On 08/26/2009 10:13 PM, Davide Libenzi wrote:
Ok, so why not using the eventfd counter as state?
On the device side:
void write_state(int sfd, int state) {
u64 cnt;
/* Clear the current state, sfd is in non-blocking mode */
read(sfd,&cnt, sizeof(cnt));
/* Writes new state */
cnt = 1 + !!state;
write(sfd,&cnt, sizeof(cnt));
}
On the hypervisor side:
int read_state(int sfd) {
u64 cnt;
read(sfd,&cnt, sizeof(cnt));
return state - 1;
}
Hadn't though of read+write as set. While the 1+ is a little ugly, it's
workable.
I see no kernel equivalent to read(), but that's easily done.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
