[UNIKRAFT PATCH 1/2] plat/kvm: Support non-executable pages on x86

[stefanl.teodorescu@xxxxxxxxx]

From: Stefan Teodorescu <stefanl.teodorescu@xxxxxxxxx>

Setting this bit enables page table entries to have the NX bit set, to
have the ability to map pages as non-executable. Currently, our whole
memory is mapped as executable.

Signed-off-by: Stefan Teodorescu <stefanl.teodorescu@xxxxxxxxx>
---
 plat/kvm/x86/entry64.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/plat/kvm/x86/entry64.S b/plat/kvm/x86/entry64.S
index 274ab0b3..169f4c82 100644
--- a/plat/kvm/x86/entry64.S
+++ b/plat/kvm/x86/entry64.S
@@ -88,6 +88,7 @@ ENTRY(_libkvmplat_start32)
        movl $0xc0000080, %ecx
        rdmsr
        orl $X86_EFER_LME, %eax
+       orl $X86_EFER_NXE, %eax
        wrmsr

        /* 3: load pml4 pointer */
--
2.29.0