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 F3519360ED8; Mon, 1 Jun 2026 22:09:31 +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=1780351773; cv=none; b=GpEAqfaWoMn1hCdlDOlDxY4pOthRPMpi0dggy5tdMr0iX8K1td/u4DE5DyoxCLt6KvcpkodXyN/aLJISWWuhWN9Oa4QHPHNvQeV+PycZDHstA5ATZzo7x9y8D9rso31G4uqVkajMY8RO/lUZApf2xW8ttw7q0cMuFZC9RsgNp3A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780351773; c=relaxed/simple; bh=valxpF1vicvZne5zXfjuSg93e+yl1jemMPTmNkUSzxE=; h=Message-ID:Subject:From:To:Cc:Date:in-reply-to:Content-Type: MIME-Version; b=eRda6/f4v6G7/qfafHqIPQ9yXLz61skOJEdQM6VXh/5f+WaVNXugjZ1UqewLBAu5K9/o5cEl5vZkpe3yY0JIFUL//DUSymGOwR5gAMGa+pGs2Y2zy4t5rhfmcxvWIGsTHLyg/HTbzsYTO2YIGvGkJsuA0DlssEAhXALMTEI0BLA= 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=d6ToEm4S; 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="d6ToEm4S" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:in-reply-to: Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:References; bh=bK+deqYMHh6dIwA6v3B9GBiH7GVvQc5d18CuIzhNf5A=; b=d6ToEm4S5gSgWkLTTivvk/zDM4 YoLrodhcWCccDjSdtjWsDh5umRUptOVmOo1dVOIqtu1hu8vmc8avULFBSto8qjktEgz6eCc1FLMYv ewDkRjCqbe05kiRR7cGBWhkPB9CrVjpHHd3QU5jnpmMgMkxewz0Dh76O4JMXx13rPLoP30Ym9b/Ll m5YUuEfXzNpohVIM8zXkidLM1g+pvUOJvTmR5JZwI+Jrdb35JoXteg5WUPH6fvkukvay7bzNbNktm vObij1z2uJrN5U0ugbRM7dBbi70Qi6JSoWlzs/cwjsioM0s4ZgEKSHnURns+z+EfgUzrDDtsfa4xr 0UsxiUGA==; Received: from [2001:8b0:10b:5:5b40:b57d:669c:36f4] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wUAoz-00000000qcM-01rU; Mon, 01 Jun 2026 22:09:21 +0000 Message-ID: <0518969877d6f6ab74e2b84e86b3a41671d2a405.camel@infradead.org> Subject: Re: [PATCH v4 31/47] x86/vmware: NOP-ify save/restore hooks when using VMware's sched_clock From: David Woodhouse To: seanjc@google.com Cc: pbonzini@redhat.com, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, kas@kernel.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, ajay.kaher@broadcom.com, alexey.makhalov@broadcom.com, jan.kiszka@siemens.com, luto@kernel.org, peterz@infradead.org, jgross@suse.com, daniel.lezcano@kernel.org, jstultz@google.com, hpa@zytor.com, rick.p.edgecombe@intel.com, vkuznets@redhat.com, bcm-kernel-feedback-list@broadcom.com, boris.ostrovsky@oracle.com, sboyd@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, xen-devel@lists.xenproject.org, dwmw@amazon.co.uk, thomas.lendacky@amd.com, nikunj@amd.com, dwmw2@infradead.org, mhklinux@outlook.com, tglx@linutronix.de Date: Mon, 01 Jun 2026 23:09:20 +0100 in-reply-to: <20260529150753.714296-1-seanjc@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-cGAALZ5GoBDdaEtrbV44" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev 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 --=-cGAALZ5GoBDdaEtrbV44 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 29 May 2026 08:07:52 -0700, Sean Christopherson wrote: > NOP-ify the sched_clock save/restore hooks when using VMware's version of > sched_clock. This will allow extending paravirt_set_sched_clock() to set > the save/restore hooks, without having to simultaneously change the > behavior of VMware guests. > > Note, it's not at all obvious that it's safe/correct for VMware guests to > do nothing on suspend/resume, but that's a pre-existing problem. Leave i= t > for a VMware expert to sort out. > > Signed-off-by: Sean Christopherson Reviewed-by: David Woodhouse --=-cGAALZ5GoBDdaEtrbV44 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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