[PATCH V3 05/23] xen/ioreq: Make x86's hvm_ioreq_needs_completion() common

[Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>]

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>

The IOREQ is a common feature now and this helper will be used
on Arm as is. Move it to xen/ioreq.h and remove "hvm" prefix.

Although PIO handling on Arm is not introduced with the current series
(it will be implemented when we add support for vPCI), technically
the PIOs exist on Arm (however they are accessed the same way as MMIO)
and it would be better not to diverge now.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
Reviewed-by: Paul Durrant <paul@xxxxxxx>
CC: Julien Grall <julien.grall@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, was split from:
     "[RFC PATCH V1 01/12] hvm/ioreq: Make x86's IOREQ feature common"

Changes V1 -> V2:
   - remove "hvm" prefix

Changes V2 -> V3:
   - add Paul's R-b
---
---
 xen/arch/x86/hvm/emulate.c     | 4 ++--
 xen/arch/x86/hvm/io.c          | 2 +-
 xen/common/ioreq.c             | 4 ++--
 xen/include/asm-x86/hvm/vcpu.h | 7 -------
 xen/include/xen/ioreq.h        | 7 +++++++
 5 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
index 24cf85f..5700274 100644
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -336,7 +336,7 @@ static int hvmemul_do_io(
             rc = hvm_send_ioreq(s, &p, 0);
             if ( rc != X86EMUL_RETRY || currd->is_shutting_down )
                 vio->io_req.state = STATE_IOREQ_NONE;
-            else if ( !hvm_ioreq_needs_completion(&vio->io_req) )
+            else if ( !ioreq_needs_completion(&vio->io_req) )
                 rc = X86EMUL_OKAY;
         }
         break;
@@ -2649,7 +2649,7 @@ static int _hvm_emulate_one(struct hvm_emulate_ctxt 
*hvmemul_ctxt,
     if ( rc == X86EMUL_OKAY && vio->mmio_retry )
         rc = X86EMUL_RETRY;
 
-    if ( !hvm_ioreq_needs_completion(&vio->io_req) )
+    if ( !ioreq_needs_completion(&vio->io_req) )
         completion = HVMIO_no_completion;
     else if ( completion == HVMIO_no_completion )
         completion = (vio->io_req.type != IOREQ_TYPE_PIO ||
diff --git a/xen/arch/x86/hvm/io.c b/xen/arch/x86/hvm/io.c
index 3e09d9b..b220d6b 100644
--- a/xen/arch/x86/hvm/io.c
+++ b/xen/arch/x86/hvm/io.c
@@ -135,7 +135,7 @@ bool handle_pio(uint16_t port, unsigned int size, int dir)
 
     rc = hvmemul_do_pio_buffer(port, size, dir, &data);
 
-    if ( hvm_ioreq_needs_completion(&vio->io_req) )
+    if ( ioreq_needs_completion(&vio->io_req) )
         vio->io_completion = HVMIO_pio_completion;
 
     switch ( rc )
diff --git a/xen/common/ioreq.c b/xen/common/ioreq.c
index 13ea959..44385ef 100644
--- a/xen/common/ioreq.c
+++ b/xen/common/ioreq.c
@@ -160,7 +160,7 @@ static bool hvm_wait_for_io(struct hvm_ioreq_vcpu *sv, 
ioreq_t *p)
     }
 
     p = &sv->vcpu->arch.hvm.hvm_io.io_req;
-    if ( hvm_ioreq_needs_completion(p) )
+    if ( ioreq_needs_completion(p) )
         p->data = data;
 
     sv->pending = false;
@@ -186,7 +186,7 @@ bool handle_hvm_io_completion(struct vcpu *v)
     if ( sv && !hvm_wait_for_io(sv, get_ioreq(s, v)) )
         return false;
 
-    vio->io_req.state = hvm_ioreq_needs_completion(&vio->io_req) ?
+    vio->io_req.state = ioreq_needs_completion(&vio->io_req) ?
         STATE_IORESP_READY : STATE_IOREQ_NONE;
 
     msix_write_completion(v);
diff --git a/xen/include/asm-x86/hvm/vcpu.h b/xen/include/asm-x86/hvm/vcpu.h
index 5ccd075..6c1feda 100644
--- a/xen/include/asm-x86/hvm/vcpu.h
+++ b/xen/include/asm-x86/hvm/vcpu.h
@@ -91,13 +91,6 @@ struct hvm_vcpu_io {
     const struct g2m_ioport *g2m_ioport;
 };
 
-static inline bool hvm_ioreq_needs_completion(const ioreq_t *ioreq)
-{
-    return ioreq->state == STATE_IOREQ_READY &&
-           !ioreq->data_is_ptr &&
-           (ioreq->type != IOREQ_TYPE_PIO || ioreq->dir != IOREQ_WRITE);
-}
-
 struct nestedvcpu {
     bool_t nv_guestmode; /* vcpu in guestmode? */
     void *nv_vvmcx; /* l1 guest virtual VMCB/VMCS */
diff --git a/xen/include/xen/ioreq.h b/xen/include/xen/ioreq.h
index ad47c61..3cc333d 100644
--- a/xen/include/xen/ioreq.h
+++ b/xen/include/xen/ioreq.h
@@ -21,6 +21,13 @@
 
 #include <xen/sched.h>
 
+static inline bool ioreq_needs_completion(const ioreq_t *ioreq)
+{
+    return ioreq->state == STATE_IOREQ_READY &&
+           !ioreq->data_is_ptr &&
+           (ioreq->type != IOREQ_TYPE_PIO || ioreq->dir != IOREQ_WRITE);
+}
+
 #define HANDLE_BUFIOREQ(s) \
     ((s)->bufioreq_handling != HVM_IOREQSRV_BUFIOREQ_OFF)
 
-- 
2.7.4