KVM: nVMX: Ignore 'hv_clean_fields' data when eVMCS data is copied in vmx_get_nested_state()

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'Clean fields' data from enlightened VMCS is only valid upon vmentry: L1
hypervisor is not obliged to keep it up-to-date while it is mangling L2's
state, KVM_GET_NESTED_STATE request may come at a wrong moment when actual
eVMCS changes are unsynchronized with 'hv_clean_fields'. As upon migration
VMCS12 is used as a source of ultimate truth, we must make sure we pick all
the changes to eVMCS and thus 'clean fields' data must be ignored.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210526132026.270394-8-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Vitaly Kuznetsov 2021-05-26 15:20:22 +02:00 • committed by Paolo Bonzini

parent 3b19b81acf

commit d6bf71a18c

1 changed files with 25 additions and 18 deletions

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arch/x86/kvm/vmx/nested.c

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