x86_64 hvm: Adjust COMPAT_VIRT_START for 32-bit HVM guests.

The PV limit should not apply as there is no M2P table mapped into an
HVM guest's virtual address space.

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 80c6bd4a573356ccc7809fccfd278dfb6b62e103..d0eaba2f8ff6a62aaf5b49ff10ec4c83f9b27f90 100644 (file)
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -448,7 +448,8 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags)
 #endif /* __x86_64__ */
 
 #ifdef CONFIG_COMPAT
-    HYPERVISOR_COMPAT_VIRT_START(d) = __HYPERVISOR_COMPAT_VIRT_START;
+    HYPERVISOR_COMPAT_VIRT_START(d) =
+        is_hvm_domain(d) ? ~0u : __HYPERVISOR_COMPAT_VIRT_START;
 #endif
 
     if ( (rc = paging_domain_init(d)) != 0 )