[PATCH v4 2/4] x86/compat: Test both PV and PVH guests for compat mode

[Boris Ostrovsky <boris.ostrovsky@oracle.com>]

Add is_pvh_32bit_domain() macro and use it alongside is_pv_32bit_domain() where
necessary.

Since PVH guests cannot change execution mode, has_32bit_shinfo is a good
indicator of whether the guest is PVH and 32-bit.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---
 xen/arch/x86/domain.c        | 6 +++---
 xen/arch/x86/domctl.c        | 5 +++--
 xen/include/asm-x86/domain.h | 1 +
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 7fa8b9c..327b13f 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -358,7 +358,7 @@ int switch_native(struct domain *d)
 
     if ( !may_switch_mode(d) )
         return -EACCES;
-    if ( !is_pv_32bit_domain(d) )
+    if ( !is_pv_32bit_domain(d) && !is_pvh_32bit_domain(d) )
         return 0;
 
     d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 0;
@@ -383,7 +383,7 @@ int switch_compat(struct domain *d)
 
     if ( !may_switch_mode(d) )
         return -EACCES;
-    if ( is_pv_32bit_domain(d) )
+    if ( is_pv_32bit_domain(d) || is_pvh_32bit_domain(d) )
         return 0;
 
     d->arch.has_32bit_shinfo = 1;
@@ -777,7 +777,7 @@ int arch_set_info_guest(
 
     /* The context is a compat-mode one if the target domain is compat-mode;
      * we expect the tools to DTRT even in compat-mode callers. */
-    compat = is_pv_32bit_domain(d);
+    compat = is_pv_32bit_domain(d) || is_pvh_32bit_domain(d);
 
 #define c(fld) (compat ? (c.cmp->fld) : (c.nat->fld))
     flags = c(flags);
diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index bf62a88..6172c0d 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -349,7 +349,8 @@ long arch_do_domctl(
 
     case XEN_DOMCTL_get_address_size:
         domctl->u.address_size.size =
-            is_pv_32bit_domain(d) ? 32 : BITS_PER_LONG;
+            (is_pv_32bit_domain(d) || is_pvh_32bit_domain(d)) ?
+            32 : BITS_PER_LONG;
         copyback = 1;
         break;
 
@@ -1203,7 +1204,7 @@ void arch_get_info_guest(struct vcpu *v, vcpu_guest_context_u c)
 {
     unsigned int i;
     const struct domain *d = v->domain;
-    bool_t compat = is_pv_32bit_domain(d);
+    bool_t compat = is_pv_32bit_domain(d) || is_pvh_32bit_domain(d);
 #define c(fld) (!compat ? (c.nat->fld) : (c.cmp->fld))
 
     if ( !is_pv_domain(d) )
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index 0fce09e..6f73d08 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -14,6 +14,7 @@
 #define has_32bit_shinfo(d)    ((d)->arch.has_32bit_shinfo)
 #define is_pv_32bit_domain(d)  ((d)->arch.is_32bit_pv)
 #define is_pv_32bit_vcpu(v)    (is_pv_32bit_domain((v)->domain))
+#define is_pvh_32bit_domain(d) (is_pvh_domain(d) && has_32bit_shinfo(d))
 
 #define is_hvm_pv_evtchn_domain(d) (has_hvm_container_domain(d) && \
         d->arch.hvm_domain.irq.callback_via_type == HVMIRQ_callback_vector)
-- 
1.8.1.4