This is the guest part of kvm clock implementation
It does not do tsc-only timing, as tsc can have deltas
between cpus, and it did not seem worthy to me to keep
adjusting them.
We do use it, however, for fine-grained adjustment.
Other than that, time comes from the host.
Signed-off-by: Glauber de Oliveira Costa <[EMAIL PROTECTED]>
---
arch/x86/Kconfig | 10 +++
arch/x86/kernel/Makefile_32 | 1 +
arch/x86/kernel/kvmclock.c | 161 +++++++++++++++++++++++++++++++++++++++++++
arch/x86/kernel/setup_32.c | 5 ++
4 files changed, 177 insertions(+), 0 deletions(-)
create mode 100644 arch/x86/kernel/kvmclock.c
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ab2df55..968315e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -350,6 +350,16 @@ config VMI
at the moment), by linking the kernel to a GPL-ed ROM module
provided by the hypervisor.
+config KVM_CLOCK
+ bool "KVM paravirtualized clock"
+ select PARAVIRT
+ help
+ Turning on this option will allow you to run a paravirtualized clock
+ when running over the KVM hypervisor. Instead of relying on a PIT
+ (or probably other) emulation by the underlying device model, the host
+ provides the guest with timing infrastructure, as time of day, and
+ timer expiration.
+
source "arch/x86/lguest/Kconfig"
endif
diff --git a/arch/x86/kernel/Makefile_32 b/arch/x86/kernel/Makefile_32
index a7bc93c..f6332b6 100644
--- a/arch/x86/kernel/Makefile_32
+++ b/arch/x86/kernel/Makefile_32
@@ -44,6 +44,7 @@ obj-$(CONFIG_K8_NB) += k8.o
obj-$(CONFIG_MGEODE_LX) += geode_32.o mfgpt_32.o
obj-$(CONFIG_VMI) += vmi_32.o vmiclock_32.o
+obj-$(CONFIG_KVM_CLOCK) += kvmclock.o
obj-$(CONFIG_PARAVIRT) += paravirt_32.o
obj-y += pcspeaker.o
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
new file mode 100644
index 0000000..317bee0
--- /dev/null
+++ b/arch/x86/kernel/kvmclock.c
@@ -0,0 +1,161 @@
+/* KVM paravirtual clock driver. A clocksource implementation
+ Copyright (C) 2008 Glauber de Oliveira Costa, Red Hat Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#include <linux/clocksource.h>
+#include <linux/kvm_para.h>
+#include <asm/arch_hooks.h>
+#include <asm/msr.h>
+
+
+#define KVM_SCALE 22
+
+static int kvmclock = 1;
+
+static int parse_no_kvmclock(char *arg)
+{
+ kvmclock = 0;
+ return 0;
+}
+early_param("no-kvmclock", parse_no_kvmclock);
+
+struct xen_shared_info shared_info __attribute__((__aligned__(PAGE_SIZE)));
+
+/* The hypervisor will put information about time periodically here */
+DEFINE_PER_CPU(struct xen_vcpu_time_info *, hv_clock);
+#define get_clock(cpu, field) per_cpu(hv_clock, cpu)->field
+
+static inline u64 kvm_get_delta(u64 last_tsc)
+{
+ int cpu = smp_processor_id();
+ u64 delta = native_read_tsc() - last_tsc;
+ return (delta * get_clock(cpu, tsc_to_system_mul)) >> KVM_SCALE;
+}
+
+/*
+ * The wallclock is the time of day when we booted. Since then, some time may
+ * have elapsed since the hypervisor wrote the data. So we try to account for
+ * that. Even if the tsc is not accurate, it gives us a more accurate timing
+ * than not adjusting at all
+ */
+unsigned long kvm_get_wallclock(void)
+{
+ u32 wc_sec, wc_nsec;
+ u64 delta, last_tsc;
+ struct timespec ts;
+ int version, nsec, cpu = smp_processor_id();
+
+ do {
+ version = shared_info.wc_version;
+ rmb();
+ wc_sec = shared_info.wc_sec;
+ wc_nsec = shared_info.wc_nsec;
+ last_tsc = get_clock(cpu, tsc_timestamp);
+ rmb();
+ } while ((shared_info.wc_version != version) || (version & 1));
+
+ delta = kvm_get_delta(last_tsc);
+ delta += wc_nsec;
+ nsec = do_div(delta, NSEC_PER_SEC);
+ set_normalized_timespec(&ts, wc_sec + delta, nsec);
+ /*
+ * Of all mechanisms of time adjustment I've tested, this one
+ * was the champion!
