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Tue, 9 Jan 2024 19:38:05 GMT Received: from hu-eberman-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Tue, 9 Jan 2024 11:38:04 -0800 From: Elliot Berman Date: Tue, 9 Jan 2024 11:38:02 -0800 Subject: [PATCH v16 24/34] virt: gunyah: Share guest VM dtb configuration to Gunyah MIME-Version: 1.0 Message-ID: <20240109-gunyah-v16-24-634904bf4ce9@quicinc.com> References: <20240109-gunyah-v16-0-634904bf4ce9@quicinc.com> In-Reply-To: <20240109-gunyah-v16-0-634904bf4ce9@quicinc.com> To: Alex Elder , Srinivas Kandagatla , Murali Nalajal , Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Philip Derrin , Prakruthi Deepak Heragu , Jonathan Corbet , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Will Deacon , Konrad Dybcio , Bjorn Andersson , Dmitry Baryshkov , "Fuad Tabba" , Sean Christopherson , "Andrew Morton" CC: , , , , , , Elliot Berman X-Mailer: b4 0.13-dev X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: vUg_t-T6NwaXapDllJE2l2cgFSriSpBt X-Proofpoint-GUID: vUg_t-T6NwaXapDllJE2l2cgFSriSpBt X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-09_01,2023-12-07_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 bulkscore=0 malwarescore=0 suspectscore=0 mlxlogscore=999 clxscore=1015 priorityscore=1501 adultscore=0 impostorscore=0 phishscore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2311290000 definitions=main-2401090158 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240109_113817_661550_B65C34CD X-CRM114-Status: GOOD ( 23.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Gunyah Resource Manager sets up a virtual machine based on a device tree which lives in guest memory. Resource manager requires this memory to be provided as a memory parcel for it to read and manipulate. Construct a memory parcel, lend it to the virtual machine, and inform resource manager about the device tree location (the memory parcel ID and offset into the memory parcel). Signed-off-by: Elliot Berman --- drivers/virt/gunyah/vm_mgr.c | 49 ++++++++++++++++++++++++++++++++++++++++++-- drivers/virt/gunyah/vm_mgr.h | 13 +++++++++++- include/uapi/linux/gunyah.h | 14 +++++++++++++ 3 files changed, 73 insertions(+), 3 deletions(-) diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c index be2061aa0a06..4379b5ba151e 100644 --- a/drivers/virt/gunyah/vm_mgr.c +++ b/drivers/virt/gunyah/vm_mgr.c @@ -445,8 +445,27 @@ static int gunyah_vm_start(struct gunyah_vm *ghvm) ghvm->vmid = ret; ghvm->vm_status = GUNYAH_RM_VM_STATUS_LOAD; - ret = gunyah_rm_vm_configure(ghvm->rm, ghvm->vmid, ghvm->auth, 0, 0, 0, - 0, 0); + ghvm->dtb.parcel_start = ghvm->dtb.config.guest_phys_addr >> PAGE_SHIFT; + ghvm->dtb.parcel_pages = ghvm->dtb.config.size >> PAGE_SHIFT; + /* RM requires the DTB parcel to be lent to guard against malicious + * modifications while starting VM. Force it so. + */ + ghvm->dtb.parcel.n_acl_entries = 1; + ret = gunyah_gmem_share_parcel(ghvm, &ghvm->dtb.parcel, + &ghvm->dtb.parcel_start, + &ghvm->dtb.parcel_pages); + if (ret) { + dev_warn(ghvm->parent, + "Failed to allocate parcel for DTB: %d\n", ret); + goto err; + } + + ret = gunyah_rm_vm_configure(ghvm->rm, ghvm->vmid, ghvm->auth, + ghvm->dtb.parcel.mem_handle, 0, 0, + ghvm->dtb.config.guest_phys_addr - + (ghvm->dtb.parcel_start + << PAGE_SHIFT), + ghvm->dtb.config.size); if (ret) { dev_warn(ghvm->parent, "Failed