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| author |   Radim Krčmář <rkrcmar@redhat.com> | 2018-02-01 22:16:21 +0100 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2018-02-24 01:43:48 +0100 |
| commit | fe2a3027e74e40a3ece3a4c1e4e51403090a907a (patch) | |
| tree | 1f69d431c10dd68c11f429d2cac9af9cea3bb490 /Documentation/futex-requeue-pi.txt | |
| parent | kvm: fix warning for non-x86 builds (diff) | |
| download | linux-dev-fe2a3027e74e40a3ece3a4c1e4e51403090a907a.tar.xz linux-dev-fe2a3027e74e40a3ece3a4c1e4e51403090a907a.zip | |
KVM: x86: fix backward migration with async_PF
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: 52a5c155cf79 ("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>
Diffstat (limited to 'Documentation/futex-requeue-pi.txt')
0 files changed, 0 insertions, 0 deletions