From patchwork Tue Jan 5 13:12:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Beulich X-Patchwork-Id: 11998865 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7FF16C433E0 for ; Tue, 5 Jan 2021 13:12:33 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 4385822240 for ; Tue, 5 Jan 2021 13:12:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4385822240 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.61942.109289 (Exim 4.92) (envelope-from ) id 1kwm8I-0000tp-Jm; Tue, 05 Jan 2021 13:12:18 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 61942.109289; Tue, 05 Jan 2021 13:12:18 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kwm8I-0000ti-Gf; Tue, 05 Jan 2021 13:12:18 +0000 Received: by outflank-mailman (input) for mailman id 61942; Tue, 05 Jan 2021 13:12:17 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kwm8H-0000tZ-Qa for xen-devel@lists.xenproject.org; Tue, 05 Jan 2021 13:12:17 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 93e5ae14-b21a-4246-9a5f-affa686567d1; Tue, 05 Jan 2021 13:12:16 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C2905AD0B; Tue, 5 Jan 2021 13:12:15 +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: 93e5ae14-b21a-4246-9a5f-affa686567d1 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1609852335; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lq6jmPFxyGjXjD9MsCgMeKHr6YBRuiaVaAtrxirfbsc=; b=Yqs11mE5pYFEholJIsyvQ1omhKx0WfPOBJOAg5Zh4xaOOaFacuHEQs+w+zvDtL3r0KIUaK znENz2MWIK0fqJWS/npczgOMh64mECuMvHhrjzdq73hkFu7Xl8lRdDdgtHPYpFm+Dpwdk1 /4ssc/XzWemGZYvUPfecdffOJrSYMCE= Subject: [PATCH v4 07/10] evtchn: add helper for port_is_valid() + evtchn_from_port() From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , George Dunlap , Ian Jackson , Julien Grall , Wei Liu , Stefano Stabellini References: Message-ID: Date: Tue, 5 Jan 2021 14:12:15 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US The combination is pretty common, so adding a simple local helper seems worthwhile. Make it const- and type-correct, in turn requiring the two called function to also be const-correct (and at this occasion also make them type-correct). Signed-off-by: Jan Beulich Acked-by: Julien Grall --- v4: New. --- a/xen/common/event_channel.c +++ b/xen/common/event_channel.c @@ -147,6 +147,11 @@ static bool virq_is_global(unsigned int return true; } +static struct evtchn *_evtchn_from_port(const struct domain *d, + evtchn_port_t port) +{ + return port_is_valid(d, port) ? evtchn_from_port(d, port) : NULL; +} static struct evtchn *alloc_evtchn_bucket(struct domain *d, unsigned int port) { @@ -361,9 +366,9 @@ static long evtchn_bind_interdomain(evtc ERROR_EXIT(lport); lchn = evtchn_from_port(ld, lport); - if ( !port_is_valid(rd, rport) ) + rchn = _evtchn_from_port(rd, rport); + if ( !rchn ) ERROR_EXIT_DOM(-EINVAL, rd); - rchn = evtchn_from_port(rd, rport); double_evtchn_lock(lchn, rchn); @@ -600,15 +605,12 @@ static long evtchn_bind_pirq(evtchn_bind int evtchn_close(struct domain *d1, int port1, bool guest) { struct domain *d2 = NULL; - struct evtchn *chn1, *chn2; - int port2; + struct evtchn *chn1 = _evtchn_from_port(d1, port1), *chn2; long rc = 0; - if ( !port_is_valid(d1, port1) ) + if ( !chn1 ) return -EINVAL; - chn1 = evtchn_from_port(d1, port1); - again: write_lock(&d1->event_lock); @@ -695,10 +697,8 @@ int evtchn_close(struct domain *d1, int goto out; } - port2 = chn1->u.interdomain.remote_port; - BUG_ON(!port_is_valid(d2, port2)); - - chn2 = evtchn_from_port(d2, port2); + chn2 = _evtchn_from_port(d2, chn1->u.interdomain.remote_port); + BUG_ON(!chn2); BUG_ON(chn2->state != ECS_INTERDOMAIN); BUG_ON(chn2->u.interdomain.remote_dom != d1); @@ -736,15 +736,13 @@ int evtchn_close(struct domain *d1, int int