 /* Valid values for the connection field */ #define XENSTORE_CONNECTED 0 /* the steady-state */ -#define XENSTORE_RECONNECT 1 /* guest has initiated a reconnect */ +#define XENSTORE_RECONNECT 1 /* reconnect in progress */ =20 /* Valid values for the error field */ #define XENSTORE_ERROR_NONE 0 /* No error */ --=20 2.25.1 From nobody Fri Nov 29 00:55:40 2024 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; 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c=relaxed/simple; d=kernel.org; s=k20201202; t=1652476055; bh=np7FZDzo1soVXzJPDCUCWYC3dzjUNzPqexG/fuvJoXc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=a0F5TVJqdJlvd12iFnhVbUUbrKysjbMl9FP1nRE/mwvz/AZv9JcQaCRCp0KVf9ZWC DxuH9iXE3cvAXhRmpHNLT105CaKypw5CxlvRDWFSGqoFGe/9t4euCPKcStH53zrPM4 Lq5LYXKoMJTR+6dF6CxVSRDK2qVrrtDhriZJjX0yRnW2QFtLC5vXkkRdYVq1zC17Vx F9cl0eXyptQZEsOfgP8STK4Q9gr3O5T1EpIRrF0B0QS073DW0sHD97xE51nMoVxDxg QsnhRzQa/99Xth3UACGaYL5JKOz1zoDcSJS7pyQ1kUEPBw7q3+Q1yMnxFI1WjFcscp GVPTObcyX+haQ== From: Stefano Stabellini To: xen-devel@lists.xenproject.org Cc: sstabellini@kernel.org, jgross@suse.com, Bertrand.Marquis@arm.com, julien@xen.org, Volodymyr_Babchuk@epam.com, Luca Miccio , Stefano Stabellini , Wei Liu , Anthony PERARD Subject: [PATCH v7 6/7] tools: add example application to initialize dom0less PV drivers Date: Fri, 13 May 2022 14:07:29 -0700 Message-Id: <20220513210730.679871-6-sstabellini@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1652476085789100011 Content-Type: text/plain; charset="utf-8" From: Luca Miccio Add an example application that can be run in dom0 to complete the dom0less domains initialization so that they can get access to xenstore and use PV drivers. The application sets "connection" to XENSTORE_RECONNECT on the xenstore page before calling xs_introduce_domain to signal that the connection is not ready yet to be used. XENSTORE_RECONNECT is reset soon after by xenstored. Signed-off-by: Luca Miccio Signed-off-by: Stefano Stabellini CC: Wei Liu CC: Anthony PERARD CC: Juergen Gross Acked-by: Julien Grall --- Changes in v8: - check on HVM_PARAM_STORE_EVTCHN to see if the domain is xen,enhanced - fix ubuntu native build, #include for PROT_* definitions Changes in v7: - use PROT_READ | PROT_WRITE instead XS_READ | XS_WRITE Changes in v6: - include xs_wire.h and use its definitions Changes in v5: - set XS_CONNECTION_STATE_RECONNECTING before xs_introduce_domain Changes in v4: - only alloc xs page (no other magic pages) - add xenstore permissions - check all return values - rename restore_xenstore to create_xenstore - set target_memkb - set start_time properly - close xs transaction on error - call xc_dom_gnttab_seed instead of xc_dom_gnttab_init - xs_open instead of xs_daemon_open Changes in v3: - handle xenstore errors - add an in-code comment about xenstore entries - less verbose output - clean-up error path in main Changes in v2: - do not set HVM_PARAM_STORE_EVTCHN twice - rename restore_xenstore to create_xenstore - increase maxmem connection reconnecting --- tools/helpers/Makefile | 13 ++ tools/helpers/init-dom0less.c | 340 ++++++++++++++++++++++++++++++++++ 2 files changed, 353 insertions(+) create mode 100644 tools/helpers/init-dom0less.c --- tools/helpers/Makefile | 13 ++ tools/helpers/init-dom0less.c | 345 ++++++++++++++++++++++++++++++++++ 2 