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x86: kvm guest: pvclock vsyscall support

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Hook into generic pvclock vsyscall code, with the aim to
allow userspace to have visibility into pvclock data.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Marcelo Tosatti
2012-11-27 23:28:56 -02:00
parent 71056ae22d
commit 3dc4f7cfb7
3 changed files with 61 additions and 12 deletions
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13
arch/x86/kernel/kvm.c
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@@ -42,6 +42,7 @@
#include <asm/apic.h>
#include <asm/apicdef.h>
#include <asm/hypervisor.h>
#include <asm/kvm_guest.h>
static int kvmapf = 1;
@@ -62,6 +63,15 @@ static int parse_no_stealacc(char *arg)
early_param("no-steal-acc", parse_no_stealacc);
static int kvmclock_vsyscall = 1;
static int parse_no_kvmclock_vsyscall(char *arg)
{
kvmclock_vsyscall = 0;
return 0;
}
early_param("no-kvmclock-vsyscall", parse_no_kvmclock_vsyscall);
static DEFINE_PER_CPU(struct kvm_vcpu_pv_apf_data, apf_reason) __aligned(64);
static DEFINE_PER_CPU(struct kvm_steal_time, steal_time) __aligned(64);
static int has_steal_clock = 0;
@@ -471,6 +481,9 @@ void __init kvm_guest_init(void)
if (kvm_para_has_feature(KVM_FEATURE_PV_EOI))
apic_set_eoi_write(kvm_guest_apic_eoi_write);
if (kvmclock_vsyscall)
kvm_setup_vsyscall_timeinfo();
#ifdef CONFIG_SMP
smp_ops.smp_prepare_boot_cpu = kvm_smp_prepare_boot_cpu;
register_cpu_notifier(&kvm_cpu_notifier);