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| author | Vitaly Kuznetsov <[email protected]> | 2022-01-17 16:05:40 +0100 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2022-01-17 12:29:41 -0500 |
| commit | c6617c61e8fe44b9e9fdfede921f61cac6b5149d (patch) | |
| tree | 0600727b137c2b9cd3b5096bfb7b205e6f522277 /lib/mpi/mpi-sub-ui.c | |
| parent | ee3a5f9e3d9bf94159f3cc80da542fbe83502dd8 (diff) | |
KVM: x86: Partially allow KVM_SET_CPUID{,2} after KVM_RUN
Commit feb627e8d6f6 ("KVM: x86: Forbid KVM_SET_CPUID{,2} after KVM_RUN")
forbade changing CPUID altogether but unfortunately this is not fully
compatible with existing VMMs. In particular, QEMU reuses vCPU fds for
CPU hotplug after unplug and it calls KVM_SET_CPUID2. Instead of full ban,
check whether the supplied CPUID data is equal to what was previously set.
Reported-by: Igor Mammedov <[email protected]>
Fixes: feb627e8d6f6 ("KVM: x86: Forbid KVM_SET_CPUID{,2} after KVM_RUN")
Signed-off-by: Vitaly Kuznetsov <[email protected]>
Message-Id: <[email protected]>
Cc: [email protected]
[Do not call kvm_find_cpuid_entry repeatedly. - Paolo]
Signed-off-by: Paolo Bonzini <[email protected]>
Diffstat (limited to 'lib/mpi/mpi-sub-ui.c')
0 files changed, 0 insertions, 0 deletions