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Berrange" , Markus Armbruster , Steve Sistare Subject: [PATCH V2 05/13] physmem: preserve ram blocks for cpr Date: Mon, 30 Sep 2024 12:40:36 -0700 Message-Id: <1727725244-105198-6-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1727725244-105198-1-git-send-email-steven.sistare@oracle.com> References: <1727725244-105198-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-09-30_19,2024-09-30_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 phishscore=0 malwarescore=0 mlxscore=0 spamscore=0 suspectscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2408220000 definitions=main-2409300142 X-Proofpoint-ORIG-GUID: 3H57nQpD4fwOf5l3fSjuuHoVavi2_Kum X-Proofpoint-GUID: 3H57nQpD4fwOf5l3fSjuuHoVavi2_Kum Received-SPF: pass client-ip=205.220.165.32; envelope-from=steven.sistare@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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: 2.1.29 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-bounces+qemu-devel=archiver.kernel.org@nongnu.org Save the memfd for anonymous ramblocks in CPR state, along with a name that uniquely identifies it. The block's idstr is not yet set, so it cannot be used for this purpose. Find the saved memfd in new QEMU when creating a block. QEMU hard-codes the length of some internally-created blocks, so to guard against that length changing, use lseek to get the actual length of an incoming memfd. Signed-off-by: Steve Sistare --- system/physmem.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/system/physmem.c b/system/physmem.c index 174f7e0..ddbeec9 100644 --- a/system/physmem.c +++ b/system/physmem.c @@ -72,6 +72,7 @@ #include "qapi/qapi-types-migration.h" #include "migration/options.h" +#include "migration/cpr.h" #include "migration/vmstate.h" #include "qemu/range.h" @@ -1663,6 +1664,19 @@ void qemu_ram_unset_idstr(RAMBlock *block) } } +static char *cpr_name(RAMBlock *block) +{ + MemoryRegion *mr = block->mr; + const char *mr_name = memory_region_name(mr); + g_autofree char *id = mr->dev ? qdev_get_dev_path(mr->dev) : NULL; + + if (id) { + return g_strdup_printf("%s/%s", id, mr_name); + } else { + return g_strdup(mr_name); + } +} + size_t qemu_ram_pagesize(RAMBlock *rb) { return rb->page_size; @@ -1858,14 +1872,18 @@ static void ram_block_add(RAMBlock *new_block, Error **errp) TYPE_MEMORY_BACKEND)) { size_t max_length = new_block->max_length; MemoryRegion *mr = new_block->mr; - const char *name = memory_region_name(mr); + g_autofree char *name = cpr_name(new_block); new_block->mr->align = QEMU_VMALLOC_ALIGN; new_block->flags |= RAM_SHARED; + new_block->fd = cpr_find_fd(name, 0); if (new_block->fd == -1) { new_block->fd = qemu_memfd_create(name, max_length + mr->align, 0, 0, 0, errp); + cpr_save_fd(name, 0, new_block->fd); + } else { + new_block->max_length = lseek(new_block->fd, 0, SEEK_END); } if (new_block->fd >= 0) { @@ -1875,6 +1893,7 @@ static void ram_block_add(RAMBlock *new_block, Error **errp) false, 0, errp); } if (!new_block->host) { + cpr_delete_fd(name, 0); qemu_mutex_unlock_ramlist(); return; } @@ -2182,6 +2201,8 @@ static void reclaim_ramblock(RAMBlock *block) void qemu_ram_free(RAMBlock *block) { + g_autofree char *name = NULL; + if (!block) { return; } @@ -2192,6 +2213,8 @@ void qemu_ram_free(RAMBlock *block) } qemu_mutex_lock_ramlist(); + name = cpr_name(block); + cpr_delete_fd(name, 0); QLIST_REMOVE_RCU(block, next); ram_list.mru_block = NULL; /* Write list before version */