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Fri, 24 Jul 2020 05:23:07 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org Subject: [PATCH 7/7] ide: cancel pending callbacks on SRST Date: Fri, 24 Jul 2020 01:23:00 -0400 Message-Id: <20200724052300.1163728-8-jsnow@redhat.com> In-Reply-To: <20200724052300.1163728-1-jsnow@redhat.com> References: <20200724052300.1163728-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=207.211.31.120; envelope-from=jsnow@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/24 00:01:02 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, Alexander Bulekov , John Snow , qemu-block@nongnu.org, philmd@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The SRST implementation did not keep up with the rest of IDE; it is possible to perform a weak reset on an IDE device to remove the BSY/DRQ bits, and then issue writes to the control/device registers which can cause chaos with the state machine. Fix that by actually performing a real reset. Reported-by: Alexander Bulekov Fixes: https://bugs.launchpad.net/qemu/+bug/1878253 Fixes: https://bugs.launchpad.net/qemu/+bug/1887303 Fixes: https://bugs.launchpad.net/qemu/+bug/1887309 Signed-off-by: John Snow --- hw/ide/core.c | 58 +++++++++++++++++++++++++++++++++++---------------- 1 file changed, 40 insertions(+), 18 deletions(-) diff --git a/hw/ide/core.c b/hw/ide/core.c index e4c69a7fde..4da689abdf 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -2241,6 +2241,37 @@ uint32_t ide_status_read(void *opaque, uint32_t addr) return ret; } +static void ide_perform_srst(IDEState *s) +{ + s->status |= BUSY_STAT; + + /* Halt PIO (Via register state); PIO BH remains scheduled. */ + ide_transfer_halt(s); + + /* Cancel DMA -- may drain block device and invoke callbacks */ + ide_cancel_dma_sync(s); + + /* Cancel PIO callback, reset registers/signature, etc */ + ide_reset(s); + + if (s->drive_kind == IDE_CD) { + /* ATAPI drives do not set READY or SEEK */ + s->status = 0x00; + } +} + +static void ide_bus_perform_srst(void *opaque) +{ + IDEBus *bus = opaque; + IDEState *s; + int i; + + for (i = 0; i < 2; i++) { + s = &bus->ifs[i]; + ide_perform_srst(s); + } +} + void ide_ctrl_write(void *opaque, uint32_t addr, uint32_t val) { IDEBus *bus = opaque; @@ -2249,26 +2280,17 @@ void ide_ctrl_write(void *opaque, uint32_t addr, uint32_t val) trace_ide_ctrl_write(addr, val, bus); - /* common for both drives */ - if (!(bus->cmd & IDE_CTRL_RESET) && - (val & IDE_CTRL_RESET)) { - /* reset low to high */ - for(i = 0;i < 2; i++) { + /* Device0 and Device1 each have their own control register, + * but QEMU models it as just one register in the controller. */ + if ((bus->cmd & IDE_CTRL_RESET) && + !(val & IDE_CTRL_RESET)) { + /* SRST triggers on falling edge */ + for (i = 0; i < 2; i++) { s = &bus->ifs[i]; - s->status = BUSY_STAT | SEEK_STAT; - s->error = 0x01; - } - } else if ((bus->cmd & IDE_CTRL_RESET) && - !(val & IDE_CTRL_RESET)) { - /* high to low */ - for(i = 0;i < 2; i++) { - s = &bus->ifs[i]; - if (s->drive_kind == IDE_CD) - s->status = 0x00; /* NOTE: READY is _not_ set */ - else - s->status = READY_STAT | SEEK_STAT; - ide_set_signature(s); + s->status |= BUSY_STAT; } + aio_bh_schedule_oneshot(qemu_get_aio_context(), + ide_bus_perform_srst, bus); } bus->cmd = val; -- 2.26.2