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Wed, 9 Dec 2020 20:34:50 +0000 (GMT) From: Matthew Rosato To: cohuck@redhat.com, thuth@redhat.com Subject: [RFC 8/8] s390x/pci: PCILG via the vfio zPCI I/O region Date: Wed, 9 Dec 2020 15:34:26 -0500 Message-Id: <1607546066-2240-9-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 spamscore=0 bulkscore=0 mlxlogscore=999 impostorscore=0 suspectscore=0 phishscore=0 adultscore=0 mlxscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012090143 Received-SPF: pass client-ip=148.163.156.1; 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" For ISM devices, use the vfio region to handle intercepted PCILG instructions. This will allow read I/Os intercepted from the guest to be performed as single operations that ensure the same non-MIO PCI instruction is used on the host as specified in the guest. Signed-off-by: Matthew Rosato --- hw/s390x/s390-pci-inst.c | 3 ++- hw/s390x/s390-pci-vfio.c | 53 ++++++++++++++++++++++++++++++++++++++++ include/hw/s390x/s390-pci-inst.h | 1 + include/hw/s390x/s390-pci-vfio.h | 8 ++++++ 4 files changed, 64 insertions(+), 1 deletion(-) diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c index d4c79f6..33186dc 100644 --- a/hw/s390x/s390-pci-inst.c +++ b/hw/s390x/s390-pci-inst.c @@ -352,7 +352,7 @@ out: * @ptr: a pointer to a uint64_t data field * @len: the length of the valid data, must be 1,2,4 or 8 */ -static int zpci_endian_swap(uint64_t *ptr, uint8_t len) +int zpci_endian_swap(uint64_t *ptr, uint8_t len) { uint64_t data = *ptr; @@ -1392,5 +1392,6 @@ void zpci_assign_default_ops(S390PCIBusDevice *pbdev) void zpci_assign_ops_vfio_io_region(S390PCIBusDevice *pbdev) { + pbdev->ops.pcilg = s390_pci_vfio_pcilg; pbdev->ops.pcistb = s390_pci_vfio_pcistb; } diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c index ad50a62..baba6b0 100644 --- a/hw/s390x/s390-pci-vfio.c +++ b/hw/s390x/s390-pci-vfio.c @@ -337,6 +337,59 @@ int s390_pci_get_zpci_io_region(S390PCIBusDevice *pbdev) return ret; } +int s390_pci_vfio_pcilg(S390PCIBusDevice *pbdev, uint64_t *data, uint8_t pcias, + uint16_t len, uint64_t offset) +{ + struct vfio_region_zpci_io *region = pbdev->io_region; + VFIOPCIDevice *vfio_pci; + int ret; + + if (region == NULL) { + return -EIO; + } + + vfio_pci = container_of(pbdev->pdev, VFIOPCIDevice, pdev); + + /* Perform Length/Alignment checks */ + switch (pcias) { + case ZPCI_IO_BAR_MIN...ZPCI_IO_BAR_MAX: + if (!len || (len > (8 - (offset & 0x7)))) { + return -EINVAL; + } + region->req.gaddr = (uint64_t)data; + region->req.offset = offset; + region->req.len = len; + region->req.pcias = pcias; + region->req.flags = VFIO_ZPCI_IO_FLAG_READ; + + ret = pwrite(vfio_pci->vbasedev.fd, ®ion->req, + sizeof(struct vfio_zpci_io_req), + pbdev->io_region_op_offset); + if (ret != sizeof(struct vfio_zpci_io_req)) { + ret = -EIO; + } else { + ret = 0; + } + break; + case ZPCI_CONFIG_BAR: + if (!len || (len > (4 - (offset & 0x3))) || len == 3) { + return -EINVAL; + } + *data = pci_host_config_read_common( + pbdev->pdev, offset, pci_config_size(pbdev->pdev), len); + + if (zpci_endian_swap(data, len)) { + ret = -EINVAL; + } + ret = 0; + break; + default: + return -EFAULT; + } + + return ret; +} + int s390_pci_vfio_pcistb(S390PCIBusDevice *pbdev, S390CPU *cpu, uint64_t gaddr, uint8_t ar, uint8_t pcias, uint16_t len, uint64_t offset) diff --git a/include/hw/s390x/s390-pci-inst.h b/include/hw/s390x/s390-pci-inst.h index 7ed6175..fe368fb 100644 --- a/include/hw/s390x/s390-pci-inst.h +++ b/include/hw/s390x/s390-pci-inst.h @@ -101,6 +101,7 @@ typedef struct ZpciFib { int pci_dereg_irqs(S390PCIBusDevice *pbdev); void pci_dereg_ioat(S390PCIIOMMU *iommu); int clp_service_call(S390CPU *cpu, uint8_t r2, uintptr_t ra); +int zpci_endian_swap(uint64_t *ptr, uint8_t len); int pcilg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra); int pcistg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra); int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra); diff --git a/include/hw/s390x/s390-pci-vfio.h b/include/hw/s390x/s390-pci-vfio.h index f0a994f..d9fb3a4 100644 --- a/include/hw/s390x/s390-pci-vfio.h +++ b/include/hw/s390x/s390-pci-vfio.h @@ -22,6 +22,8 @@ S390PCIDMACount *s390_pci_start_dma_count(S390pciState *s, void s390_pci_end_dma_count(S390pciState *s, S390PCIDMACount *cnt); void s390_pci_get_clp_info(S390PCIBusDevice *pbdev); int s390_pci_get_zpci_io_region(S390PCIBusDevice *pbdev); +int s390_pci_vfio_pcilg(S390PCIBusDevice *pbdev, uint64_t *data, uint8_t pcias, + uint16_t len, uint64_t offset); int s390_pci_vfio_pcistb(S390PCIBusDevice *pbdev, S390CPU *cpu, uint64_t gaddr, uint8_t ar, uint8_t pcias, uint16_t len, uint64_t offset); @@ -42,6 +44,12 @@ static inline int s390_pci_get_zpci_io_region(S390PCIBusDevice *pbdev) { return -EINVAL; } +static inline int s390_pci_vfio_pcilg(S390PCIBusDevice *pbdev, uint64_t *data, + uint8_t pcias, uint16_t len, + uint64_t offset) +{ + return -EIO; +} static inline int s390_pci_vfio_pcistb(S390PCIBusDevice *pbdev, S390CPU *cpu, uint64_t gaddr, uint8_t ar, uint8_t pcias, uint16_t len,