files changed, 358 insertions(+) create mode 100644 tools/helpers/init-dom0less.c diff --git a/tools/helpers/Makefile b/tools/helpers/Makefile index 7f6c422440..8d78ab1e90 100644 --- a/tools/helpers/Makefile +++ b/tools/helpers/Makefile @@ -10,6 +10,9 @@ ifeq ($(CONFIG_Linux),y) ifeq ($(CONFIG_X86),y) PROGS +=3D init-xenstore-domain endif +ifeq ($(CONFIG_ARM),y) +PROGS +=3D init-dom0less +endif endif =20 XEN_INIT_DOM0_OBJS =3D xen-init-dom0.o init-dom-json.o @@ -26,6 +29,13 @@ $(INIT_XENSTORE_DOMAIN_OBJS): CFLAGS +=3D $(CFLAGS_libxe= nstore) $(INIT_XENSTORE_DOMAIN_OBJS): CFLAGS +=3D $(CFLAGS_libxenlight) $(INIT_XENSTORE_DOMAIN_OBJS): CFLAGS +=3D -include $(XEN_ROOT)/tools/confi= g.h =20 +INIT_DOM0LESS_OBJS =3D init-dom0less.o init-dom-json.o +$(INIT_DOM0LESS_OBJS): CFLAGS +=3D $(CFLAGS_libxentoollog) +$(INIT_DOM0LESS_OBJS): CFLAGS +=3D $(CFLAGS_libxenstore) +$(INIT_DOM0LESS_OBJS): CFLAGS +=3D $(CFLAGS_libxenlight) +$(INIT_DOM0LESS_OBJS): CFLAGS +=3D $(CFLAGS_libxenctrl) +$(INIT_DOM0LESS_OBJS): CFLAGS +=3D $(CFLAGS_libxenevtchn) + .PHONY: all all: $(PROGS) =20 @@ -35,6 +45,9 @@ xen-init-dom0: $(XEN_INIT_DOM0_OBJS) init-xenstore-domain: $(INIT_XENSTORE_DOMAIN_OBJS) $(CC) $(LDFLAGS) -o $@ $(INIT_XENSTORE_DOMAIN_OBJS) $(LDLIBS_libxentoollo= g) $(LDLIBS_libxenstore) $(LDLIBS_libxenctrl) $(LDLIBS_libxenguest) $(LDLIB= S_libxenlight) $(APPEND_LDFLAGS) =20 +init-dom0less: $(INIT_DOM0LESS_OBJS) + $(CC) $(LDFLAGS) -o $@ $(INIT_DOM0LESS_OBJS) $(LDLIBS_libxenctrl) $(LDLIB= S_libxenevtchn) $(LDLIBS_libxentoollog) $(LDLIBS_libxenstore) $(LDLIBS_libx= enlight) $(LDLIBS_libxenguest) $(LDLIBS_libxenforeignmemory) $(APPEND_LDFLA= GS) + .PHONY: install install: all $(INSTALL_DIR) $(DESTDIR)$(LIBEXEC_BIN) diff --git a/tools/helpers/init-dom0less.c b/tools/helpers/init-dom0less.c new file mode 100644 index 0000000000..3e7ad54da7 --- /dev/null +++ b/tools/helpers/init-dom0less.c @@ -0,0 +1,345 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "init-dom-json.h" + +#define XENSTORE_PFN_OFFSET 1 +#define STR_MAX_LENGTH 64 + +static int alloc_xs_page(struct xc_interface_core *xch, + libxl_dominfo *info, + uint64_t *xenstore_pfn) +{ + int rc; + const xen_pfn_t base =3D GUEST_MAGIC_BASE >> XC_PAGE_SHIFT; + xen_pfn_t p2m =3D (GUEST_MAGIC_BASE >> XC_PAGE_SHIFT) + XENSTORE_PFN_O= FFSET; + + rc =3D xc_domain_setmaxmem(xch, info->domid, + info->max_memkb + (XC_PAGE_SIZE/1024)); + if (rc < 0) + return rc; + + rc =3D xc_domain_populate_physmap_exact(xch, info->domid, 1, 0, 0, &p2= m); + if (rc < 0) + return rc; + + *xenstore_pfn =3D base + XENSTORE_PFN_OFFSET; + rc =3D xc_clear_domain_page(xch, info->domid, *xenstore_pfn); + if (rc < 0) + return rc; + + return 0; +} + +static bool do_xs_write_dom(struct xs_handle *xsh, xs_transaction_t t, + domid_t domid, char *path, char *val) +{ + char full_path[STR_MAX_LENGTH]; + struct xs_permissions perms[2]; + + perms[0].id =3D domid; + perms[0].perms =3D XS_PERM_NONE; + perms[1].id =3D 0; + perms[1].perms =3D XS_PERM_READ; + + if (snprintf(full_path, STR_MAX_LENGTH, + "/local/domain/%u/%s", domid, path) < 0) + return false; + if (!xs_write(xsh, t, full_path, val, strlen(val))) + return false; + return xs_set_permissions(xsh, t, full_path, perms, 2); +} + +static bool do_xs_write_libxl(struct xs_handle *xsh, xs_transaction_t t, + domid_t