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authorRusty Russell <rusty@rustcorp.com.au>2007-07-26 23:42:52 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-28 22:54:33 -0400
commit6c8dca5d53f95009d4fff00195bf38f277dc4366 (patch)
tree60cc83cf949d6e598e6dc80dc668aebd42c65540 /include/linux/lguest.h
parenta8a11f06973fa63ad692a8f97694cb5eeb70b3f3 (diff)
Provide timespec to guests rather than jiffies clock.
A non-periodic clock_event_device and the "jiffies" clock don't mix well: tick_handle_periodic() can go into an infinite loop. Currently lguest guests use the jiffies clock when the TSC is unusable. Instead, make the Host write the current time into the lguest page on every interrupt. This doesn't cost much but is more precise and at least as accurate as the jiffies clock. It also gets rid of the GET_WALLCLOCK hypercall. Also, delay setting sched_clock until our clock is set up, otherwise the early printk timestamps can go backwards (not harmful, just ugly). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/lguest.h')
-rw-r--r--include/linux/lguest.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/lguest.h b/include/linux/lguest.h
index e76c151c712..157ad64aa7c 100644
--- a/include/linux/lguest.h
+++ b/include/linux/lguest.h
@@ -17,7 +17,6 @@
17#define LHCALL_TS 8 17#define LHCALL_TS 8
18#define LHCALL_SET_CLOCKEVENT 9 18#define LHCALL_SET_CLOCKEVENT 9
19#define LHCALL_HALT 10 19#define LHCALL_HALT 10
20#define LHCALL_GET_WALLCLOCK 11
21#define LHCALL_BIND_DMA 12 20#define LHCALL_BIND_DMA 12
22#define LHCALL_SEND_DMA 13 21#define LHCALL_SEND_DMA 13
23#define LHCALL_SET_PTE 14 22#define LHCALL_SET_PTE 14
@@ -88,6 +87,9 @@ struct lguest_data
88 * this address would normally be found. */ 87 * this address would normally be found. */
89 unsigned long cr2; 88 unsigned long cr2;
90 89
90 /* Wallclock time set by the Host. */
91 struct timespec time;
92
91 /* Async hypercall ring. Instead of directly making hypercalls, we can 93 /* Async hypercall ring. Instead of directly making hypercalls, we can
92 * place them in here for processing the next time the Host wants. 94 * place them in here for processing the next time the Host wants.
93 * This batching can be quite efficient. */ 95 * This batching can be quite efficient. */