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| author | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:27:09 -0600 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:27:10 +0930 |
| commit | df60aeef4f4fe0645d9a195a7689005520422de5 (patch) | |
| tree | 3cfa3c4a986436c8accd5f0a57d5a6f70f1b7965 /drivers/lguest/core.c | |
| parent | 5718607bb670c721f45f0dbb1cc7d6c64969aab1 (diff) | |
| download | blackbird-op-linux-df60aeef4f4fe0645d9a195a7689005520422de5.tar.gz blackbird-op-linux-df60aeef4f4fe0645d9a195a7689005520422de5.zip | |
lguest: use eventfds for device notification
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>
Diffstat (limited to 'drivers/lguest/core.c')
| -rw-r--r-- | drivers/lguest/core.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c index d0298dc45d97..508569c9571a 100644 --- a/drivers/lguest/core.c +++ b/drivers/lguest/core.c @@ -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 */ |
