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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Xen-devel <xen-devel@lists.xen.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: [PATCH v3 02/24] x86/emul: Drop X86EMUL_CMPXCHG_FAILED
Date: Wed, 30 Nov 2016 13:50:19 +0000	[thread overview]
Message-ID: <1480513841-7565-3-git-send-email-andrew.cooper3@citrix.com> (raw)
In-Reply-To: <1480513841-7565-1-git-send-email-andrew.cooper3@citrix.com>

X86EMUL_CMPXCHG_FAILED was introduced in c/s d430aae25 in 2005.  Even at the
time it alised what is now X86EMUL_RETRY (as well as what is now
X86EMUL_EXCEPTION).  I am not sure why the distinction was considered useful
at the time.

It is only used twice; there is no need to call it out differently from other
uses of X86EMUL_RETRY.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Tim Deegan <tim@xen.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
v2:
 * New
---
 xen/arch/x86/mm.c                      | 2 +-
 xen/arch/x86/mm/shadow/multi.c         | 2 +-
 xen/arch/x86/x86_emulate/x86_emulate.h | 2 --
 3 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 03dcd71..5b0e9f3 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -5254,7 +5254,7 @@ static int ptwr_emulated_update(
         {
             unmap_domain_page(pl1e);
             put_page_from_l1e(nl1e, d);
-            return X86EMUL_CMPXCHG_FAILED;
+            return X86EMUL_RETRY;
         }
     }
     else
diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c
index d70b1c6..9ee48a8 100644
--- a/xen/arch/x86/mm/shadow/multi.c
+++ b/xen/arch/x86/mm/shadow/multi.c
@@ -4694,7 +4694,7 @@ sh_x86_emulate_cmpxchg(struct vcpu *v, unsigned long vaddr,
     }
 
     if ( prev != old )
-        rv = X86EMUL_CMPXCHG_FAILED;
+        rv = X86EMUL_RETRY;
 
     SHADOW_DEBUG(EMULATE, "va %#lx was %#lx expected %#lx"
                   " wanted %#lx now %#lx bytes %u\n",
diff --git a/xen/arch/x86/x86_emulate/x86_emulate.h b/xen/arch/x86/x86_emulate/x86_emulate.h
index 993c576..ec824ce 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.h
+++ b/xen/arch/x86/x86_emulate/x86_emulate.h
@@ -109,8 +109,6 @@ struct __attribute__((__packed__)) segment_register {
 #define X86EMUL_EXCEPTION      2
  /* Retry the emulation for some reason. No state modified. */
 #define X86EMUL_RETRY          3
- /* (cmpxchg accessor): CMPXCHG failed. Maps to X86EMUL_RETRY in caller. */
-#define X86EMUL_CMPXCHG_FAILED 3
 
 /* FPU sub-types which may be requested via ->get_fpu(). */
 enum x86_emulate_fpu_type {
-- 
2.1.4


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  parent reply	other threads:[~2016-11-30 13:50 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-30 13:50 [PATCH for-4.9 v3 00/24] XSA-191 followup Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 01/24] x86/shadow: Fix #PFs from emulated writes crossing a page boundary Andrew Cooper
2016-11-30 13:50 ` Andrew Cooper [this message]
2016-11-30 13:50 ` [PATCH v3 03/24] x86/emul: Simplfy emulation state setup Andrew Cooper
2016-12-08  6:34   ` George Dunlap
2016-11-30 13:50 ` [PATCH v3 04/24] x86/emul: Rename hvm_trap to x86_event and move it into the emulation infrastructure Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 05/24] x86/emul: Rename HVM_DELIVER_NO_ERROR_CODE to X86_EVENT_NO_EC Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 06/24] x86/pv: Implement pv_inject_{event, page_fault, hw_exception}() Andrew Cooper
2016-12-01 10:06   ` Jan Beulich
2016-11-30 13:50 ` [PATCH v3 07/24] x86/emul: Clean up the naming of the retire union Andrew Cooper
2016-11-30 13:58   ` Paul Durrant
2016-11-30 14:02     ` Andrew Cooper
2016-11-30 14:05       ` Paul Durrant
2016-11-30 16:43         ` Jan Beulich
2016-12-01 10:08   ` Jan Beulich
2016-11-30 13:50 ` [PATCH v3 08/24] x86/emul: Correct the behaviour of pop %ss and interrupt shadowing Andrew Cooper
2016-12-01 10:18   ` Jan Beulich
2016-12-01 10:51     ` Andrew Cooper
2016-12-01 11:19       ` Jan Beulich
2016-11-30 13:50 ` [PATCH v3 09/24] x86/emul: Provide a wrapper to x86_emulate() to ASSERT() certain behaviour Andrew Cooper
2016-12-01 10:40   ` Jan Beulich
2016-12-01 10:58     ` Andrew Cooper
2016-12-01 11:21       ` Jan Beulich
2016-11-30 13:50 ` [PATCH v3 10/24] x86/emul: Always use fault semantics for software events Andrew Cooper
2016-11-30 17:55   ` Boris Ostrovsky
2016-12-01 10:53   ` Jan Beulich
2016-12-01 11:15     ` Andrew Cooper
2016-12-01 11:23       ` Jan Beulich
2016-11-30 13:50 ` [PATCH v3 11/24] x86/emul: Implement singlestep as a retire flag Andrew Cooper
2016-11-30 14:28   ` Paul Durrant
2016-12-01 11:16   ` Jan Beulich
2016-12-01 11:23     ` Andrew Cooper
2016-12-01 11:33       ` Tim Deegan
2016-12-01 12:05       ` Jan Beulich
2016-11-30 13:50 ` [PATCH v3 12/24] x86/emul: Remove opencoded exception generation Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 13/24] x86/emul: Rework emulator event injection Andrew Cooper
2016-11-30 14:26   ` Paul Durrant
2016-12-01 11:35   ` Tim Deegan
2016-12-01 12:31   ` Jan Beulich
2016-11-30 13:50 ` [PATCH v3 14/24] x86/vmx: Use hvm_{get, set}_segment_register() rather than vmx_{get, set}_segment_register() Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 15/24] x86/hvm: Reposition the modification of raw segment data from the VMCB/VMCS Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 16/24] x86/emul: Avoid raising faults behind the emulators back Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 17/24] x86/pv: " Andrew Cooper
2016-12-01 11:50   ` Tim Deegan
2016-12-01 12:57   ` Jan Beulich
2016-12-01 13:12     ` Andrew Cooper
2016-12-01 13:27       ` Jan Beulich
2016-11-30 13:50 ` [PATCH v3 18/24] x86/shadow: " Andrew Cooper
2016-12-01 11:39   ` Tim Deegan
2016-12-01 11:40     ` Andrew Cooper
2016-12-01 13:00   ` Jan Beulich
2016-12-01 13:15     ` Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 19/24] x86/hvm: Extend the hvm_copy_*() API with a pagefault_info pointer Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 20/24] x86/hvm: Reimplement hvm_copy_*_nofault() in terms of no pagefault_info Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 21/24] x86/hvm: Rename hvm_copy_*_guest_virt() to hvm_copy_*_guest_linear() Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 22/24] x86/hvm: Avoid __hvm_copy() raising #PF behind the emulators back Andrew Cooper
2016-11-30 14:29   ` Paul Durrant
2016-11-30 13:50 ` [PATCH v3 23/24] x86/emul: Prepare to allow use of system segments for memory references Andrew Cooper
2016-11-30 13:50 ` [PATCH v3 24/24] x86/emul: Use system-segment relative memory accesses Andrew Cooper

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