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From 5e258b59991284cf2e6bfcac04ff2de01dc83005 Mon Sep 17 00:00:00 2001
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From: "plai@redhat.com" <plai@redhat.com>
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Date: Tue, 20 Aug 2019 16:12:48 +0100
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Subject: [PATCH 01/11] util/mmap-alloc: Add a 'is_pmem' parameter to
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qemu_ram_mmap
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: plai@redhat.com
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Message-id: <1566317571-5697-2-git-send-email-plai@redhat.com>
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Patchwork-id: 90084
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O-Subject: [RHEL8.2 qemu-kvm PATCH 1/4] util/mmap-alloc: Add a 'is_pmem' parameter to qemu_ram_mmap
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Bugzilla: 1539282
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Pankaj Gupta <pagupta@redhat.com>
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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From: Zhang Yi <yi.z.zhang@linux.intel.com>
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besides the existing 'shared' flags, we are going to add
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'is_pmem' to qemu_ram_mmap(), which indicated the memory backend
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file is a persist memory.
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Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
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Signed-off-by: Zhang Yi <yi.z.zhang@linux.intel.com>
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Reviewed-by: Pankaj Gupta <pagupta@redhat.com>
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Message-Id: <786c46862cfeb253ee0ea2f44d62ffe76edb7fa4.1549555521.git.yi.z.zhang@linux.intel.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Pankaj Gupta <pagupta@redhat.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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(cherry picked from commit 2ac0f1621c9be59eebc844fa10361a84fd726185)
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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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---
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exec.c | 2 +-
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include/qemu/mmap-alloc.h | 21 ++++++++++++++++++++-
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util/mmap-alloc.c | 6 +++++-
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util/oslib-posix.c | 2 +-
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4 files changed, 27 insertions(+), 4 deletions(-)
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diff --git a/exec.c b/exec.c
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index 9028700..a79eaa3 100644
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--- a/exec.c
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+++ b/exec.c
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@@ -1669,7 +1669,7 @@ static void *file_ram_alloc(RAMBlock *block,
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}
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area = qemu_ram_mmap(fd, memory, block->mr->align,
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- block->flags & RAM_SHARED);
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+ block->flags & RAM_SHARED, block->flags & RAM_PMEM);
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if (area == MAP_FAILED) {
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error_setg_errno(errp, errno,
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"unable to map backing store for guest RAM");
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diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h
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index 50385e3..190688a 100644
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--- a/include/qemu/mmap-alloc.h
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+++ b/include/qemu/mmap-alloc.h
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@@ -7,7 +7,26 @@ size_t qemu_fd_getpagesize(int fd);
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size_t qemu_mempath_getpagesize(const char *mem_path);
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-void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared);
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+/**
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+ * qemu_ram_mmap: mmap the specified file or device.
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+ *
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+ * Parameters:
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+ * @fd: the file or the device to mmap
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+ * @size: the number of bytes to be mmaped
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+ * @align: if not zero, specify the alignment of the starting mapping address;
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+ * otherwise, the alignment in use will be determined by QEMU.
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+ * @shared: map has RAM_SHARED flag.
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+ * @is_pmem: map has RAM_PMEM flag.
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+ *
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+ * Return:
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+ * On success, return a pointer to the mapped area.
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+ * On failure, return MAP_FAILED.
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+ */
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+void *qemu_ram_mmap(int fd,
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+ size_t size,
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+ size_t align,
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+ bool shared,
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+ bool is_pmem);
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void qemu_ram_munmap(void *ptr, size_t size);
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diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
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index 2fd8cbc..55d1890 100644
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--- a/util/mmap-alloc.c
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+++ b/util/mmap-alloc.c
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@@ -73,7 +73,11 @@ size_t qemu_mempath_getpagesize(const char *mem_path)
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return getpagesize();
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}
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-void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared)
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+void *qemu_ram_mmap(int fd,
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+ size_t size,
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+ size_t align,
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+ bool shared,
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+ bool is_pmem)
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{
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/*
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* Note: this always allocates at least one extra page of virtual address
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diff --git a/util/oslib-posix.c b/util/oslib-posix.c
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index 13b6f8d..c36b2bb 100644
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--- a/util/oslib-posix.c
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+++ b/util/oslib-posix.c
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@@ -130,7 +130,7 @@ void *qemu_memalign(size_t alignment, size_t size)
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void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment, bool shared)
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{
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size_t align = QEMU_VMALLOC_ALIGN;
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- void *ptr = qemu_ram_mmap(-1, size, align, shared);
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+ void *ptr = qemu_ram_mmap(-1, size, align, shared, false);
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if (ptr == MAP_FAILED) {
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return NULL;
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--
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1.8.3.1
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