| Message ID | 20220928195633.2348848-13-quic_eberman@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Drivers for gunyah hypervisor | expand |
On Wed, Sep 28, 2022 at 12:56:31PM -0700, Elliot Berman wrote: > Gunyah resource manager defines a simple API for virtual machine log > sharing with the console service. A VM's own log can be opened by using > GH_VMID_SELF. Another VM's log can be accessed via its VMID. Once > opened, characters can be written to the log with a write command. > Characters are received with resource manager notifications (using ID > GH_RM_NOTIF_VM_CONSOLE_CHARS). > > These high level rpc calls are kept in > drivers/virt/gunyah/rsc_mgr_rpc.c. Future RPC calls, e.g. to launch a VM > will also be maintained in this file. > > Signed-off-by: Elliot Berman <quic_eberman@quicinc.com> > --- > drivers/virt/gunyah/Makefile | 2 +- > drivers/virt/gunyah/rsc_mgr.h | 22 +++++ > drivers/virt/gunyah/rsc_mgr_rpc.c | 151 ++++++++++++++++++++++++++++++ > include/linux/gunyah_rsc_mgr.h | 16 ++++ > 4 files changed, 190 insertions(+), 1 deletion(-) > create mode 100644 drivers/virt/gunyah/rsc_mgr_rpc.c > > diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile > index 7c512490f921..73339ed445b3 100644 > --- a/drivers/virt/gunyah/Makefile > +++ b/drivers/virt/gunyah/Makefile > @@ -1,5 +1,5 @@ > gunyah-y += sysfs.o > obj-$(CONFIG_GUNYAH) += gunyah.o > > -gunyah_rsc_mgr-y += rsc_mgr.o > +gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o > obj-$(CONFIG_GUNYAH_RESORUCE_MANAGER) += gunyah_rsc_mgr.o > diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h > index e4f2499267bf..deb884979209 100644 > --- a/drivers/virt/gunyah/rsc_mgr.h > +++ b/drivers/virt/gunyah/rsc_mgr.h > @@ -28,6 +28,28 @@ > #define GH_RM_ERROR_IRQ_INUSE 0x10 > #define GH_RM_ERROR_IRQ_RELEASED 0x11 > > +/* Message IDs: VM Management */ > +#define GH_RM_RPC_VM_GET_VMID 0x56000024 > + > +/* Message IDs: VM Services */ > +#define GH_RM_RPC_VM_CONSOLE_OPEN_ID 0x56000081 > +#define GH_RM_RPC_VM_CONSOLE_CLOSE_ID 0x56000082 > +#define GH_RM_RPC_VM_CONSOLE_WRITE_ID 0x56000083 > +#define GH_RM_RPC_VM_CONSOLE_FLUSH_ID 0x56000084 > + > +/* Call: CONSOLE_OPEN, CONSOLE_CLOSE, CONSOLE_FLUSH */ > +struct gh_vm_console_common_req { > + u16 vmid; > + u16 reserved0; > +} __packed; > + > +/* Call: CONSOLE_WRITE */ > +struct gh_vm_console_write_req { > + u16 vmid; > + u16 num_bytes; > + u8 data[0]; > +} __packed; > + > int gh_rm_call(u32 message_id, void *req_buff, size_t req_buff_size, > void **resp_buf, size_t *resp_buff_size); > > diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c > new file mode 100644 > index 000000000000..8238c6ef301f > --- /dev/null > +++ b/drivers/virt/gunyah/rsc_mgr_rpc.c > @@ -0,0 +1,151 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. > + */ > + > +#define pr_fmt(fmt) "gh_rsc_mgr: " fmt > + > +#include <linux/slab.h> > +#include <linux/types.h> > +#include <linux/printk.h> > +#include <linux/gunyah_rsc_mgr.h> > + > +#include "rsc_mgr.h" > + > +/** > + * gh_rm_get_vmid() - Retrieve VMID of this virtual machine > + * @vmid: Filled with the VMID of this VM > + */ > +int gh_rm_get_vmid(u16 *vmid) > +{ > + void *resp; > + size_t resp_size; > + int ret; > + int payload = 0; > + > + ret = gh_rm_call(GH_RM_RPC_VM_GET_VMID, &payload, sizeof(payload), &resp, &resp_size); > + if (ret) > + return ret; > + > + if (resp_size != sizeof(*vmid)) > + return -EIO; > + *vmid = *(u16 *)resp; > + kfree(resp); > + > + return