[PATCH 3/6] Emulator: Inject #PF when page was not found

[Alexander Graf <agraf@suse.de>]

If we couldn't find a page on read_emulated, it might be a good
idea to tell the guest about that and inject a #PF.

We do the same already for write faults. I don't know why it was
not implemented for reads.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/x86/kvm/x86.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5fcde2c..5aa1219 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2131,10 +2131,13 @@ static int emulator_read_emulated(unsigned long addr,
 		goto mmio;
 
 	if (kvm_read_guest_virt(addr, val, bytes, vcpu)
-				== X86EMUL_CONTINUE)
+				== X86EMUL_CONTINUE) {
 		return X86EMUL_CONTINUE;
-	if (gpa == UNMAPPED_GVA)
+	}
+	if (gpa == UNMAPPED_GVA) {
+		kvm_inject_page_fault(vcpu, addr, 0);
 		return X86EMUL_PROPAGATE_FAULT;
+	}
 
 mmio:
 	/*
-- 
1.6.0.2