[PATCH v7 12/15] x86/hvm: remove hvm_io_state enumeration

[Paul Durrant <paul.durrant@citrix.com>]

Emulation request status is already covered by STATE_IOREQ_XXX values so
just use those. The mapping is:

HVMIO_none                -> STATE_IOREQ_NONE
HVMIO_awaiting_completion -> STATE_IOREQ_READY
HVMIO_completed           -> STATE_IORESP_READY

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Keir Fraser <keir@xen.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

v7:
- Modified struct field placement as knock-on from previous patch

v6:
- Added Andrew's reviewed-by

v5:
- Added Jan's acked-by
---
 xen/arch/x86/hvm/emulate.c       |   14 +++++++-------
 xen/arch/x86/hvm/hvm.c           |    6 +++---
 xen/arch/x86/hvm/svm/nestedsvm.c |    2 +-
 xen/arch/x86/hvm/vmx/realmode.c  |    4 ++--
 xen/include/asm-x86/hvm/vcpu.h   |   10 ++--------
 5 files changed, 15 insertions(+), 21 deletions(-)

diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
index 73cce4e..9d9219e 100644
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -130,10 +130,10 @@ static int hvmemul_do_io(
 
     switch ( vio->io_state )
     {
-    case HVMIO_none:
+    case STATE_IOREQ_NONE:
         break;
-    case HVMIO_completed:
-        vio->io_state = HVMIO_none;
+    case STATE_IORESP_READY:
+        vio->io_state = STATE_IOREQ_NONE;
         if ( data_is_addr || dir == IOREQ_WRITE )
             return X86EMUL_UNHANDLEABLE;
         goto finish_access;
@@ -141,7 +141,7 @@ static int hvmemul_do_io(
         return X86EMUL_UNHANDLEABLE;
     }
 
-    vio->io_state = HVMIO_awaiting_completion;
+    vio->io_state = STATE_IOREQ_READY;
     vio->io_size = size;
     vio->io_dir = dir;
     vio->io_data_is_addr = data_is_addr;
@@ -160,7 +160,7 @@ static int hvmemul_do_io(
     {
     case X86EMUL_OKAY:
         vio->io_data = p.data;
-        vio->io_state = HVMIO_none;
+        vio->io_state = STATE_IOREQ_NONE;
         break;
     case X86EMUL_UNHANDLEABLE:
     {
@@ -173,13 +173,13 @@ static int hvmemul_do_io(
             rc = hvm_process_io_intercept(&null_handler, &p);
             if ( rc == X86EMUL_OKAY )
                 vio->io_data = p.data;
-            vio->io_state = HVMIO_none;
+            vio->io_state = STATE_IOREQ_NONE;
         }
         else
         {
             rc = hvm_send_assist_req(s, &p);
             if ( rc != X86EMUL_RETRY || curr->domain->is_shutting_down )
-                vio->io_state = HVMIO_none;
+                vio->io_state = STATE_IOREQ_NONE;
             else if ( data_is_addr || dir == IOREQ_WRITE )
                 rc = X86EMUL_OKAY;
         }
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 8e487d4..3be17f9 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -421,11 +421,11 @@ static void hvm_io_assist(ioreq_t *p)
 
     if ( hvm_vcpu_io_need_completion(vio) )
     {
-        vio->io_state = HVMIO_completed;
+        vio->io_state = STATE_IORESP_READY;
         vio->io_data = p->data;
     }
     else
-        vio->io_state = HVMIO_none;
+        vio->io_state = STATE_IOREQ_NONE;
 
