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Wed, 9 Dec 2020 20:34:45 +0000 (GMT) From: Matthew Rosato To: cohuck@redhat.com, thuth@redhat.com Subject: [RFC 6/8] s390x/pci: Handle devices that support relaxed alignment Date: Wed, 9 Dec 2020 15:34:24 -0500 Message-Id: <1607546066-2240-7-git-send-email-mjrosato@linux.ibm.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1607546066-2240-1-git-send-email-mjrosato@linux.ibm.com> References: <1607546066-2240-1-git-send-email-mjrosato@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343, 18.0.737 definitions=2020-12-09_16:2020-12-09, 2020-12-09 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 phishscore=0 priorityscore=1501 spamscore=0 malwarescore=0 lowpriorityscore=0 adultscore=0 mlxlogscore=999 clxscore=1015 impostorscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012090140 Received-SPF: pass client-ip=148.163.158.5; envelope-from=mjrosato@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pmorel@linux.ibm.com, david@redhat.com, schnelle@linux.ibm.com, richard.henderson@linaro.org, qemu-s390x@nongnu.org, qemu-devel@nongnu.org, pasic@linux.ibm.com, borntraeger@de.ibm.com, alex.williamson@redhat.com, mst@redhat.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Certain zPCI device types (e.g. ISM) allow for a different set of address alignment rules for PCISTB instructions. Recognize this distinction and perform only a subset of alignment checks for intercepted PCISTB instructions. Signed-off-by: Matthew Rosato --- hw/s390x/s390-pci-inst.c | 34 ++++++++++++++++++++-------------- hw/s390x/s390-pci-vfio.c | 3 +++ include/hw/s390x/s390-pci-clp.h | 1 + 3 files changed, 24 insertions(+), 14 deletions(-) diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c index a5270d0..30698e5 100644 --- a/hw/s390x/s390-pci-inst.c +++ b/hw/s390x/s390-pci-inst.c @@ -868,25 +868,31 @@ int pcistb_service_call(S390CPU *cpu, uint8_t r1, uint8_t r3, uint64_t gaddr, return 0; } - /* Verify the address, offset and length */ - /* offset must be a multiple of 8 */ - if (offset % 8) { - goto specification_error; - } - /* Length must be greater than 8, a multiple of 8 */ - /* and not greater than maxstbl */ - if ((len <= 8) || (len % 8) || - (len > pbdev->pci_group->zpci_group.maxstbl)) { - goto specification_error; + /* + * If the specified device supports relaxed alignment, some checks can + * be skipped. + */ + if (!(pbdev->pci_group->zpci_group.fr & CLP_RSP_QPCIG_MASK_RELAXED)) { + /* Verify the address, offset and length */ + /* offset must be a multiple of 8 */ + if (offset % 8) { + goto specification_error; + } + /* Length must be greater than 8, a multiple of 8 */ + /* and not greater than maxstbl */ + if ((len <= 8) || (len % 8) || + (len > pbdev->pci_group->zpci_group.maxstbl)) { + goto specification_error; + } + /* Guest address must be double word aligned */ + if (gaddr & 0x07UL) { + goto specification_error; + } } /* Do not cross a 4K-byte boundary */ if (((offset & 0xfff) + len) > 0x1000) { goto specification_error; } - /* Guest address must be double word aligned */ - if (gaddr & 0x07UL) { - goto specification_error; - } ret = pbdev->ops.pcistb(pbdev, cpu, gaddr, ar, pcias, len, offset); diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c index 9296e1b..9439fe1 100644 --- a/hw/s390x/s390-pci-vfio.c +++ b/hw/s390x/s390-pci-vfio.c @@ -156,6 +156,9 @@ static void s390_pci_read_group(S390PCIBusDevice *pbdev, if (cap->flags & VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH) { resgrp->fr = 1; } + if (cap->flags & VFIO_DEVICE_INFO_ZPCI_FLAG_RELAXED) { + resgrp->fr |= CLP_RSP_QPCIG_MASK_RELAXED; + } resgrp->dasm = cap->dasm; resgrp->msia = cap->msi_addr; resgrp->mui = cap->mui; diff --git a/include/hw/s390x/s390-pci-clp.h b/include/hw/s390x/s390-pci-clp.h index 96b8e3f..73a28a0 100644 --- a/include/hw/s390x/s390-pci-clp.h +++ b/include/hw/s390x/s390-pci-clp.h @@ -158,6 +158,7 @@ typedef struct ClpRspQueryPciGrp { #define CLP_RSP_QPCIG_MASK_NOI 0xfff uint16_t i; uint8_t version; +#define CLP_RSP_QPCIG_MASK_RELAXED 0x8 #define CLP_RSP_QPCIG_MASK_FRAME 0x2 #define CLP_RSP_QPCIG_MASK_REFRESH 0x1 uint8_t fr;