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Co-developed-by: Prakruthi Deepak Heragu Signed-off-by: Prakruthi Deepak Heragu Signed-off-by: Elliot Berman Reviewed-by: Alex Elder --- Documentation/virt/gunyah/vm-manager.rst | 2 +- drivers/virt/gunyah/Kconfig | 9 ++ drivers/virt/gunyah/Makefile | 1 + drivers/virt/gunyah/gunyah_ioeventfd.c | 130 +++++++++++++++++++++++ include/uapi/linux/gunyah.h | 37 +++++++ 5 files changed, 178 insertions(+), 1 deletion(-) create mode 100644 drivers/virt/gunyah/gunyah_ioeventfd.c diff --git a/Documentation/virt/gunyah/vm-manager.rst b/Documentation/virt/gunyah/vm-manager.rst index c4960948c779..87838c5b5945 100644 --- a/Documentation/virt/gunyah/vm-manager.rst +++ b/Documentation/virt/gunyah/vm-manager.rst @@ -115,7 +115,7 @@ the VM *before* the VM starts. The argument types are documented below: .. kernel-doc:: include/uapi/linux/gunyah.h - :identifiers: gh_fn_vcpu_arg gh_fn_irqfd_arg gh_irqfd_flags + :identifiers: gh_fn_vcpu_arg gh_fn_irqfd_arg gh_irqfd_flags gh_fn_ioeventfd_arg gh_ioeventfd_flags Gunyah VCPU API Descriptions ---------------------------- diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig index bc2c46d9df94..63bebc5b9f82 100644 --- a/drivers/virt/gunyah/Kconfig +++ b/drivers/virt/gunyah/Kconfig @@ -48,3 +48,12 @@ config GUNYAH_IRQFD on Gunyah virtual machine. Say Y/M here if unsure and you want to support Gunyah VMMs. + +config GUNYAH_IOEVENTFD + tristate "Gunyah ioeventfd interface" + depends on GUNYAH + help + Enable kernel support for creating ioeventfds which can alert userspace + when a Gunyah virtual machine accesses a memory address. + + Say Y/M here if unsure and you want to support Gunyah VMMs. diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile index ad212a1cf967..63ca11e74796 100644 --- a/drivers/virt/gunyah/Makefile +++ b/drivers/virt/gunyah/Makefile @@ -8,3 +8,4 @@ obj-$(CONFIG_GUNYAH) += gunyah.o obj-$(CONFIG_GUNYAH_VCPU) += gunyah_vcpu.o obj-$(CONFIG_GUNYAH_IRQFD) += gunyah_irqfd.o +obj-$(CONFIG_GUNYAH_IOEVENTFD) += gunyah_ioeventfd.o diff --git a/drivers/virt/gunyah/gunyah_ioeventfd.c b/drivers/virt/gunyah/gunyah_ioeventfd.c new file mode 100644 index 000000000000..5b1b9fd9ac3a --- /dev/null +++ b/drivers/virt/gunyah/gunyah_ioeventfd.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include + +struct gh_ioeventfd { + struct gh_vm_function_instance *f; + struct gh_vm_io_handler io_handler; + + struct eventfd_ctx *ctx; +}; + +static int gh_write_ioeventfd(struct gh_vm_io_handler *io_dev, u64 addr, u32 len, u64 data) +{ + struct gh_ioeventfd *iofd = container_of(io_dev, struct gh_ioeventfd, io_handler); + + eventfd_signal(iofd->ctx, 1); + return 0; +} + +static struct gh_vm_io_handler_ops io_ops = { + .write = gh_write_ioeventfd, +}; + +static long gh_ioeventfd_bind(struct gh_vm_function_instance *f) +{ + const struct gh_fn_ioeventfd_arg *args = f->argp; + struct gh_ioeventfd *iofd; + struct eventfd_ctx *ctx; + int ret; + + if (f->arg_size != sizeof(*args)) + return -EINVAL; + + /* All other flag bits are reserved for future use */ + if (args->flags & ~GH_IOEVENTFD_FLAGS_DATAMATCH) + return -EINVAL; + + /* must be natural-word sized, or 0 to ignore length */ + switch (args->len) { + case 0: + case 1: + case 2: + case 4: + case 8: + break; + default: + return -EINVAL; + } + + /* check for range overflow */ + if (overflows_type(args->addr + args->len, u64)) + return -EINVAL; + + /* ioeventfd with no length can't be combined