From mboxrd@z Thu Jan 1 00:00:00 1970 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 7E7CAC64EC4 for ; Wed, 22 Feb 2023 09:22:28 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pUlKK-00022w-NB; Wed, 22 Feb 2023 04:22:16 -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 1pUlKI-0001xz-9X for qemu-devel@nongnu.org; Wed, 22 Feb 2023 04:22:14 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pUlKE-0000DU-Sa for qemu-devel@nongnu.org; Wed, 22 Feb 2023 04:22:14 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=7kBTWBZF89Z1+DP++PIe4ZnjwG1jW5klL+f4SX5A534=; b=FtQD4EenRBylub/FSBHKRGSnEa j8gci/c+At0f78OYXlKuScbP0X9Ir0qozebhJ2B+52kv/kh+Iw2gpLc5JDpTmbkKlZzMHD9Ns8074 Gop9hfTjA1MP+NPPiqp2Fnz9uayNkAl7ZqiMex9KusIriGgNcjK+uTrRzI1wn6l4wG0m3cc2lCrsh Wc/ylMf5fjLmXF3rAqy0m5pHgiWTrfb/LnyXWaaZbYQ5S3Ca9uWtcIT8hQIbN1c4OtXML+MzXJ4Nf xWIXVK7hZzVnGgQIG1e1TcPGds84owKVhw7QiTXopW0+157WicqWREYTlGi5hVlLjNrRVVkTykmpy BMkNjKcg==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pUlK2-00DLR7-Ho; Wed, 22 Feb 2023 09:21:59 +0000 Message-ID: Subject: Re: [PATCH v12 47/60] i386/xen: handle PV timer hypercalls From: David Woodhouse To: Peter Maydell , qemu-devel@nongnu.org Cc: Paolo Bonzini , Paul Durrant , Joao Martins , Ankur Arora , Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , Thomas Huth , Alex =?ISO-8859-1?Q?Benn=E9e?= , Juan Quintela , "Dr . David Alan Gilbert" , Claudio Fontana , Julien Grall , "Michael S. Tsirkin" , Marcel Apfelbaum , armbru@redhat.com, Stefano Stabellini , vikram.garhwal@amd.com Date: Wed, 22 Feb 2023 09:21:57 +0000 In-Reply-To: <20230220204736.2639601-48-dwmw2@infradead.org> References: <20230220204736.2639601-1-dwmw2@infradead.org> <20230220204736.2639601-48-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-zXW93CPzRe7hGywXVXnm" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+d08044c82682f1dc09d1+7122+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list 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 --=-zXW93CPzRe7hGywXVXnm Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-02-20 at 20:47 +0000, David Woodhouse wrote: > @@ -1246,6 +1470,16 @@ static bool do_kvm_xen_handle_exit(X86CPU *cpu, st= ruct kvm_xen_exit *exit) > =C2=A0=C2=A0=C2=A0=C2=A0 } > =C2=A0 > =C2=A0=C2=A0=C2=A0=C2=A0 switch (code) { > +=C2=A0=C2=A0=C2=A0 case __HYPERVISOR_set_timer_op: > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (exit->u.hcall.longmode) { > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 retur= n kvm_xen_hcall_set_timer_op(exit, cpu, > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 exit->u.hcall.params[0]); > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } else { > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* In= 32-bit mode, the 64-bit timer value is in two args. */ > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 uint6= 4_t val =3D ((uint64_t)exit->u.hcall.params[1]) << 32 | > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 (uint32_t)exit->u.hcall.params[0]; > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 retur= n kvm_xen_hcall_set_timer_op(exit, cpu, val); > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } Argh, there I'm returning -errno from a function that ought to set it in exit->u.hcall.result and return 'true' for a handled syscall. Again. Still *slightly* regretting my life choices there and wishing the compiler caught that for me, but not enough to change it because we really *do* want to track which unhandled calls guests are trying to make. I'll fix it and then (if I make load_multiboot() tolerate 64-bit binaries as previously discussed) the XTF tests work: $ ./bkvm/qemu-system-x86_64 -serial mon:stdio -accel kvm,xen-version=3D0x= 4000a,kernel-irqchip=3Dsplit -cpu host -display none -kernel$XTFDIR/tests/s= et_timer_op/test-hvm64-set_timer_op =20 --- Xen Test Framework --- Environment: HVM 64bit (Long mode 4 levels) Test hypercall set_timer_op Test result: SUCCESS ****************************** PANIC: xtf_exit(): hypercall_shutdown(SHUTDOWN_poweroff) returned ****************************** QEMU: Terminated $ ./bkvm/qemu-system-x86_64 -serial mon:stdio -accel kvm,xen-version=3D0x4= 000a,kernel-irqchip=3Dsplit -cpu host -display none -kernel $XTFDIR/tests/s= et_timer_op/test-hvm32-set_timer_op =20 --- Xen Test Framework --- Environment: HVM 32bit (No paging) Test hypercall set_timer_op Test result: SUCCESS ****************************** PANIC: xtf_exit(): hypercall_shutdown(SHUTDOWN_poweroff) returned ****************************** QEMU: Terminated (Dunno why it whines about poweroff; it isn't even calling the hypercall. And the test to explicitly test that hypercall does work.) --- a/target/i386/kvm/xen-emu.c +++ b/target/i386/kvm/xen-emu.c @@ -1118,14 +1118,18 @@ static int vcpuop_stop_singleshot_timer(CPUState *c= s) return 0; } =20 -static int kvm_xen_hcall_set_timer_op(struct kvm_xen_exit *exit, X86CPU *c= pu, - uint64_t timeout) +static bool kvm_xen_hcall_set_timer_op(struct kvm_xen_exit *exit, X86CPU *= cpu, + uint64_t timeout) { + int err; + if (unlikely(timeout =3D=3D 0)) { - return vcpuop_stop_singleshot_timer(CPU(cpu)); + err =3D vcpuop_stop_singleshot_timer(CPU(cpu)); } else { - return do_set_singleshot_timer(CPU(cpu), timeout, false, true); + err =3D do_set_singleshot_timer(CPU(cpu), timeout, false, true); } + exit->u.hcall.result =3D err; + return true; } =20 static bool kvm_xen_hcall_vcpu_op(struct kvm_xen_exit *exit, X86CPU *cpu, --=-zXW93CPzRe7hGywXVXnm Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" 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