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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 12 Sep 2019 13:02:34 +0100 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x8CC2XSN38469942 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 12 Sep 2019 12:02:33 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B8AB4AE9DF; Thu, 12 Sep 2019 11:36:50 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5C3C7AE9D8; Thu, 12 Sep 2019 11:36:49 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.92.148]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 12 Sep 2019 11:36:49 +0000 (GMT) Subject: Re: [PATCH 05/13] KVM: Refactor error handling for setting memory region To: Sean Christopherson , James Hogan , Paul Mackerras , Christian Borntraeger , Paolo Bonzini , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Marc Zyngier References: <20190911185038.24341-1-sean.j.christopherson@intel.com> <20190911185038.24341-6-sean.j.christopherson@intel.com> From: Janosch Frank Openpgp: preference=signencrypt Autocrypt: addr=frankja@linux.ibm.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190911185038.24341-6-sean.j.christopherson@intel.com> X-TM-AS-GCONF: 00 x-cbid: 19091212-0016-0000-0000-000002AA674A X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19091212-0017-0000-0000-0000330AF860 Message-Id: <9773a72d-2a58-fbb1-ed2b-82af0bb5f49a@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-09-12_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=939 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909120129 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190912_050247_366175_71A7EB2E X-CRM114-Status: GOOD ( 31.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Julien Thierry , Wanpeng Li , kvm@vger.kernel.org, David Hildenbrand , Joerg Roedel , Cornelia Huck , linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org, linux-kernel@vger.kernel.org, James Morse , linux-arm-kernel@lists.infradead.org, Vitaly Kuznetsov , kvmarm@lists.cs.columbia.edu, Suzuki K Pouloze , Jim Mattson Content-Type: multipart/mixed; boundary="===============6498452572134257593==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============6498452572134257593== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Bm0JecVlrjrc0FKCyusctXhutbwL6ZTpe" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --Bm0JecVlrjrc0FKCyusctXhutbwL6ZTpe Content-Type: multipart/mixed; boundary="6J8eeynfSebyZsyGavbEUWKxUSMvfibQv"; protected-headers="v1" From: Janosch Frank To: Sean Christopherson , James Hogan , Paul Mackerras , Christian Borntraeger , Paolo Bonzini , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Marc Zyngier Cc: David Hildenbrand , Cornelia Huck , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , James Morse , Julien Thierry , Suzuki K Pouloze , linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org Message-ID: <9773a72d-2a58-fbb1-ed2b-82af0bb5f49a@linux.ibm.com> Subject: Re: [PATCH 05/13] KVM: Refactor error handling for setting memory region References: <20190911185038.24341-1-sean.j.christopherson@intel.com> <20190911185038.24341-6-sean.j.christopherson@intel.com> In-Reply-To: <20190911185038.24341-6-sean.j.christopherson@intel.com> --6J8eeynfSebyZsyGavbEUWKxUSMvfibQv Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 9/11/19 8:50 PM, Sean Christopherson wrote: > Replace a big pile o' gotos with returns to make it more obvious what > error code is being returned, and to prepare for refactoring the > functional, i.e. post-checks, portion of __kvm_set_memory_region(). >=20 > Signed-off-by: Sean Christopherson Definitely necessary Reviewed-by: Janosch Frank > --- > virt/kvm/kvm_main.c | 40 ++++++++++++++++++---------------------- > 1 file changed, 18 insertions(+), 22 deletions(-) >=20 > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index ea8f2f37096f..8306ce3345a6 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -929,34 +929,33 @@ int __kvm_set_memory_region(struct kvm *kvm, > =20 > r =3D check_memory_region_flags(mem); > if (r) > - goto out; > + return r; > =20 > - r =3D -EINVAL; > as_id =3D mem->slot >> 16; > id =3D (u16)mem->slot; > =20 > /* General sanity checks */ > if (mem->memory_size & (PAGE_SIZE - 1)) > - goto out; > + return -EINVAL; > if (mem->guest_phys_addr & (PAGE_SIZE - 1)) > - goto out; > + return -EINVAL; > /* We can read the guest memory with __xxx_user() later on. */ > if ((id < KVM_USER_MEM_SLOTS) && > ((mem->userspace_addr & (PAGE_SIZE - 1)) || > !access_ok((void __user *)(unsigned long)mem->userspace_addr, > mem->memory_size))) > - goto out; > + return -EINVAL; > if (as_id >=3D KVM_ADDRESS_SPACE_NUM || id >=3D KVM_MEM_SLOTS_NUM) > - goto out; > + return -EINVAL; > if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) > - goto out; > + return -EINVAL; > =20 > slot =3D id_to_memslot(__kvm_memslots(kvm, as_id), id); > base_gfn =3D mem->guest_phys_addr >> PAGE_SHIFT; > npages =3D mem->memory_size >> PAGE_SHIFT; > =20 > if (npages > KVM_MEM_MAX_NR_PAGES) > - goto out; > + return -EINVAL; > =20 > new =3D old =3D *slot; > =20 > @@ -973,20 +972,18 @@ int __kvm_set_memory_region(struct kvm *kvm, > if ((new.userspace_addr !=3D old.userspace_addr) || > (npages !=3D old.npages) || > ((new.flags ^ old.flags) & KVM_MEM_READONLY)) > - goto out; > + return -EINVAL; > =20 > if (base_gfn !=3D old.base_gfn) > change =3D KVM_MR_MOVE; > else if (new.flags !=3D old.flags) > change =3D KVM_MR_FLAGS_ONLY; > - else { /* Nothing to change. */ > - r =3D 0; > - goto out; > - } > + else /* Nothing to change. */ > + return 0; > } > } else { > if (!old.npages) > - goto out; > + return -EINVAL; > =20 > change =3D KVM_MR_DELETE; > new.base_gfn =3D 0; > @@ -995,29 +992,29 @@ int __kvm_set_memory_region(struct kvm *kvm, > =20 > if ((change =3D=3D KVM_MR_CREATE) || (change =3D=3D KVM_MR_MOVE)) { > /* Check for overlaps */ > - r =3D -EEXIST; > kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { > if (slot->id =3D=3D id) > continue; > if (!((base_gfn + npages <=3D slot->base_gfn) || > (base_gfn >=3D slot->base_gfn + slot->npages))) > - goto out; > + return -EEXIST; > } > } > =20 > - r =3D -ENOMEM; > - > /* Allocate/free page dirty bitmap as needed */ > if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) > new.dirty_bitmap =3D NULL; > else if (!new.dirty_bitmap) { > - if (kvm_create_dirty_bitmap(&new) < 0) > - goto out; > + r =3D kvm_create_dirty_bitmap(&new); > + if (r) > + return r; > } > =20 > slots =3D kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT); > - if (!slots) > + if (!slots) { > + r =3D -ENOMEM; > goto out_bitmap; > + } > memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)= ); > =20 > if ((change =3D=3D KVM_MR_DELETE) || (change =3D=3D KVM_MR_MOVE)) { > @@ -1068,7 +1065,6 @@ int __kvm_set_memory_region(struct kvm *kvm, > out_bitmap: > if (new.dirty_bitmap && !old.dirty_bitmap) > kvm_destroy_dirty_bitmap(&new); > -out: > return r; > } > EXPORT_SYMBOL_GPL(__kvm_set_memory_region); >=20 --6J8eeynfSebyZsyGavbEUWKxUSMvfibQv-- --Bm0JecVlrjrc0FKCyusctXhutbwL6ZTpe Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEwGNS88vfc9+v45Yq41TmuOI4ufgFAl16LdAACgkQ41TmuOI4 ufiqdRAAk7Fq5LoAJLqJFxnCihIQRlcl8vo542WY/o9SIjSW82ULb9ja3jx/IZOo zXJt4+l9ZwKB3cwu3Z9pkvcu+D7PgbVSHyCAraimR8rk/TznU4esmSGNZX//BmaX AfSdajjNFNRXP+HsOlR0OVsvX6JBWQqfikSvqUv+GGzhOOB5TT7QIlNGTUFJhTuj DWsP4KnnRlxI8a6Tz0mXfcJLDABMu2Ypl8IjtEkAS57byfjVuy1fP3/WtiWW8QST 2BeoiY5FQH/syqW0oXYO6Ov2rlS2gKMPwaL5nQwuHrOxd+A1qZv9rX7NU1P3+eZq +Xutlm/mQHajvO6FfiuUf2pG/YuwfCyhX/ENMcmohw5TO1sdZDcY/BSHop0UYv+F 8RkUxxstxRot67kTQvjZ1p60Tz/SYmxszldFM2noNPjzitbwUoiHrLl9Ti1MeMJ3 QXb1ZCuTA8/F138tNGVL52JIOrsbIqvdLoc1/4qxJPLYbHzF/HMSqJ0nHl8tFa5Y D9N8xdr1pdQoHKNVLDVI8b5Jt5yMaeN4WrBqOFxTVme6XCxGu2eNRxyNWZbA2+Z3 nDkoU2HaEDH3QbH2LuZy9wDTHlPb1dnO3XatbDqCf32/gsChlKjuEcKOcNnBVntM Izb7sxZStgMuHCrkgWweUjFkyR93+8JboW1iJKcFYtR1FWfffyU= =pPrb -----END PGP SIGNATURE----- --Bm0JecVlrjrc0FKCyusctXhutbwL6ZTpe-- --===============6498452572134257593== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============6498452572134257593==--