[PATCH v9 11/27] gunyah: vm_mgr: Introduce basic VM Manager
Elliot Berman
quic_eberman at quicinc.com
Mon Feb 6 16:36:51 PST 2023
On 2/2/2023 4:54 AM, Srinivas Kandagatla wrote:
>
>
> On 20/01/2023 22:46, Elliot Berman wrote:
>> Gunyah VM manager is a kernel moduel which exposes an interface to
>> Gunyah userspace to load, run, and interact with other Gunyah virtual
>> machines. The interface is a character device at /dev/gunyah.
>>
>> Add a basic VM manager driver. Upcoming patches will add more ioctls
>> into this driver.
>>
>> Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu at quicinc.com>
>> Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu at quicinc.com>
>> Signed-off-by: Elliot Berman <quic_eberman at quicinc.com>
>> ---
>> .../userspace-api/ioctl/ioctl-number.rst | 1 +
>> drivers/virt/gunyah/Makefile | 2 +-
>> drivers/virt/gunyah/rsc_mgr.c | 51 +++++++-
>> drivers/virt/gunyah/vm_mgr.c | 117 ++++++++++++++++++
>> drivers/virt/gunyah/vm_mgr.h | 20 +++
>> include/linux/gunyah_rsc_mgr.h | 3 +
>> include/uapi/linux/gunyah.h | 23 ++++
>> 7 files changed, 215 insertions(+), 2 deletions(-)
>> create mode 100644 drivers/virt/gunyah/vm_mgr.c
>> create mode 100644 drivers/virt/gunyah/vm_mgr.h
>> create mode 100644 include/uapi/linux/gunyah.h
>>
>> diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst
>> b/Documentation/userspace-api/ioctl/ioctl-number.rst
>> index eb045fc495a4..8696dc3cdd83 100644
>> --- a/Documentation/userspace-api/ioctl/ioctl-number.rst
>> +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
>> @@ -137,6 +137,7 @@ Code Seq# Include
>> File Comments
>> 'F' DD video/sstfb.h
>> conflict!
>> 'G' 00-3F drivers/misc/sgi-gru/grulib.h
>> conflict!
>> 'G' 00-0F xen/gntalloc.h, xen/gntdev.h
>> conflict!
>> +'G' 00-0f linux/gunyah.h
>> conflict!
>> 'H' 00-7F linux/hiddev.h
>> conflict!
>> 'H' 00-0F linux/hidraw.h
>> conflict!
>> 'H' 01 linux/mei.h
>> conflict!
>> diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
>> index de29769f2f3f..03951cf82023 100644
>> --- a/drivers/virt/gunyah/Makefile
>> +++ b/drivers/virt/gunyah/Makefile
>> @@ -2,5 +2,5 @@
>> obj-$(CONFIG_GUNYAH) += gunyah.o
>> -gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o
>> +gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o
>> obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o
>> diff --git a/drivers/virt/gunyah/rsc_mgr.c
>> b/drivers/virt/gunyah/rsc_mgr.c
>> index 382f9943fd31..95f4aa928aaf 100644
>> --- a/drivers/virt/gunyah/rsc_mgr.c
>> +++ b/drivers/virt/gunyah/rsc_mgr.c
>> @@ -16,8 +16,10 @@
>> #include <linux/completion.h>
>> #include <linux/gunyah_rsc_mgr.h>
>> #include <linux/platform_device.h>
>> +#include <linux/miscdevice.h>
>> #include "rsc_mgr.h"
>> +#include "vm_mgr.h"
>> #define RM_RPC_API_VERSION_MASK GENMASK(3, 0)
>> #define RM_RPC_HEADER_WORDS_MASK GENMASK(7, 4)
>> @@ -105,6 +107,7 @@ struct gh_rm {
>> struct kmem_cache *cache;
>> struct mutex send_lock;
>> + struct miscdevice miscdev;
>> struct work_struct recv_work;
>> };
>> @@ -526,6 +529,33 @@ int gh_rm_call(struct gh_rm *rm, u32 message_id,
>> void *req_buff, size_t req_buff
>> return ret;
>> }
>> +void get_gh_rm(struct gh_rm *rm)
>> +{
>> + get_device(rm->dev);
>> +}
>> +EXPORT_SYMBOL_GPL(get_gh_rm);
>
> We have 4/5 different vairants of exported symbols now.
>
> EXPORT_SYMBOL_GPL(gunyah_vm_function_unregister);
> EXPORT_SYMBOL_GPL(ghvm_add_resource_ticket);
> EXPORT_SYMBOL_GPL(gh_vm_mgr_mmio_write);
> EXPORT_SYMBOL_GPL(put_gh_rm);
> EXPORT_SYMBOL_GPL(get_gunyah_vm);
>
> I think this needs to be cleaned up for consistency reasons.
>
Cleaned up in the v10. "gh_vm_" will be the prefix.
