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

[p***@xen.org]

commit 27bd5ef5c8ac2791ee8bc8033ee8d994ec6a496f
Author: Andrew Cooper <***@citrix.com>
AuthorDate: Thu Oct 18 11:30:27 2018 +0100
Commit: Andrew Cooper <***@citrix.com>
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 <***@citrix.com>
Acked-by: Jan Beulich <***@suse.com>
---
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