[PATCH RFC v12 12/21] pvh: Support guest_kernel_mode for PVH

[George Dunlap <george.dunlap@eu.citrix.com>]

This will be requred in order to do emulated_privops for PVH.

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
CC: Jan Beulich <jan.beulich@suse.com>
CC: Tim Deegan <tim@xen.org>
CC: Keir Fraser <keir@xen.org>
---
 xen/arch/x86/hvm/hvm.c            |    8 ++++++++
 xen/arch/x86/x86_64/traps.c       |    2 +-
 xen/include/asm-x86/domain.h      |    2 +-
 xen/include/asm-x86/x86_64/regs.h |   11 +++++++----
 4 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index a61a4a6..8b87271 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -4717,6 +4717,14 @@ enum hvm_intblk nhvm_interrupt_blocked(struct vcpu *v)
     return hvm_funcs.nhvm_intr_blocked(v);
 }
 
+bool_t hvm_kernel_mode(struct vcpu *v)
+{
+    struct segment_register seg;
+
+    hvm_get_segment_register(v, x86_seg_ss, &seg);
+    return (seg.attr.fields.dpl == 0);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/x86/x86_64/traps.c b/xen/arch/x86/x86_64/traps.c
index ef5c470..8644aaf 100644
--- a/xen/arch/x86/x86_64/traps.c
+++ b/xen/arch/x86/x86_64/traps.c
@@ -142,7 +142,7 @@ void show_registers(struct cpu_user_regs *regs)
     }
 }
 
-void vcpu_show_registers(const struct vcpu *v)
+void vcpu_show_registers(struct vcpu *v)
 {
     const struct cpu_user_regs *regs = &v->arch.user_regs;
     unsigned long crs[8];
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index 23923df..ea7074c 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -447,7 +447,7 @@ struct arch_vcpu
 #define hvm_svm         hvm_vcpu.u.svm
 
 void vcpu_show_execution_state(struct vcpu *);
-void vcpu_show_registers(const struct vcpu *);
+void vcpu_show_registers(struct vcpu *);
 
 /* Clean up CR4 bits that are not under guest control. */
 unsigned long pv_guest_cr4_fixup(const struct vcpu *, unsigned long guest_cr4);
diff --git a/xen/include/asm-x86/x86_64/regs.h b/xen/include/asm-x86/x86_64/regs.h
index 3cdc702..d91a84b 100644
--- a/xen/include/asm-x86/x86_64/regs.h
+++ b/xen/include/asm-x86/x86_64/regs.h
@@ -10,10 +10,13 @@
 #define ring_2(r)    (((r)->cs & 3) == 2)
 #define ring_3(r)    (((r)->cs & 3) == 3)
 
-#define guest_kernel_mode(v, r)                                 \
-    (!is_pv_32bit_vcpu(v) ?                                     \
-     (ring_3(r) && ((v)->arch.flags & TF_kernel_mode)) :        \
-     (ring_1(r)))
+bool_t hvm_kernel_mode(struct vcpu *);
+
+#define guest_kernel_mode(v, r)                                   \
+    (is_pvh_vcpu(v) ? hvm_kernel_mode(v) :                        \
+     (!is_pv_32bit_vcpu(v) ?                                      \
+      (ring_3(r) && ((v)->arch.flags & TF_kernel_mode)) :         \
+      (ring_1(r))))
 
 #define permit_softint(dpl, v, r) \
     ((dpl) >= (guest_kernel_mode(v, r) ? 1 : 3))
-- 
1.7.9.5