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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 51E9CC678D5 for ; Tue, 7 Mar 2023 16:17:14 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pZZzT-0005Yr-9K; Tue, 07 Mar 2023 11:16:39 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pZZzP-0005YW-TQ for qemu-devel@nongnu.org; Tue, 07 Mar 2023 11:16:37 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pZZzM-0005SU-Un for qemu-devel@nongnu.org; Tue, 07 Mar 2023 11:16:35 -0500 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=3ZCf67GpIRVuyIcW88YqOAiLLpuW8e60237wNWVEDts=; b=mUIaWge720r+rqVV7qHF/shzF4 /j5BTpT1mG4d0WsYO8gcUb5OGiOzbGRbE329ATjppPcXgTqLb5omnJL2UZCvKr8SVUTsrjxLd5sdh bmLPQGvgXNvxalsQKdPDAawVBSuEifK+YCK1NN0khVnVMAoTfcmrefGVhTHjbPHpQTcFHplOvP2EU NTkZnlmFgIj1cahHjL8nsvEZPnioBQMZYW6LgyIKfGZb4GQBlv91UBKwRQIXtRDDJko7bq0VM9ibN FGDXcUKHAVrNzYOvL7sXNCWz1MrvGu4kja9vZf6/k2WI6iv4XIuiECaBJcB1z4WoPdyp/N7xMb0uY aB4Wc4hQ==; Received: from [2001:8b0:10b:5:640c:634b:db90:9c87] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pZZyx-006YAm-Tj; Tue, 07 Mar 2023 16:16:08 +0000 Message-ID: Subject: Re: [RFC PATCH v1 21/25] hw/xen: Add emulated implementation of grant table operations From: David Woodhouse To: paul@xen.org, qemu-devel@nongnu.org Cc: Paolo Bonzini , Joao Martins , Ankur Arora , Stefano Stabellini , vikram.garhwal@amd.com, Anthony Perard , xen-devel@lists.xenproject.org Date: Tue, 07 Mar 2023 16:16:06 +0000 In-Reply-To: References: <20230302153435.1170111-1-dwmw2@infradead.org> <20230302153435.1170111-22-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-AQQHNLypwwvIWGFooPru" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+9298a7250c90fe94fbb7+7135+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-AQQHNLypwwvIWGFooPru Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-03-07 at 16:07 +0000, Paul Durrant wrote: > On 02/03/2023 15:34, David Woodhouse wrote: > > From: David Woodhouse > >=20 > > This is limited to mapping a single grant at a time, because under Xen = the > > pages are mapped *contiguously* into qemu's address space, and that's v= ery > > hard to do when those pages actually come from anonymous mappings in qe= mu > > in the first place. > >=20 > > Eventually perhaps we can look at using shared mappings of actual objec= ts > > for system RAM, and then we can make new mappings of the same backing > > store (be it deleted files, shmem, whatever). But for now let's stick t= o > > a page at a time. > >=20 > > Signed-off-by: David Woodhouse > > --- > > =C2=A0 hw/i386/kvm/xen_gnttab.c | 299 +++++++++++++++++++++++++++++++++= +++++- > > =C2=A0 1 file changed, 296 insertions(+), 3 deletions(-) > >=20 > [snip] > > +static uint64_t gnt_ref(XenGnttabState *s, grant_ref_t ref, int prot) > > +{ > > +=C2=A0=C2=A0=C2=A0 uint16_t mask =3D GTF_type_mask | GTF_sub_page; > > +=C2=A0=C2=A0=C2=A0 grant_entry_v1_t gnt, *gnt_p; > > +=C2=A0=C2=A0=C2=A0 int retries =3D 0; > > + > > +=C2=A0=C2=A0=C2=A0 if (ref >=3D s->max_frames * ENTRIES_PER_FRAME_V1 |= | > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 s->map_track[ref] =3D=3D UI= NT8_MAX) { > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return INVALID_GPA; > > +=C2=A0=C2=A0=C2=A0 } > > + > > +=C2=A0=C2=A0=C2=A0 if (prot & PROT_WRITE) { > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 mask |=3D GTF_readonly; > > +=C2=A0=C2=A0=C2=A0 } > > + > > +=C2=A0=C2=A0=C2=A0 gnt_p =3D &s->entries.v1[ref]; > > + > > +=C2=A0=C2=A0=C2=A0 /* > > +=C2=A0=C2=A0=C2=A0=C2=A0 * The guest can legitimately be changing the = GTF_readonly flag. Allow >=20 > I'd call a guest playing with the ref after setting GTF_permit_access a= =20 > buggy guest and not bother with the loop. Didn't we have this argument already when I tried to get you to change your one? :) I argue that it's OK for a guest to *increase* permissions to include write permission, even while a read-only grant may be in progress. And also to *decrease* permissions to take away write permission, even while read-only grants may be in progress. The loop is what Xen does, so let's do it that way. >=20 > > +=C2=A0=C2=A0=C2=A0=C2=A0 * that, but don't let a malicious guest cause= a livelock. > > +=C2=A0=C2=A0=C2=A0=C2=A0 */ > > +=C2=A0=C2=A0=C2=A0 for (retries =3D 0; retries < 5; retries++) { > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 uint16_t new_flags; > > + > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Read the entry before an= atomic operation on its flags */ > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 gnt =3D *(volatile grant_en= try_v1_t *)gnt_p; > > + > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if ((gnt.flags & mask) !=3D= GTF_permit_access || > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 gnt= .domid !=3D DOMID_QEMU) { > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ret= urn INVALID_GPA; > > +=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 new_flags =3D gnt.flags | G= TF_reading; > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (prot & PROT_WRITE) { > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 new= _flags |=3D GTF_writing; > > +=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 (qatomic_cmpxchg(&gnt_p-= >flags, gnt.flags, new_flags) =3D=3D gnt.flags) { >=20 > Xen actually does a cmpxchg on both the flags and the domid. We probably= =20 > ought to fail to set the flags if the guest is playing with the domid > but since we're single-tenant it doesn't *really* matter... just a=20 > nice-to-have. So... Yeah, changing the *domid* while it's active is definitely not an OK thing to do. --=-AQQHNLypwwvIWGFooPru Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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