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bh=DwgFh/do0f62HJt3XKCIMv7RGuZHX3F/7ZyHMN+YpBE=; b=Djrcf1U5p6mGNjnv63Gf4sOJlmZ1TPDxkU7Z1/gXcMny9MhoQmCsFsyKbdJiSuFKzT+WdS c9lTcVbdFlKoK852RyDhhZCUIY9rvshhfJrs3W7oqEztvjWl5qnA+MG1AIBtzHsC9zilmK XxZEdBrxbKQNIpCmaeLZV+UvM6cSphM= X-MC-Unique: SxZ3qJ4qOIG-crKdY-6iNw-1 From: Thomas Huth To: qemu-devel@nongnu.org, Richard Henderson Cc: Alexander Bulekov , Darren Kenny Subject: [PULL 20/20] memory: stricter checks prior to unsetting engaged_in_io Date: Mon, 22 May 2023 13:50:14 +0200 Message-Id: <20230522115014.1110840-21-thuth@redhat.com> In-Reply-To: <20230522115014.1110840-1-thuth@redhat.com> References: <20230522115014.1110840-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1684756602321100004 Content-Type: text/plain; charset="utf-8" From: Alexander Bulekov engaged_in_io could be unset by an MR with re-entrancy checks disabled. Ensure that only MRs that can set the engaged_in_io flag can unset it. Signed-off-by: Alexander Bulekov Message-Id: <20230516084002.3813836-1-alxndr@bu.edu> Reviewed-by: Darren Kenny Signed-off-by: Thomas Huth --- softmmu/memory.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/softmmu/memory.c b/softmmu/memory.c index 342c121514..9ee4131d75 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -534,6 +534,7 @@ static MemTxResult access_with_adjusted_size(hwaddr add= r, unsigned access_size; unsigned i; MemTxResult r =3D MEMTX_OK; + bool reentrancy_guard_applied =3D false; =20 if (!access_size_min) { access_size_min =3D 1; @@ -552,6 +553,7 @@ static MemTxResult access_with_adjusted_size(hwaddr add= r, return MEMTX_ACCESS_ERROR; } mr->dev->mem_reentrancy_guard.engaged_in_io =3D true; + reentrancy_guard_applied =3D true; } =20 /* FIXME: support unaligned access? */ @@ -568,7 +570,7 @@ static MemTxResult access_with_adjusted_size(hwaddr add= r, access_mask, attrs); } } - if (mr->dev) { + if (mr->dev && reentrancy_guard_applied) { mr->dev->mem_reentrancy_guard.engaged_in_io =3D false; } return r; --=20 2.31.1