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 65F72C433EF for ; Wed, 2 Mar 2022 21:56:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245441AbiCBV5K (ORCPT ); Wed, 2 Mar 2022 16:57:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37406 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242184AbiCBV5H (ORCPT ); Wed, 2 Mar 2022 16:57:07 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A676E5E157; Wed, 2 Mar 2022 13:56:23 -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=edS5GzHH0bcVqK+FiNzDz26INVSXmlCBiSUqZ6/3t+o=; b=npiX3DNjdbnCtX2/6Pa9VeXfTG fwFdou/0vNfv+Vu4wEkl4d36UXED5RYQXRnxBInVfbxAiC8mxf6B+yfGR8996Ix7zbaSqPfBjufYm 98uzgK3ADi7+BLdV5S2XS3XuwTv8JVPYeah016KOEMI/MeakjfRx7MGtLqCM46gaA12MgFSosloxz XUOSM7dwf6rFxLYIoDaoF0sXxQeDptx3xgQ/qozOIt2LGjjXpJD1P33BxVAXf9/JPOcxaOp4nmcQp 2U5eV+0+e1NrglJ+dTsbaBy3GP6hY+x6K8e4oOmizWDWw5gdrdfbmPnupquKZ00Qj5E2p9S0pL9WC GBB09Ekw==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nPWwp-00B15x-Ap; Wed, 02 Mar 2022 21:55:51 +0000 Message-ID: <7946bff8d8c529f0a2fabc80ca988879ea783b2e.camel@infradead.org> Subject: Re: [PATCH v3 26/28] KVM: selftests: Split out helper to allocate guest mem via memfd From: David Woodhouse To: Paolo Bonzini , Sean Christopherson , Christian Borntraeger , Janosch Frank , Claudio Imbrenda Cc: Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , David Hildenbrand , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, David Matlack , Ben Gardon , Mingwei Zhang Date: Wed, 02 Mar 2022 21:55:50 +0000 In-Reply-To: <764356ef-dd0f-01bd-129c-a821136a4f6e@redhat.com> References: <20220226001546.360188-1-seanjc@google.com> <20220226001546.360188-27-seanjc@google.com> <764356ef-dd0f-01bd-129c-a821136a4f6e@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-n56ZwRzz/m9W0RcnpHU4" 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 --=-n56ZwRzz/m9W0RcnpHU4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2022-03-02 at 19:36 +0100, Paolo Bonzini wrote: > On 3/1/22 00:36, David Woodhouse wrote: > > On Sat, 2022-02-26 at 00:15 +0000, Sean Christopherson wrote: > > > Extract the code for allocating guest memory via memfd out of > > > vm_userspace_mem_region_add() and into a new helper, kvm_memfd_alloc(= ). > > > A future selftest to populate a guest with the maximum amount of gues= t > > > memory will abuse KVM's memslots to alias guest memory regions to a > > > single memfd-backed host region, i.e. needs to back a guest with memf= d > > > memory without a 1:1 association between a memslot and a memfd instan= ce. > > >=20 > > > No functional change intended. > > >=20 > > > Signed-off-by: Sean Christopherson > >=20 > > While we're at it, please can we make the whole thing go away and just > > return failure #ifndef MFD_CLOEXEC, instead of breaking the build on > > older userspace? >=20 > We can just use old school F_SETFD if that's helpful for you. The system on which I had that problem doesn't have memfd at all. As a local hack just to build the TSC test case on a system that actually supports TSC scaling, I just made it all go away thus: --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -938,6 +938,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, =20 region->fd =3D -1; if (backing_src_is_shared(src_type)) { +#ifdef MFD_CLOEXEC int memfd_flags =3D MFD_CLOEXEC; =20 if (src_type =3D=3D VM_MEM_SRC_SHARED_HUGETLB) @@ -954,6 +955,9 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,= 0, region->mmap_size); TEST_ASSERT(ret =3D=3D 0, "fallocate failed, errno: %i", er= rno); +#else + TEST_ASSERT(false, "memfd support not present"); +#endif } =20 region->mmap_start =3D mmap(NULL, region->mmap_size, --=-n56ZwRzz/m9W0RcnpHU4 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 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