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