[Xen-devel] [PATCH v8 8/8] Revert "xen: introduce arch_grant_(un)map_page_identity"

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

This reverts commit e25a5f4d8cf3b55718048abdd21c7d0de64ae54c.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/p2m.c                 |   26 --------------------------
 xen/drivers/passthrough/arm/smmu.c |   13 +++++++++++--
 xen/include/asm-arm/p2m.h          |    4 ----
 xen/include/asm-x86/p2m.h          |    4 ----
 4 files changed, 11 insertions(+), 36 deletions(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 20bcc9e..6b7569a 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -982,32 +982,6 @@ void guest_physmap_remove_page(struct domain *d,
                       pfn_to_paddr(mfn), MATTR_MEM, p2m_invalid);
 }
 
-int arch_grant_map_page_identity(struct domain *d, unsigned long frame,
-                                 bool_t writeable)
-{
-    p2m_type_t t;
-
-    ASSERT(is_domain_direct_mapped(d));
-
-    /* This is not an IOMMU mapping but it is not a regular RAM p2m type
-     * either. We are using IOMMU p2m types here to prevent the pages
-     * from being used as grants. */
-    if ( writeable )
-        t = p2m_iommu_map_rw;
-    else
-        t = p2m_iommu_map_ro;
-
-    return guest_physmap_add_entry(d, frame, frame, 0, t);
-}
-
-int arch_grant_unmap_page_identity(struct domain *d, unsigned long frame)
-{
-    ASSERT(is_domain_direct_mapped(d));
-
-    guest_physmap_remove_page(d, frame, frame, 0);
-    return 0;
-}
-
 int p2m_alloc_table(struct domain *d)
 {
     struct p2m_domain *p2m = &d->arch.p2m;
diff --git a/xen/drivers/passthrough/arm/smmu.c 
b/xen/drivers/passthrough/arm/smmu.c
index 9a95ac9..42bde75 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -1539,6 +1539,8 @@ static void arm_smmu_iommu_domain_teardown(struct domain 
*d)
 static int arm_smmu_map_page(struct domain *d, unsigned long gfn,
                              unsigned long mfn, unsigned int flags)
 {
+    p2m_type_t t;
+
     /* Grant mappings can be used for DMA requests. The dev_bus_addr returned 
by
      * the hypercall is the MFN (not the IPA). For device protected by
      * an IOMMU, Xen needs to add a 1:1 mapping in the domain p2m to
@@ -1553,7 +1555,12 @@ static int arm_smmu_map_page(struct domain *d, unsigned 
long gfn,
     if ( !(flags & (IOMMUF_readable | IOMMUF_writable)) )
         return -EINVAL;
 
-    return arch_grant_map_page_identity(d, mfn, flags & IOMMUF_writable);
+    t = (flags & IOMMUF_writable) ? p2m_iommu_map_rw : p2m_iommu_map_ro;
+
+    /* The function guest_physmap_add_entry replaces the current mapping
+     * if there is already one...
+     */
+    return guest_physmap_add_entry(d, gfn, mfn, 0, t);
 }
 
 static int arm_smmu_unmap_page(struct domain *d, unsigned long gfn)
@@ -1564,7 +1571,9 @@ static int arm_smmu_unmap_page(struct domain *d, unsigned 
long gfn)
     if ( !is_domain_direct_mapped(d) )
         return -EINVAL;
 
-    return arch_grant_unmap_page_identity(d, gfn);
+    guest_physmap_remove_page(d, gfn, gfn, 0);
+
+    return 0;
 }
 
 static const struct iommu_ops arm_smmu_iommu_ops = {
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index 10bf111..da36504 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -214,10 +214,6 @@ static inline int get_page_and_type(struct page_info *page,
     return rc;
 }
 
-int arch_grant_map_page_identity(struct domain *d, unsigned long frame,
-                                 bool_t writeable);
-int arch_grant_unmap_page_identity(struct domain *d, unsigned long frame);
-
 /* get host p2m table */
 #define p2m_get_hostp2m(d) (&(d)->arch.p2m)
 
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index 90ddd15..5f7fe71 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -709,10 +709,6 @@ static inline unsigned int p2m_get_iommu_flags(p2m_type_t 
p2mt)
     return flags;
 }
 
-extern int arch_grant_map_page_identity(struct domain *d, unsigned long frame,
-                                 bool_t writeable);
-extern int arch_grant_unmap_page_identity(struct domain *d, unsigned long 
frame);
-
 #endif /* _XEN_P2M_H */
 
 /*
-- 
1.7.10.4


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