From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49829) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dE53I-00051V-Db for qemu-devel@nongnu.org; Thu, 25 May 2017 22:32:34 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dE53F-0006mz-7n for qemu-devel@nongnu.org; Thu, 25 May 2017 22:32:32 -0400 Received: from mga09.intel.com ([134.134.136.24]:16476) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dE53E-0006mi-Tr for qemu-devel@nongnu.org; Thu, 25 May 2017 22:32:29 -0400 From: Haozhong Zhang Date: Fri, 26 May 2017 10:32:12 +0800 Message-Id: <20170526023213.18741-1-haozhong.zhang@intel.com> Subject: [Qemu-devel] [RESEND PATCH 1/2] nvdimm: warn if the backend is not a DAX device List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Haozhong Zhang , "Michael S. Tsirkin" , Igor Mammedov , Xiao Guangrong , Stefan Hajnoczi , Dan Williams Applications in Linux guest that use device-dax never trigger flush that can be trapped by KVM/QEMU. Meanwhile, if the host backend is not device-dax, QEMU cannot guarantee the persistence of guest writes. Before solving this flushing problem, QEMU should warn users if the host backend is not device-dax. Signed-off-by: Haozhong Zhang Message-id: CAPcyv4hV2-ZW8SMCRtD0P_86KgR3DHOvNe+6T5SY2u7wXg3gEg@mail.gmail.com --- Cc: "Michael S. Tsirkin" Cc: Igor Mammedov Cc: Xiao Guangrong Cc: Stefan Hajnoczi Cc: Dan Williams --- Resend because the wrong maintainer email address was used. --- hw/mem/nvdimm.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/hw/mem/nvdimm.c b/hw/mem/nvdimm.c index db896b0bb6..c7bb407f33 100644 --- a/hw/mem/nvdimm.c +++ b/hw/mem/nvdimm.c @@ -26,6 +26,7 @@ #include "qapi/error.h" #include "qapi/visitor.h" #include "hw/mem/nvdimm.h" +#include "qemu/error-report.h" static void nvdimm_get_label_size(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) @@ -78,12 +79,48 @@ static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm) return &nvdimm->nvdimm_mr; } +static void nvdimm_check_dax(HostMemoryBackend *hostmem) +{ + char *mem_path = + object_property_get_str(OBJECT(hostmem), "mem-path", NULL); + char *dev_name = NULL, *sysfs_path = NULL; + bool is_dax = false; + + if (!mem_path) { + goto out; + } + + if (!g_str_has_prefix(mem_path, "/dev/dax")) { + goto out; + } + + dev_name = mem_path + strlen("/dev/"); + sysfs_path = g_strdup_printf("/sys/class/dax/%s", dev_name); + if (access(sysfs_path, F_OK)) { + goto out; + } + + is_dax = true; + + out: + if (!is_dax) { + error_report("warning: nvdimm backend %s is not DAX device, " + "unable to guarantee persistence of guest writes", + mem_path ?: "RAM"); + } + + g_free(sysfs_path); + g_free(mem_path); +} + static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp) { MemoryRegion *mr = host_memory_backend_get_memory(dimm->hostmem, errp); NVDIMMDevice *nvdimm = NVDIMM(dimm); uint64_t align, pmem_size, size = memory_region_size(mr); + nvdimm_check_dax(dimm->hostmem); + align = memory_region_get_alignment(mr); pmem_size = size - nvdimm->label_size; -- 2.11.0