[Xen-devel] [PATCH v2 Altp2m cleanup 2/3] Move altp2m specific functions to altp2m files.

[Paul Lai <paul.c.lai@xxxxxxxxx>]

Move altp2m specific functions to altp2m files.  This makes the code
a little easier to read.

Also moving ept code to ept specific files as requested in:
  https://lists.xenproject.org/archives/html/xen-devel/2015-07/msg04323.html

Signed-off-by: Paul Lai <paul.c.lai@xxxxxxxxx>
---
 xen/arch/x86/mm/altp2m.c          | 45 +++++++++++++++++++++++++++++++++++++++
 xen/arch/x86/mm/hap/hap.c         | 35 +++++-------------------------
 xen/arch/x86/mm/p2m-ept.c         | 39 +++++++++++++++++++++++++++++++++
 xen/arch/x86/mm/p2m.c             | 45 +++------------------------------------
 xen/include/asm-x86/altp2m.h      |  4 +++-
 xen/include/asm-x86/hvm/vmx/vmx.h |  3 +++
 xen/include/asm-x86/p2m.h         |  9 +++-----
 7 files changed, 101 insertions(+), 79 deletions(-)

diff --git a/xen/arch/x86/mm/altp2m.c b/xen/arch/x86/mm/altp2m.c
index 10605c8..ec812dd 100644
--- a/xen/arch/x86/mm/altp2m.c
+++ b/xen/arch/x86/mm/altp2m.c
@@ -17,6 +17,7 @@
 
 #include <asm/hvm/support.h>
 #include <asm/hvm/hvm.h>
+#include <asm/domain.h>
 #include <asm/p2m.h>
 #include <asm/altp2m.h>
 
@@ -65,6 +66,50 @@ altp2m_vcpu_destroy(struct vcpu *v)
         vcpu_unpause(v);
 }
 
+int
+hvm_altp2m_init( struct domain *d)
+{
+    int rc = 0;
+    unsigned int i = 0;
+
+    /* Init alternate p2m data. */
+    if ( (d->arch.altp2m_eptp = alloc_xenheap_page()) == NULL )
+    {
+        rc = -ENOMEM;
+        goto out;
+    }
+
+    for ( i = 0; i < MAX_EPTP; i++ )
+        d->arch.altp2m_eptp[i] = INVALID_MFN;
+
+    for ( i = 0; i < MAX_ALTP2M; i++ )
+    {
+        rc = p2m_alloc_table(d->arch.altp2m_p2m[i]);
+        if ( rc != 0 )
+           goto out;
+    }
+
+    d->arch.altp2m_active = 0;
+ out:
+    return rc;
+}
+
+void
+hvm_altp2m_teardown( struct domain *d)
+{
+    unsigned int i = 0;
+    d->arch.altp2m_active = 0;
+
+    if ( d->arch.altp2m_eptp )
+    {
+        free_xenheap_page(d->arch.altp2m_eptp);
+        d->arch.altp2m_eptp = NULL;
+    }
+
+    for ( i = 0; i < MAX_ALTP2M; i++ )
+        p2m_teardown(d->arch.altp2m_p2m[i]);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c
index 9c2cd49..07833b7 100644
--- a/xen/arch/x86/mm/hap/hap.c
+++ b/xen/arch/x86/mm/hap/hap.c
@@ -37,6 +37,7 @@
 #include <asm/hap.h>
 #include <asm/paging.h>
 #include <asm/p2m.h>
+#include <asm/altp2m.h>
 #include <asm/domain.h>
 #include <xen/numa.h>
 #include <asm/hvm/nestedhvm.h>
@@ -501,24 +502,9 @@ int hap_enable(struct domain *d, u32 mode)
 
     if ( hvm_altp2m_supported() )
     {
-        /* Init alternate p2m data */
-        if ( (d->arch.altp2m_eptp = alloc_xenheap_page()) == NULL )
-        {
-            rv = -ENOMEM;
-            goto out;
-        }
-
-        for ( i = 0; i < MAX_EPTP; i++ )
-            d->arch.altp2m_eptp[i] = INVALID_MFN;
-
-        for ( i = 0; i < MAX_ALTP2M; i++ )
-        {
-            rv = p2m_alloc_table(d->arch.altp2m_p2m[i]);
-            if ( rv != 0 )
-               goto out;
-        }
-
-        d->arch.altp2m_active = 0;
+        rv = hvm_altp2m_init(d);
+        if ( rv != 0 )
+           goto out;
     }
 
