[Xen-devel] [PATCH v6 05/10] xen/arm: p2m: Extend p2m_lookup parameters to retrieve the p2m type

[Julien Grall <julien.grall@xxxxxxxxxx>]

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

---
    Changes in v6:
        - Add an ASSERT to check if p2mt != p2m_invalid
    Changes in v3:
        - 'p2mt' field was renamed in 'type'
        - missing one p2m_lookup
    Changes in v2:
        - This patch was "Add p2m_get_entry" on the previous version
        - Don't add a new function but only extend p2m_lookup
---
 xen/arch/arm/mm.c         |    2 +-
 xen/arch/arm/p2m.c        |   14 ++++++++++++--
 xen/arch/arm/traps.c      |    6 +++---
 xen/include/asm-arm/p2m.h |    2 +-
 4 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 654281a..b1222be 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1032,7 +1032,7 @@ static int xenmem_add_to_physmap_one(
             return rc;
         }
 
-        maddr = p2m_lookup(od, pfn_to_paddr(idx));
+        maddr = p2m_lookup(od, pfn_to_paddr(idx), NULL);
         if ( maddr == INVALID_PADDR )
         {
             dump_p2m_lookup(od, pfn_to_paddr(idx));
diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 3dda5c2..bc32935 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -72,11 +72,17 @@ static lpae_t *p2m_map_first(struct p2m_domain *p2m, 
paddr_t addr)
  * There are no processor functions to do a stage 2 only lookup therefore we
  * do a a software walk.
  */
-paddr_t p2m_lookup(struct domain *d, paddr_t paddr)
+paddr_t p2m_lookup(struct domain *d, paddr_t paddr, p2m_type_t *t)
 {
     struct p2m_domain *p2m = &d->arch.p2m;
     lpae_t pte, *first = NULL, *second = NULL, *third = NULL;
     paddr_t maddr = INVALID_PADDR;
+    p2m_type_t _t;
+
+    /* Allow t to be NULL */
+    t = t ?: &_t;
+
+    *t = p2m_invalid;
 
     spin_lock(&p2m->lock);
 
@@ -102,7 +108,11 @@ paddr_t p2m_lookup(struct domain *d, paddr_t paddr)
 
 done:
     if ( pte.p2m.valid )
+    {
+        ASSERT(pte.p2m.type != p2m_invalid);
         maddr = (pte.bits & PADDR_MASK & PAGE_MASK) | (paddr & ~PAGE_MASK);
+        *t = pte.p2m.type;
+    }
 
     if (third) unmap_domain_page(third);
     if (second) unmap_domain_page(second);
@@ -521,7 +531,7 @@ err:
 
 unsigned long gmfn_to_mfn(struct domain *d, unsigned long gpfn)
 {
-    paddr_t p = p2m_lookup(d, pfn_to_paddr(gpfn));
+    paddr_t p = p2m_lookup(d, pfn_to_paddr(gpfn), NULL);
     return p >> PAGE_SHIFT;
 }
 
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index e01045e..7c5ab19 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -1421,7 +1421,7 @@ void dump_guest_s1_walk(struct domain *d, vaddr_t addr)
     printk("dom%d VA 0x%08"PRIvaddr"\n", d->domain_id, addr);
     printk("    TTBCR: 0x%08"PRIregister"\n", ttbcr);
     printk("    TTBR0: 0x%016"PRIx64" = 0x%"PRIpaddr"\n",
-           ttbr0, p2m_lookup(d, ttbr0 & PAGE_MASK));
+           ttbr0, p2m_lookup(d, ttbr0 & PAGE_MASK, NULL));
 
     if ( ttbcr & TTBCR_EAE )
     {
@@ -1434,7 +1434,7 @@ void dump_guest_s1_walk(struct domain *d, vaddr_t addr)
         return;
     }
 
-    paddr = p2m_lookup(d, ttbr0 & PAGE_MASK);
+    paddr = p2m_lookup(d, ttbr0 & PAGE_MASK, NULL);
     if ( paddr == INVALID_PADDR )
     {
         printk("Failed TTBR0 maddr lookup\n");
@@ -1449,7 +1449,7 @@ void dump_guest_s1_walk(struct domain *d, vaddr_t addr)
          !(first[offset] & 0x2) )
         goto done;
 
-    paddr = p2m_lookup(d, first[offset] & PAGE_MASK);
+    paddr = p2m_lookup(d, first[offset] & PAGE_MASK, NULL);
 
     if ( paddr == INVALID_PADDR )
     {
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index 5742bbc..9d0d1e7 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -58,7 +58,7 @@ int p2m_alloc_table(struct domain *d);
 void p2m_load_VTTBR(struct domain *d);
 
 /* Look up the MFN corresponding to a domain's PFN. */
-paddr_t p2m_lookup(struct domain *d, paddr_t gpfn);
+paddr_t p2m_lookup(struct domain *d, paddr_t gpfn, p2m_type_t *t);
 
 /* Setup p2m RAM mapping for domain d from start-end. */
 int p2m_populate_ram(struct domain *d, paddr_t start, paddr_t end);
-- 
1.7.10.4


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