mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 22:51:42 +00:00
91e0c5f3da
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>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
#ifndef _XEN_MULTICALLS_H
|
|
#define _XEN_MULTICALLS_H
|
|
|
|
#include "xen-ops.h"
|
|
|
|
/* Multicalls */
|
|
struct multicall_space
|
|
{
|
|
struct multicall_entry *mc;
|
|
void *args;
|
|
};
|
|
|
|
/* Allocate room for a multicall and its args */
|
|
struct multicall_space __xen_mc_entry(size_t args);
|
|
|
|
DECLARE_PER_CPU(unsigned long, xen_mc_irq_flags);
|
|
|
|
/* Call to start a batch of multiple __xen_mc_entry()s. Must be
|
|
paired with xen_mc_issue() */
|
|
static inline void xen_mc_batch(void)
|
|
{
|
|
/* need to disable interrupts until this entry is complete */
|
|
local_irq_save(__get_cpu_var(xen_mc_irq_flags));
|
|
}
|
|
|
|
static inline struct multicall_space xen_mc_entry(size_t args)
|
|
{
|
|
xen_mc_batch();
|
|
return __xen_mc_entry(args);
|
|
}
|
|
|
|
/* Flush all pending multicalls */
|
|
void xen_mc_flush(void);
|
|
|
|
/* Issue a multicall if we're not in a lazy mode */
|
|
static inline void xen_mc_issue(unsigned mode)
|
|
{
|
|
if ((paravirt_get_lazy_mode() & mode) == 0)
|
|
xen_mc_flush();
|
|
|
|
/* restore flags saved in xen_mc_batch */
|
|
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 */
|