KVM: nVMX: Reset eVMCS clean fields data from prepare_vmcs02()

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When nested state migration happens during L1's execution, it
is incorrect to modify eVMCS as it is L1 who 'owns' it at the moment.
At least genuine Hyper-V seems to not be very happy when 'clean fields'
data changes underneath it.

'Clean fields' data is used in KVM twice: by copy_enlightened_to_vmcs12()
and prepare_vmcs02_rare() so we can reset it from prepare_vmcs02() instead.

While at it, update a comment stating why exactly we need to reset
'hv_clean_fields' data from L0.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210526132026.270394-10-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Vitaly Kuznetsov 2021-05-26 15:20:24 +02:00 • committed by Paolo Bonzini

parent b7685cfd5e

commit dc31338552

1 changed files with 13 additions and 6 deletions

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arch/x86/kvm/vmx/nested.c

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