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Subject[PATCH 11/12] Support VIRQ_TIMER and pvclock on HVM
Date
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
arch/x86/xen/enlighten.c | 39 +++++++++++++++++++++++++++++++++++++-
arch/x86/xen/time.c | 3 ++
drivers/xen/manage.c | 1 +
include/xen/interface/features.h | 3 ++
4 files changed, 45 insertions(+), 1 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 77ba321..41677fe 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1274,6 +1274,7 @@ void init_shared_info(void)
{
struct xen_add_to_physmap xatp;
static struct shared_info *shared_info_page = 0;
+ int cpu;

if (!shared_info_page)
shared_info_page = (struct shared_info *) alloc_bootmem_pages(PAGE_SIZE);
@@ -1288,7 +1289,42 @@ void init_shared_info(void)

/* Don't do the full vcpu_info placement stuff until we have a
possible map and a non-dummy shared_info. */
- per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
+ /* This code is run at resume time so make sure all the online cpus
+ * have xen_vcpu properly set */
+ for_each_online_cpu(cpu)
+ per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
+}
+
+static void xen_hvm_setup_cpu_clockevents(void)
+{
+ int cpu = smp_processor_id();
+ xen_setup_timer(cpu);
+ per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
+ xen_setup_cpu_clockevents();
+}
+
+static void init_hvm_time(void)
+{
+#ifdef CONFIG_SMP
+ /* vector callback is needed otherwise we cannot receive interrupts
+ * on cpu > 0 */
+ if (!xen_have_vector_callback)
+ return;
+#endif
+ if (!xen_feature(XENFEAT_hvm_safe_pvclock)) {
+ printk(KERN_WARNING "Xen doesn't support pvclock on HVM,"
+ "disable pv timer\n");
+ return;
+ }
+
+ pv_time_ops = xen_time_ops;
+ x86_init.timers.timer_init = xen_time_init;
+ x86_init.timers.setup_percpu_clockev = x86_init_noop;
+ x86_cpuinit.setup_percpu_clockev = xen_hvm_setup_cpu_clockevents;
+
+ x86_platform.calibrate_tsc = xen_tsc_khz;
+ x86_platform.get_wallclock = xen_get_wallclock;
+ x86_platform.set_wallclock = xen_set_wallclock;
}

int xen_set_callback_via(uint64_t via)
@@ -1373,6 +1409,7 @@ void __init xen_guest_init(void)
outw(unplug, XEN_IOPORT_UNPLUG);
have_vcpu_info_placement = 0;
x86_init.irqs.intr_init = xen_init_IRQ;
+ init_hvm_time();
}

static int __init parse_unplug(char *arg)
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 32764b8..620e68f 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -19,6 +19,7 @@
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>

+#include <xen/xen.h>
#include <xen/events.h>
#include <xen/interface/xen.h>
#include <xen/interface/vcpu.h>
@@ -470,6 +471,8 @@ void xen_timer_resume(void)
for_each_online_cpu(cpu) {
if (HYPERVISOR_vcpu_op(VCPUOP_stop_periodic_timer, cpu, NULL))
BUG();
+ if (xen_hvm_domain())
+ xen_setup_runstate_info(cpu);
}
}

diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index 49ee52d..4a8af22 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -60,6 +60,7 @@ static int xen_hvm_suspend(void *data)
if (!*cancelled) {
xen_irq_resume();
platform_pci_resume_hook();
+ xen_timer_resume();
}

return 0;
diff --git a/include/xen/interface/features.h b/include/xen/interface/features.h
index 8ab08b9..70d2563 100644
--- a/include/xen/interface/features.h
+++ b/include/xen/interface/features.h
@@ -44,6 +44,9 @@
/* x86: Does this Xen host support the HVM callback vector type? */
#define XENFEAT_hvm_callback_vector 8

+/* x86: pvclock algorithm is safe to use on HVM */
+#define XENFEAT_hvm_safe_pvclock 9
+
#define XENFEAT_NR_SUBMAPS 1

#endif /* __XEN_PUBLIC_FEATURES_H__ */
--
1.5.4.3


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