[Xen-changelog] [xen staging] x86/cpuid: Tie SMAP to NX, for the shadow pagetable code

[patchbot@xxxxxxx]

commit 27bd5ef5c8ac2791ee8bc8033ee8d994ec6a496f
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Oct 18 11:30:27 2018 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Mon Nov 12 18:10:13 2018 +0000

    x86/cpuid: Tie SMAP to NX, for the shadow pagetable code
    
    NX support in the host is required for the shadow pagetable code to handle
    SMAP correctly for guests.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/tools/gen-cpuid.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/tools/gen-cpuid.py b/xen/tools/gen-cpuid.py
index 3fecae86d4..31fdee951e 100755
--- a/xen/tools/gen-cpuid.py
+++ b/xen/tools/gen-cpuid.py
@@ -239,6 +239,11 @@ def crunch_numbers(state):
         # absence of any enabled xstate.
         AVX: [FMA, FMA4, F16C, AVX2, XOP],
 
+        # This dependency exists solely for the shadow pagetable code.  If the
+        # host doesn't have NX support, the shadow pagetable code can't handle
+        # SMAP correctly for guests.
+        NX: [SMAP],
+
         # CX16 is only encodable in Long Mode.  LAHF_LM indicates that the
         # SAHF/LAHF instructions are reintroduced in Long Mode.  1GB
         # superpages, PCID and PKU are only available in 4 level paging.
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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