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Thu, 22 Feb 2024 15:16:45 -0800 From: Elliot Berman Date: Thu, 22 Feb 2024 15:16:56 -0800 Subject: [PATCH v17 33/35] virt: gunyah: Add IO handlers MIME-Version: 1.0 Message-ID: <20240222-gunyah-v17-33-1e9da6763d38@quicinc.com> References: <20240222-gunyah-v17-0-1e9da6763d38@quicinc.com> In-Reply-To: <20240222-gunyah-v17-0-1e9da6763d38@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 0.12.4 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-GUID: _RzcJvsLBoQGikWouASJqOQmU4qKmExK X-Proofpoint-ORIG-GUID: _RzcJvsLBoQGikWouASJqOQmU4qKmExK X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-22_15,2024-02-22_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 adultscore=0 mlxlogscore=999 clxscore=1015 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2402120000 definitions=main-2402220179 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240222_231702_648479_F461E340 X-CRM114-Status: GOOD ( 24.39 ) 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 Add framework for VM functions to handle stage-2 write faults from Gunyah guest virtual machines. IO handlers have a range of addresses which they apply to. Optionally, they may apply to only when the value written matches the IO handler's value. Reviewed-by: Alex Elder Co-developed-by: Prakruthi Deepak Heragu Signed-off-by: Prakruthi Deepak Heragu Signed-off-by: Elliot Berman --- drivers/virt/gunyah/gunyah_vcpu.c | 4 ++ drivers/virt/gunyah/vm_mgr.c | 115 ++++++++++++++++++++++++++++++++++++++ drivers/virt/gunyah/vm_mgr.h | 8 +++ include/linux/gunyah.h | 29 ++++++++++ 4 files changed, 156 insertions(+) diff --git a/drivers/virt/gunyah/gunyah_vcpu.c b/drivers/virt/gunyah/gunyah_vcpu.c index f8306620b1dd6..ef78503fe586d 100644 --- a/drivers/virt/gunyah/gunyah_vcpu.c +++ b/drivers/virt/gunyah/gunyah_vcpu.c @@ -133,6 +133,10 @@ gunyah_handle_mmio(struct gunyah_vcpu *vcpu, unsigned long resume_data[3], vcpu->state = GUNYAH_VCPU_RUN_STATE_MMIO_READ; vcpu->mmio_read_len = len; } else { /* GUNYAH_VCPU_ADDRSPACE_VMMIO_WRITE */ + if (!gunyah_vm_mmio_write(vcpu->ghvm, addr, len, data)) { + resume_data[0] = GUNYAH_ADDRSPACE_VMMIO_ACTION_EMULATE; + return true; + } vcpu->vcpu_run->mmio.is_write = 1; memcpy(vcpu->vcpu_run->mmio.data, &data, len); vcpu->state = GUNYAH_VCPU_RUN_STATE_MMIO_WRITE; diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c index a61a3f3ae92f1..2434be5dffe08 100644 --- a/drivers/virt/gunyah/vm_mgr.c +++ b/drivers/virt/gunyah/vm_mgr.c @@ -302,6 +302,118 @@ static void gunyah_vm_clean_resources(struct gunyah_vm *ghvm) mutex_unlock(&ghvm->resources_lock); } +static int _gunyah_vm_io_handler_compare(const struct rb_node *node, + const struct rb_node *parent) +{ + struct gunyah_vm_io_handler *n = + container_of(node, struct gunyah_vm_io_handler, node); + struct gunyah_vm_io_handler *p = + container_of(parent, struct gunyah_vm_io_handler, node); + + if (n->addr < p->addr) + return -1; + if (n->addr > p->addr) + return 1; + if ((n->len && !p->len) || (!n->len && p->len)) + return 0; + if (n->len < p->len) + return -1; + if (n->len > p->len) + return 1; + /* one of the io handlers doesn't have datamatch and the other does. + * For purposes of comparison, that makes them identical since the + * one that doesn't have datamatch will cover the same handler that + * does. + */ + if (n->datamatch != p->datamatch) + return 0; + if (n->data < p->data) + return -1; + if (n->data > p->data) + return 1; + return 0; +} + +static int gunyah_vm_io_handler_compare(struct rb_node *node, + const struct rb_node *parent) +{ + return _gunyah_vm_io_handler_compare(node, parent); +} + +static int gunyah_vm_io_handler_find(const void *key, + const struct rb_node *node) +{ + const struct gunyah_vm_io_handler *k = key; + + return _gunyah_vm_io_handler_compare(&k->node, node); +} + +static struct gunyah_vm_io_handler * +gunyah_vm_mgr_find_io_hdlr(struct gunyah_vm *ghvm, u64 addr, u64 len, u64 data) +{ + struct gunyah_vm_io_handler key = { + .addr = addr, + .len = len, + .datamatch = true, + .data = data, + }; + struct rb_node *node; + + node = rb_find(&key, &ghvm->mmio_handler_root, + gunyah_vm_io_handler_find); + if (!node) + return NULL; + + return container_of(node, struct