mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 01:41:39 +00:00
xen: add batch completion callbacks
This adds a mechanism to register a callback function to be called once a batch of hypercalls has been issued. This is typically used to unlock things which must remain locked until the hypercall has taken place. [ Stable folks: pre-req for 2.6.23 bugfix "xen: deal with stale cr3 values when unpinning pagetables" ] Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Stable Kernel <stable@kernel.org>
This commit is contained in:
parent
f0d7339427
commit
91e0c5f3da
2 changed files with 29 additions and 3 deletions
|
@ -32,7 +32,11 @@
|
|||
struct mc_buffer {
|
||||
struct multicall_entry entries[MC_BATCH];
|
||||
u64 args[MC_ARGS];
|
||||
unsigned mcidx, argidx;
|
||||
struct callback {
|
||||
void (*fn)(void *);
|
||||
void *data;
|
||||
} callbacks[MC_BATCH];
|
||||
unsigned mcidx, argidx, cbidx;
|
||||
};
|
||||
|
||||
static DEFINE_PER_CPU(struct mc_buffer, mc_buffer);
|
||||
|
@ -43,6 +47,7 @@ void xen_mc_flush(void)
|
|||
struct mc_buffer *b = &__get_cpu_var(mc_buffer);
|
||||
int ret = 0;
|
||||
unsigned long flags;
|
||||
int i;
|
||||
|
||||
BUG_ON(preemptible());
|
||||
|
||||
|
@ -51,8 +56,6 @@ void xen_mc_flush(void)
|
|||
local_irq_save(flags);
|
||||
|
||||
if (b->mcidx) {
|
||||
int i;
|
||||
|
||||
if (HYPERVISOR_multicall(b->entries, b->mcidx) != 0)
|
||||
BUG();
|
||||
for (i = 0; i < b->mcidx; i++)
|
||||
|
@ -65,6 +68,13 @@ void xen_mc_flush(void)
|
|||
|
||||
local_irq_restore(flags);
|
||||
|
||||
for(i = 0; i < b->cbidx; i++) {
|
||||
struct callback *cb = &b->callbacks[i];
|
||||
|
||||
(*cb->fn)(cb->data);
|
||||
}
|
||||
b->cbidx = 0;
|
||||
|
||||
BUG_ON(ret);
|
||||
}
|
||||
|
||||
|
@ -88,3 +98,16 @@ struct multicall_space __xen_mc_entry(size_t args)
|
|||
|
||||
return ret;
|
||||
}
|
||||
|
||||
void xen_mc_callback(void (*fn)(void *), void *data)
|
||||
{
|
||||
struct mc_buffer *b = &__get_cpu_var(mc_buffer);
|
||||
struct callback *cb;
|
||||
|
||||
if (b->cbidx == MC_BATCH)
|
||||
xen_mc_flush();
|
||||
|
||||
cb = &b->callbacks[b->cbidx++];
|
||||
cb->fn = fn;
|
||||
cb->data = data;
|
||||
}
|
||||
|
|
|
@ -42,4 +42,7 @@ static inline void xen_mc_issue(unsigned mode)
|
|||
local_irq_restore(x86_read_percpu(xen_mc_irq_flags));
|
||||
}
|
||||
|
||||
/* Set up a callback to be called when the current batch is flushed */
|
||||
void xen_mc_callback(void (*fn)(void *), void *data);
|
||||
|
||||
#endif /* _XEN_MULTICALLS_H */
|
||||
|
|
Loading…
Reference in a new issue