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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 52661C433FE for ; Thu, 24 Nov 2022 00:33:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229700AbiKXAdd (ORCPT ); Wed, 23 Nov 2022 19:33:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229536AbiKXAd3 (ORCPT ); Wed, 23 Nov 2022 19:33:29 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B56A5CFA6D; Wed, 23 Nov 2022 16:33:27 -0800 (PST) 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=yFKM2WkaUeRvXwdvDpA048Mku9j52K6QP17nWuOF0OA=; b=D+PVmeMZ3EjOqMlNbANgr097F3 3SqjWtudVH4qzU9dXebac4SAmstrXrWMhkwBgg4YuSFcMsXVBapNOhHGCTd/2A/sE1gWTTbrwfKfN Qj734Fpvpv8Aa81z53bfjaUs0ufOCuSMG+X/oWNQpKO56XfQmbzPVRbCYk29HMMOYbFMTuBcREoT2 SfpAh/oT4n1c/AKLFQpc4xJOeMf6z0idgjGOEqbwF6jwAgemrsea9MdYypgDX/EeFVkbndfoOrW7B 4LlBnGFL/gq6U90Qn+NFa1ZLqcwhc6jdCJKNy8kaFU8pr501/+qnjKJE5cROSP/Q9gUMyVD/EZqyI p+5jTpMg==; Received: from [2001:8b0:10b:5:e35e:4295:9d62:caa0] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1oy0BD-008DmR-D7; Thu, 24 Nov 2022 00:33:27 +0000 Message-ID: <7a19d6c2c86ffd09ecd86ea00375ef48302b7084.camel@infradead.org> Subject: Re: [PATCH v2 1/1] KVM: x86/xen: add support for 32-bit guests in SCHEDOP_poll From: David Woodhouse To: "Kaya, Metin" , Paolo Bonzini , "kvm@vger.kernel.org" Cc: "Durrant, Paul" , Boris Ostrovsky , "linux-kernel@vger.kernel.org" , "x86@kernel.org" Date: Thu, 24 Nov 2022 00:33:19 +0000 In-Reply-To: <1647883644964.29736@amazon.com> References: <1647881191688.60603@amazon.com> ,<1647882914508.15309@amazon.com> <1647883644964.29736@amazon.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-Oafs+Nese90xqTBOfIkV" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-Oafs+Nese90xqTBOfIkV Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2022-03-21 at 17:27 +0000, Kaya, Metin wrote: > From: Metin Kaya >=20 > This patch introduces compat version of struct sched_poll for > SCHEDOP_poll sub-operation of sched_op hypercall, reads correct amount > of data (16 bytes in 32-bit case, 24 bytes otherwise) by using new > compat_sched_poll struct, copies it to sched_poll properly, and lets > rest of the code run as is. >=20 > Signed-off-by: Metin Kaya Could do with a test case. It's fairly simple to flip the 'longmode' config even when the guest is actually in 64-bit mode, so it should be fairly easy to add this in the xen_shinfo_test. Other minor nits below... > --- > arch/x86/kvm/xen.c | 31 +++++++++++++++++++++++++++---- > arch/x86/kvm/xen.h | 7 +++++++ > 2 files changed, 34 insertions(+), 4 deletions(-) >=20 > diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c > index 7d01983d1087..2d0a5d2ca6f1 100644 > --- a/arch/x86/kvm/xen.c > +++ b/arch/x86/kvm/xen.c > @@ -998,20 +998,43 @@ static bool kvm_xen_schedop_poll(struct kvm_vcpu *v= cpu, bool longmode, > evtchn_port_t port, *ports; > gpa_t gpa; > =20 > - if (!longmode || !lapic_in_kernel(vcpu) || > + if (!lapic_in_kernel(vcpu) || > !(vcpu->kvm->arch.xen_hvm_config.flags & KVM_XEN_HVM_CONFIG_EVTCHN_= SEND)) > return false; > =20 > idx =3D srcu_read_lock(&vcpu->kvm->srcu); > gpa =3D kvm_mmu_gva_to_gpa_system(vcpu, param, NULL); > srcu_read_unlock(&vcpu->kvm->srcu, idx); > - > - if (!gpa || kvm_vcpu_read_guest(vcpu, gpa, &sched_poll, > - sizeof(sched_poll))) { > + if (!gpa) { > *r =3D -EFAULT; > return true; > } > =20 > + if (IS_ENABLED(CONFIG_64BIT) && longmode) { Make this 'if (!IS_ENABLED(CONFIG_64BIT || longmode) {' You want to take this trivial path for the 32-bit host kernel too, since struct sched_poll and its compat version are identical there. > + if (kvm_vcpu_read_guest(vcpu, gpa, &sched_poll, > + sizeof(sched_poll))) { > + *r =3D -EFAULT; > + return true; > + } > + } else { Then this code path is only for IS_ENABLED(CONFIG_64BIT) && !longmode, which is what we want. > + struct compat_sched_poll sp; > + > + /* > + * Sanity check that __packed trick works fine and size of > + * compat_sched_poll is 16 bytes just like in the real Xen > + * 32-bit case. > + */ > + BUILD_BUG_ON(sizeof(struct compat_sched_poll) !=3D 16); > + > + if (kvm_vcpu_read_guest(vcpu, gpa, &sp, sizeof(sp))) { > + *r =3D -EFAULT; > + return true; > + } > + sched_poll.ports =3D (evtchn_port_t *)(unsigned long)(sp.ports); > + sched_poll.nr_ports =3D sp.nr_ports; > + sched_poll.timeout =3D sp.timeout; > + } > --- a/arch/x86/kvm/xen.h > +++ b/arch/x86/kvm/xen.h > @@ -196,6 +196,13 @@ struct compat_shared_info { > struct compat_arch_shared_info arch; > }; > =20 > +struct compat_sched_poll { > + /* This is actually a guest virtual address which points to ports. */ > + uint32_t ports; > + unsigned int nr_ports; > + uint64_t timeout; > +} __packed; > + We use __attribute__((packed)) elsewhere in the same file. I don't much care, but consistency is good. 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