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Omar Elghoul , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, mjrosato@linux.ibm.com, alifm@linux.ibm.com, farman@linux.ibm.com, gbayer@linux.ibm.com, pasic@linux.ibm.com, alex@shazbot.org, frankja@linux.ibm.com, imbrenda@linux.ibm.com In-Reply-To: <20261103150114.68873-6-oelghoul@linux.ibm.com> References: <20261103150114.68873-1-oelghoul@linux.ibm.com> <20261103150114.68873-6-oelghoul@linux.ibm.com> Autocrypt: addr=schnelle@linux.ibm.com; prefer-encrypt=mutual; keydata=mQINBGHm3M8BEAC+MIQkfoPIAKdjjk84OSQ8erd2OICj98+GdhMQpIjHXn/RJdCZLa58k /ay5x0xIHkWzx1JJOm4Lki7WEzRbYDexQEJP0xUia0U+4Yg7PJL4Dg/W4Ho28dRBROoJjgJSLSHwc 3/1pjpNlSaX/qg3ZM8+/EiSGc7uEPklLYu3gRGxcWV/944HdUyLcnjrZwCn2+gg9ncVJjsimS0ro/ 2wU2RPE4ju6NMBn5Go26sAj1owdYQQv9t0d71CmZS9Bh+2+cLjC7HvyTHKFxVGOznUL+j1a45VrVS 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AW1haW4tMjYxMTAzMDA4MiBTYWx0ZWRfXweuaBvb1OtaO p9QPnezyg/bEd6jDEMv8+A3YptcO4zgsxdj8HO19bS3AhZN6lzD2IMz7NjSWhCizXL3Et1ApFgg Jpkh3G7ykl79Ja5f8UbWTtON7M0/BxhwwwydssW15ak274YVfHP0IWTDJxW4D/vP2yJpQ1T0XgA iNqmf7l6HiXU2KozcaymBIszFWJI8IyZWokvxxqsnhbtj0H4FC0A5m18RWFu0X9/dDnRS3+x7bs 9dui1Er0vYCv9HZmuCcVaHQy+icEZ9Pb8P1vPmPu1d8ysPNC4x1kMavR7ZCcUuaaUVr1B21I7xP OUP9iYewazHJ6ZZkXUWO1xIaOqtQiRBFUwjzqehlsjY9pNVH8cAFu7KpsWI5lGylrq5p3/aYCu4 ImsmpXtTZevEemB25sEJrndpVmpFckwxlMIcvs8mNuglcXXkZkxzVf1zZ4jxTqMAjWsZvseJign QA4GZM7MM14cyxAy0kQ== X-Proofpoint-Spam-Info: AW1haW4tMjYxMTAzMDA4MiBTYWx0ZWRfX1dJlKpb+SyRn KrPCrdEMY/KA+mvfJ5ZULNtpM5zMF3Z6nJe5OLSCVeKOEvJzdcclRbNrdEXgNTULlT89xdPay4G OBnb3nTdE+doQo8/6ab93NCwWmeczQg= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-03_04,2026-11-03_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 impostorscore=0 spamscore=0 malwarescore=0 suspectscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611030082 On Tue, 2026-11-03 at 10:01 -0500, Omar Elghoul wrote: > Introduce new VFIO features for zPCI devices to provide FMB passthrough t= o > userspace. >=20 > Allow the user to enable or disable the FMB using the SET-only feature > VFIO_DEVICE_FEATURE_ZPCI_FMB_ENABLE. Likewise allow the user to read the > latest FMB using the GET-only feature VFIO_DEVICE_FEATURE_ZPCI_FMB_READ > in the case when the FMB is enabled. >=20 > Signed-off-by: Omar Elghoul > Acked-by: Alex Williamson > --- > drivers/vfio/pci/vfio_pci_core.c | 4 ++ > drivers/vfio/pci/vfio_pci_priv.h | 18 +++++++++ > drivers/vfio/pci/vfio_pci_zdev.c | 64 ++++++++++++++++++++++++++++++++ > include/uapi/linux/vfio.h | 30 +++++++++++++++ > 4 files changed, 116 insertions(+) >=20 --- snip --- > + > +int vfio_pci_zdev_feature_fmb_read(struct vfio_pci_core_device *vdev, u3= 2 flags, > + void __user *arg, size_t argsz) > +{ > + struct zpci_dev *zdev; > + struct vfio_device_feature_zpci_fmb_read fmb_read; > + struct zpci_fmb fmb_bounce; > + int ret; > + > + ret =3D vfio_check_feature(flags, argsz, VFIO_DEVICE_FEATURE_GET, sizeo= f(fmb_read)); > + if (ret !=3D 1) > + return ret; > + > + zdev =3D to_zpci(vdev->pdev); > + if (!zdev) > + return -ENODEV; > + > + if (copy_from_user(&fmb_read, arg, sizeof(fmb_read))) > + return -EFAULT; > + if (!fmb_read.data) > + return -EINVAL; > + > + scoped_guard(mutex, &zdev->fmb_lock) { > + if (!zdev->fmb_enabled) > + return -ENOMSG; For those who were also wondering what would happen if the zdev has an FMB length too large for this kernel's version of struct zpci_fmb. In that case zpci_fmb_enable() fails the FMB enablement leaving zdev- >fmb_enabled false and then the check above also covers the memcpy() here even if user-space ignores that the FMB is not enabled. > + memcpy(&fmb_bounce, zdev->fmb, zdev->fmb_length); > + } > + > + if (copy_to_user(u64_to_user_ptr(fmb_read.data), &fmb_bounce, zdev->fmb= _length)) > + return -EFAULT; > + > + return 0; > +} Looks good, looking forward to having function measurement in KVM guests. Reviewed-by: Niklas Schnelle