+ */
+ return ts.tv_sec + 1;
+}
+
+int kvm_set_wallclock(unsigned long now)
+{
+ return 0;
+}
+
+/*
+ * This is our read_clock function. The host puts an tsc timestamp each time
+ * it updates a new time, and then we can use it to derive a slightly more
+ * precise notion of elapsed time, converted to nanoseconds.
+ */
+static cycle_t kvm_clock_read(void)
+{
+ u64 last_tsc, now;
+ u32 version;
+ int cpu;
+
+ preempt_disable();
+ cpu = smp_processor_id();
+
+ do {
+ version = get_clock(cpu, version);
+ rmb();
+ last_tsc = get_clock(cpu, tsc_timestamp);
+ now = get_clock(cpu, system_time);
+ rmb();
+ } while ((get_clock(cpu, version) != version) || (version & 1));
+
+ now += kvm_get_delta(last_tsc);
+ preempt_enable();
+
+ return now;
+}
+
+static struct clocksource kvm_clock = {
+ .name = "kvm-clock",
+ .read = kvm_clock_read,
+ .rating = 400,
+ .mask = CLOCKSOURCE_MASK(64),
+ .mult = 1 << KVM_SCALE,
+ .shift = KVM_SCALE,
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static int kvm_register_clock(void)
+{
+ int cpu = smp_processor_id();
+ u64 kvm_clock_info = (u64)(u64 *)&shared_info;
+
+ kvm_clock_info = __pa(kvm_clock_info);
+ __get_cpu_var(hv_clock) = &(shared_info.vcpu_info[cpu].time);
+
+ return native_write_msr_safe(MSR_KVM_PARAVIRT_CLOCK, kvm_clock_info);
+}
+
+static void kvm_setup_secondary_clock(void)
+{
+ /*
+ * Now that the first cpu already had this clocksource initialized,
+ * we shouldn't fail.
+ */
+ WARN_ON(kvm_register_clock());
+ /* ok, done with our trickery, call native */
+ setup_secondary_APIC_clock();
+}
+
+void __init kvmclock_init(void)
+{
+ if (!kvm_para_available())
+ return;
+
+ if (kvmclock && kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE)) {
+ if (kvm_register_clock())
+ return;
+ pv_time_ops.get_wallclock = kvm_get_wallclock;
+ pv_time_ops.set_wallclock = kvm_set_wallclock;
+ pv_time_ops.sched_clock = kvm_clock_read;
+ pv_apic_ops.setup_secondary_clock = kvm_setup_secondary_clock;
+ clocksource_register(&kvm_clock);
+ }
+}
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index 9c24b45..89c0eb2 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -44,6 +44,7 @@
#include <linux/crash_dump.h>
#include <linux/dmi.h>
#include <linux/pfn.h>
+#include <linux/kvm_para.h>
#include <video/edid.h>
@@ -614,6 +615,10 @@ void __init setup_arch(char **cmdline_p)
max_low_pfn = setup_memory();
+#ifdef CONFIG_KVM_CLOCK
+ kvmclock_init();
+#endif
+
#ifdef CONFIG_VMI
/*
* Must be after max_low_pfn is determined, and before kernel
--
1.5.0.6
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