The patch titled
lguest: tsc fix
has been removed from the -mm tree. Its filename was
lguest-the-guest-code-tsc-fix.patch
This patch was dropped because it was folded into lguest-the-guest-code.patch
------------------------------------------------------
Subject: lguest: tsc fix
From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
In recent -mm kernels, the TSC capability cannot be disabled, resulting in a
divide by zero error in the normal sched_clock.
The correct fix is to have a special lguest sched_clock implementation: this
is as simple as it gets.
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/lguest/lguest.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff -puN drivers/lguest/lguest.c~lguest-the-guest-code-tsc-fix drivers/lguest/lguest.c
--- a/drivers/lguest/lguest.c~lguest-the-guest-code-tsc-fix
+++ a/drivers/lguest/lguest.c
@@ -352,13 +352,20 @@ static void lguest_time_irq(unsigned int
update_process_times(user_mode_vm(get_irq_regs()));
}
+static u64 sched_clock_base;
static void lguest_time_init(void)
{
set_irq_handler(0, lguest_time_irq);
hcall(LHCALL_TIMER_READ, 0, 0, 0);
+ sched_clock_base = jiffies_64;
enable_lguest_irq(0);
}
+static unsigned long long lguest_sched_clock(void)
+{
+ return (jiffies_64 - sched_clock_base) * (1000000000 / HZ);
+}
+
static void lguest_load_esp0(struct tss_struct *tss,
struct thread_struct *thread)
{
@@ -491,6 +498,7 @@ __init void lguest_init(void)
paravirt_ops.time_init = lguest_time_init;
paravirt_ops.set_lazy_mode = lguest_lazy_mode;
paravirt_ops.wbinvd = lguest_wbinvd;
+ paravirt_ops.sched_clock = lguest_sched_clock;
hcall(LHCALL_LGUEST_INIT, __pa(&lguest_data), 0, 0);
strncpy(boot_command_line, boot->cmdline, COMMAND_LINE_SIZE);
@@ -506,8 +514,6 @@ __init void lguest_init(void)
/* Math is always hard! */
new_cpu_data.hard_math = 1;
- tsc_disable = 1;
-
#ifdef CONFIG_X86_MCE
mce_disabled = 1;
#endif
_
Patches currently in -mm which might be from rusty@xxxxxxxxxxxxxxx are
git-kbuild.patch
paravirt-helper-to-disable-all-io-space.patch
paravirt-helper-to-disable-all-io-space-fix.patch
xen-disable-all-non-virtual-devices.patch
mm-clean-up-and-kernelify-shrinker-registration.patch
use-menuconfig-objects-ii-module-menu.patch
fix-stop_machine_run-problem-with-naughty-real-time-process.patch
cpu-hotplug-fix-ksoftirqd-termination-on-cpu-hotplug-with-naughty-realtime-process.patch
cpu-hotplug-fix-ksoftirqd-termination-on-cpu-hotplug-with-naughty-realtime-process-fix.patch
lguest-export-symbols-for-lguest-as-a-module.patch
lguest-the-guest-code.patch
lguest-the-guest-code-tsc-fix.patch
lguest-the-guest-code-suppress-ide-probing.patch
lguest-the-host-code.patch
lguest-the-host-code-tidyups.patch
lguest-the-host-code-tidyups-update.patch
lguest-the-host-code-borkages.patch
lguest-faster-tls-switching.patch
lguest-the-host-code-dont-signal-like-crazy-use-lhreq_break-command.patch
lguest-the-host-code-use-tsc.patch
lguest-the-host-code-use-hrtimers.patch
lguest-the-host-code-update-for-mm-simplify-boot_params.patch
lguest-the-asm-offsets.patch
lguest-the-makefile-and-kconfig.patch
lguest-the-makefile-and-kconfig-tidyups.patch
lguest-the-console-driver.patch
lguest-the-console-driver-tidyups.patch
lguest-the-net-driver.patch
lguest-the-net-driver-tidyups.patch
lguest-the-net-driver-tidyups-update.patch
lguest-the-net-driver-include-fix.patch
lguest-the-block-driver.patch
lguest-the-block-driver-tidyups.patch
lguest-the-block-driver-tidyups-update.patch
lguest-the-documentation-example-launcher.patch
lguest-the-documentation-example-launcher-example-launcher-fix.patch
lguest-dont-signal-like-crazy-use-lhreq_break-command-doc.patch
lguest-documentation-infrastructure-and-chapter-i.patch
mm-clean-up-and-kernelify-shrinker-registration-reiser4.patch
-
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