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lguest: use eventfds for device notification

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Currently, when a Guest wants to perform I/O it calls LHCALL_NOTIFY with
an address: the main Launcher process returns with this address, and figures
out what device to run.

A far nicer model is to let processes bind an eventfd to an address: if we
find one, we simply signal the eventfd.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Davide Libenzi <davidel@xmailserver.org>
This commit is contained in:
Rusty Russell 2009-06-12 22:27:09 -06:00
parent 5718607bb6
commit df60aeef4f
5 changed files with 116 additions and 6 deletions
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8
drivers/lguest/core.c
View file

@ -198,9 +198,11 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
/* It's possible the Guest did a NOTIFY hypercall to the
* Launcher, in which case we return from the read() now. */
if (cpu->pending_notify) {
if (put_user(cpu->pending_notify, user))
return -EFAULT;
return sizeof(cpu->pending_notify);
if (!send_notify_to_eventfd(cpu)) {
if (put_user(cpu->pending_notify, user))
return -EFAULT;
return sizeof(cpu->pending_notify);
}
}
/* Check for signals */