[Xen-changelog] [xen master] xen: Remove domain_crash_synchronous() completely

[patchbot@xxxxxxx]

commit 4c9a6546e4c33ba2b170d5c1d0c340c1dd384ffc
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Wed Jan 24 16:59:42 2018 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Aug 2 10:10:43 2018 +0100

    xen: Remove domain_crash_synchronous() completely
    
    domain_crash_synchronous() is unsafe to use in general as it may leave
    spinlocks held, temporary memory allocated, etc.
    
    With domain_crash_synchronous() removed from the ARM code in 4.11, take the
    opportunity to remove the infrastructure completely by opencoding the 
softirq
    loop in the remaining callsites, all of which are destined for deletion.
    
    None of these sites are at risk of having a pending ioreq to qemu, which 
means
    that the vcpu_end_shutdown_deferral() isn't necessary.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/traps.c    |  5 ++++-
 xen/common/domain.c     | 11 -----------
 xen/common/wait.c       | 13 ++++++++++---
 xen/include/xen/sched.h | 10 ----------
 4 files changed, 14 insertions(+), 25 deletions(-)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index 789d7ff8cd..ddff346a2f 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -2215,7 +2215,10 @@ void asm_domain_crash_synchronous(unsigned long addr)
     printk("domain_crash_sync called from entry.S: fault at %p %pS\n",
            _p(addr), _p(addr));
 
-    __domain_crash_synchronous();
+    __domain_crash(current->domain);
+
+    for ( ; ; )
+        do_softirq();
 }
 
 /*
diff --git a/xen/common/domain.c b/xen/common/domain.c
index 08ca4b1671..749722bcb2 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -700,17 +700,6 @@ void __domain_crash(struct domain *d)
 }
 
 
-void __domain_crash_synchronous(void)
-{
-    __domain_crash(current->domain);
-
-    vcpu_end_shutdown_deferral(current);
-
-    for ( ; ; )
-        do_softirq();
-}
-
-
 int domain_shutdown(struct domain *d, u8 reason)
 {
     struct vcpu *v;
diff --git a/xen/common/wait.c b/xen/common/wait.c
index a57bc10d61..4f830a14e8 100644
--- a/xen/common/wait.c
+++ b/xen/common/wait.c
@@ -20,6 +20,7 @@
  */
 
 #include <xen/sched.h>
+#include <xen/softirq.h>
 #include <xen/wait.h>
 #include <xen/errno.h>
 
@@ -135,7 +136,10 @@ static void __prepare_to_wait(struct waitqueue_vcpu *wqv)
     if ( vcpu_set_hard_affinity(curr, cpumask_of(wqv->wakeup_cpu)) )
     {
         gdprintk(XENLOG_ERR, "Unable to set vcpu affinity\n");
-        domain_crash_synchronous();
+        domain_crash(current->domain);
+
+        for ( ; ; )
+            do_softirq();
     }
 
     /* Hand-rolled setjmp(). */
@@ -166,7 +170,10 @@ static void __prepare_to_wait(struct waitqueue_vcpu *wqv)
     if ( unlikely(wqv->esp == 0) )
     {
         gdprintk(XENLOG_ERR, "Stack too large in %s\n", __func__);
-        domain_crash_synchronous();
+        domain_crash(current->domain);
+
+        for ( ; ; )
+            do_softirq();
     }
 
     cpu_info->guest_cpu_user_regs.entry_vector = entry_vector;
@@ -196,7 +203,7 @@ void check_wakeup_from_wait(void)
         if ( vcpu_set_hard_affinity(curr, cpumask_of(wqv->wakeup_cpu)) )
         {
             gdprintk(XENLOG_ERR, "Unable to set vcpu affinity\n");
-            domain_crash_synchronous();
+            domain_crash(current->domain);
         }
         wait(); /* takes us back into the scheduler */
     }
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 851f11ecf7..3c35473742 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -617,16 +617,6 @@ void __domain_crash(struct domain *d);
 } while (0)
 
 /*
- * Mark current domain as crashed and synchronously deschedule from the local
- * processor. This function never returns.
- */
-void noreturn __domain_crash_synchronous(void);
-#define domain_crash_synchronous() do {                                   \
-    printk("domain_crash_sync called from %s:%d\n", __FILE__, __LINE__);  \
-    __domain_crash_synchronous();                                         \
-} while (0)
-
-/*
  * Called from assembly code, with an optional address to help indicate why
  * the crash occured.  If addr is 0, look up address from last extable
  * redirection.
--
generated by git-patchbot for /home/xen/git/xen.git#master

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