[PATCH 12/12] Provide the correct exit qualification upon EPT violation to L1 VMM.

["Nakajima, Jun" <jun.nakajima@xxxxxxxxx>]

Since vcpu_vmx is contained in vmx.c, use kvm_vcpu_arch so that we can
use the exit quaflication in paging_tmpl.h.

Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>

modified:   arch/x86/include/asm/kvm_host.h
modified:   arch/x86/kvm/paging_tmpl.h
modified:   arch/x86/kvm/vmx.c
---
 arch/x86/include/asm/kvm_host.h | 2 ++
 arch/x86/kvm/paging_tmpl.h      | 4 ++++
 arch/x86/kvm/vmx.c              | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4979778..5d1fdf2 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -504,6 +504,8 @@ struct kvm_vcpu_arch {
  * instruction.
  */
  bool write_fault_to_shadow_pgtable;
+
+ unsigned long exit_qualification;
 };

 struct kvm_lpage_info {
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 6226b51..0da6044 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -349,7 +349,11 @@ error:

  walker->fault.vector = PF_VECTOR;
  walker->fault.error_code_valid = true;
+#if PTTYPE != PTTYPE_EPT
  walker->fault.error_code = errcode;
+#else
+ walker->fault.error_code = vcpu->arch.exit_qualification & 0x7; /*
exit_qualificaiton */
+#endif
  walker->fault.address = addr;
  walker->fault.nested_page_fault = mmu != vcpu->arch.walk_mmu;

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 95304cc..61e2853 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -425,6 +425,7 @@ struct vcpu_vmx {
  ktime_t entry_time;
  s64 vnmi_blocked_time;
  u32 exit_reason;
+ unsigned long exit_qualification;

  bool rdtscp_enabled;

@@ -5074,6 +5075,8 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
  /* ept page table is present? */
  error_code |= (exit_qualification >> 3) & 0x1;

+    vcpu->arch.exit_qualification = exit_qualification;
+
  return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0);
 }

--
1.8.2.1.610.g562af5b
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