Re: Hypercalls from user-space

[Jeremy Fitzhardinge <jeremy@goop.org>]

 On 10/05/2010 03:09 PM, Keir Fraser wrote:
> /proc/xen/privcmd should be available in domU as well. You might need to
> enable some dom0 build config options to get it though.

xenfs doesn't init privcmd on non-privileged kernels.

Srujan, this should be enough to enable it in domU:

diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 229c831..6495c61 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -109,7 +109,7 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
 	if (rc < 0)
 		return rc;
 
-	if (xen_initial_domain()) {
+	if (1 || xen_initial_domain()) {
 		xenfs_create_file(sb, sb->s_root, "xsd_kva",
 				  &xsd_kva_file_ops, NULL, S_IRUSR|S_IWUSR);
 		xenfs_create_file(sb, sb->s_root, "xsd_port",

	J

>  -- Keir
>
> On 05/10/2010 22:31, "Srujan D. Kotikela" <ksrujandas@gmail.com> wrote:
>
>> Hi Jeremy,
>>
>> I am able to do hypercalls in privileged domain. i want to invoke hypercalls
>> (to send EVENT notifications) from DomU.
>> Amy pointers for the same would be appreciated.
>>
>> --
>> Srujan D. Kotikela
>>
>>
>> On Fri, Sep 24, 2010 at 2:14 PM, Jeremy Fitzhardinge <jeremy@goop.org> wrote:
>>>  On 09/24/2010 11:38 AM, Srujan D. Kotikela wrote:
>>>> Hi,
>>>>
>>>> Can anyone tell me how to invoke hypercalls from user space? Or any
>>>> pointers for the same.
>>>>
>>>> It's urgent, please help.
>>>>
>>> You can't directly invoke hypercalls from userspace.   In a privileged
>>> domain you can use ioctls on /proc/xen/privcmd.
>>>
>>>     J
>>
>>
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>