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linux/arch/x86/vdso
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Radim Krčmář ad9e5bf0b5 x86: vdso: fix pvclock races with task migration 
commit 80f7fdb1c7 upstream.

If we were migrated right after __getcpu, but before reading the
migration_count, we wouldn't notice that we read TSC of a different
VCPU, nor that KVM's bug made pvti invalid, as only migration_count
on source VCPU is increased.

Change vdso instead of updating migration_count on destination.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Fixes: 0a4e6be9ca ("x86: kvm: Revert "remove sched notifier for cross-cpu migrations"")
Message-Id: <1428000263-11892-1-git-send-email-rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
History 2015-05-05 11:09:52 +01:00
..
vdso32 x86/vdso: Fix the build on GCC5 2015-03-30 11:11:01 +01:00
.gitignore x86, vdso: Reimplement vdso.so preparation in build-time C 2014-05-05 13:18:51 -07:00
checkundef.sh x86, vdso: Don't quote $nm in the script for checking vdso references 2010-07-27 23:52:29 -07:00
Makefile x86/vdso: Move DISABLE_BRANCH_PROFILING into the vdso makefile 2014-06-24 13:53:00 -07:00
vclock_gettime.c x86: vdso: fix pvclock races with task migration 2015-05-05 11:09:52 +01:00
vdso-fakesections.c x86/vdso: Remove some redundant in-memory section headers 2014-06-19 15:45:26 -07:00
vdso-layout.lds.S x86/vdso: Remove some redundant in-memory section headers 2014-06-19 15:45:26 -07:00
vdso-note.S x86_64: move vdso 2007-10-11 11:17:10 +02:00
vdso.lds.S x86/vdso: Improve the fake section headers 2014-06-19 15:45:12 -07:00
vdso2c.c x86/vdso: Improve the fake section headers 2014-06-19 15:45:12 -07:00
vdso2c.h x86-64, vdso: Fix vDSO build breakage due to empty .rela.dyn 2014-07-10 15:59:56 -07:00
vdso32-setup.c x86, mm: Improve _install_special_mapping and fix x86 vdso naming 2014-05-20 11:38:42 -07:00
vdsox32.lds.S x86/vdso: Improve the fake section headers 2014-06-19 15:45:12 -07:00
vgetcpu.c x86: vdso: pvclock gettime support 2012-11-27 23:29:11 -02:00
vma.c x86_64, vdso: Fix the vdso address randomization algorithm 2015-01-15 22:41:20 +00:00