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| author |   Vitaly Kuznetsov <vkuznets@redhat.com> | 2022-01-17 16:05:40 +0100 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2022-01-17 12:29:41 -0500 |
| commit | c6617c61e8fe44b9e9fdfede921f61cac6b5149d (patch) | |
| tree | 0600727b137c2b9cd3b5096bfb7b205e6f522277 /tools/testing/selftests | |
| parent | KVM: x86: Do runtime CPUID update before updating vcpu->arch.cpuid_entries (diff) | |
| download | linux-dev-c6617c61e8fe44b9e9fdfede921f61cac6b5149d.tar.xz linux-dev-c6617c61e8fe44b9e9fdfede921f61cac6b5149d.zip | |
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 <imammedo@redhat.com>
Fixes: feb627e8d6f6 ("KVM: x86: Forbid KVM_SET_CPUID{,2} after KVM_RUN")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220117150542.2176196-3-vkuznets@redhat.com>
Cc: stable@vger.kernel.org
[Do not call kvm_find_cpuid_entry repeatedly. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/testing/selftests')
0 files changed, 0 insertions, 0 deletions