linux-kernel - Re: [PATCH 06/17] virt: acrn: Introduce VM management interfaces

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Date:   Fri, 28 Aug 2020 12:27:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     shuo.a.liu@...el.com
Cc:     linux-kernel@...r.kernel.org, "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Yu Wang <yu1.wang@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
        Zhi Wang <zhi.a.wang@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: Re: [PATCH 06/17] virt: acrn: Introduce VM management interfaces

On Tue, Aug 25, 2020 at 10:45:06AM +0800, shuo.a.liu@...el.com wrote:
> From: Shuo Liu <shuo.a.liu@...el.com>
> 
> The VM management interfaces expose several VM operations to ACRN
> userspace via ioctls. For example, creating VM, starting VM, destroying
> VM and so on.
> 
> The ACRN Hypervisor needs to exchange data with the ACRN userspace
> during the VM operations. HSM provides VM operation ioctls to the ACRN
> userspace and communicates with the ACRN Hypervisor for VM operations
> via hypercalls.
> 
> HSM maintains a list of User VM. Each User VM will be bound to an
> existing file descriptor of /dev/acrn_hsm. The User VM will be
> destroyed when the file descriptor is closed.
> 
> Signed-off-by: Shuo Liu <shuo.a.liu@...el.com>
> Reviewed-by: Zhi Wang <zhi.a.wang@...el.com>
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
> Cc: Zhi Wang <zhi.a.wang@...el.com>
> Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>
> Cc: Yu Wang <yu1.wang@...el.com>
> Cc: Reinette Chatre <reinette.chatre@...el.com>
> ---
>  drivers/virt/acrn/Makefile    |  2 +-
>  drivers/virt/acrn/acrn_drv.h  | 16 ++++++++-
>  drivers/virt/acrn/hsm.c       | 58 +++++++++++++++++++++++++++++-
>  drivers/virt/acrn/hypercall.h | 62 ++++++++++++++++++++++++++++++++
>  drivers/virt/acrn/vm.c        | 66 +++++++++++++++++++++++++++++++++++
>  include/uapi/linux/acrn.h     | 36 +++++++++++++++++++
>  6 files changed, 237 insertions(+), 3 deletions(-)
>  create mode 100644 drivers/virt/acrn/vm.c
> 
> diff --git a/drivers/virt/acrn/Makefile b/drivers/virt/acrn/Makefile
> index 6920ed798aaf..cf8b4ed5e74e 100644
> --- a/drivers/virt/acrn/Makefile
> +++ b/drivers/virt/acrn/Makefile
> @@ -1,3 +1,3 @@
>  # SPDX-License-Identifier: GPL-2.0
>  obj-$(CONFIG_ACRN_HSM)	:= acrn.o
> -acrn-y := hsm.o
> +acrn-y := hsm.o vm.o
> diff --git a/drivers/virt/acrn/acrn_drv.h b/drivers/virt/acrn/acrn_drv.h
> index 36f43d8d43d0..35fcb5cbbff3 100644
> --- a/drivers/virt/acrn/acrn_drv.h
> +++ b/drivers/virt/acrn/acrn_drv.h
> @@ -10,12 +10,26 @@
>  
>  #define ACRN_INVALID_VMID (0xffffU)
>  
> +#define ACRN_VM_FLAG_DESTROYED		0U
> +extern struct list_head acrn_vm_list;
> +extern rwlock_t acrn_vm_list_lock;
>  /**
>   * struct acrn_vm - Properties of ACRN User VM.
> + * @list:	Entry within global list of all VMs
>   * @vmid:	User VM ID
> + * @vcpu_num:	Number of virtual CPUs in the VM
> + * @flags:	Flags (ACRN_VM_FLAG_*) of the VM. This is VM flag management
> + *		in HSM which is different from the &acrn_vm_creation.vm_flag.
>   */
>  struct acrn_vm {
> -	u16	vmid;
> +	struct list_head	list;
> +	u16			vmid;
> +	int			vcpu_num;
> +	unsigned long		flags;
>  };
>  
> +struct acrn_vm *acrn_vm_create(struct acrn_vm *vm,
> +			       struct acrn_vm_creation *vm_param);
> +int acrn_vm_destroy(struct acrn_vm *vm);
> +
>  #endif /* __ACRN_HSM_DRV_H */
> diff --git a/drivers/virt/acrn/hsm.c b/drivers/virt/acrn/hsm.c
> index a08169f35c96..ed8921a6c68b 100644
> --- a/drivers/virt/acrn/hsm.c
> +++ b/drivers/virt/acrn/hsm.c
> @@ -45,19 +45,75 @@ static int acrn_dev_open(struct inode *inode, struct file *filp)
>  static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
>  			   unsigned long ioctl_param)
>  {
> +	struct acrn_vm *vm = filp->private_data;
> +	struct acrn_vm_creation *vm_param;
> +	int ret = 0;
> +
>  	if (cmd == ACRN_IOCTL_GET_API_VERSION) {
>  		if (copy_to_user((void __user *)ioctl_param,
>  				 &api_version, sizeof(api_version)))
>  			return -EFAULT;
> +		return 0;
>  	}
>  
> -	return 0;
> +	if (vm->vmid == ACRN_INVALID_VMID && cmd != ACRN_IOCTL_CREATE_VM) {
> +		pr_err("ioctl 0x%x: Invalid VM state!\n", cmd);

For this whole driver, you have a real 'struct device' to use, please
use it for all of these error messages everywhere.  dev_err() gives you
much more information than pr_err() does.

Same everywhere in this patch series.

thanks,

greg k-h