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 6DB693BB9F8; Fri, 26 Jun 2026 08:05:05 +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=1782461110; cv=none; b=q2yQoKdrTWGlGVtThHyBCIgZkCztFCIrgPs1uKPVZlw5gGHG0BcbFXL7/HnHOpS5zlQ0Kh3D+o8glGZnwDxj9XaAQqJ/M+R2Ab4sVg8IJqHnTm618hsRYDSBugq8wyYPghhWCgW2jKKdKahIJgWIQkngi4cpDT/LqMdC495D/8M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782461110; c=relaxed/simple; bh=L7aTMYE1X2Qr9oZ5P4BPqx+ISf3ALZC0HLvnwog4xz4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=rISlKRR+jtla/YjGlRAnsOGvv8CFzTS2cSHZKASFJKANk/HQBWMgZmlbpDPsEzxQzfqcQLoDuh6nUy3PaPbkw/FT7tUkqhWUVzmRI++S5XiPucM7/Z2eakWXLAZXfyFddmQMsaSLfyOg+Z+BnkVSYFNVcWb0KnpevAz5ljsQTik= 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=PW9AkTGy; 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="PW9AkTGy" 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=CAeUsyedYIR9IfToxIda2dxWQPnvP4514OAg9vqw08Y=; b=PW9AkTGyhxC101ui32X7LJPycd wn9jpHl92OYneaRNVniZl51IqQ+RVqvnFUSAvkLa0jxDjcaijlsO0Inz11FQpy23LKDNZUpKcdsK/ pi3cPidpkxEOViZfyN8+5ntTnMKZm2QGt2PhnFCaXsEeT0nJqoRHW+x/pqx+ZvFYnelJokSTAE9kR VPR+twPf1SlFpdOu2O21FWU8uUY/FK+JD12R9/FYlSlS6HQMcpNGYVqj+7WbVcZBSUMqtM33aAsMb GPsmo24fNbQnDLQonCV8tWd51JC5GdkxUB/5I8eCPuKv29P5zULqovgGDV8U1q7c/lL6rUxdnqxL1 +HgHM08g==; 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 1wd1Yc-0000000BTDo-3VHP; Fri, 26 Jun 2026 08:05:03 +0000 Message-ID: <123bd3932db959a9c26b9ede46632e482dbdc4ab.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 , Vitaly Kuznetsov , Paolo Bonzini , Paul Durrant Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+5b32c49cd8f005e65654@syzkaller.appspotmail.com, syzbot+5d2b94b77112148d1744@syzkaller.appspotmail.com Date: Fri, 26 Jun 2026 09:05:02 +0100 In-Reply-To: <20260625223623.3376478-5-seanjc@google.com> References: <20260625223623.3376478-1-seanjc@google.com> <20260625223623.3376478-5-seanjc@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-tSKYhoy/41trbzcwTFn2" 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 --=-tSKYhoy/41trbzcwTFn2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-06-25 at 15:36 -0700, Sean Christopherson wrote: > Explicitly invalidate KVM's internal Xen vCPU ID during vCPU creation > instead of *trying* to set the Xen ID to the vCPU index by default, and > forward singleshot timer hypercalls to userspace if the VMM hasn't set th= e > Xen ID via KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID.=C2=A0 Using the vCPU's index a= s its > default Xen ID is reasonable in concept, but in practice is horribly flaw= ed > as the index is left as '0' until after vCPU initialization completes, i.= e. > every vCPU gets a Xen ID of '0' by default. >=20 > Forward hypercalls to userspace instead of trying to salvage any kind of > default behavior, as all userspace implementations that support multiple > vCPUs either don't enable the timer, are guaranteed to set Xen ID, or wor= k > only because *all* guests also screw up the singleshot timer hypercalls. > The last scenarios is extremely unlikely given that Linux-as-a-guest uses > the actual Xen vCPU ID when making timer hypercalls.=C2=A0 In other words= , for > all intents and purposes, KVM's ABI is already that userspace must set th= e > Xen vCPU ID, so just commit to that ABI. >=20 > Note, KVM's handling of KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID restricts the ID t= o > KVM_MAX_VCPUS, so there's no chance of a valid ID colliding with -1u. Nit: XEN_VCPU_ID_INVALID isn't -1u; it's U32_MAX. 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). But this works. Reviewed-by: David Woodhouse I'd have put this *after* your patch 5 though (qv). > Link: https://lore.kernel.org/all/20260612233017.1F9771F000E9@smtp.kernel= .org > Suggested-by: David Woodhouse > Signed-off-by: Sean Christopherson > --- > =C2=A0arch/x86/kvm/xen.c | 6 +++++- > =C2=A01 file changed, 5 insertions(+), 1 deletion(-) >=20 > diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c > index 694b31c1fcc9..27c1aeeab8af 100644 > --- a/arch/x86/kvm/xen.c > +++ b/arch/x86/kvm/xen.c > @@ -22,6 +22,7 @@ > =C2=A0#include > =C2=A0#include > =C2=A0#include > +#include > =C2=A0 > =C2=A0#include > =C2=A0#include > @@ -1610,6 +1611,9 @@ static bool kvm_xen_hcall_vcpu_op(struct kvm_vcpu *= vcpu, bool longmode, int cmd, > =C2=A0 if (!kvm_xen_timer_enabled(vcpu)) > =C2=A0 return false; > =C2=A0 > + if (vcpu->arch.xen.vcpu_id =3D=3D XEN_VCPU_ID_INVALID) > + return false; > + > =C2=A0 switch (cmd) { > =C2=A0 case VCPUOP_set_singleshot_timer: > =C2=A0 if (vcpu->arch.xen.vcpu_id !=3D vcpu_id) { > @@ -2299,7 +2303,7 @@ static bool kvm_xen_hcall_evtchn_send(struct kvm_vc= pu *vcpu, u64 param, u64 *r) > =C2=A0 > =C2=A0void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu) > =C2=A0{ > - vcpu->arch.xen.vcpu_id =3D vcpu->vcpu_idx; > + vcpu->arch.xen.vcpu_id =3D XEN_VCPU_ID_INVALID; > =C2=A0 vcpu->arch.xen.poll_evtchn =3D 0; > =C2=A0 > =C2=A0 timer_setup(&vcpu->arch.xen.poll_timer, cancel_evtchn_poll, 0); --=-tSKYhoy/41trbzcwTFn2 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv 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