From patchwork Mon Nov 6 14:34:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 13446991 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.gnu.org (lists.gnu.org [209.51.188.17]) (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 7E738C4167B for ; Mon, 6 Nov 2023 14:36:56 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r00hX-0006gx-Lm; Mon, 06 Nov 2023 09:35:39 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r00hQ-0006f2-Kd; Mon, 06 Nov 2023 09:35:33 -0500 Received: from smtp-fw-2101.amazon.com ([72.21.196.25]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r00hL-0000Ji-JH; Mon, 06 Nov 2023 09:35:31 -0500 X-IronPort-AV: E=Sophos;i="6.03,281,1694736000"; d="scan'208";a="361122546" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-pdx-2b-m6i4x-189d700f.us-west-2.amazon.com) ([10.43.8.6]) by smtp-border-fw-2101.iad2.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Nov 2023 14:35:19 +0000 Received: from smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev (pdx2-ws-svc-p26-lb5-vlan3.pdx.amazon.com [10.39.38.70]) by email-inbound-relay-pdx-2b-m6i4x-189d700f.us-west-2.amazon.com (Postfix) with ESMTPS id 85A1640D84; Mon, 6 Nov 2023 14:35:16 +0000 (UTC) Received: from EX19MTAUWC001.ant.amazon.com [10.0.38.20:34329] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.34.186:2525] with esmtp (Farcaster) id 76d34537-32d9-44b2-b563-58d436590f5f; Mon, 6 Nov 2023 14:35:16 +0000 (UTC) X-Farcaster-Flow-ID: 76d34537-32d9-44b2-b563-58d436590f5f Received: from EX19MTAUWB001.ant.amazon.com (10.250.64.248) by EX19MTAUWC001.ant.amazon.com (10.250.64.174) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.39; Mon, 6 Nov 2023 14:35:15 +0000 Received: from u3832b3a9db3152.ant.amazon.com (10.106.83.6) by mail-relay.amazon.com (10.250.64.254) with Microsoft SMTP Server id 15.2.1118.39 via Frontend Transport; Mon, 6 Nov 2023 14:35:13 +0000 From: David Woodhouse To: CC: Kevin Wolf , Hanna Reitz , Peter Maydell , Stefano Stabellini , Anthony Perard , Paul Durrant , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini , Richard Henderson , Eduardo Habkost , "Michael S. Tsirkin" , Marcel Apfelbaum , Jason Wang , Marcelo Tosatti , , , Subject: [PATCH v4 01/17] i386/xen: Ignore VCPU_SSHOTTMR_future flag in set_singleshot_timer() Date: Mon, 6 Nov 2023 14:34:51 +0000 Message-ID: <20231106143507.1060610-2-dwmw2@infradead.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106143507.1060610-1-dwmw2@infradead.org> References: <20231106143507.1060610-1-dwmw2@infradead.org> MIME-Version: 1.0 Precedence: Bulk Received-SPF: none client-ip=72.21.196.25; envelope-from=prvs=667a8cc2a=dwmw2@infradead.org; helo=smtp-fw-2101.amazon.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: David Woodhouse Upstream Xen now ignores this flag¹, since the only guest kernel ever to use it was buggy. ¹ https://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=19c6cbd909 Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant --- target/i386/kvm/xen-emu.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c index 75b2c557b9..1dc9ab0d91 100644 --- a/target/i386/kvm/xen-emu.c +++ b/target/i386/kvm/xen-emu.c @@ -1077,17 +1077,13 @@ static int vcpuop_stop_periodic_timer(CPUState *target) * Must always be called with xen_timers_lock held. */ static int do_set_singleshot_timer(CPUState *cs, uint64_t timeout_abs, - bool future, bool linux_wa) + bool linux_wa) { CPUX86State *env = &X86_CPU(cs)->env; int64_t now = kvm_get_current_ns(); int64_t qemu_now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); int64_t delta = timeout_abs - now; - if (future && timeout_abs < now) { - return -ETIME; - } - if (linux_wa && unlikely((int64_t)timeout_abs < 0 || (delta > 0 && (uint32_t)(delta >> 50) != 0))) { /* @@ -1129,9 +1125,13 @@ static int vcpuop_set_singleshot_timer(CPUState *cs, uint64_t arg) } QEMU_LOCK_GUARD(&X86_CPU(cs)->env.xen_timers_lock); - return do_set_singleshot_timer(cs, sst.timeout_abs_ns, - !!(sst.flags & VCPU_SSHOTTMR_future), - false); + + /* + * We ignore the VCPU_SSHOTTMR_future flag, just as Xen now does. + * The only guest that ever used it, got it wrong. + * https://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=19c6cbd909 + */ + return do_set_singleshot_timer(cs, sst.timeout_abs_ns, false); } static int vcpuop_stop_singleshot_timer(CPUState *cs) @@ -1156,7 +1156,7 @@ static bool kvm_xen_hcall_set_timer_op(struct kvm_xen_exit *exit, X86CPU *cpu, err = vcpuop_stop_singleshot_timer(CPU(cpu)); } else { QEMU_LOCK_GUARD(&X86_CPU(cpu)->env.xen_timers_lock); - err = do_set_singleshot_timer(CPU(cpu), timeout, false, true); + err = do_set_singleshot_timer(CPU(cpu), timeout, true); } exit->u.hcall.result = err; return true; @@ -1844,7 +1844,7 @@ int kvm_put_xen_state(CPUState *cs) QEMU_LOCK_GUARD(&env->xen_timers_lock); if (env->xen_singleshot_timer_ns) { ret = do_set_singleshot_timer(cs, env->xen_singleshot_timer_ns, - false, false); + false); if (ret < 0) { return ret; }