evtchn_send(struct domain *ld, unsigned int lport) { - struct evtchn *lchn, *rchn; + struct evtchn *lchn = _evtchn_from_port(ld, lport), *rchn; struct domain *rd; int rport, ret = 0; - if ( !port_is_valid(ld, lport) ) + if ( !lchn ) return -EINVAL; - lchn = evtchn_from_port(ld, lport); - evtchn_read_lock(lchn); /* Guest cannot send via a Xen-attached event channel. */ @@ -956,7 +954,6 @@ int evtchn_status(evtchn_status_t *statu { struct domain *d; domid_t dom = status->dom; - int port = status->port; struct evtchn *chn; long rc = 0; @@ -964,14 +961,13 @@ int evtchn_status(evtchn_status_t *statu if ( d == NULL ) return -ESRCH; - if ( !port_is_valid(d, port) ) + chn = _evtchn_from_port(d, status->port); + if ( !chn ) { rcu_unlock_domain(d); return -EINVAL; } - chn = evtchn_from_port(d, port); - evtchn_read_lock(chn); if ( consumer_is_xen(chn) ) @@ -1036,11 +1032,10 @@ long evtchn_bind_vcpu(unsigned int port, if ( (v = domain_vcpu(d, vcpu_id)) == NULL ) return -ENOENT; - if ( !port_is_valid(d, port) ) + chn = _evtchn_from_port(d, port); + if ( !chn ) return -EINVAL; - chn = evtchn_from_port(d, port); - write_lock(&d->event_lock); /* Guest cannot re-bind a Xen-attached event channel. */ @@ -1086,13 +1081,11 @@ long evtchn_bind_vcpu(unsigned int port, int evtchn_unmask(unsigned int port) { struct domain *d = current->domain; - struct evtchn *evtchn; + struct evtchn *evtchn = _evtchn_from_port(d, port); - if ( unlikely(!port_is_valid(d, port)) ) + if ( unlikely(!evtchn) ) return -EINVAL; - evtchn = evtchn_from_port(d, port); - evtchn_read_lock(evtchn); evtchn_port_unmask(d, evtchn); @@ -1175,14 +1168,12 @@ static long evtchn_set_priority(const st { struct domain *d = current->domain; unsigned int port = set_priority->port; - struct evtchn *chn; + struct evtchn *chn = _evtchn_from_port(d, port); long ret; - if ( !port_is_valid(d, port) ) + if ( !chn ) return -EINVAL; - chn = evtchn_from_port(d, port); - evtchn_read_lock(chn); ret = evtchn_port_set_priority(d, chn, set_priority->priority); @@ -1408,10 +1399,10 @@ void free_xen_event_channel(struct domai void notify_via_xen_event_channel(struct domain *ld, int lport) { - struct evtchn *lchn, *rchn; + struct evtchn *lchn = _evtchn_from_port(ld, lport), *rchn; struct domain *rd; - if ( !port_is_valid(ld, lport) ) + if ( !lchn ) { /* * Make sure ->is_dying is read /after/ ->valid_evtchns, pairing @@ -1422,8 +1413,6 @@ void notify_via_xen_event_channel(struct return; } - lchn = evtchn_from_port(ld, lport); - if ( !evtchn_read_trylock(lchn) ) return; @@ -1577,16 +1566,17 @@ static void domain_dump_evtchn_info(stru "Polling vCPUs: {%*pbl}\n" " port [p/m/s]\n", d->domain_id, d->max_vcpus, d->poll_mask); - for ( port = 1; port_is_valid(d, port); ++port ) + for ( port = 1; ; ++port ) { - struct evtchn *chn; + struct evtchn *chn = _evtchn_from_port(d, port); char *ssid; + if ( !chn ) + break; + if ( !(port & 0x3f) ) process_pending_softirqs(); - chn = evtchn_from_port(d, port); - if ( !evtchn_read_trylock(chn) ) { printk(" %4u in flux\n", port); --- a/xen/include/xen/event.h +++ b/xen/include/xen/event.h @@ -120,7 +120,7 @@ static inline void evtchn_read_unlock(st read_unlock(&evtchn->lock); } -static inline bool_t port_is_valid(struct domain *d, unsigned int p) +static inline bool port_is_valid(const struct domain *d, evtchn_port_t p) { if ( p >= read_atomic(&d->valid_evtchns) ) return false; @@ -135,7 +135,8 @@ static inline bool_t port_is_valid(struc return true; } -static inline struct evtchn *evtchn_from_port(struct domain *d, unsigned int p) +static inline struct evtchn *evtchn_from_port(const struct domain *d, + evtchn_port_t p) { if ( p < EVTCHNS_PER_BUCKET ) return &d->evtchn[array_index_nospec(p, EVTCHNS_PER_BUCKET)];