to configure VM: %d\n", ret); goto err; @@ -485,6 +504,8 @@ static int gunyah_vm_start(struct gunyah_vm *ghvm) goto err; } + WARN_ON(gunyah_vm_parcel_to_paged(ghvm, &ghvm->dtb.parcel, ghvm->dtb.parcel_start, ghvm->dtb.parcel_pages)); + ghvm->vm_status = GUNYAH_RM_VM_STATUS_RUNNING; up_write(&ghvm->status_lock); return ret; @@ -531,6 +552,21 @@ static long gunyah_vm_ioctl(struct file *filp, unsigned int cmd, long r; switch (cmd) { + case GUNYAH_VM_SET_DTB_CONFIG: { + struct gunyah_vm_dtb_config dtb_config; + + if (copy_from_user(&dtb_config, argp, sizeof(dtb_config))) + return -EFAULT; + + if (overflows_type(dtb_config.guest_phys_addr + dtb_config.size, + u64)) + return -EOVERFLOW; + + ghvm->dtb.config = dtb_config; + + r = 0; + break; + } case GUNYAH_VM_START: { r = gunyah_vm_ensure_started(ghvm); break; @@ -589,6 +625,15 @@ static void _gunyah_vm_put(struct kref *kref) if (ghvm->vm_status == GUNYAH_RM_VM_STATUS_RUNNING) gunyah_vm_stop(ghvm); + if (ghvm->vm_status == GUNYAH_RM_VM_STATUS_LOAD) { + ret = gunyah_gmem_reclaim_parcel(ghvm, &ghvm->dtb.parcel, + ghvm->dtb.parcel_start, + ghvm->dtb.parcel_pages); + if (ret) + dev_err(ghvm->parent, + "Failed to reclaim DTB parcel: %d\n", ret); + } + gunyah_vm_remove_functions(ghvm); down_write(&ghvm->bindings_lock); diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h index a79c11f1c3a5..b2ab2f1bda3a 100644 --- a/drivers/virt/gunyah/vm_mgr.h +++ b/drivers/virt/gunyah/vm_mgr.h @@ -72,6 +72,13 @@ long gunyah_dev_vm_mgr_ioctl(struct gunyah_rm *rm, unsigned int cmd, * @resource_tickets: List of &struct gunyah_vm_resource_ticket * @auth: Authentication mechanism to be used by resource manager when * launching the VM + * @dtb: For tracking dtb configuration when launching the VM + * @dtb.config: Location of the DTB in the guest memory + * @dtb.parcel_start: Guest frame number where the memory parcel that we lent to + * VM (DTB could start in middle of folio; we lend entire + * folio; parcel_start is start of the folio) + * @dtb.parcel_pages: Number of pages lent for the memory parcel + * @dtb.parcel: Data for resource manager to lend the parcel * * Members are grouped by hot path. */ @@ -101,7 +108,11 @@ struct gunyah_vm { struct device *parent; enum gunyah_rm_vm_auth_mechanism auth; - + struct { + struct gunyah_vm_dtb_config config; + u64 parcel_start, parcel_pages; + struct gunyah_rm_mem_parcel parcel; + } dtb; }; int gunyah_vm_parcel_to_paged(struct gunyah_vm *ghvm, diff --git a/include/uapi/linux/gunyah.h b/include/uapi/linux/gunyah.h index 1af4c5ae6bc3..a89d9bedf3e5 100644 --- a/include/uapi/linux/gunyah.h +++ b/include/uapi/linux/gunyah.h @@ -42,6 +42,20 @@ struct gunyah_create_mem_args { /* * ioctls for gunyah-vm fds (returned by GUNYAH_CREATE_VM) */ + +/** + * struct gunyah_vm_dtb_config - Set the location of the VM's devicetree blob + * @guest_phys_addr: Address of the VM's devicetree in guest memory. + * @size: Maximum size of the devicetree including space for overlays. + * Resource manager applies an overlay to the DTB and dtb_size should + * include room for the overlay. A page of memory is typicaly plenty. + */ +struct gunyah_vm_dtb_config { + __u64 guest_phys_addr; + __u64 size; +}; +#define GUNYAH_VM_SET_DTB_CONFIG _IOW(GUNYAH_IOCTL_TYPE, 0x2, struct gunyah_vm_dtb_config) + #define GUNYAH_VM_START _IO(GUNYAH_IOCTL_TYPE, 0x3) /**