From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9E6CF39FCBF; Fri, 26 Jun 2026 15:19:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782487182; cv=none; b=CML/ot4aKE6xt6rFsep6mJfFicZt8f0+ByLUAKsHmgj0Bfjhay/HcaGNcekQGDAU9ZgVpl9Lrky/cbWkGPIxtejPGK7IKGCRZxYvp/M9GJtS4pZA6aAfwHJUeYwBqa+dJ7WPoCZCw2x3ETCKd3xw/bw2gsLyblc40S1EGMwF+sI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782487182; c=relaxed/simple; bh=zKs3HEiBrlRHaJcdNgam4Ns38EIP31uY2di/QadeN44=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=NB9xqGZeZ/ybNmuJnw3Nb11PT4+F/dZyMkkZqzfWudD4bhWSnxhRm9aM/Jr3+gy9FTTaKm1t7f9Sdoc0FszqoQrdSEgdjfrT2d8Y5eh1pISMcgHdjJaH+t8ayl5M72XxvK9a7Oko9qTNRB+5u8BqPzSqQfMBdune/DWNo8oKf8M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=JDSZZ++M; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="JDSZZ++M" 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=zKs3HEiBrlRHaJcdNgam4Ns38EIP31uY2di/QadeN44=; b=JDSZZ++MGYiLe32o2Ym6xdhTS2 ds60ZSNrjqYPveJKBzyg8G1qxjzi/9Hko/N5Mpe68akfHi4nNl/BWI63gZIFVY8cXxlyABptWMDOQ WSaCpkDQw+7sTcwI//AIFesSXd+RxqM8SMkSUTymMAbM7igvZsJWseXWZ5760cyJpzOcR7Hg+ousu imTmmlvKG60hTiapWxmNYRFz11fJkfbcO0N8mCdQn7iqfUbkmR+nxACbiY6GyEbKtwjLMO+Dvm8Pw 8xsOb2xmEx8o3wpcTl06xWgZA1d0B7ZZDoT6pbJyTKsifjplBPYJQqs+ZOXFTd+qrNDblq0Rp0I9Q bVyjr6ZA==; Received: from [2001:8b0:10b:5:f3d6:3c0c:6c61:8d10] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wd8L8-0000000C33b-3tbh; Fri, 26 Jun 2026 15:19:35 +0000 Message-ID: <8327be751da5229e3dc320d731dbc3038e1f30b2.camel@infradead.org> Subject: Re: [PATCH v3 04/10] KVM: x86/xen: Punt singleshot timer hcalls to userspace if Xen vCPU ID isn't set From: David Woodhouse To: Sean Christopherson Cc: Vitaly Kuznetsov , Paolo Bonzini , Paul Durrant , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+5b32c49cd8f005e65654@syzkaller.appspotmail.com, syzbot+5d2b94b77112148d1744@syzkaller.appspotmail.com Date: Fri, 26 Jun 2026 16:19:33 +0100 In-Reply-To: References: <20260625223623.3376478-1-seanjc@google.com> <20260625223623.3376478-5-seanjc@google.com> <123bd3932db959a9c26b9ede46632e482dbdc4ab.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-BPI4KWxQwPw853tVz/BK" User-Agent: Evolution 3.60.3-0ubuntu1~ppa6 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-BPI4KWxQwPw853tVz/BK Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2026-06-26 at 07:27 -0700, Sean Christopherson wrote: > =C2=A0 > > > Note, KVM's handling of KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID restricts the = ID to > > > KVM_MAX_VCPUS, so there's no chance of a valid ID colliding with -1u. > >=20 > > Nit: XEN_VCPU_ID_INVALID isn't -1u; it's U32_MAX. > >=20 > > I'd have been slightly happier if you'd used an explicit -1U, perhaps > > with a name of its own (although I guess we wouldn't want to call it > > KVM_VCPU_IDX_INVALID in the *Xen* part). >=20 > Ya, I was 50/50 on having KVM define its own INVALID macro versus reusing= what > the Xen-the-guest has.=C2=A0 I didn't want to open code the literal, beca= use that > would require open coding a somewhat magical value in multiple locations.= =C2=A0 And > having XEN_VCPU_ID_INVALID and KVM_XEN_VCPU_ID_INVALID, with the same val= ue, > seemed even worse than reusing a macro that isn't strictly owned by KVM. >=20 > What if I also add a compile-timer assertion?=C2=A0 In the end, KVM doesn= 't care what > value XEN_VCPU_ID_INVALID uses, so long as it can't colled with what is a= llowed > by KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID. Yeah, that makes sense. It's consistent with the build-time assertions we have elsewhere in the Xen code to document other such things we hold to be true. I'd probably have put it along with the code which *uses* XEN_VCPU_ID_INVALID but I guess it doesn't matter. > diff --git arch/x86/kvm/xen.c arch/x86/kvm/xen.c > index 3ed6686e0a1a..5c60ed9ef2cc 100644 > --- arch/x86/kvm/xen.c > +++ arch/x86/kvm/xen.c > @@ -1103,6 +1103,8 @@ int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, st= ruct kvm_xen_vcpu_attr *data) > =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 break; > =C2=A0 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 case KVM_XEN_VCPU_ATTR_TYPE_VC= PU_ID: > +=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 BUILD_BUG_ON(XEN_VCPU_ID_INVALID < KVM_MAX_VCPUS); > + > =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 if (data->u.vcpu_id >=3D KVM_MAX_VCPUS) > =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 r =3D -E= INVAL; > 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