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From 3fe466338a4ab4a119933768462d62c6d7b9024e Mon Sep 17 00:00:00 2001
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From: "plai@redhat.com" <plai@redhat.com>
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Date: Mon, 7 Jan 2019 17:02:20 +0000
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Subject: [PATCH 19/22] mem/nvdimm: ensure write persistence to PMEM in label
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emulation
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RH-Author: plai@redhat.com
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Message-id: <1546880543-24860-8-git-send-email-plai@redhat.com>
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Patchwork-id: 83893
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O-Subject: [RHEL8.0 qemu-kvm PATCH v7 07/10] mem/nvdimm: ensure write persistence to PMEM in label emulation
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Bugzilla: 1539285
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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ae23c9 |
From: Junyan He <junyan.he@intel.com>
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Guest writes to vNVDIMM labels are intercepted and performed on the
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backend by QEMU. When the backend is a real persistent memort, QEMU
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needs to take proper operations to ensure its write persistence on the
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persistent memory. Otherwise, a host power failure may result in the
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loss of guest label configurations.
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Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Igor Mammedov <imammedo@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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(cherry picked from commit faf8a13d80de98b43342a7ec9878b4fd76b18327)
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Signed-off-by: Paul Lai <plai@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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---
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hw/mem/nvdimm.c | 9 ++++++++-
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include/qemu/pmem.h | 30 ++++++++++++++++++++++++++++++
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2 files changed, 38 insertions(+), 1 deletion(-)
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create mode 100644 include/qemu/pmem.h
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diff --git a/hw/mem/nvdimm.c b/hw/mem/nvdimm.c
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index acb656b..0c962fd 100644
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--- a/hw/mem/nvdimm.c
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+++ b/hw/mem/nvdimm.c
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@@ -23,6 +23,7 @@
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*/
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#include "qemu/osdep.h"
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+#include "qemu/pmem.h"
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#include "qapi/error.h"
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#include "qapi/visitor.h"
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#include "hw/mem/nvdimm.h"
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@@ -155,11 +156,17 @@ static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf,
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{
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MemoryRegion *mr;
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PCDIMMDevice *dimm = PC_DIMM(nvdimm);
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+ bool is_pmem = object_property_get_bool(OBJECT(dimm->hostmem),
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+ "pmem", NULL);
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uint64_t backend_offset;
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nvdimm_validate_rw_label_data(nvdimm, size, offset);
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- memcpy(nvdimm->label_data + offset, buf, size);
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+ if (!is_pmem) {
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+ memcpy(nvdimm->label_data + offset, buf, size);
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+ } else {
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+ pmem_memcpy_persist(nvdimm->label_data + offset, buf, size);
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+ }
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mr = host_memory_backend_get_memory(dimm->hostmem, &error_abort);
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backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
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diff --git a/include/qemu/pmem.h b/include/qemu/pmem.h
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new file mode 100644
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index 0000000..ebdb070
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--- /dev/null
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+++ b/include/qemu/pmem.h
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@@ -0,0 +1,30 @@
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+/*
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+ * QEMU header file for libpmem.
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+ *
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+ * Copyright (c) 2018 Intel Corporation.
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+ *
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+ * Author: Haozhong Zhang <address@hidden>
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+ *
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+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
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+ * See the COPYING file in the top-level directory.
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+ */
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+
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+#ifndef QEMU_PMEM_H
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+#define QEMU_PMEM_H
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+
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+#ifdef CONFIG_LIBPMEM
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+#include <libpmem.h>
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+#else /* !CONFIG_LIBPMEM */
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+
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+static inline void *
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+pmem_memcpy_persist(void *pmemdest, const void *src, size_t len)
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+{
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+ /* If 'pmem' option is 'on', we should always have libpmem support,
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+ or qemu will report a error and exit, never come here. */
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+ g_assert_not_reached();
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+ return NULL;
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+}
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+
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+#endif /* CONFIG_LIBPMEM */
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+
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+#endif /* !QEMU_PMEM_H */
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--
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1.8.3.1
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