From patchwork Fri Apr 1 00:38:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 12797817 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8DD44C433F5 for ; Fri, 1 Apr 2022 00:39:09 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.297160.506145 (Exim 4.92) (envelope-from ) id 1na5Jb-0000iw-40; Fri, 01 Apr 2022 00:38:59 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 297160.506145; Fri, 01 Apr 2022 00:38:59 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1na5Ja-0000dR-Dh; Fri, 01 Apr 2022 00:38:58 +0000 Received: by outflank-mailman (input) for mailman id 297160; Fri, 01 Apr 2022 00:38:55 +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 1na5JX-00087e-HS for xen-devel@lists.xenproject.org; Fri, 01 Apr 2022 00:38:55 +0000 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 1b312796-b154-11ec-a405-831a346695d4; Fri, 01 Apr 2022 02:38:53 +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 C13F9B822B4; Fri, 1 Apr 2022 00:38:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 19EB2C34115; Fri, 1 Apr 2022 00:38:52 +0000 (UTC) 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: 1b312796-b154-11ec-a405-831a346695d4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648773532; bh=bKlaACyobMzZqVlommlo53UDbjiZ7/QiZBJFdbFnFaw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sr8JLH+zcSmfPwQCUPAKzjR2SLXM3cPGkNvqmUK/Qt0Axlv8YNEXep1m+DUwNFTsK 1X3skIp36V/NB7Aua1xcSZzqmfNiwO5Ad+s28fZVAk45823hv2qUXnbDSOYvF1f6ML OTT0DgbwrM+fPBvQ3JfQ2e7nmgKkgaT0XDzX/s3eMqB1Ebm81/geyedF5lV28KFLa0 xMCcGdueg5ugJMJ8PH7ZH9X1J1x9EAoBMFWCLoD87IUaLVf9VBCWGP9dr1xHgTGAe2 KGQPt1DRwFv/4rPmUgkLGXBYCFnOAHTWf5bcKmXQ08jvaa1+OY9n9aS1ws2t0W4SAL kxpma20BU3j4w== 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 , Bertrand Marquis Subject: [PATCH v4 6/9] xen/arm: configure dom0less domain for enabling xenstore after boot Date: Thu, 31 Mar 2022 17:38:44 -0700 Message-Id: <20220401003847.38393-6-sstabellini@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 From: Luca Miccio 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 CC: Julien Grall CC: Volodymyr Babchuk CC: Bertrand Marquis --- 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/arch/arm/domain_build.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index b22fe95d92..a8ad95ce40 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -2806,6 +2807,8 @@ static int __init prepare_dtb_domU(struct domain *d, struct kernel_info *kinfo) int ret; kinfo->phandle_gic = GUEST_PHANDLE_GIC; + kinfo->gnttab_start = GUEST_GNTTAB_BASE; + kinfo->gnttab_size = GUEST_GNTTAB_SIZE; addrcells = GUEST_ROOT_ADDRESS_CELLS; sizecells = GUEST_ROOT_SIZE_CELLS; @@ -2880,6 +2883,13 @@ static int __init prepare_dtb_domU(struct domain *d, struct kernel_info *kinfo) goto err; } + if ( kinfo->dom0less_enhanced ) + { + ret = make_hypervisor_node(d, kinfo, addrcells, sizecells); + if ( ret ) + goto err; + } + ret = fdt_end_node(kinfo->fdt); if ( ret < 0 ) goto err; @@ -3146,6 +3156,25 @@ static int __init construct_domain(struct domain *d, struct kernel_info *kinfo) return 0; } +static int __init alloc_xenstore_evtchn(struct domain *d) +{ + evtchn_alloc_unbound_t alloc; + int rc; + + alloc.dom = d->domain_id; + alloc.remote_dom = hardware_domain->domain_id; + rc = evtchn_alloc_unbound(&alloc); + if ( rc ) + { + printk("Failed allocating event channel for domain\n"); + return rc; + } + + d->arch.hvm.params[HVM_PARAM_STORE_EVTCHN] = alloc.port; + + return 0; +} + static int __init construct_domU(struct domain *d, const struct dt_device_node *node) { @@ -3210,6 +3239,14 @@ static int __init construct_domU(struct domain *d, if ( rc < 0 ) return rc; + if ( kinfo.dom0less_enhanced ) + { + rc = alloc_xenstore_evtchn(d); + if ( rc < 0 ) + return rc; + d->arch.hvm.params[HVM_PARAM_STORE_PFN] = ~0ULL; + } + return rc; }