linux-kernel - Re: [RFC PATCH 13/16] drivers/xen: gnttab, evtchn, xenbus API changes

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Date:   Mon, 17 Jun 2019 12:07:05 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Ankur Arora <ankur.a.arora@...cle.com>,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     pbonzini@...hat.com, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com, sstabellini@...nel.org,
        joao.m.martins@...cle.com
Subject: Re: [RFC PATCH 13/16] drivers/xen: gnttab, evtchn, xenbus API changes

On 09.05.19 19:25, Ankur Arora wrote:
> Mechanical changes, now most of these calls take xenhost_t *
> as parameter.
> 
> Co-developed-by: Joao Martins <joao.m.martins@...cle.com>
> Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
> ---
>   drivers/xen/cpu_hotplug.c     | 14 ++++++-------
>   drivers/xen/gntalloc.c        | 13 ++++++++----
>   drivers/xen/gntdev.c          | 16 +++++++++++----
>   drivers/xen/manage.c          | 37 ++++++++++++++++++-----------------
>   drivers/xen/platform-pci.c    | 12 +++++++-----
>   drivers/xen/sys-hypervisor.c  | 12 ++++++++----
>   drivers/xen/xen-balloon.c     | 10 +++++++---
>   drivers/xen/xenfs/xenstored.c |  7 ++++---
>   8 files changed, 73 insertions(+), 48 deletions(-)
> 
> diff --git a/drivers/xen/cpu_hotplug.c b/drivers/xen/cpu_hotplug.c
> index afeb94446d34..4a05bc028956 100644
> --- a/drivers/xen/cpu_hotplug.c
> +++ b/drivers/xen/cpu_hotplug.c
> @@ -31,13 +31,13 @@ static void disable_hotplug_cpu(int cpu)
>   	unlock_device_hotplug();
>   }
>   
> -static int vcpu_online(unsigned int cpu)
> +static int vcpu_online(xenhost_t *xh, unsigned int cpu)

Do we really need xenhost for cpu on/offlinig?

> diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
> index 9a69d955dd5c..1655d0a039fd 100644
> --- a/drivers/xen/manage.c
> +++ b/drivers/xen/manage.c
> @@ -227,14 +227,14 @@ static void shutdown_handler(struct xenbus_watch *watch,
>   		return;
>   
>    again:
> -	err = xenbus_transaction_start(xh_default, &xbt);
> +	err = xenbus_transaction_start(watch->xh, &xbt);
>   	if (err)
>   		return;
>   
> -	str = (char *)xenbus_read(xh_default, xbt, "control", "shutdown", NULL);
> +	str = (char *)xenbus_read(watch->xh, xbt, "control", "shutdown", NULL);
>   	/* Ignore read errors and empty reads. */
>   	if (XENBUS_IS_ERR_READ(str)) {
> -		xenbus_transaction_end(xh_default, xbt, 1);
> +		xenbus_transaction_end(watch->xh, xbt, 1);
>   		return;
>   	}
>   
> @@ -245,9 +245,9 @@ static void shutdown_handler(struct xenbus_watch *watch,
>   
>   	/* Only acknowledge commands which we are prepared to handle. */
>   	if (idx < ARRAY_SIZE(shutdown_handlers))
> -		xenbus_write(xh_default, xbt, "control", "shutdown", "");
> +		xenbus_write(watch->xh, xbt, "control", "shutdown", "");
>   
> -	err = xenbus_transaction_end(xh_default, xbt, 0);
> +	err = xenbus_transaction_end(watch->xh, xbt, 0);
>   	if (err == -EAGAIN) {
>   		kfree(str);
>   		goto again;
> @@ -272,10 +272,10 @@ static void sysrq_handler(struct xenbus_watch *watch, const char *path,
>   	int err;
>   
>    again:
> -	err = xenbus_transaction_start(xh_default, &xbt);
> +	err = xenbus_transaction_start(watch->xh, &xbt);
>   	if (err)
>   		return;
> -	err = xenbus_scanf(xh_default, xbt, "control", "sysrq", "%c", &sysrq_key);
> +	err = xenbus_scanf(watch->xh, xbt, "control", "sysrq", "%c", &sysrq_key);
>   	if (err < 0) {
>   		/*
>   		 * The Xenstore watch fires directly after registering it and
> @@ -287,21 +287,21 @@ static void sysrq_handler(struct xenbus_watch *watch, const char *path,
>   		if (err != -ENOENT && err != -ERANGE)
>   			pr_err("Error %d reading sysrq code in control/sysrq\n",
>   			       err);
> -		xenbus_transaction_end(xh_default, xbt, 1);
> +		xenbus_transaction_end(watch->xh, xbt, 1);
>   		return;
>   	}
>   
>   	if (sysrq_key != '\0') {
> -		err = xenbus_printf(xh_default, xbt, "control", "sysrq", "%c", '\0');
> +		err = xenbus_printf(watch->xh, xbt, "control", "sysrq", "%c", '\0');
>   		if (err) {
>   			pr_err("%s: Error %d writing sysrq in control/sysrq\n",
>   			       __func__, err);
> -			xenbus_transaction_end(xh_default, xbt, 1);
> +			xenbus_transaction_end(watch->xh, xbt, 1);
>   			return;
>   		}
>   	}
>   
> -	err = xenbus_transaction_end(xh_default, xbt, 0);
> +	err = xenbus_transaction_end(watch->xh, xbt, 0);
>   	if (err == -EAGAIN)
>   		goto again;
>   
> @@ -324,14 +324,14 @@ static struct notifier_block xen_reboot_nb = {
>   	.notifier_call = poweroff_nb,
>   };
>   
> -static int setup_shutdown_watcher(void)
> +static int setup_shutdown_watcher(xenhost_t *xh)

I think shutdown is purely local, too.


Juergen