domid, char *path, char *val) +{ + char full_path[STR_MAX_LENGTH]; + + if (snprintf(full_path, STR_MAX_LENGTH, + "/libxl/%u/%s", domid, path) < 0) + return false; + return xs_write(xsh, t, full_path, val, strlen(val)); +} + +static bool do_xs_write_vm(struct xs_handle *xsh, xs_transaction_t t, + libxl_uuid uuid, char *path, char *val) +{ + char full_path[STR_MAX_LENGTH]; + + if (snprintf(full_path, STR_MAX_LENGTH, + "/vm/" LIBXL_UUID_FMT "/%s", LIBXL_UUID_BYTES(uuid), path= ) < 0) + return false; + return xs_write(xsh, t, full_path, val, strlen(val)); +} + +/* + * The xenstore nodes are the xenstore nodes libxl writes at domain + * creation. + * + * The list was retrieved by running xenstore-ls on a corresponding + * domain started by xl/libxl. + */ +static int create_xenstore(struct xs_handle *xsh, + libxl_dominfo *info, libxl_uuid uuid, + evtchn_port_t xenstore_port) +{ + domid_t domid; + unsigned int i; + char uuid_str[STR_MAX_LENGTH]; + char dom_name_str[STR_MAX_LENGTH]; + char vm_val_str[STR_MAX_LENGTH]; + char id_str[STR_MAX_LENGTH]; + char max_memkb_str[STR_MAX_LENGTH]; + char target_memkb_str[STR_MAX_LENGTH]; + char cpu_str[STR_MAX_LENGTH]; + char xenstore_port_str[STR_MAX_LENGTH]; + char ring_ref_str[STR_MAX_LENGTH]; + xs_transaction_t t; + struct timeval start_time; + char start_time_str[STR_MAX_LENGTH]; + int rc; + + if (gettimeofday(&start_time, NULL) < 0) + return -errno; + rc =3D snprintf(start_time_str, STR_MAX_LENGTH, "%jd.%02d", + (intmax_t)start_time.tv_sec, (int)start_time.tv_usec / 10000); + if (rc < 0) + return rc; + + domid =3D info->domid; + rc =3D snprintf(id_str, STR_MAX_LENGTH, "%u", domid); + if (rc < 0) + return rc; + rc =3D snprintf(dom_name_str, STR_MAX_LENGTH, "dom0less-%u", domid); + if (rc < 0) + return rc; + rc =3D snprintf(uuid_str, STR_MAX_LENGTH, LIBXL_UUID_FMT, LIBXL_UUID_B= YTES(uuid)); + if (rc < 0) + return rc; + rc =3D snprintf(vm_val_str, STR_MAX_LENGTH, + "vm/" LIBXL_UUID_FMT, LIBXL_UUID_BYTES(uuid)); + if (rc < 0) + return rc; + rc =3D snprintf(max_memkb_str, STR_MAX_LENGTH, "%lu", info->max_memkb); + if (rc < 0) + return rc; + rc =3D snprintf(target_memkb_str, STR_MAX_LENGTH, "%lu", info->current= _memkb); + if (rc < 0) + return rc; + rc =3D snprintf(ring_ref_str, STR_MAX_LENGTH, "%lld", + (GUEST_MAGIC_BASE >> XC_PAGE_SHIFT) + XENSTORE_PFN_OFFSE= T); + if (rc < 0) + return rc; + rc =3D snprintf(xenstore_port_str, STR_MAX_LENGTH, "%u", xenstore_port= ); + if (rc < 0) + return rc; + +retry_transaction: + t =3D xs_transaction_start(xsh); + if (t =3D=3D XBT_NULL) + return -errno; + + rc =3D -EIO; + /* /vm */ + if (!do_xs_write_vm(xsh, t, uuid, "name", dom_name_str)) goto err; + if (!do_xs_write_vm(xsh, t, uuid, "uuid", uuid_str)) goto err; + if (!do_xs_write_vm(xsh, t, uuid, "start_time", start_time_str)) goto = err; + + /* /domain */ + if (!do_xs_write_dom(xsh, t, domid, "vm", vm_val_str)) goto err; + if (!do_xs_write_dom(xsh, t, domid, "name", dom_name_str)) goto err; + if (!do_xs_write_dom(xsh, t, domid, "cpu", "")) goto err; + for (i =3D 0; i < info->vcpu_max_id; i++) { + rc =3D snprintf(cpu_str, STR_MAX_LENGTH, "cpu/%u/availability/", i= ); + if (rc < 0) + goto err; + rc =3D -EIO; + if (!do_xs_write_dom(xsh, t, domid, cpu_str, + (info->cpupool & (1 << i)) ? "online" : "offl= ine")) + goto err; + } + + if (!do_xs_write_dom(xsh, t, domid, "memory", "")) goto err; + if (!do_xs_write_dom(xsh, t, domid, "memory/static-max", max_memkb_str= )) goto err; + if (!do_xs_write_dom(xsh, t, domid, "memory/target", target_memkb_str)= ) goto err; + if (!do_xs_write_dom(xsh, t, domid, "memory/videoram", "-1")) goto err; + + if (!do_xs_write_dom(xsh, t, domid, "device", "")) goto err; + if (!do_xs_write_dom(xsh, t, domid, "device/suspend", "")) goto err; + if (!do_xs_write_dom(xsh, t, domid, "device/suspend/event-channel", ""= )) goto err; + + if (!do_xs_write_dom(xsh, t, domid, "control", "")) goto err; + if (!do_xs_write_dom(xsh, t, domid, "control/shutdown", "")) goto err; + if (!do_xs_write_dom(xsh, t, domid, "control/feature-poweroff", "1")) = goto err; + if (!do_xs_write_dom(xsh, t, domid, "control/feature-reboot", "1")) go= to err; + if (!do_xs_write_dom(xsh, t, domid, "control/feature-suspend", "")) go= to err; + if (!do_xs_write_dom(xsh, t, domid, "control/sysrq", "")) goto err; + if (!do_xs_write_dom(xsh, t, domid, "control/platform-feature-multipro= cessor-suspend", "1")) goto err; + if (!do_xs_write_dom(xsh, t, domid, "control/platform-feature-xs_reset= _watches", "1")) goto err; + + if (!do_xs_write_dom(xsh, t, domid, "domid", id_str)) goto err; + if (!do_xs_write_dom(xsh, t, domid, "data", "")) goto err; + if (!do_xs_write_dom(xsh, t, domid, "drivers", "")) goto err; + if (!do_xs_write_dom(xsh, t, domid, "feature", "")) goto err; + if (!do_xs_write_dom(xsh, t, domid, "attr", "")) goto err; + + if (!do_xs_write_dom(xsh, t, domid, "store/port", xenstore_port_str)) = goto err; + if (!do_xs_write_dom(xsh, t, domid, "store/ring-ref", ring_ref_str)) g= oto err; + + if (!do_xs_write_libxl(xsh, t, domid, "type", "pvh")) goto err; + if (!do_xs_write_libxl(xsh, t, domid, "dm-version", "qemu_xen")) goto = err; + + if (!xs_transaction_end(xsh, t, false)) { + if (errno =3D=3D EAGAIN) + goto retry_transaction; + else + return -errno; + } + + return 0; + +err: + xs_transaction_end(xsh, t, true); + return rc; +} + +static int init_domain(struct xs_handle *xsh, + struct xc_interface_core *xch, + xenforeignmemory_handle *xfh, + libxl_dominfo *info) +{ + libxl_uuid uuid; + uint64_t xenstore_evtchn, xenstore_pfn; + int rc; + struct xenstore_domain_interface *intf; + + printf("Init dom0less domain: %u\n", info->domid); + + rc =3D xc_hvm_param_get(xch, info->domid, HVM_PARAM_STORE_EVTCHN, + &xenstore_evtchn); + if (rc !=3D 0) { + printf("Failed to get HVM_PARAM_STORE_EVTCHN\n"); + return 1; + } + + /* no xen,enhanced; nothing to do */ + if (!xenstore_evtchn) + return 0; + + /* Alloc xenstore page */ + if (alloc_xs_page(xch, info, &xenstore_pfn) !=3D 0) { + printf("Error on alloc magic pages\n"); + return 1; + } + + intf =3D xenforeignmemory_map(xfh, info->domid, PROT_READ | PROT_WRITE= , 1, + &xenstore_pfn, NULL); + if (!intf) { + printf("Error mapping xenstore page\n"); + return 1; + } + intf->connection =3D XENSTORE_RECONNECT; + xenforeignmemory_unmap(xfh, intf, 1); + + rc =3D xc_dom_gnttab_seed(xch, info->domid, true, + (xen_pfn_t)-1, xenstore_pfn, 0, 0); + if (rc) + err(1, "xc_dom_gnttab_seed"); + + libxl_uuid_generate(&uuid); + xc_domain_sethandle(xch, info->domid, libxl_uuid_bytearray(&uuid)); + + rc =3D gen_stub_json_config(info->domid, &uuid); + if (rc) + err(1, "gen_stub_json_config"); + + /* Now everything is ready: set HVM_PARAM_STORE_PFN */ + rc =3D xc_hvm_param_set(xch, info->domid, HVM_PARAM_STORE_PFN, + xenstore_pfn); + if (rc < 0) + return rc; + + rc =3D create_xenstore(xsh, info, uuid, xenstore_evtchn); + if (rc) + err(1, "writing to xenstore"); + + rc =3D xs_introduce_domain(xsh, info->domid, + (GUEST_MAGIC_BASE >> XC_PAGE_SHIFT) + XENSTORE_PFN_OFFSET, + xenstore_evtchn); + if (!rc) + err(1, "xs_introduce_domain"); + return 0; +} + +/* Check if domain has been configured in XS */ +static bool domain_exists(struct xs_handle *xsh, int domid) +{ + return xs_is_domain_introduced(xsh, domid); +} + +int main(int argc, char **argv) +{ + libxl_dominfo *info =3D NULL; + libxl_ctx *ctx; + int nb_vm =3D 0, rc =3D 0, i; + struct xs_handle *xsh =3D NULL; + struct xc_interface_core *xch =3D NULL; + xenforeignmemory_handle *xfh =3D NULL; + + /* TODO reuse libxl xsh connection */ + xsh =3D xs_open(0); + xch =3D xc_interface_open(0, 0, 0); + xfh =3D xenforeignmemory_open(0, 0); + if (xsh =3D=3D NULL || xch =3D=3D NULL || xfh =3D=3D NULL) { + fprintf(stderr, "Cannot open xc/xs/xenforeignmemory interfaces"); + rc =3D -errno; + goto out; + } + + rc =3D libxl_ctx_alloc(&ctx, LIBXL_VERSION, 0, NULL); + if (rc) { + fprintf(stderr, "cannot init xl context\n"); + goto out; + } + + info =3D libxl_list_domain(ctx, &nb_vm); + if (!info) { + fprintf(stderr, "libxl_list_vm failed.\n"); + rc =3D -1; + goto out; + } + + for (i =3D 0; i < nb_vm; i++) { + domid_t domid =3D info[i].domid; + + /* Don't need to check for Dom0 */ + if (!domid) + continue; + + printf("Checking domid: %u\n", domid); + if (!domain_exists(xsh, domid)) { + rc =3D init_domain(xsh, xch, xfh, &info[i]); + if (rc < 0) { + fprintf(stderr, "init_domain failed.\n"); + goto out; + } + } else { + printf("Domain %u has already been initialized\n", domid); + } + } +out: + libxl_dominfo_list_free(info, nb_vm); + return rc; +} --=20 2.25.1 From nobody Fri Nov 29 00:55:40 2024 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; dkim=pass; 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=pass(p=none dis=none) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; t=1652476081; cv=none; d=zohomail.com; s=zohoarc; b=RcxgBtaXpCol2FIcKJypCwaTFKjU6WLJS9K1zH934+TGerEQKRbrd5j9EDs+qzmzlOloIyaIl8UzL60SWd1KaniX4XtdunFKjvHvHHm/+CqOdp8toTLnQCuhHvn34FfE7Nq+MLaZwMYDW/CYQbsuCY3ZoRR+RA4LRfF6wmEQGGM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1652476081; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652476056; bh=vBoz7dmTWhlc7PPw4Rw0ri1k93jgoLdc1Q6ZpNpIcJU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UaoUy68K5A3ytuyZMpEiPm5yV1Q8+4dPhgymDyOtga9Ou6ALz1CPdTkRStQ0rkvBb WkkTLNDrmPbdhO6WC8rYsgvNb9LZTq6A/2X7dHOKksVzPfktSawTJ50ADW0lelRjtG KgEjW8Db+ZvQw45bX+yPaPqbXqd3quWtibbpdeQ3zcFmgHO1OTBFv5qFu83nuINfGv zpfmDO03XvdmpbxM3It5/e4z3PiMwbc8AxlD/PjWaO0qruJrh5O1f87wNIpDsQOzYC 7rXhEwcGib5zYR5RZy64RxQ+kfs99AIwJRjUFtM4jvN/vx+rxPHjUmdn+RUE7kHYKv v5gjNZNkCGB6A== From: Stefano Stabellini To: xen-devel@lists.xenproject.org Cc: sstabellini@kernel.org, jgross@suse.com, Bertrand.Marquis@arm.com, julien@xen.org, Volodymyr_Babchuk@epam.com, Stefano Stabellini , Luca Fancellu , Julien Grall Subject: [PATCH v7 7/7] docs: document dom0less + PV drivers Date: Fri, 13 May 2022 14:07:30 -0700 Message-Id: <20220513210730.679871-7-sstabellini@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1652476083962100006 Content-Type: text/plain; charset="utf-8" From: Stefano Stabellini Document how to use the feature and how the implementation works. Signed-off-by: Stefano Stabellini Reviewed-by: Luca Fancellu Acked-by: Julien Grall --- docs/features/dom0less.pandoc | 43 ++++++++++++++++++++++++++++++++--- 1 file changed, 40 insertions(+), 3 deletions(-) --- docs/features/dom0less.pandoc | 43 ++++++++++++++++++++++++++++++++--- 1 file changed, 40 insertions(+), 3 deletions(-) diff --git a/docs/features/dom0less.pandoc b/docs/features/dom0less.pandoc index c9edb529e1..725afa0558 100644 --- a/docs/features/dom0less.pandoc +++ b/docs/features/dom0less.pandoc @@ -90,6 +90,46 @@ Otherwise, they may be unusable in Xen (for instance if = they are compressed). =20 See docs/misc/arm/device-tree/booting.txt for more information. =20 +PV Drivers +---------- + +It is possible to use PV drivers with dom0less guests with some +restrictions: + +- dom0less domUs that want to use PV drivers support should have the + "xen,enhanced" property set under their device tree nodes (see + docs/misc/arm/device-tree/booting.txt) +- a dom0 must be present (or another domain with enough privileges to + run the toolstack) +- after dom0 is booted, the utility "init-dom0less" must be run +- do not run "init-dom0less" while creating other guests with xl + +After the execution of init-dom0less, it is possible to use "xl" to +hotplug PV drivers to dom0less guests. E.g. xl network-attach domU. + +The implementation works as follows: +- Xen allocates the xenstore event channel for each dom0less domU that + has the "xen,enhanced" property, and sets HVM_PARAM_STORE_EVTCHN +- Xen does *not* allocate the xenstore page and sets HVM_PARAM_STORE_PFN + to ~0ULL (invalid) +- Dom0less domU kernels check that HVM_PARAM_STORE_PFN is set to invalid + - Old kernels will continue without xenstore support (Note: some old + buggy kernels might crash because they don't check the validity of + HVM_PARAM_STORE_PFN before using it! Disable "xen,enhanced" in + those cases) + - New kernels will wait for a notification on the xenstore event + channel (HVM_PARAM_STORE_EVTCHN) before continuing with the + initialization +- Once dom0 is booted, init-dom0less is executed: + - it allocates the xenstore shared page and sets HVM_PARAM_STORE_PFN + - it calls xs_introduce_domain +- Xenstored notices the new domain, initializes interfaces as usual, and + sends an event channel notification to the domain using the xenstore + event channel (HVM_PARAM_STORE_EVTCHN) +- The Linux domU kernel receives the event channel notification, checks + HVM_PARAM_STORE_PFN again and continue with the initialization + + Limitations ----------- =20 @@ -107,9 +147,6 @@ limitations: information, the GIC version exposed to the domains started by Xen at boot is the same as the native GIC version. =20 -- No PV drivers. There is no support for PV devices at the moment. All - devices need to be statically assigned to guests. - - Pinning vCPUs of domains started by Xen at boot can be done from the control domain, using `xl vcpu-pin` as usual. It is not currently possible to configure vCPU pinning without a control domain. --=20 2.25.1