     /* Now let other users see the new mode */
@@ -534,18 +520,7 @@ void hap_final_teardown(struct domain *d)
     unsigned int i;
 
     if ( hvm_altp2m_supported() )
-    {
-        d->arch.altp2m_active = 0;
-
-        if ( d->arch.altp2m_eptp )
-        {
-            free_xenheap_page(d->arch.altp2m_eptp);
-            d->arch.altp2m_eptp = NULL;
-        }
-
-        for ( i = 0; i < MAX_ALTP2M; i++ )
-            p2m_teardown(d->arch.altp2m_p2m[i]);
-    }
+        hvm_altp2m_teardown(d);
 
     /* Destroy nestedp2m's first */
     for (i = 0; i < MAX_NESTEDP2M; i++) {
diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c
index 7166c71..b68806d 100644
--- a/xen/arch/x86/mm/p2m-ept.c
+++ b/xen/arch/x86/mm/p2m-ept.c
@@ -1329,6 +1329,45 @@ void setup_ept_dump(void)
     register_keyhandler('D', ept_dump_p2m_table, "dump VT-x EPT tables", 0);
 }
 
+void p2m_init_altp2m_ept_helper( struct domain *d, unsigned int i)
+{
+    struct p2m_domain *p2m = d->arch.altp2m_p2m[i];
+    struct ept_data *ept;
+
+    p2m->min_remapped_gfn = INVALID_GFN;
+    p2m->max_remapped_gfn = 0;
+    ept = &p2m->ept;
+    ept->asr = pagetable_get_pfn(p2m_get_pagetable(p2m));
+    d->arch.altp2m_eptp[i] = ept_get_eptp(ept);
+}
+
+unsigned int p2m_find_altp2m_by_eptp(struct domain *d, uint64_t eptp)
+{
+    struct p2m_domain *p2m;
+    struct ept_data *ept;
+    unsigned int i;
+
+    altp2m_list_lock(d);
+
+    for ( i = 0; i < MAX_ALTP2M; i++ )
+    {
+        if ( d->arch.altp2m_eptp[i] == INVALID_MFN )
+            continue;
+
+        p2m = d->arch.altp2m_p2m[i];
+        ept = &p2m->ept;
+
+        if ( eptp == ept_get_eptp(ept) )
+            goto out;
+    }
+
+    i = INVALID_ALTP2M;
+
+ out:
+    altp2m_list_unlock(d);
+    return i;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 89462b2..b48cf4b 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -196,8 +196,8 @@ static void p2m_teardown_altp2m(struct domain *d)
         if ( !d->arch.altp2m_p2m[i] )
             continue;
         p2m = d->arch.altp2m_p2m[i];
-        d->arch.altp2m_p2m[i] = NULL;
         p2m_free_one(p2m);
+        d->arch.altp2m_p2m[i] = NULL;
     }
 }
 
@@ -2270,33 +2270,6 @@ int unmap_mmio_regions(struct domain *d,
     return i == nr ? 0 : i ?: ret;
 }
 
-unsigned int p2m_find_altp2m_by_eptp(struct domain *d, uint64_t eptp)
-{
-    struct p2m_domain *p2m;
-    struct ept_data *ept;
-    unsigned int i;
-
-    altp2m_list_lock(d);
-
-    for ( i = 0; i < MAX_ALTP2M; i++ )
-    {
-        if ( d->arch.altp2m_eptp[i] == INVALID_MFN )
-            continue;
-
-        p2m = d->arch.altp2m_p2m[i];
-        ept = &p2m->ept;
-
-        if ( eptp == ept_get_eptp(ept) )
-            goto out;
-    }
-
-    i = INVALID_ALTP2M;
-
- out:
-    altp2m_list_unlock(d);
-    return i;
-}
-
 bool_t p2m_switch_vcpu_altp2m_by_id(struct vcpu *v, unsigned int idx)
 {
     struct domain *d = v->domain;
@@ -2402,18 +2375,6 @@ void p2m_flush_altp2m(struct domain *d)
     altp2m_list_unlock(d);
 }
 
