[Xen-devel] [PATCH v2 3/6] x86/hvm/domain: remove the 'hap_enabled' flag

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

The hap_enabled() macro can determine whether the feature is available
using the domain 'options'; there is no need for a separate flag.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>
Cc: "Roger Pau Monné" <roger.pau@xxxxxxxxxx>

v2:
 - Defer changes to shadow_domain_init() to patch #4
---
 xen/arch/x86/domain.c            | 7 +------
 xen/arch/x86/mm/paging.c         | 4 ++--
 xen/include/asm-x86/hvm/domain.h | 9 +++------
 xen/include/asm-x86/paging.h     | 2 +-
 4 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index ea55160887..65f47a7627 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -564,12 +564,7 @@ int arch_domain_create(struct domain *d,
     HYPERVISOR_COMPAT_VIRT_START(d) =
         is_pv_domain(d) ? __HYPERVISOR_COMPAT_VIRT_START : ~0u;
 
-    /* Need to determine if HAP is enabled before initialising paging */
-    if ( is_hvm_domain(d) )
-        d->arch.hvm.hap_enabled =
-            hvm_hap_supported() && (config->flags & XEN_DOMCTL_CDF_hap);
-
-    if ( (rc = paging_domain_init(d, config->flags)) != 0 )
+    if ( (rc = paging_domain_init(d)) != 0 )
         goto fail;
     paging_initialised = true;
 
diff --git a/xen/arch/x86/mm/paging.c b/xen/arch/x86/mm/paging.c
index 011089368a..097a27f608 100644
--- a/xen/arch/x86/mm/paging.c
+++ b/xen/arch/x86/mm/paging.c
@@ -632,7 +632,7 @@ void paging_log_dirty_init(struct domain *d, const struct 
log_dirty_ops *ops)
 /*           CODE FOR PAGING SUPPORT            */
 /************************************************/
 /* Domain paging struct initialization. */
-int paging_domain_init(struct domain *d, unsigned int domcr_flags)
+int paging_domain_init(struct domain *d)
 {
     int rc;
 
@@ -653,7 +653,7 @@ int paging_domain_init(struct domain *d, unsigned int 
domcr_flags)
     if ( hap_enabled(d) )
         hap_domain_init(d);
     else
-        rc = shadow_domain_init(d, domcr_flags);
+        rc = shadow_domain_init(d, d->options);
 
     return rc;
 }
diff --git a/xen/include/asm-x86/hvm/domain.h b/xen/include/asm-x86/hvm/domain.h
index 6c7c4f5aa6..7897e36b94 100644
--- a/xen/include/asm-x86/hvm/domain.h
+++ b/xen/include/asm-x86/hvm/domain.h
@@ -156,7 +156,6 @@ struct hvm_domain {
 
     struct viridian_domain *viridian;
 
-    bool_t                 hap_enabled;
     bool_t                 mem_sharing_enabled;
     bool_t                 qemu_mapcache_invalidate;
     bool_t                 is_s3_suspended;
@@ -195,11 +194,9 @@ struct hvm_domain {
     };
 };
 
-#ifdef CONFIG_HVM
-#define hap_enabled(d)  (is_hvm_domain(d) && (d)->arch.hvm.hap_enabled)
-#else
-#define hap_enabled(d)  ({(void)(d); false;})
-#endif
+#define hap_enabled(d) \
+    (hvm_hap_supported() && is_hvm_domain(d) && \
+     evaluate_nospec(d->options & XEN_DOMCTL_CDF_hap))
 
 #endif /* __ASM_X86_HVM_DOMAIN_H__ */
 
diff --git a/xen/include/asm-x86/paging.h b/xen/include/asm-x86/paging.h
index cf57ca708d..ab7887f23c 100644
--- a/xen/include/asm-x86/paging.h
+++ b/xen/include/asm-x86/paging.h
@@ -207,7 +207,7 @@ void paging_vcpu_init(struct vcpu *v);
 
 /* Set up the paging-assistance-specific parts of a domain struct at
  * start of day.  Called for every domain from arch_domain_create() */
-int paging_domain_init(struct domain *d, unsigned int domcr_flags);
+int paging_domain_init(struct domain *d);
 
 /* Handler for paging-control ops: operations from user-space to enable
  * and disable ephemeral shadow modes (test mode and log-dirty mode) and
-- 
2.20.1.2.gb21ebb671


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