with DATAMATCH */ + if (!args->len && (args->flags & GH_IOEVENTFD_FLAGS_DATAMATCH)) + return -EINVAL; + + ctx = eventfd_ctx_fdget(args->fd); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + iofd = kzalloc(sizeof(*iofd), GFP_KERNEL); + if (!iofd) { + ret = -ENOMEM; + goto err_eventfd; + } + + f->data = iofd; + iofd->f = f; + + iofd->ctx = ctx; + + if (args->flags & GH_IOEVENTFD_FLAGS_DATAMATCH) { + iofd->io_handler.datamatch = true; + iofd->io_handler.len = args->len; + iofd->io_handler.data = args->datamatch; + } + iofd->io_handler.addr = args->addr; + iofd->io_handler.ops = &io_ops; + + ret = gh_vm_add_io_handler(f->ghvm, &iofd->io_handler); + if (ret) + goto err_io_dev_add; + + return 0; + +err_io_dev_add: + kfree(iofd); +err_eventfd: + eventfd_ctx_put(ctx); + return ret; +} + +static void gh_ioevent_unbind(struct gh_vm_function_instance *f) +{ + struct gh_ioeventfd *iofd = f->data; + + eventfd_ctx_put(iofd->ctx); + gh_vm_remove_io_handler(iofd->f->ghvm, &iofd->io_handler); + kfree(iofd); +} + +static bool gh_ioevent_compare(const struct gh_vm_function_instance *f, + const void *arg, size_t size) +{ + const struct gh_fn_ioeventfd_arg *instance = f->argp, + *other = arg; + + if (sizeof(*other) != size) + return false; + + return instance->addr == other->addr; +} + +DECLARE_GH_VM_FUNCTION_INIT(ioeventfd, GH_FN_IOEVENTFD, 3, + gh_ioeventfd_bind, gh_ioevent_unbind, + gh_ioevent_compare); +MODULE_DESCRIPTION("Gunyah ioeventfd VM Function"); +MODULE_LICENSE("GPL"); diff --git a/include/uapi/linux/gunyah.h b/include/uapi/linux/gunyah.h index 0c480c622686..fa1cae7419d2 100644 --- a/include/uapi/linux/gunyah.h +++ b/include/uapi/linux/gunyah.h @@ -79,10 +79,13 @@ struct gh_vm_dtb_config { * Return: file descriptor to manipulate the vcpu. * @GH_FN_IRQFD: register eventfd to assert a Gunyah doorbell * &struct gh_fn_desc.arg is a pointer to &struct gh_fn_irqfd_arg + * @GH_FN_IOEVENTFD: register ioeventfd to trigger when VM faults on parameter + * &struct gh_fn_desc.arg is a pointer to &struct gh_fn_ioeventfd_arg */ enum gh_fn_type { GH_FN_VCPU = 1, GH_FN_IRQFD, + GH_FN_IOEVENTFD, }; #define GH_FN_MAX_ARG_SIZE 256 @@ -134,6 +137,40 @@ struct gh_fn_irqfd_arg { __u32 padding; }; +/** + * enum gh_ioeventfd_flags - flags for use in gh_fn_ioeventfd_arg + * @GH_IOEVENTFD_FLAGS_DATAMATCH: the event will be signaled only if the + * written value to the registered address is + * equal to &struct gh_fn_ioeventfd_arg.datamatch + */ +enum gh_ioeventfd_flags { + GH_IOEVENTFD_FLAGS_DATAMATCH = 1UL << 0, +}; + +/** + * struct gh_fn_ioeventfd_arg - Arguments to create an ioeventfd function + * @datamatch: data used when GH_IOEVENTFD_DATAMATCH is set + * @addr: Address in guest memory + * @len: Length of access + * @fd: When ioeventfd is matched, this eventfd is written + * @flags: See &enum gh_ioeventfd_flags + * @padding: padding bytes + * + * Create this function with &GH_VM_ADD_FUNCTION using type &GH_FN_IOEVENTFD. + * + * Attaches an ioeventfd to a legal mmio address within the guest. A guest write + * in the registered address will signal the provided event instead of triggering + * an exit on the GH_VCPU_RUN ioctl. + */ +struct gh_fn_ioeventfd_arg { + __u64 datamatch; + __u64 addr; /* legal mmio address */ + __u32 len; /* 1, 2, 4, or 8 bytes; or 0 to ignore length */ + __s32 fd; + __u32 flags; + __u32 padding; +}; + /** * struct gh_fn_desc - Arguments to create a VM function * @type: Type of the function. See &enum gh_fn_type.