From ca87b042011f83f8851f0f76b3599d627d61463d Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 8 Mar 2018 15:58:19 +0100
Subject: [PATCH 06/17] address_space_rw: address_space_to_flatview needs RCU
 lock

RH-Author: Paolo Bonzini <pbonzini@redhat.com>
Message-id: <20180308155819.20598-7-pbonzini@redhat.com>
Patchwork-id: 79192
O-Subject: [RHEL7.5 qemu-kvm-rhev PATCH 6/6] address_space_rw: address_space_to_flatview needs RCU lock
Bugzilla: 1554930
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>

address_space_rw is calling address_space_to_flatview but it can
be called outside the RCU lock.  To fix it, transform flatview_rw
into address_space_rw, since flatview_rw is otherwise unused.

Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry pick from commit db84fd973eba3f1e121416dcab73a4e8a60f2526)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 exec.c | 28 ++++++++++------------------
 1 file changed, 10 insertions(+), 18 deletions(-)

diff --git a/exec.c b/exec.c
index 58ad24b..12ec761 100644
--- a/exec.c
+++ b/exec.c
@@ -3045,24 +3045,6 @@ static MemTxResult flatview_read(FlatView *fv, hwaddr addr,
                                   addr1, l, mr);
 }
 
-static MemTxResult flatview_rw(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
-                               uint8_t *buf, int len, bool is_write)
-{
-    if (is_write) {
-        return flatview_write(fv, addr, attrs, (uint8_t *)buf, len);
-    } else {
-        return flatview_read(fv, addr, attrs, (uint8_t *)buf, len);
-    }
-}
-
-MemTxResult address_space_rw(AddressSpace *as, hwaddr addr,
-                             MemTxAttrs attrs, uint8_t *buf,
-                             int len, bool is_write)
-{
-    return flatview_rw(address_space_to_flatview(as),
-                       addr, attrs, buf, len, is_write);
-}
-
 MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr,
                                     MemTxAttrs attrs, uint8_t *buf, int len)
 {
@@ -3096,6 +3078,16 @@ MemTxResult address_space_write(AddressSpace *as, hwaddr addr,
     return result;
 }
 
+MemTxResult address_space_rw(AddressSpace *as, hwaddr addr, MemTxAttrs attrs,
+                             uint8_t *buf, int len, bool is_write)
+{
+    if (is_write) {
+        return address_space_write(as, addr, attrs, buf, len);
+    } else {
+        return address_space_read_full(as, addr, attrs, buf, len);
+    }
+}
+
 void cpu_physical_memory_rw(hwaddr addr, uint8_t *buf,
                             int len, int is_write)
 {
-- 
1.8.3.1