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From 2f3881255e6a50d9821f390972b07c1e9d9de626 Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Thu, 8 Mar 2018 15:58:15 +0100
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Subject: [PATCH 02/17] address_space_write: address_space_to_flatview needs
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RCU lock
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <20180308155819.20598-3-pbonzini@redhat.com>
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Patchwork-id: 79191
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O-Subject: [RHEL7.5 qemu-kvm-rhev PATCH 2/6] address_space_write: address_space_to_flatview needs RCU lock
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Bugzilla: 1554930
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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address_space_write is calling address_space_to_flatview but it can
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be called outside the RCU lock. To fix it, push the rcu_read_lock/unlock
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pair up from flatview_write to address_space_write.
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Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry pick from commit 4c6ebbb364aa6f42c5d8e83e932e967eb83f0e44)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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exec.c | 37 ++++++++++++++++++++++---------------
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1 file changed, 22 insertions(+), 15 deletions(-)
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diff --git a/exec.c b/exec.c
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index 5a12e55..8b50133 100644
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--- a/exec.c
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+++ b/exec.c
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@@ -2942,6 +2942,7 @@ static MemTxResult flatview_write_continue(FlatView *fv, hwaddr addr,
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return result;
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}
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+/* Called from RCU critical section. */
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static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
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const uint8_t *buf, int len)
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{
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@@ -2950,25 +2951,14 @@ static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
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MemoryRegion *mr;
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MemTxResult result = MEMTX_OK;
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- if (len > 0) {
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- rcu_read_lock();
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- l = len;
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- mr = flatview_translate(fv, addr, &addr1, &l, true);
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- result = flatview_write_continue(fv, addr, attrs, buf, len,
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- addr1, l, mr);
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- rcu_read_unlock();
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- }
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+ l = len;
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+ mr = flatview_translate(fv, addr, &addr1, &l, true);
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+ result = flatview_write_continue(fv, addr, attrs, buf, len,
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+ addr1, l, mr);
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return result;
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}
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-MemTxResult address_space_write(AddressSpace *as, hwaddr addr,
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- MemTxAttrs attrs,
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- const uint8_t *buf, int len)
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-{
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- return flatview_write(address_space_to_flatview(as), addr, attrs, buf, len);
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-}
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-
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/* Called within RCU critical section. */
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MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
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MemTxAttrs attrs, uint8_t *buf,
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@@ -3077,6 +3067,23 @@ MemTxResult address_space_rw(AddressSpace *as, hwaddr addr,
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addr, attrs, buf, len, is_write);
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}
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+MemTxResult address_space_write(AddressSpace *as, hwaddr addr,
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+ MemTxAttrs attrs,
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+ const uint8_t *buf, int len)
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+{
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+ MemTxResult result = MEMTX_OK;
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+ FlatView *fv;
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+
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+ if (len > 0) {
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+ rcu_read_lock();
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+ fv = address_space_to_flatview(as);
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+ result = flatview_write(fv, addr, attrs, buf, len);
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+ rcu_read_unlock();
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+ }
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+
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+ return result;
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+}
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+
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void cpu_physical_memory_rw(hwaddr addr, uint8_t *buf,
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int len, int is_write)
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{
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--
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1.8.3.1
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