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x86: kvm: Revert "remove sched notifier for cross-cpu migrations"

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The following point:

    2. per-CPU pvclock time info is updated if the
       underlying CPU changes.

Is not true anymore since "KVM: x86: update pvclock area conditionally,
on cpu migration".

Add task migration notification back.

Problem noticed by Andy Lutomirski.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
CC: stable@kernel.org # 3.11+
This commit is contained in:
Marcelo Tosatti
2015-03-23 20:21:51 -03:00
parent 58d2930f4e
commit 0a4e6be9ca
5 changed files with 76 additions and 8 deletions
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1
arch/x86/include/asm/pvclock.h
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@@ -95,6 +95,7 @@ unsigned __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src,
struct pvclock_vsyscall_time_info {
struct pvclock_vcpu_time_info pvti;
u32 migrate_count;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));
#define PVTI_SIZE sizeof(struct pvclock_vsyscall_time_info)