lguest: Sanitize the lguest clock.

Now the TSC code handles a zero return from calculate_cpu_khz(),
lguest can simply pass through the value it gets from the Host: if
non-zero, all the normal TSC code applies.

Otherwise (or if the Host really doesn't support TSC), the clocksource
code will fall back to the slower but reasonable lguest clock.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 21 insertions, 32 deletions

diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index cccb38a5965..9c27c104d83 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -84,7 +84,6 @@ struct lguest_data lguest_data = {
         .blocked_interrupts = { 1 }, /* Block timer interrupts */
         .syscall_vec = SYSCALL_VECTOR,
 };
-static cycle_t clock_base;
 
 /*G:037 async_hcall() is pretty simple: I'm quite proud of it really.  We have a
  * ring buffer of stored hypercalls which the Host will run though next time we
@@ -327,8 +326,8 @@ static void lguest_cpuid(unsigned int *ax, unsigned int *bx,
         case 1: /* Basic feature request. */
                 /* We only allow kernel to see SSE3, CMPXCHG16B and SSSE3 */
                 *cx &= 0x00002201;
-                /* SSE, SSE2, FXSR, MMX, CMOV, CMPXCHG8B, FPU. */
-                *dx &= 0x07808101;
+                /* SSE, SSE2, FXSR, MMX, CMOV, CMPXCHG8B, TSC, FPU. */
+                *dx &= 0x07808111;
                 /* The Host can do a nice optimization if it knows that the
                  * kernel mappings (addresses above 0xC0000000 or whatever
                  * PAGE_OFFSET is set to) haven't changed.  But Linux calls
@@ -595,19 +594,25 @@ static unsigned long lguest_get_wallclock(void)
         return lguest_data.time.tv_sec;
 }
 
+/* The TSC is a Time Stamp Counter.  The Host tells us what speed it runs at,
+ * or 0 if it's unusable as a reliable clock source.  This matches what we want
+ * here: if we return 0 from this function, the x86 TSC clock will not register
+ * itself. */
+static unsigned long lguest_cpu_khz(void)
+{
+        return lguest_data.tsc_khz;
+}
+
+/* If we can't use the TSC, the kernel falls back to our "lguest_clock", where
+ * we read the time value given to us by the Host. */
 static cycle_t lguest_clock_read(void)
 {
         unsigned long sec, nsec;
 
-        /* If the Host tells the TSC speed, we can trust that. */
-        if (lguest_data.tsc_khz)
-                return native_read_tsc();
-
-        /* If we can't use the TSC, we read the time value written by the Host.
-         * Since it's in two parts (seconds and nanoseconds), we risk reading
-         * it just as it's changing from 99 & 0.999999999 to 100 and 0, and
-         * getting 99 and 0.  As Linux tends to come apart under the stress of
-         * time travel, we must be careful: */
+        /* Since the time is in two parts (seconds and nanoseconds), we risk
+         * reading it just as it's changing from 99 & 0.999999999 to 100 and 0,
+         * and getting 99 and 0.  As Linux tends to come apart under the stress
+         * of time travel, we must be careful: */
         do {
                 /* First we read the seconds part. */
                 sec = lguest_data.time.tv_sec;
@@ -622,14 +627,14 @@ static cycle_t lguest_clock_read(void)
                 /* Now if the seconds part has changed, try again. */
         } while (unlikely(lguest_data.time.tv_sec != sec));
 
-        /* Our non-TSC clock is in real nanoseconds. */
+        /* Our lguest clock is in real nanoseconds. */
         return sec*1000000000ULL + nsec;
 }
 
-/* This is what we tell the kernel is our clocksource.  */
+/* This is the fallback clocksource: lower priority than the TSC clocksource. */
 static struct clocksource lguest_clock = {
         .name           = "lguest",
-        .rating         = 400,
+        .rating         = 200,
         .read           = lguest_clock_read,
         .mask           = CLOCKSOURCE_MASK(64),
         .mult           = 1 << 22,
@@ -637,12 +642,6 @@ static struct clocksource lguest_clock = {
         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
-/* The "scheduler clock" is just our real clock, adjusted to start at zero */
-static unsigned long long lguest_sched_clock(void)
-{
-        return cyc2ns(&lguest_clock, lguest_clock_read() - clock_base);
-}
-
 /* We also need a "struct clock_event_device": Linux asks us to set it to go
  * off some time in the future.  Actually, James Morris figured all this out, I
  * just applied the patch. */
@@ -712,19 +711,8 @@ static void lguest_time_init(void)
         /* Set up the timer interrupt (0) to go to our simple timer routine */
         set_irq_handler(0, lguest_time_irq);
 
-        /* Our clock structure looks like arch/x86/kernel/tsc_32.c if we can
-         * use the TSC, otherwise it's a dumb nanosecond-resolution clock.
-         * Either way, the "rating" is set so high that it's always chosen over
-         * any other clocksource. */
-        if (lguest_data.tsc_khz)
-                lguest_clock.mult = clocksource_khz2mult(lguest_data.tsc_khz,
-                                                         lguest_clock.shift);
-        clock_base = lguest_clock_read();
         clocksource_register(&lguest_clock);
 
-        /* Now we've set up our clock, we can use it as the scheduler clock */
-        pv_time_ops.sched_clock = lguest_sched_clock;
-
         /* We can't set cpumask in the initializer: damn C limitations!  Set it
          * here and register our timer device. */
         lguest_clockevent.cpumask = cpumask_of_cpu(0);
@@ -995,6 +983,7 @@ __init void lguest_init(void)
         /* time operations */
         pv_time_ops.get_wallclock = lguest_get_wallclock;
         pv_time_ops.time_init = lguest_time_init;
+        pv_time_ops.get_cpu_khz = lguest_cpu_khz;
 
         /* Now is a good time to look at the implementations of these functions
          * before returning to the rest of lguest_init(). */