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Radim Krčmář dc6fb79de4 KVM: x86: fix backward migration with async_PF 
commit fe2a3027e7 upstream.

Guests on new hypersiors might set KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT
bit when enabling async_PF, but this bit is reserved on old hypervisors,
which results in a failure upon migration.

To avoid breaking different cases, we are checking for CPUID feature bit
before enabling the feature and nothing else.

Fixes: 52a5c155cf ("KVM: async_pf: Let guest support delivery of async_pf from guest mode")
Cc: <stable@vger.kernel.org>
Reviewed-by: Wanpeng Li <wanpengli@tencent.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[jwang: port to 4.14]
Signed-off-by: Jack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2018-03-11 16:23:23 +01:00
..
arm arm/arm64: Add hyp-stub API documentation 2017-04-09 07:49:36 -07:00
devices KVM/ARM Changes for v4.14 2017-09-07 18:22:04 +02:00
00-INDEX KVM: Add halt polling documentation 2016-11-28 11:48:47 +11:00
api.txt kvm: x86: hyperv: make VP_INDEX managed by userspace 2017-07-14 16:28:18 +02:00
cpuid.txt KVM: x86: fix backward migration with async_PF 2018-03-11 16:23:23 +01:00
halt-polling.txt KVM: Add halt polling documentation 2016-11-28 11:48:47 +11:00
hypercalls.txt KVM: MIPS: Implement HYPCALL emulation 2017-03-28 14:53:33 +01:00
locking.txt kvm: x86: mmu: Update documentation for fast page fault mechanism 2017-01-09 14:46:12 +01:00
mmu.txt kvm: x86: mmu: allow A/D bits to be disabled in an mmu 2017-07-03 11:19:54 +02:00
msr.txt KVM: x86: fix backward migration with async_PF 2018-03-11 16:23:23 +01:00
nested-vmx.txt KVM: nVMX: Documentation 2011-07-12 13:15:22 +03:00
ppc-pv.txt Doc:kvm: Fix typo in Doc/virtual/kvm 2015-10-11 15:35:23 -06:00
review-checklist.txt docs: fix locations of several documents that got moved 2016-10-24 08:12:35 -02:00
s390-diag.txt KVM: s390: add documentation for diag 501 2014-04-22 13:24:51 +02:00
timekeeping.txt KVM: doc: Fix typo in doc/virtual/kvm 2013-12-31 17:24:54 -02:00
vcpu-requests.rst KVM: Add documentation for VCPU requests 2017-06-04 16:53:00 +02:00