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author | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:27:09 -0600 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:27:10 +0930 |
commit | df60aeef4f4fe0645d9a195a7689005520422de5 (patch) | |
tree | 3cfa3c4a986436c8accd5f0a57d5a6f70f1b7965 /drivers/lguest/lg.h | |
parent | 5718607bb670c721f45f0dbb1cc7d6c64969aab1 (diff) | |
download | op-kernel-dev-df60aeef4f4fe0645d9a195a7689005520422de5.zip op-kernel-dev-df60aeef4f4fe0645d9a195a7689005520422de5.tar.gz |
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/lg.h')
-rw-r--r-- | drivers/lguest/lg.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index 040cb70..32fefdc 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -82,6 +82,16 @@ struct lg_cpu { struct lg_cpu_arch arch; }; +struct lg_eventfd { + unsigned long addr; + struct file *event; +}; + +struct lg_eventfd_map { + unsigned int num; + struct lg_eventfd map[]; +}; + /* The private info the thread maintains about the guest. */ struct lguest { @@ -102,6 +112,8 @@ struct lguest unsigned int stack_pages; u32 tsc_khz; + struct lg_eventfd_map *eventfds; + /* Dead? */ const char *dead; }; @@ -154,6 +166,7 @@ void setup_default_idt_entries(struct lguest_ro_state *state, void copy_traps(const struct lg_cpu *cpu, struct desc_struct *idt, const unsigned long *def); void guest_set_clockevent(struct lg_cpu *cpu, unsigned long delta); +bool send_notify_to_eventfd(struct lg_cpu *cpu); void init_clockdev(struct lg_cpu *cpu); bool check_syscall_vector(struct lguest *lg); int init_interrupts(void); |