[Xen-devel] [PATCH 11/12] Support VIRQ_TIMER and pvclock on HVM

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 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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