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(unknown [9.114.12.104]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 11 Aug 2022 12:12:01 +0000 (GMT) From: Janosch Frank To: qemu-devel@nongnu.org Cc: marcandre.lureau@redhat.com, pbonzini@redhat.com, mhartmay@linux.ibm.com, borntraeger@linux.ibm.com, imbrenda@linux.ibm.com, pasic@linux.ibm.com, cohuck@redhat.com, thuth@redhat.com, qemu-s390x@nongnu.org, seiden@linux.ibm.com, scgl@linux.ibm.com Subject: [PATCH v5 03/18] dump: Refactor dump_iterate and introduce dump_filter_memblock_*() Date: Thu, 11 Aug 2022 12:10:56 +0000 Message-Id: <20220811121111.9878-4-frankja@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220811121111.9878-1-frankja@linux.ibm.com> References: <20220811121111.9878-1-frankja@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: pjeVIAPxGCjsjKUTFmr1I6y8ipVEUrJ8 X-Proofpoint-ORIG-GUID: qM3qc0eyQm0507Pe82LxuKbnarIZhYBI X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-11_05,2022-08-11_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 mlxscore=0 spamscore=0 malwarescore=0 phishscore=0 adultscore=0 mlxlogscore=999 priorityscore=1501 suspectscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208110037 Received-SPF: pass client-ip=148.163.156.1; envelope-from=frankja@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The iteration over the memblocks in dump_iterate() is hard to understand so it's about time to clean it up. Instead of manually grabbing the next memblock we can use QTAILQ_FOREACH to iterate over all memblocks. Additionally we move the calculation of the offset and length out by introducing and using the dump_filter_memblock_*() functions. These functions will later be used to cleanup other parts of dump.c. Signed-off-by: Janosch Frank Reviewed-by: Janis Schoetterl-Glausch Reviewed-by: Marc-André Lureau --- dump/dump.c | 80 ++++++++++++++++++++++++++++++----------------------- 1 file changed, 45 insertions(+), 35 deletions(-) diff --git a/dump/dump.c b/dump/dump.c index 0ed7cf9c7b..340de5a1e7 100644 --- a/dump/dump.c +++ b/dump/dump.c @@ -591,31 +591,43 @@ static void dump_begin(DumpState *s, Error **errp) write_elf_notes(s, errp); } -static int get_next_block(DumpState *s, GuestPhysBlock *block) +static int64_t dump_filtered_memblock_size(GuestPhysBlock *block, + int64_t filter_area_start, + int64_t filter_area_length) { - while (1) { - block = QTAILQ_NEXT(block, next); - if (!block) { - /* no more block */ - return 1; - } + int64_t size, left, right; - s->start = 0; - s->next_block = block; - if (s->has_filter) { - if (block->target_start >= s->begin + s->length || - block->target_end <= s->begin) { - /* This block is out of the range */ - continue; - } - - if (s->begin > block->target_start) { - s->start = s->begin - block->target_start; - } - } - - return 0; + /* No filter, return full size */ + if (!filter_area_length) { + return block->target_end - block->target_start; } + + /* calculate the overlapped region. */ + left = MAX(filter_area_start, block->target_start); + right = MIN(filter_area_start + filter_area_length, block->target_end); + size = right - left; + size = size > 0 ? size : 0; + + return size; +} + +static int64_t dump_filtered_memblock_start(GuestPhysBlock *block, + int64_t filter_area_start, + int64_t filter_area_length) +{ + if (filter_area_length) { + /* return -1 if the block is not within filter area */ + if (block->target_start >= filter_area_start + filter_area_length || + block->target_end <= filter_area_start) { + return -1; + } + + if (filter_area_start > block->target_start) { + return filter_area_start - block->target_start; + } + } + + return 0; } /* write all memory to vmcore */ @@ -623,24 +635,22 @@ static void dump_iterate(DumpState *s, Error **errp) { ERRP_GUARD(); GuestPhysBlock *block; - int64_t size; + int64_t memblock_size, memblock_start; - do { - block = s->next_block; - - size = block->target_end - block->target_start; - if (s->has_filter) { - size -= s->start; - if (s->begin + s->length < block->target_end) { - size -= block->target_end - (s->begin + s->length); - } + QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { + memblock_start = dump_filtered_memblock_start(block, s->begin, s->length); + if (memblock_start == -1) { + continue; } - write_memory(s, block, s->start, size, errp); + + memblock_size = dump_filtered_memblock_size(block, s->begin, s->length); + + /* Write the memory to file */ + write_memory(s, block, memblock_start, memblock_size, errp); if (*errp) { return; } - - } while (!get_next_block(s, block)); + } } static void create_vmcore(DumpState *s, Error **errp)