>> +
>> +void put_gh_rm(struct gh_rm *rm)
>> +{
>> + put_device(rm->dev);
>> +}
>> +EXPORT_SYMBOL_GPL(put_gh_rm);
>> +
>> +static long gh_dev_ioctl(struct file *filp, unsigned int cmd,
>> unsigned long arg)
>> +{
>> + struct miscdevice *miscdev = filp->private_data;
>> + struct gh_rm *rm = container_of(miscdev, struct gh_rm, miscdev);
>> +
>> + return gh_dev_vm_mgr_ioctl(rm, cmd, arg);
>> +}
>> +
>> +static const struct file_operations gh_dev_fops = {
>> + .owner = THIS_MODULE,
>> + .unlocked_ioctl = gh_dev_ioctl,
>> + .compat_ioctl = compat_ptr_ioctl,
>> + .llseek = noop_llseek,
>> +};
>> +
>> static int gh_msgq_platform_probe_direction(struct platform_device
>> *pdev,
>> bool tx, int idx, struct gunyah_resource *ghrsc)
>> {
>> @@ -582,13 +612,32 @@ static int gh_rm_drv_probe(struct
>> platform_device *pdev)
>> rm->msgq_client.rx_callback = gh_rm_msgq_rx_data;
>> rm->msgq_client.tx_done = gh_rm_msgq_tx_done;
>> - return gh_msgq_init(&pdev->dev, &rm->msgq, &rm->msgq_client,
>> &rm->tx_ghrsc, &rm->rx_ghrsc);
>> + ret = gh_msgq_init(&pdev->dev, &rm->msgq, &rm->msgq_client,
>> &rm->tx_ghrsc, &rm->rx_ghrsc);
>> + if (ret)
>> + goto err_cache;
>> +
>> + rm->miscdev.name = "gunyah";
>> + rm->miscdev.minor = MISC_DYNAMIC_MINOR;
>> + rm->miscdev.fops = &gh_dev_fops;
>> +
>> + ret = misc_register(&rm->miscdev);
>> + if (ret)
>> + goto err_msgq;
>> +
>> + return 0;
>> +err_msgq:
>> + mbox_free_channel(gh_msgq_chan(&rm->msgq));
>> + gh_msgq_remove(&rm->msgq);
>> +err_cache:
>> + kmem_cache_destroy(rm->cache);
>> + return ret;
>> }
>> static int gh_rm_drv_remove(struct platform_device *pdev)
>> {
>> struct gh_rm *rm = platform_get_drvdata(pdev);
>> + misc_deregister(&rm->miscdev);
>> mbox_free_channel(gh_msgq_chan(&rm->msgq));
>> gh_msgq_remove(&rm->msgq);
>> kmem_cache_destroy(rm->cache);
>> diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c
>> new file mode 100644
>> index 000000000000..0864dbd77e28
>> --- /dev/null
>> +++ b/drivers/virt/gunyah/vm_mgr.c
>> @@ -0,0 +1,117 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All
>> rights reserved.
>> + */
>> +
>> +#define pr_fmt(fmt) "gh_vm_mgr: " fmt
>> +
>> +#include <linux/anon_inodes.h>
>> +#include <linux/file.h>
>> +#include <linux/gunyah_rsc_mgr.h>
>> +#include <linux/miscdevice.h>
>> +#include <linux/module.h>
>> +
>> +#include <uapi/linux/gunyah.h>
>> +
>> +#include "vm_mgr.h"
>> +
>> +static __must_check struct gunyah_vm *gunyah_vm_alloc(struct
>> gh_rm_rpc *rm)
>> +{
>> + struct gunyah_vm *ghvm;
>> + int vmid;
>> +
>> + vmid = gh_rm_alloc_vmid(rm, 0);
>> + if (vmid < 0)
>> + return ERR_PTR(vmid);
>> +
>> + ghvm = kzalloc(sizeof(*ghvm), GFP_KERNEL);
>> + if (!ghvm) {
>> + gh_rm_dealloc_vmid(rm, vmid);
>> + return ghvm;
>
> return ERR_PTR(-ENOMEM);
>
Done.
>> + }
>> +
>> + get_gh_rm(rm);
>> +
>> + ghvm->vmid = vmid;
>> + ghvm->rm = rm;
>> +
>> + return ghvm;
>> +}
>> +
>> +static long gh_vm_ioctl(struct file *filp, unsigned int cmd, unsigned
>> long arg)
>> +{
>> + long r;
>> +
>> + switch (cmd) {
>> + default:
>> + r = -ENOTTY;
>> + break;
>> + }
>
> this function looks like dummy, why do we need this in this patch?
>
Refactored the patches to introduce when first ioctl is added.
