linux-kernel - Re: [RFC PATCH 10/15] drivers/acrn: add interrupt injection support

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Date:   Fri, 16 Aug 2019 16:12:03 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Zhao Yakui <yakui.zhao@...el.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Mingqiang Chi <mingqiang.chi@...el.com>,
        Jason Chen CJ <jason.cj.chen@...el.com>
Subject: Re: [RFC PATCH 10/15] drivers/acrn: add interrupt injection support

On Fri, Aug 16, 2019 at 10:25:51AM +0800, Zhao Yakui wrote:
> +	case IC_VM_INTR_MONITOR: {
> +		struct page *page;
> +
> +		ret = get_user_pages_fast(ioctl_param, 1, 1, &page);
> +		if (unlikely(ret != 1) || !page) {
                                       ^^^^^^^^
Not required.

> +			pr_err("acrn-dev: failed to pin intr hdr buffer!\n");
> +			return -ENOMEM;
> +		}
> +
> +		ret = hcall_vm_intr_monitor(vm->vmid, page_to_phys(page));
> +		if (ret < 0) {
> +			pr_err("acrn-dev: monitor intr data err=%ld\n", ret);
> +			return -EFAULT;
> +		}
> +		break;
> +	}
> +

regards,
dan carpenter