[PATCH V6 06/24] xen/ioreq: Make x86's hvm_mmio_first(last)_byte() common

[Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>]

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>

The IOREQ is a common feature now and these helpers will be used
on Arm as is. Move them to xen/ioreq.h and replace "hvm" prefixes
with "ioreq".

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
Reviewed-by: Paul Durrant <paul@xxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Alex Bennée <alex.bennee@xxxxxxxxxx>
CC: Julien Grall <julien.grall@xxxxxxx>
[On Arm only]
Tested-by: Wei Chen <Wei.Chen@xxxxxxx>

---
Please note, this is a split/cleanup/hardening of Julien's PoC:
"Add support for Guest IO forwarding to a device emulator"

Changes RFC -> V1:
   - new patch

Changes V1 -> V2:
   - replace "hvm" prefix by "ioreq"

Changes V2 -> V3:
   - add Paul's R-b

Changes V3 -> V4:
   - add Jan's A-b

Changes V4 -> V5:
   - rebase
   - add Julien's and Alex's R-b

Changes V5 -> V6:
   - no changes

---
---
 xen/arch/x86/hvm/intercept.c |  5 +++--
 xen/arch/x86/hvm/stdvga.c    |  4 ++--
 xen/common/ioreq.c           |  4 ++--
 xen/include/asm-x86/hvm/io.h | 16 ----------------
 xen/include/xen/ioreq.h      | 16 ++++++++++++++++
 5 files changed, 23 insertions(+), 22 deletions(-)

diff --git a/xen/arch/x86/hvm/intercept.c b/xen/arch/x86/hvm/intercept.c
index cd4c4c1..02ca3b0 100644
--- a/xen/arch/x86/hvm/intercept.c
+++ b/xen/arch/x86/hvm/intercept.c
@@ -17,6 +17,7 @@
  * this program; If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <xen/ioreq.h>
 #include <xen/types.h>
 #include <xen/sched.h>
 #include <asm/regs.h>
@@ -34,7 +35,7 @@
 static bool_t hvm_mmio_accept(const struct hvm_io_handler *handler,
                               const ioreq_t *p)
 {
-    paddr_t first = hvm_mmio_first_byte(p), last;
+    paddr_t first = ioreq_mmio_first_byte(p), last;
 
     BUG_ON(handler->type != IOREQ_TYPE_COPY);
 
@@ -42,7 +43,7 @@ static bool_t hvm_mmio_accept(const struct hvm_io_handler 
*handler,
         return 0;
 
     /* Make sure the handler will accept the whole access. */
-    last = hvm_mmio_last_byte(p);
+    last = ioreq_mmio_last_byte(p);
     if ( last != first &&
          !handler->mmio.ops->check(current, last) )
         domain_crash(current->domain);
diff --git a/xen/arch/x86/hvm/stdvga.c b/xen/arch/x86/hvm/stdvga.c
index fd7cadb..17dee74 100644
--- a/xen/arch/x86/hvm/stdvga.c
+++ b/xen/arch/x86/hvm/stdvga.c
@@ -524,8 +524,8 @@ static bool_t stdvga_mem_accept(const struct hvm_io_handler 
*handler,
      * deadlock when hvm_mmio_internal() is called from
      * hvm_copy_to/from_guest_phys() in hvm_process_io_intercept().
      */
-    if ( (hvm_mmio_first_byte(p) < VGA_MEM_BASE) ||
-         (hvm_mmio_last_byte(p) >= (VGA_MEM_BASE + VGA_MEM_SIZE)) )
+    if ( (ioreq_mmio_first_byte(p) < VGA_MEM_BASE) ||
+         (ioreq_mmio_last_byte(p) >= (VGA_MEM_BASE + VGA_MEM_SIZE)) )
         return 0;
 
     spin_lock(&s->lock);
diff --git a/xen/common/ioreq.c b/xen/common/ioreq.c
index 61ddd54..89e75ff 100644
--- a/xen/common/ioreq.c
+++ b/xen/common/ioreq.c
@@ -1078,8 +1078,8 @@ struct hvm_ioreq_server *hvm_select_ioreq_server(struct 
domain *d,
             break;
 
         case XEN_DMOP_IO_RANGE_MEMORY:
-            start = hvm_mmio_first_byte(p);
-            end = hvm_mmio_last_byte(p);
+            start = ioreq_mmio_first_byte(p);
+            end = ioreq_mmio_last_byte(p);
 
             if ( rangeset_contains_range(r, start, end) )
                 return s;
diff --git a/xen/include/asm-x86/hvm/io.h b/xen/include/asm-x86/hvm/io.h
index 3d2e877..3a4a739 100644
--- a/xen/include/asm-x86/hvm/io.h
+++ b/xen/include/asm-x86/hvm/io.h
@@ -40,22 +40,6 @@ struct hvm_mmio_ops {
     hvm_mmio_write_t write;
 };
 
-static inline paddr_t hvm_mmio_first_byte(const ioreq_t *p)
-{
-    return unlikely(p->df) ?
-           p->addr - (p->count - 1ul) * p->size :
-           p->addr;
-}
-
-static inline paddr_t hvm_mmio_last_byte(const ioreq_t *p)
-{
-    unsigned long size = p->size;
-
-    return unlikely(p->df) ?
-           p->addr + size - 1:
-           p->addr + (p->count * size) - 1;
-}
-
 typedef int (*portio_action_t)(
     int dir, unsigned int port, unsigned int bytes, uint32_t *val);
 
diff --git a/xen/include/xen/ioreq.h b/xen/include/xen/ioreq.h
index e957b52..6853aa3 100644
--- a/xen/include/xen/ioreq.h
+++ b/xen/include/xen/ioreq.h
@@ -23,6 +23,22 @@
 
 #include <public/hvm/dm_op.h>
 
+static inline paddr_t ioreq_mmio_first_byte(const ioreq_t *p)
+{
+    return unlikely(p->df) ?
+           p->addr - (p->count - 1ul) * p->size :
+           p->addr;
+}
+
+static inline paddr_t ioreq_mmio_last_byte(const ioreq_t *p)
+{
+    unsigned long size = p->size;
+
+    return unlikely(p->df) ?
+           p->addr + size - 1:
+           p->addr + (p->count * size) - 1;
+}
+
 static inline bool ioreq_needs_completion(const ioreq_t *ioreq)
 {
     return ioreq->state == STATE_IOREQ_READY &&
-- 
2.7.4