>> +
>> + return r;
>> +}
>> +
>> +static int gh_vm_release(struct inode *inode, struct file *filp)
>> +{
>> + struct gunyah_vm *ghvm = filp->private_data;
>> +
>> + put_gh_rm(ghvm->rm);
>> + kfree(ghvm);
>> + return 0;
>> +}
>> +
>> +static const struct file_operations gh_vm_fops = {
>> + .unlocked_ioctl = gh_vm_ioctl,
>> + .release = gh_vm_release,
>> + .compat_ioctl = compat_ptr_ioctl,
>> + .llseek = noop_llseek,
>> +};
>> +
>> +static long gh_dev_ioctl_create_vm(struct gh_rm *rm, unsigned long arg)
>> +{
>> + struct gunyah_vm *ghvm;
>> + struct file *file;
>> + int fd, err;
>> +
>> + /* arg reserved for future use. */
>> + if (arg)
>> + return -EINVAL;
>
> Bit confused here, GH_CREATE_VM IOCTL does not take any arguments so why
> is this arg reserved for future use. Are you going to change the ABI for
> GH_CREATE_VM?
>
KVM uses the argument for architecture-specific VM flags. This series
only adds support for the "unauthenticated VM" type. I was thinking it
might be convenient to use this field to mux between the different
authentication types (zero would always mean "unauthenticated VM"). I've
not given a lot of thought to exact mechanics, but if I want to use in
the future, I think it should be reserved today to ensure there's no
backwards compatibility issues.
>
>> +
>> + ghvm = gunyah_vm_alloc(rm);
>> + if (IS_ERR_OR_NULL(ghvm))
>> + return PTR_ERR(ghvm) ? : -ENOMEM;
>> +
>> + fd = get_unused_fd_flags(O_CLOEXEC);
>> + if (fd < 0) {
>> + err = fd;
>> + goto err_destroy_vm;
>> + }
>> +
>> + file = anon_inode_getfile("gunyah-vm", &gh_vm_fops, ghvm, O_RDWR);
>> + if (IS_ERR(file)) {
>> + err = PTR_ERR(file);
>> + goto err_put_fd;
>> + }
>> +
>> + fd_install(fd, file);
>> +
>> + return fd;
>> +
>> +err_put_fd:
>> + put_unused_fd(fd);
>> +err_destroy_vm:
>> + kfree(ghvm);
>> + return err;
>> +}
>> +
>> +long gh_dev_vm_mgr_ioctl(struct gh_rm *rm, unsigned int cmd, unsigned
>> long arg)
>> +{
>> + switch (cmd) {
>> + case GH_CREATE_VM:
>> + return gh_dev_ioctl_create_vm(rm, arg);
>> + default:
>> + return -ENOIOCTLCMD;
>> + }
>> +}
>> +EXPORT_SYMBOL_GPL(gh_dev_vm_mgr_ioctl);
>> +
>> diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h
>> new file mode 100644
>> index 000000000000..e47f34de7f9e
>> --- /dev/null
>> +++ b/drivers/virt/gunyah/vm_mgr.h
>> @@ -0,0 +1,20 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only */
>> +/*
>> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All
>> rights reserved.
>> + */
>> +
>> +#ifndef _GH_PRIV_VM_MGR_H
>> +#define _GH_PRIV_VM_MGR_H
>> +
>> +#include <linux/gunyah_rsc_mgr.h>
>> +
>> +#include <uapi/linux/gunyah.h>
>> +
>> +long gh_dev_vm_mgr_ioctl(struct gh_rm *rm, unsigned int cmd, unsigned
>> long arg);
>> +
>> +struct gunyah_vm {
>> + u16 vmid;
>> + struct gh_rm_rpc *rm;
>> +};
>> +
>> +#endif
>> diff --git a/include/linux/gunyah_rsc_mgr.h
>> b/include/linux/gunyah_rsc_mgr.h
>> index be0bce5507b1..9a9a037b349a 100644
>> --- a/include/linux/gunyah_rsc_mgr.h
>> +++ b/include/linux/gunyah_rsc_mgr.h
>> @@ -17,6 +17,9 @@
>> struct gh_rm;
>> +void get_gh_rm(struct gh_rm *rm);
>> +void put_gh_rm(struct gh_rm *rm);
>> +
>> enum gh_rm_vm_status {
>> GH_RM_VM_STATUS_NO_STATE = 0,
>> GH_RM_VM_STATUS_INIT = 1,
>> diff --git a/include/uapi/linux/gunyah.h b/include/uapi/linux/gunyah.h
>> new file mode 100644
>> index 000000000000..88a40d6e0b96
>> --- /dev/null
>> +++ b/include/uapi/linux/gunyah.h
>> @@ -0,0 +1,23 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
>> +/*
>> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights
>> reserved.
>> + */
>> +
>> +#ifndef _UAPI_LINUX_GUNYAH
>> +#define _UAPI_LINUX_GUNYAH
>> +
>> +/*
>> + * Userspace interface for /dev/gunyah - gunyah based virtual machine
>> + */
>> +
>> +#include <linux/types.h>
>> +#include <linux/ioctl.h>
>> +
>> +#define GH_IOCTL_TYPE 'G'
>> +
>> +/*
>> + * ioctls for /dev/gunyah fds:
>> + */
>> +#define GH_CREATE_VM _IO(GH_IOCTL_TYPE, 0x0) /* Returns a
>> Gunyah VM fd */
>> +
>> +#endif
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