ret; > +} > + > +/** > + * gh_rm_console_open() - Open a console with a VM > + * @vmid: VMID of the other VM whose console to open. If VMID is GH_VMID_SELF, the > + * console associated with this VM is opened. > + */ > +int gh_rm_console_open(u16 vmid) > +{ > + void *resp; > + struct gh_vm_console_common_req req_payload = {0}; > + size_t resp_size; > + int ret; > + > + req_payload.vmid = vmid; > + > + ret = gh_rm_call(GH_RM_RPC_VM_CONSOLE_OPEN_ID, > + &req_payload, sizeof(req_payload), > + &resp, &resp_size); > + kfree(resp); > + > + if (!ret && resp_size) > + pr_warn("Received unexpected payload for CONSOLE_OPEN: %lu\n", resp_size); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(gh_rm_console_open); > + > +/** > + * gh_rm_console_close() - Close a console with a VM > + * @vmid: The vmid of the vm whose console to close. > + */ > +int gh_rm_console_close(u16 vmid) > +{ > + void *resp; > + struct gh_vm_console_common_req req_payload = {0}; > + size_t resp_size; > + int ret; > + > + req_payload.vmid = vmid; > + > + ret = gh_rm_call(GH_RM_RPC_VM_CONSOLE_CLOSE_ID, > + &req_payload, sizeof(req_payload), > + &resp, &resp_size); > + kfree(resp); > + > + if (!ret && resp_size) > + pr_warn("Received unexpected payload for CONSOLE_CLOSE: %lu\n", resp_size); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(gh_rm_console_close); > + > +/** > + * gh_rm_console_write() - Write to a VM's console > + * @vmid: The vmid of the vm whose console to write to. > + * @buf: Buffer to write to the VM's console > + * @size: Size of the buffer > + */ > +int gh_rm_console_write(u16 vmid, const char *buf, size_t size) > +{ > + void *resp; > + struct gh_vm_console_write_req *req_payload; > + size_t resp_size; > + int ret = 0; > + size_t req_payload_size = sizeof(*req_payload) + size; > + > + if (size < 1 || size > (U32_MAX - sizeof(*req_payload))) > + return -EINVAL; > + > + req_payload = kzalloc(req_payload_size, GFP_KERNEL); > + > + if (!req_payload) > + return -ENOMEM; > + > + req_payload->vmid = vmid; > + req_payload->num_bytes = size; > + memcpy(req_payload->data, buf, size); > + > + ret = gh_rm_call(GH_RM_RPC_VM_CONSOLE_WRITE_ID, > + req_payload, req_payload_size, > + &resp, &resp_size); > + kfree(req_payload); > + kfree(resp); > + > + if (!ret && resp_size) > + pr_warn("Received unexpected payload for CONSOLE_WRITE: %lu\n", resp_size); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(gh_rm_console_write); > + > +/** > + * gh_rm_console_flush() - Flush a console with a VM > + * @vmid: The vmid of the vm whose console to flush > + */ > +int gh_rm_console_flush(u16 vmid) > +{ > + void *resp; > + struct gh_vm_console_common_req req_payload = {0}; > + size_t resp_size; > + int ret; > + > + req_payload.vmid = vmid; > + > + ret = gh_rm_call(GH_RM_RPC_VM_CONSOLE_FLUSH_ID, > + &req_payload, sizeof(req_payload), > + &resp, &resp_size); > + kfree(resp); > + > + if (!ret && resp_size) > + pr_warn("Received unexpected payload for CONSOLE_FLUSH: %lu\n", resp_size); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(gh_rm_console_flush); > diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h > index b3b37225b7fb..f831ca921c26 100644 > --- a/include/linux/gunyah_rsc_mgr.h > +++ b/include/linux/gunyah_rsc_mgr.h > @@ -23,4 +23,20 @@ struct gh_rm_notification { > int gh_rm_register_notifier(struct notifier_block *nb); > int gh_rm_unregister_notifier(struct notifier_block *nb); > > +/* Notification type Message IDs */ > +#define GH_RM_NOTIF_VM_CONSOLE_CHARS 0x56100080 > + > +struct gh_rm_notif_vm_console_chars { > + u16 vmid; > + u16 num_bytes; > + u8 bytes[0]; Please do not use [0] for new structures, otherwise we will just have to fix them up again as we are trying to get rid of all of these from the kernel. Just use "bytes[];" instead. thanks, greg k-h
diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile index 7c512490f921..73339ed445b3 100644 --- a/drivers/virt/gunyah/Makefile +++ b/drivers/virt/gunyah/Makefile @@ -1,5 +1,5 @@ gunyah-y += sysfs.o obj-$(CONFIG_GUNYAH) += gunyah.o -gunyah_rsc_mgr-y += rsc_mgr.o +gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o obj-$(CONFIG_GUNYAH_RESORUCE_MANAGER) += gunyah_rsc_mgr.o diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h index e4f2499267bf..deb884979209 100644 --- a/drivers/virt/gunyah/rsc_mgr.h +++ b/drivers/virt/gunyah/rsc_mgr.h @@ -28,6 +28,28 @@ #define GH_RM_ERROR_IRQ_INUSE 0x10 #define GH_RM_ERROR_IRQ_RELEASED 0x11 +/* Message IDs: VM Management */ +#define GH_RM_RPC_VM_GET_VMID 0x56000024 + +/* Message IDs: VM Services */ +#define GH_RM_RPC_VM_CONSOLE_OPEN_ID 0x56000081 +#define GH_RM_RPC_VM_CONSOLE_CLOSE_ID 0x56000082 +#define GH_RM_RPC_VM_CONSOLE_WRITE_ID 0x56000083 +#define GH_RM_RPC_VM_CONSOLE_FLUSH_ID 0x56000084 + +/* Call: CONSOLE_OPEN, CONSOLE_CLOSE, CONSOLE_FLUSH */ +struct gh_vm_console_common_req { + u16 vmid; + u16 reserved0; +} __packed; + +/* Call: CONSOLE_WRITE */ +struct gh_vm_console_write_req { + u16 vmid; + u16 num_bytes; + u8 data[0]; +} __packed; + int gh_rm_call(u32 message_id, void *req_buff, size_t req_buff_size, void **resp_buf, size_t *resp_buff_size); diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c new file mode 100644 index 000000000000..8238c6ef301f --- /dev/null +++ b/drivers/virt/gunyah/rsc_mgr_rpc.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#define pr_fmt(fmt) "gh_rsc_mgr: " fmt + +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/printk.h> +#include <linux/gunyah_rsc_mgr.h> + +#include "rsc_mgr.h" + +/** + * gh_rm_get_vmid() - Retrieve VMID of this virtual machine + * @vmid: Filled with the VMID of this VM + */ +int gh_rm_get_vmid(u16 *vmid) +{ + void *resp; + size_t resp_size; + int ret; + int payload = 0; + + ret = gh_rm_call(GH_RM_RPC_VM_GET_VMID, &payload, sizeof(payload), &resp, &resp_size); + if (ret) + return ret; + + if (resp_size != sizeof(*vmid)) + return -EIO; + *vmid = *(u16 *)resp; + kfree(resp); + + return ret; +} + +/** + * gh_rm_console_open() - Open a console with a VM + * @vmid: VMID of the other VM whose console to open. If VMID is GH_VMID_SELF, the + * console associated with this VM is opened. + */ +int gh_rm_console_open(u16 vmid) +{ + void *resp; + struct gh_vm_console_common_req req_payload = {0}; + size_t resp_size; + int ret; + + req_payload.vmid = vmid; + + ret = gh_rm_call(GH_RM_RPC_VM_CONSOLE_OPEN_ID, + &req_payload, sizeof(req_payload), + &resp, &resp_size); + kfree(resp); + + if (!ret && resp_size) + pr_warn("Received unexpected payload for CONSOLE_OPEN: %lu\n", resp_size); + + return ret; +} +EXPORT_SYMBOL_GPL(gh_rm_console_open); + +/** + * gh_rm_console_close() - Close a console with a VM + * @vmid: The vmid of the vm whose console to close. + */ +int gh_rm_console_close(u16 vmid) +{ + void *resp; + struct gh_vm_console_common_req req_payload = {0}; + size_t resp_size; + int ret; + + req_payload.vmid = vmid; + + ret = gh_rm_call(GH_RM_RPC_VM_CONSOLE_CLOSE_ID, + &req_payload, sizeof(req_payload), + &resp, &resp_size); + kfree(resp); + + if (!ret && resp_size) + pr_warn("Received unexpected payload for CONSOLE_CLOSE: %lu\n", resp_size); + + return ret; +} +EXPORT_SYMBOL_GPL(gh_rm_console_close); + +/** + * gh_rm_console_write() - Write to a VM's console + * @vmid: The vmid of the vm whose console to write to. + * @buf: Buffer to write to the VM's console + * @size: Size of the buffer + */ +int gh_rm_console_write(u16 vmid, const char *buf, size_t size) +{ + void *resp; + struct gh_vm_console_write_req *req_payload; + size_t resp_size; + int ret = 0; + size_t req_payload_size = sizeof(*req_payload) + size; + + if (size < 1 || size > (U32_MAX - sizeof(*req_payload))) + return -EINVAL; + + req_payload = kzalloc(req_payload_size, GFP_KERNEL); + + if (!req_payload) + return -ENOMEM; + + req_payload->vmid = vmid; + req_payload->num_bytes = size; + memcpy(req_payload->data, buf, size); + + ret = gh_rm_call(GH_RM_RPC_VM_CONSOLE_WRITE_ID, + req_payload, req_payload_size, + &resp, &resp_size); + kfree(req_payload); + kfree(resp); + + if (!ret && resp_size) + pr_warn("Received unexpected payload for CONSOLE_WRITE: %lu\n", resp_size); + + return ret; +} +EXPORT_SYMBOL_GPL(gh_rm_console_write); + +/** + * gh_rm_console_flush() - Flush a console with a VM + * @vmid: The vmid of the vm whose console to flush + */ +int gh_rm_console_flush(u16 vmid) +{ + void *resp; + struct gh_vm_console_common_req req_payload = {0}; + size_t resp_size; + int ret; + + req_payload.vmid = vmid; + + ret = gh_rm_call(GH_RM_RPC_VM_CONSOLE_FLUSH_ID, + &req_payload, sizeof(req_payload), + &resp, &resp_size); + kfree(resp); + + if (!ret && resp_size) + pr_warn("Received unexpected payload for CONSOLE_FLUSH: %lu\n", resp_size); + + return ret; +} +EXPORT_SYMBOL_GPL(gh_rm_console_flush); diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h index b3b37225b7fb..f831ca921c26 100644 --- a/include/linux/gunyah_rsc_mgr.h +++ b/include/linux/gunyah_rsc_mgr.h @@ -23,4 +23,20 @@ struct gh_rm_notification { int gh_rm_register_notifier(struct notifier_block *nb); int gh_rm_unregister_notifier(struct notifier_block *nb); +/* Notification type Message IDs */ +#define GH_RM_NOTIF_VM_CONSOLE_CHARS 0x56100080 + +struct gh_rm_notif_vm_console_chars { + u16 vmid; + u16 num_bytes; + u8 bytes[0]; +} __packed; + +/* RPC Calls */ +int gh_rm_get_vmid(u16 *vmid); +int gh_rm_console_open(u16 vmid); +int gh_rm_console_close(u16 vmid); +int gh_rm_console_write(u16 vmid, const char *buf, size_t size); +int gh_rm_console_flush(u16 vmid); + #endif
Gunyah resource manager defines a simple API for virtual machine log sharing with the console service. A VM's own log can be opened by using GH_VMID_SELF. Another VM's log can be accessed via its VMID. Once opened, characters can be written to the log with a write command. Characters are received with resource manager notifications (using ID GH_RM_NOTIF_VM_CONSOLE_CHARS). These high level rpc calls are kept in drivers/virt/gunyah/rsc_mgr_rpc.c. Future RPC calls, e.g. to launch a VM will also be maintained in this file. Signed-off-by: Elliot Berman <quic_eberman@quicinc.com> --- drivers/virt/gunyah/Makefile | 2 +- drivers/virt/gunyah/rsc_mgr.h | 22 +++++ drivers/virt/gunyah/rsc_mgr_rpc.c | 151 ++++++++++++++++++++++++++++++ include/linux/gunyah_rsc_mgr.h | 16 ++++ 4 files changed, 190 insertions(+), 1 deletion(-) create mode 100644 drivers/virt/gunyah/rsc_mgr_rpc.c