Stefano Stabellini
2010-May-10 14:20 UTC
[Xen-devel] [PATCH 11/11] Support VIRQ_TIMER and pvclock on HVM, disable hpet
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
arch/x86/xen/enlighten.c | 46 +++++++++++++++++++++++++++++++++++++-
arch/x86/xen/time.c | 2 +
drivers/xen/manage.c | 1 +
include/xen/interface/features.h | 3 ++
4 files changed, 51 insertions(+), 1 deletions(-)
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 84b7a84..3362876 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -58,6 +58,7 @@
#include <asm/tlbflush.h>
#include <asm/reboot.h>
#include <asm/stackprotector.h>
+#include <asm/hpet.h>
#include "xen-ops.h"
#include "mmu.h"
@@ -1253,6 +1254,7 @@ static 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);
@@ -1267,7 +1269,48 @@ static 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)
+{
+ int ret;
+ struct xen_hvm_param a;
+
+#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;
+
+ /* make sure hpet doesn''t think that it is initialized */
+ hpet_address = 0L;
}
int xen_set_callback_via(uint64_t via)
@@ -1313,6 +1356,7 @@ void xen_guest_init(void)
}
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 0a5aa44..567aa2b 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -471,6 +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())
+ setup_runstate_info(cpu);
}
}
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index 6b911d0..9b54305 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -58,6 +58,7 @@ 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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