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KVM: selftests: dirty-log: Upgrade flag accesses to acquire/release semantics

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In order to preserve ordering, make sure that the flag accesses
in the dirty log are done using acquire/release accessors.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20220926145120.27974-6-maz@kernel.org
This commit is contained in:
Marc Zyngier
2022-09-26 15:51:19 +01:00
parent 671c8c7f9f
commit 4eb6486cb4
1 changed files with 3 additions and 2 deletions
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5
tools/testing/selftests/kvm/dirty_log_test.c
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@@ -17,6 +17,7 @@
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/atomic.h>
#include <asm/barrier.h>
#include "kvm_util.h"
#include "test_util.h"
@@ -279,12 +280,12 @@ static void dirty_ring_create_vm_done(struct kvm_vm *vm)
static inline bool dirty_gfn_is_dirtied(struct kvm_dirty_gfn *gfn)
{
return gfn->flags == KVM_DIRTY_GFN_F_DIRTY;
return smp_load_acquire(&gfn->flags) == KVM_DIRTY_GFN_F_DIRTY;
}
static inline void dirty_gfn_set_collected(struct kvm_dirty_gfn *gfn)
{
gfn->flags = KVM_DIRTY_GFN_F_RESET;
smp_store_release(&gfn->flags, KVM_DIRTY_GFN_F_RESET);
}
static uint32_t dirty_ring_collect_one(struct kvm_dirty_gfn *dirty_gfns,