KVM: nVMX: Always emulate PERF_GLOBAL_CTRL VM-Entry/VM-Exit controls

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Advertise VM_{ENTRY,EXIT}_LOAD_IA32_PERF_GLOBAL_CTRL as being supported
for nested VMs irrespective of hardware support.  KVM fully emulates
the controls, i.e. manually emulates MSR writes on entry/exit, and never
propagates the guest settings directly to vmcs02.

In addition to allowing L1 VMMs to use the controls on older hardware,
unconditionally advertising the controls will also allow KVM to use its
vmcs01 configuration as the basis for the nested VMX configuration
without causing a regression (due the errata which causes KVM to "hide"
the control from vmcs01 but not vmcs12).

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220830133737.1539624-19-vkuznets@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2022-08-30 15:37:22 +02:00 • committed by Paolo Bonzini

parent def9d705c0

commit f4c93d1a0e

1 changed files with 6 additions and 5 deletions

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arch/x86/kvm/vmx/nested.c

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