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 C9C6B2F5A12; Tue, 11 Aug 2026 23:47:57 +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=1786492082; cv=none; b=BmXDPxuyheQXKjZwOX+Xlivf/UpveyvqAX9JHkTqcJW/9/8Y6oYxl1hDeYZJXBd7SWkh9EtxYiO9Ttk+P++TFuEG8CJy32ywwVIc4i+8Sq/Grd37qW90Zz2sfd6qcqcZK636V5iHQap2GVDUqGij8/OSB2daEwzA08wPYbdxj3U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786492082; c=relaxed/simple; bh=oTyIubf2BBwey8C6TGibqWfsS5/hG77w7ENELaochO4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=MtZP2d8Vj7GcFysWeaBosl1010lvavEVMPPVoMAq5JMJ4v00bG9w/67HPUqeE21R0r8TWdtPXP7CY7mpCEW0IgaDKgIrDcqBx2sBLEN6i4emd/2U+pautWgvD41xfkUbycCBmtqq4qjnB6GCcNGLuWqqz1ShOmfHMHXsCENZySo= 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=XHf7dDf0; 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="XHf7dDf0" 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=K9O+zc+iuJrnK7GwdfBAM0RuWn2xcnekJCkifX3QOpQ=; b=XHf7dDf0/CRvkm66ogTBZ8as18 Cc3enQfly/UEz6C91IZBgXDayswWCRoa1OeHOxKdJZ/feBWe3fMgOe30F5aC40AQneFvWWu0fPXXi vik2ha/q+sXY41s6yuEgid6QlDjUeTdAz1mxA5VmBQbcfJRhVIG0AYSo02C7FSh4yknmVdZ+YHqi2 dJCG2tQCpMx032w9m6Nf7YsJMqxxkZx5uj6HOV6jB3N7WgWT4tlM9sEvU7nggEGRnVvmo1rLZ6b9G rfjMADSN+w7/rovSAAcOiRF9dPfHHVA7I8hM+LuxUXtkah9fcmKIkQNgMJPBiSEmTtFstB9Cn6zC5 vUNbgbVA==; Received: from [2001:8b0:10b:5:e09:5b1f:c111:693d] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wtwC6-000000019pW-2dt4; Tue, 11 Aug 2026 23:47:42 +0000 Message-ID: Subject: Re: [PATCH v7 31/36] KVM: x86: Add KVM_[GS]ET_CLOCK_GUEST for accurate KVM clock migration From: David Woodhouse To: Sean Christopherson Cc: Paolo Bonzini , Jonathan Corbet , Shuah Khan , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Vitaly Kuznetsov , Juergen Gross , Boris Ostrovsky , Paul Durrant , Jonathan Cameron , Sascha Bischoff , Marc Zyngier , Joey Gouly , Jack Allister , Dongli Zhang , joe.jin@oracle.com, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, linux-kselftest@vger.kernel.org Date: Wed, 12 Aug 2026 00:47:37 +0100 In-Reply-To: References: <20260728144954.355376-1-dwmw2@infradead.org> <20260728144954.355376-32-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-cOU4kZbVOpr6kbcf3uch" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-doc@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 --=-cOU4kZbVOpr6kbcf3uch Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2026-08-11 at 16:40 -0700, Sean Christopherson wrote: > > + > > + /* > > + * If KVM_REQ_CLOCK_UPDATE is already pending, or if the pvclock > > + * has never been generated at all, call kvm_guest_time_update(). > > + */ > > + if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, v) || !vcpu->hw_tsc_hz) { > > + int idx =3D srcu_read_lock(&v->kvm->srcu); > > + int ret =3D kvm_guest_time_update(v); >=20 > Invoking kvm_guest_time_update() here is probably a deal-breaker.=C2=A0 U= pdating the > master clock and other internal state is far from ideal, but should be ok= . >=20 > However, writing guest memory is not.=C2=A0 Specifically, dirtying memory= after the > last KVM_RUN is a non-starter for many usecases, as is modifying state th= at is > visible via other GET uAPI (though I don't think that applies here?).=C2= =A0 E.g. see > commits: I don't think we need it written to guest memory; we only need to generate the in-kernel shadow which is then written to the guest. I wonder if we can have a boolean 'write_guest' argument to kvm_guest_time_update() .. but ick. Or maybe it's OK to just return -EBUSY. Isn't KVM_REQ_CLOCK_UPDATE a pathological case anyway these day? I'm trying to ignore kvm_set_guest_paused()...=20 I'll take another look in the morning at the whole thing. --=-cOU4kZbVOpr6kbcf3uch Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw DQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAOfSIeC0vv1xPQ+dgSxbIIrkaru6skAWJYaGFzmv q4Kq+2wU2jxhcWlJg/JeP5jEkq/LM3pn5aaLao79j+XRmS7J1ZpJKUODJVoM4s9MQJhTMvo4qS5Z S64g6QR7Obkz3I1Lr3aWeSBmDDEyzue+NKtuWZ1Cxy3RdXo/w5HgRc3l2AercOM3Gt1XonTzEtTb 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