-static void p2m_init_altp2m_helper(struct domain *d, unsigned int i)
-{
-    struct p2m_domain *p2m = d->arch.altp2m_p2m[i];
-    struct ept_data *ept;
-
-    p2m->min_remapped_gfn = INVALID_GFN;
-    p2m->max_remapped_gfn = 0;
-    ept = &p2m->ept;
-    ept->asr = pagetable_get_pfn(p2m_get_pagetable(p2m));
-    d->arch.altp2m_eptp[i] = ept_get_eptp(ept);
-}
-
 int p2m_init_altp2m_by_id(struct domain *d, unsigned int idx)
 {
     int rc = -EINVAL;
@@ -2425,7 +2386,7 @@ int p2m_init_altp2m_by_id(struct domain *d, unsigned int 
idx)
 
     if ( d->arch.altp2m_eptp[idx] == INVALID_MFN )
     {
-        p2m_init_altp2m_helper(d, idx);
+        p2m_init_altp2m_ept_helper(d, idx);
         rc = 0;
     }
 
@@ -2445,7 +2406,7 @@ int p2m_init_next_altp2m(struct domain *d, uint16_t *idx)
         if ( d->arch.altp2m_eptp[i] != INVALID_MFN )
             continue;
 
-        p2m_init_altp2m_helper(d, i);
+        p2m_init_altp2m_ept_helper(d, i);
         *idx = i;
         rc = 0;
 
diff --git a/xen/include/asm-x86/altp2m.h b/xen/include/asm-x86/altp2m.h
index 64c7618..a236ed7 100644
--- a/xen/include/asm-x86/altp2m.h
+++ b/xen/include/asm-x86/altp2m.h
@@ -18,7 +18,6 @@
 #ifndef __ASM_X86_ALTP2M_H
 #define __ASM_X86_ALTP2M_H
 
-#include <xen/types.h>
 #include <xen/sched.h>         /* for struct vcpu, struct domain */
 #include <asm/hvm/vcpu.h>      /* for vcpu_altp2m */
 
@@ -38,4 +37,7 @@ static inline uint16_t altp2m_vcpu_idx(const struct vcpu *v)
     return vcpu_altp2m(v).p2midx;
 }
 
+int hvm_altp2m_init(struct domain *d);
+void hvm_altp2m_teardown(struct domain *d);
+
 #endif /* __ASM_X86_ALTP2M_H */
diff --git a/xen/include/asm-x86/hvm/vmx/vmx.h 
b/xen/include/asm-x86/hvm/vmx/vmx.h
index 359b2a9..5b495a2 100644
--- a/xen/include/asm-x86/hvm/vmx/vmx.h
+++ b/xen/include/asm-x86/hvm/vmx/vmx.h
@@ -556,6 +556,9 @@ void ept_p2m_uninit(struct p2m_domain *p2m);
 void ept_walk_table(struct domain *d, unsigned long gfn);
 bool_t ept_handle_misconfig(uint64_t gpa);
 void setup_ept_dump(void);
+void p2m_init_altp2m_ept_helper( struct domain *d, unsigned int i);
+/* Locate an alternate p2m by its EPTP */
+unsigned int p2m_find_altp2m_by_eptp(struct domain *d, uint64_t eptp);
 
 void update_guest_eip(void);
 
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index 65675a2..d7c8c12 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -23,8 +23,8 @@
  * along with this program; If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _XEN_P2M_H
-#define _XEN_P2M_H
+#ifndef _XEN_ASM_X86_P2M_H
+#define _XEN_ASM_X86_P2M_H
 
 #include <xen/config.h>
 #include <xen/paging.h>
@@ -779,9 +779,6 @@ static inline struct p2m_domain *p2m_get_altp2m(struct vcpu 
*v)
     return v->domain->arch.altp2m_p2m[index];
 }
 
-/* Locate an alternate p2m by its EPTP */
-unsigned int p2m_find_altp2m_by_eptp(struct domain *d, uint64_t eptp);
-
 /* Switch alternate p2m for a single vcpu */
 bool_t p2m_switch_vcpu_altp2m_by_id(struct vcpu *v, unsigned int idx);
 
@@ -843,7 +840,7 @@ static inline unsigned int p2m_get_iommu_flags(p2m_type_t 
p2mt)
     return flags;
 }
 
-#endif /* _XEN_P2M_H */
+#endif /* _XEN_ASM_X86_P2M_H */
 
 /*
  * Local variables:
-- 
2.7.4


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