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Mon, 5 Feb 2024 10:52:30 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id QOmNA+69wGXmNgAAD6G6ig (envelope-from ); Mon, 05 Feb 2024 10:52:30 +0000 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: a8c4cb0b-c414-11ee-98f5-efadbce2ee36 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1707130350; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sBN45VY796bPT208E7z1cKUSQ/jSCHWuzgN6GPy8ckw=; b=XPLQmfsImAnW4qPMeUaZMNYUKSCWkTag5wGDPSYySdjzxWw0LTfK7czpaKIGUbR2VOgO/U w/sayaMlagAz0M9Fclx3CRPeO7wYiBdhqS4ushlEwZ2F8eoSOVBWGaxr7mgKgLiW+ZIqQ4 BWDxSi9ki62/PDIMB4SWLuhbqmMLaTY= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1707130350; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sBN45VY796bPT208E7z1cKUSQ/jSCHWuzgN6GPy8ckw=; b=XPLQmfsImAnW4qPMeUaZMNYUKSCWkTag5wGDPSYySdjzxWw0LTfK7czpaKIGUbR2VOgO/U w/sayaMlagAz0M9Fclx3CRPeO7wYiBdhqS4ushlEwZ2F8eoSOVBWGaxr7mgKgLiW+ZIqQ4 BWDxSi9ki62/PDIMB4SWLuhbqmMLaTY= From: Juergen Gross To: xen-devel@lists.xenproject.org Cc: Juergen Gross , Wei Liu , Julien Grall , Anthony PERARD , Jason Andryuk , Julien Grall Subject: [PATCH v4 26/32] tools/xenstored: rework ring page (un)map functions Date: Mon, 5 Feb 2024 11:49:55 +0100 Message-Id: <20240205105001.24171-27-jgross@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240205105001.24171-1-jgross@suse.com> References: <20240205105001.24171-1-jgross@suse.com> MIME-Version: 1.0 Authentication-Results: smtp-out1.suse.de; none X-Spamd-Result: default: False [0.89 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; R_MISSING_CHARSET(2.50)[]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; REPLY(-4.00)[]; BROKEN_CONTENT_TYPE(1.50)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_SEVEN(0.00)[7]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_CC(0.00)[suse.com,xen.org,citrix.com,gmail.com,amazon.com]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-0.01)[50.16%] When [un]mapping the ring page of a Xenstore client, different actions are required for "normal" guests and dom0. Today this distinction is made at call site. Move this distinction into [un]map_interface() instead, avoiding code duplication and preparing special handling for [un]mapping the stub domain's ring page. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk Reviewed-by: Julien Grall --- tools/xenstored/domain.c | 31 +++++++++++++------------------ 1 file changed, 13 insertions(+), 18 deletions(-) diff --git a/tools/xenstored/domain.c b/tools/xenstored/domain.c index 040df98b8c..af80a8221d 100644 --- a/tools/xenstored/domain.c +++ b/tools/xenstored/domain.c @@ -497,14 +497,20 @@ static const struct interface_funcs domain_funcs = { static void *map_interface(domid_t domid) { + if (domid == xenbus_master_domid()) + return xenbus_map(); + return xengnttab_map_grant_ref(*xgt_handle, domid, GNTTAB_RESERVED_XENSTORE, PROT_READ|PROT_WRITE); } -static void unmap_interface(void *interface) +static void unmap_interface(domid_t domid, void *interface) { - xengnttab_unmap(*xgt_handle, interface, 1); + if (domid == xenbus_master_domid()) + unmap_xenbus(interface); + else + xengnttab_unmap(*xgt_handle, interface, 1); } static int domain_tree_remove_sub(const void *ctx, struct connection *conn, @@ -594,14 +600,8 @@ static int destroy_domain(void *_domain) eprintf("> Unbinding port %i failed!\n", domain->port); } - if (domain->interface) { - /* Domain 0 was mapped by dom0_init, so it must be unmapped - using munmap() and not the grant unmap call. */ - if (domain->domid == dom0_domid) - unmap_xenbus(domain->interface); - else - unmap_interface(domain->interface); - } + if (domain->interface) + unmap_interface(domain->domid, domain->interface); fire_special_watches("@releaseDomain"); @@ -966,18 +966,13 @@ static struct domain *introduce_domain(const void *ctx, return NULL; if (!domain->introduced) { - interface = is_master_domain ? xenbus_map() - : map_interface(domid); + interface = map_interface(domid); if (!interface && !restore) return NULL; if (new_domain(domain, port, restore)) { rc = errno; - if (interface) { - if (is_master_domain) - unmap_xenbus(interface); - else - unmap_interface(interface); - } + if (interface) + unmap_interface(domid, interface); errno = rc; return NULL; }