     msix_write_completion(curr);
     vcpu_end_shutdown_deferral(curr);
@@ -505,7 +505,7 @@ void hvm_do_resume(struct vcpu *v)
             guest_cpu_user_regs()->rax = (uint32_t)vio->io_data;
         else
             memcpy(&guest_cpu_user_regs()->rax, &vio->io_data, vio->io_size);
-        vio->io_state = HVMIO_none;
+        vio->io_state = STATE_IOREQ_NONE;
         break;
     case HVMIO_realmode_completion:
     {
diff --git a/xen/arch/x86/hvm/svm/nestedsvm.c b/xen/arch/x86/hvm/svm/nestedsvm.c
index ad8afb4..2243873 100644
--- a/xen/arch/x86/hvm/svm/nestedsvm.c
+++ b/xen/arch/x86/hvm/svm/nestedsvm.c
@@ -1221,7 +1221,7 @@ enum hvm_intblk nsvm_intr_blocked(struct vcpu *v)
          * Delay the injection because this would result in delivering
          * an interrupt *within* the execution of an instruction.
          */
-        if ( v->arch.hvm_vcpu.hvm_io.io_state != HVMIO_none )
+        if ( v->arch.hvm_vcpu.hvm_io.io_state != STATE_IOREQ_NONE )
             return hvm_intblk_shadow;
 
         if ( !nv->nv_vmexit_pending && n2vmcb->exitintinfo.bytes != 0 ) {
diff --git a/xen/arch/x86/hvm/vmx/realmode.c b/xen/arch/x86/hvm/vmx/realmode.c
index deb53ae..25533dc 100644
--- a/xen/arch/x86/hvm/vmx/realmode.c
+++ b/xen/arch/x86/hvm/vmx/realmode.c
@@ -205,7 +205,7 @@ void vmx_realmode(struct cpu_user_regs *regs)
 
         vmx_realmode_emulate_one(&hvmemul_ctxt);
 
-        if ( vio->io_state != HVMIO_none || vio->mmio_retry )
+        if ( vio->io_state != STATE_IOREQ_NONE || vio->mmio_retry )
             break;
 
         /* Stop emulating unless our segment state is not safe */
@@ -219,7 +219,7 @@ void vmx_realmode(struct cpu_user_regs *regs)
     }
 
     /* Need to emulate next time if we've started an IO operation */
-    if ( vio->io_state != HVMIO_none )
+    if ( vio->io_state != STATE_IOREQ_NONE )
         curr->arch.hvm_vmx.vmx_emulate = 1;
 
     if ( !curr->arch.hvm_vmx.vmx_emulate && !curr->arch.hvm_vmx.vmx_realmode )
diff --git a/xen/include/asm-x86/hvm/vcpu.h b/xen/include/asm-x86/hvm/vcpu.h
index 6bb9c12..5c9faf2 100644
--- a/xen/include/asm-x86/hvm/vcpu.h
+++ b/xen/include/asm-x86/hvm/vcpu.h
@@ -30,12 +30,6 @@
 #include <asm/hvm/svm/nestedsvm.h>
 #include <asm/mtrr.h>
 
-enum hvm_io_state {
-    HVMIO_none = 0,
-    HVMIO_awaiting_completion,
-    HVMIO_completed
-};
-
 enum hvm_io_completion {
     HVMIO_no_completion,
     HVMIO_mmio_completion,
@@ -50,10 +44,10 @@ struct hvm_vcpu_asid {
 
 struct hvm_vcpu_io {
     /* I/O request in flight to device model. */
-    enum hvm_io_state      io_state;
     enum hvm_io_completion io_completion;
     unsigned long          io_data;
     unsigned int           io_size;
+    uint8_t                io_state;
     uint8_t                io_dir;
     uint8_t                io_data_is_addr;
 
@@ -90,7 +84,7 @@ struct hvm_vcpu_io {
 
 static inline bool_t hvm_vcpu_io_need_completion(const struct hvm_vcpu_io *vio)
 {
-    return (vio->io_state == HVMIO_awaiting_completion) &&
+    return (vio->io_state == STATE_IOREQ_READY) &&
            !vio->io_data_is_addr &&
            (vio->io_dir == IOREQ_READ);
 }
-- 
1.7.10.4