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nEPT: Some additional comments

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Some additional comments to preexisting code:
Explain who (L0 or L1) handles EPT violation and misconfiguration exits.
Don't mention "shadow on either EPT or shadow" as the only two options.

Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Nadav Har'El <nyh@il.ibm.com>
Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Signed-off-by: Xinhao Xu <xinhao.xu@intel.com>
Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Har'El 2013-08-05 11:07:19 +03:00 committed by Paolo Bonzini
parent afa61f752b
commit 2b1be67741
1 changed files with 13 additions and 0 deletions
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13
arch/x86/kvm/vmx.c
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@ -6669,7 +6669,20 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
return nested_cpu_has2(vmcs12, return nested_cpu_has2(vmcs12,
SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES); SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
case EXIT_REASON_EPT_VIOLATION: case EXIT_REASON_EPT_VIOLATION:
/*
* L0 always deals with the EPT violation. If nested EPT is
* used, and the nested mmu code discovers that the address is
* missing in the guest EPT table (EPT12), the EPT violation
* will be injected with nested_ept_inject_page_fault()
*/
return 0;
case EXIT_REASON_EPT_MISCONFIG: case EXIT_REASON_EPT_MISCONFIG:
/*
* L2 never uses directly L1's EPT, but rather L0's own EPT
* table (shadow on EPT) or a merged EPT table that L0 built
* (EPT on EPT). So any problems with the structure of the
* table is L0's fault.
*/
return 0; return 0;
case EXIT_REASON_PREEMPTION_TIMER: case EXIT_REASON_PREEMPTION_TIMER:
return vmcs12->pin_based_vm_exec_control & return vmcs12->pin_based_vm_exec_control &