gunyah_vm_io_handler, node); +} + +int gunyah_vm_mmio_write(struct gunyah_vm *ghvm, u64 addr, u32 len, u64 data) +{ + struct gunyah_vm_io_handler *io_hdlr = NULL; + int ret; + + down_read(&ghvm->mmio_handler_lock); + io_hdlr = gunyah_vm_mgr_find_io_hdlr(ghvm, addr, len, data); + if (!io_hdlr || !io_hdlr->ops || !io_hdlr->ops->write) { + ret = -ENOENT; + goto out; + } + + ret = io_hdlr->ops->write(io_hdlr, addr, len, data); + +out: + up_read(&ghvm->mmio_handler_lock); + return ret; +} +EXPORT_SYMBOL_GPL(gunyah_vm_mmio_write); + +int gunyah_vm_add_io_handler(struct gunyah_vm *ghvm, + struct gunyah_vm_io_handler *io_hdlr) +{ + struct rb_node *found; + + if (io_hdlr->datamatch && + (!io_hdlr->len || io_hdlr->len > sizeof(io_hdlr->data))) + return -EINVAL; + + down_write(&ghvm->mmio_handler_lock); + found = rb_find_add(&io_hdlr->node, &ghvm->mmio_handler_root, + gunyah_vm_io_handler_compare); + up_write(&ghvm->mmio_handler_lock); + + return found ? -EEXIST : 0; +} +EXPORT_SYMBOL_GPL(gunyah_vm_add_io_handler); + +void gunyah_vm_remove_io_handler(struct gunyah_vm *ghvm, + struct gunyah_vm_io_handler *io_hdlr) +{ + down_write(&ghvm->mmio_handler_lock); + rb_erase(&io_hdlr->node, &ghvm->mmio_handler_root); + up_write(&ghvm->mmio_handler_lock); +} +EXPORT_SYMBOL_GPL(gunyah_vm_remove_io_handler); + static int gunyah_vm_rm_notification_status(struct gunyah_vm *ghvm, void *data) { struct gunyah_rm_vm_status_payload *payload = data; @@ -404,6 +516,9 @@ static __must_check struct gunyah_vm *gunyah_vm_alloc(struct gunyah_rm *rm) INIT_LIST_HEAD(&ghvm->resource_tickets); xa_init(&ghvm->boot_context); + init_rwsem(&ghvm->mmio_handler_lock); + ghvm->mmio_handler_root = RB_ROOT; + mt_init(&ghvm->mm); mt_init(&ghvm->bindings); init_rwsem(&ghvm->bindings_lock); diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h index 8cee93e551700..daddb1d0cb70b 100644 --- a/drivers/virt/gunyah/vm_mgr.h +++ b/drivers/virt/gunyah/vm_mgr.h @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -58,6 +59,9 @@ long gunyah_dev_vm_mgr_ioctl(struct gunyah_rm *rm, unsigned int cmd, * @guest_shared_extent_ticket: Resource ticket to the capability for * the memory extent that represents * memory shared with the guest. + * @mmio_handler_root: RB tree of MMIO handlers. + * Entries are &struct gunyah_vm_io_handler + * @mmio_handler_lock: Serialization of traversing @mmio_handler_root * @rm: Pointer to the resource manager struct to make RM calls * @parent: For logging * @nb: Notifier block for RM notifications @@ -93,6 +97,8 @@ struct gunyah_vm { struct gunyah_vm_resource_ticket addrspace_ticket, host_private_extent_ticket, host_shared_extent_ticket, guest_private_extent_ticket, guest_shared_extent_ticket; + struct rb_root mmio_handler_root; + struct rw_semaphore mmio_handler_lock; struct gunyah_rm *rm; @@ -119,6 +125,8 @@ struct gunyah_vm { struct xarray boot_context; }; +int gunyah_vm_mmio_write(struct gunyah_vm *ghvm, u64 addr, u32 len, u64 data); + /** * folio_mmapped() - Returns true if the folio is mapped into any vma * @folio: Folio to test diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h index a9d58150de696..dbd5b0251b491 100644 --- a/include/linux/gunyah.h +++ b/include/linux/gunyah.h @@ -155,6 +155,35 @@ int gunyah_vm_add_resource_ticket(struct gunyah_vm *ghvm, void gunyah_vm_remove_resource_ticket(struct gunyah_vm *ghvm, struct gunyah_vm_resource_ticket *ticket); +/* + * gunyah_vm_io_handler contains the info about an io device and its associated + * addr and the ops associated with the io device. + */ +struct gunyah_vm_io_handler { + struct rb_node node; + u64 addr; + + bool datamatch; + u8 len; + u64 data; + struct gunyah_vm_io_handler_ops *ops; +}; + +/* + * gunyah_vm_io_handler_ops contains function pointers associated with an iodevice. + */ +struct gunyah_vm_io_handler_ops { + int (*read)(struct gunyah_vm_io_handler *io_dev, u64 addr, u32 len, + u64 data); + int (*write)(struct gunyah_vm_io_handler *io_dev, u64 addr, u32 len, + u64 data); +}; + +int gunyah_vm_add_io_handler(struct gunyah_vm *ghvm, + struct gunyah_vm_io_handler *io_dev); +void gunyah_vm_remove_io_handler(struct gunyah_vm *ghvm, + struct gunyah_vm_io_handler *io_dev); + #define GUNYAH_RM_ACL_X BIT(0) #define GUNYAH_RM_ACL_W BIT(1) #define GUNYAH_RM_ACL_R BIT(2)