Xen-Devel Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH] x86/vmx: reorder code in vmx_deliver_posted_intr
@ 2020-07-30 14:03 Roger Pau Monne
  2020-07-31 13:05 ` Jan Beulich
  2020-08-14  5:49 ` Tian, Kevin
  0 siblings, 2 replies; 4+ messages in thread
From: Roger Pau Monne @ 2020-07-30 14:03 UTC (permalink / raw)
  To: xen-devel
  Cc: Kevin Tian, Jun Nakajima, Wei Liu, Andrew Cooper, Jan Beulich,
	Roger Pau Monne

Remove the unneeded else branch, which allows to reduce the
indentation of a larger block of code, while making the flow of the
function more obvious.

No functional change intended.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
---
 xen/arch/x86/hvm/vmx/vmx.c | 55 ++++++++++++++++++--------------------
 1 file changed, 26 insertions(+), 29 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index eb54aadfba..7773dcae1b 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -2003,6 +2003,8 @@ static void __vmx_deliver_posted_interrupt(struct vcpu *v)
 
 static void vmx_deliver_posted_intr(struct vcpu *v, u8 vector)
 {
+    struct pi_desc old, new, prev;
+
     if ( pi_test_and_set_pir(vector, &v->arch.hvm.vmx.pi_desc) )
         return;
 
@@ -2014,41 +2016,36 @@ static void vmx_deliver_posted_intr(struct vcpu *v, u8 vector)
          * VMEntry as it used to be.
          */
         pi_set_on(&v->arch.hvm.vmx.pi_desc);
+        vcpu_kick(v);
+        return;
     }
-    else
-    {
-        struct pi_desc old, new, prev;
 
-        prev.control = v->arch.hvm.vmx.pi_desc.control;
+    prev.control = v->arch.hvm.vmx.pi_desc.control;
 
-        do {
-            /*
-             * Currently, we don't support urgent interrupt, all
-             * interrupts are recognized as non-urgent interrupt,
-             * Besides that, if 'ON' is already set, no need to
-             * sent posted-interrupts notification event as well,
-             * according to hardware behavior.
-             */
-            if ( pi_test_sn(&prev) || pi_test_on(&prev) )
-            {
-                vcpu_kick(v);
-                return;
-            }
-
-            old.control = v->arch.hvm.vmx.pi_desc.control &
-                          ~((1 << POSTED_INTR_ON) | (1 << POSTED_INTR_SN));
-            new.control = v->arch.hvm.vmx.pi_desc.control |
-                          (1 << POSTED_INTR_ON);
+    do {
+        /*
+         * Currently, we don't support urgent interrupt, all
+         * interrupts are recognized as non-urgent interrupt,
+         * Besides that, if 'ON' is already set, no need to
+         * sent posted-interrupts notification event as well,
+         * according to hardware behavior.
+         */
+        if ( pi_test_sn(&prev) || pi_test_on(&prev) )
+        {
+            vcpu_kick(v);
+            return;
+        }
 
-            prev.control = cmpxchg(&v->arch.hvm.vmx.pi_desc.control,
-                                   old.control, new.control);
-        } while ( prev.control != old.control );
+        old.control = v->arch.hvm.vmx.pi_desc.control &
+                      ~((1 << POSTED_INTR_ON) | (1 << POSTED_INTR_SN));
+        new.control = v->arch.hvm.vmx.pi_desc.control |
+                      (1 << POSTED_INTR_ON);
 
-        __vmx_deliver_posted_interrupt(v);
-        return;
-    }
+        prev.control = cmpxchg(&v->arch.hvm.vmx.pi_desc.control,
+                               old.control, new.control);
+    } while ( prev.control != old.control );
 
-    vcpu_kick(v);
+    __vmx_deliver_posted_interrupt(v);
 }
 
 static void vmx_sync_pir_to_irr(struct vcpu *v)
-- 
2.28.0



^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, back to index

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-30 14:03 [PATCH] x86/vmx: reorder code in vmx_deliver_posted_intr Roger Pau Monne
2020-07-31 13:05 ` Jan Beulich
2020-07-31 13:56   ` Roger Pau Monné
2020-08-14  5:49 ` Tian, Kevin

Xen-Devel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/xen-devel/0 xen-devel/git/0.git
	git clone --mirror https://lore.kernel.org/xen-devel/1 xen-devel/git/1.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 xen-devel xen-devel/ https://lore.kernel.org/xen-devel \
		xen-devel@lists.xenproject.org xen-devel@lists.xen.org
	public-inbox-index xen-devel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.xenproject.lists.xen-devel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git