From patchwork Thu Aug 24 15:41:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?SsO8cmdlbiBHcm/Dnw==?= X-Patchwork-Id: 13364386 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 1B63EC27C40 for ; Thu, 24 Aug 2023 15:41:33 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.590208.922335 (Exim 4.92) (envelope-from ) id 1qZCSO-00022K-TU; Thu, 24 Aug 2023 15:41:12 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 590208.922335; Thu, 24 Aug 2023 15:41:12 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qZCSO-00022D-Qo; Thu, 24 Aug 2023 15:41:12 +0000 Received: by outflank-mailman (input) for mailman id 590208; Thu, 24 Aug 2023 15:41:11 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qZCSN-00020o-Hf for xen-devel@lists.xenproject.org; Thu, 24 Aug 2023 15:41:11 +0000 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id a563424f-4294-11ee-9b0c-b553b5be7939; Thu, 24 Aug 2023 17:41:09 +0200 (CEST) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id CE83921890; Thu, 24 Aug 2023 15:41:08 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 73115132F2; Thu, 24 Aug 2023 15:41:08 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id LD64GhR652RlSAAAMHmgww (envelope-from ); Thu, 24 Aug 2023 15:41:08 +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: a563424f-4294-11ee-9b0c-b553b5be7939 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1692891668; 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; bh=9/kOeP6eJirlVSVxrRB3IZ2bMbCx1I/9IzEaeTk09ZY=; b=ZUWWuSKuwQ9meA8nLTMoldNyIiDZACendfPRUOtjf6WPvmItGcRWUJ+VznaE+ZqboueGI7 xG/+V0dZFvSmFec9cbgDOq2KOgAymZl/V0GznId1EPMwLPQxfzqByWyuKBh1LED2epBAlo 5WNg/bnZ2ElqfFTywJL0yZaHOADhJjg= From: Juergen Gross To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: Juergen Gross , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Boris Ostrovsky , Stefano Stabellini , Oleksandr Tyshchenko , xen-devel@lists.xenproject.org Subject: [PATCH] xen: simplify evtchn_do_upcall() call maze Date: Thu, 24 Aug 2023 17:41:06 +0200 Message-Id: <20230824154106.14799-1-jgross@suse.com> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 There are several functions involved for performing the functionality of evtchn_do_upcall(): - __xen_evtchn_do_upcall() doing the real work - xen_hvm_evtchn_do_upcall() just being a wrapper for __xen_evtchn_do_upcall(), exposed for external callers - xen_evtchn_do_upcall() calling __xen_evtchn_do_upcall(), too, but without any user Simplify this maze by: - removing the unused xen_evtchn_do_upcall() - removing xen_hvm_evtchn_do_upcall() as the only left caller of __xen_evtchn_do_upcall(), while renaming __xen_evtchn_do_upcall() to xen_evtchn_do_upcall() Signed-off-by: Juergen Gross Reviewed-by: Boris Ostrovsky Reviewed-by: Thomas Gleixner --- arch/x86/entry/common.c | 2 +- arch/x86/xen/enlighten.c | 2 +- arch/x86/xen/enlighten_hvm.c | 2 +- drivers/xen/events/events_base.c | 21 ++------------------- drivers/xen/platform-pci.c | 2 +- include/xen/events.h | 3 +-- 6 files changed, 7 insertions(+), 25 deletions(-) diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 6c2826417b33..93c60c0c9d4a 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -294,7 +294,7 @@ static void __xen_pv_evtchn_do_upcall(struct pt_regs *regs) inc_irq_stat(irq_hv_callback_count); - xen_hvm_evtchn_do_upcall(); + xen_evtchn_do_upcall(); set_irq_regs(old_regs); } diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index b8db2148c07d..0337392a3121 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -32,7 +32,7 @@ EXPORT_SYMBOL_GPL(hypercall_page); * &HYPERVISOR_shared_info->vcpu_info[cpu]. See xen_hvm_init_shared_info * and xen_vcpu_setup for details. By default it points to share_info->vcpu_info * but during boot it is switched to point to xen_vcpu_info. - * The pointer is used in __xen_evtchn_do_upcall to acknowledge pending events. + * The pointer is used in xen_evtchn_do_upcall to acknowledge pending events. */ DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c index a6820ca940bf..fbf37ae825bf 100644 --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -136,7 +136,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_xen_hvm_callback) inc_irq_stat(irq_hv_callback_count); - xen_hvm_evtchn_do_upcall(); + xen_evtchn_do_upcall(); set_irq_regs(old_regs); } diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index 3bdd5b59661d..0bb86e6c4d0a 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1704,7 +1704,7 @@ void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl) generic_handle_irq(irq); } -static int __xen_evtchn_do_upcall(void) +int xen_evtchn_do_upcall(void) { struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu); int ret = vcpu_info->evtchn_upcall_pending ? IRQ_HANDLED : IRQ_NONE; @@ -1735,24 +1735,7 @@ static int __xen_evtchn_do_upcall(void) return ret; } - -void xen_evtchn_do_upcall(struct pt_regs *regs) -{ - struct pt_regs *old_regs = set_irq_regs(regs); - - irq_enter(); - - __xen_evtchn_do_upcall(); - - irq_exit(); - set_irq_regs(old_regs); -} - -int xen_hvm_evtchn_do_upcall(void) -{ - return __xen_evtchn_do_upcall(); -} -EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall); +EXPORT_SYMBOL_GPL(xen_evtchn_do_upcall); /* Rebind a new event channel to an existing irq. */ void rebind_evtchn_irq(evtchn_port_t evtchn, int irq) diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c index fcc819131572..544d3f9010b9 100644 --- a/drivers/xen/platform-pci.c +++ b/drivers/xen/platform-pci.c @@ -64,7 +64,7 @@ static uint64_t get_callback_via(struct pci_dev *pdev) static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id) { - return xen_hvm_evtchn_do_upcall(); + return xen_evtchn_do_upcall(); } static int xen_allocate_irq(struct pci_dev *pdev) diff --git a/include/xen/events.h b/include/xen/events.h index 95970a2f7695..8f62d15eef90 100644 --- a/include/xen/events.h +++ b/include/xen/events.h @@ -106,8 +106,7 @@ int irq_from_virq(unsigned int cpu, unsigned int virq); evtchn_port_t evtchn_from_irq(unsigned irq); int xen_set_callback_via(uint64_t via); -void xen_evtchn_do_upcall(struct pt_regs *regs); -int xen_hvm_evtchn_do_upcall(void); +int xen_evtchn_do_upcall(void); /* Bind a pirq for a physical interrupt to an irq. */ int xen_bind_pirq_gsi_to_irq(unsigned gsi,