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Blame SOURCES/kvm-memory-exec-switch-file-ram-allocation-functions-to-.patch

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From 6a5885e65ce9daac0464a78c93a10c36f41b28ce 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 17:02:17 +0000
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Subject: [PATCH 16/22] memory, exec: switch file ram allocation functions to
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 'flags' parameters
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RH-Author: plai@redhat.com
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Message-id: <1546880543-24860-5-git-send-email-plai@redhat.com>
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Patchwork-id: 83889
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O-Subject: [RHEL8.0 qemu-kvm PATCH v7 04/10] memory, exec: switch file ram allocation functions to 'flags' parameters
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Bugzilla: 1539285
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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From: Junyan He <junyan.he@intel.com>
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As more flag parameters besides the existing 'share' are going to be
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added to following functions
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memory_region_init_ram_from_file
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qemu_ram_alloc_from_fd
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qemu_ram_alloc_from_file
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let's switch them to use the 'flags' parameters so as to ease future
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flag additions.
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The existing 'share' flag is converted to the RAM_SHARED bit in ram_flags,
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and other flag bits are ignored by above functions right now.
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Signed-off-by: Junyan He <junyan.he@intel.com>
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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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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
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(cherry picked from commit cbfc01710362f3de6fca3010a17b0e1c866fc181)
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Signed-off-by: Paul Lai <plai@redhat.com>
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Resovled Conflicts:
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	include/exec/ram_addr.h
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	memory.c
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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 backends/hostmem-file.c |  3 ++-
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 exec.c                  | 10 +++++-----
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 include/exec/memory.h   |  7 +++++--
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 include/exec/ram_addr.h | 25 +++++++++++++++++++++++--
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 memory.c                |  8 +++++---
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 numa.c                  |  2 +-
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 6 files changed, 41 insertions(+), 14 deletions(-)
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diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
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index 134b08d..34c68bb 100644
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--- a/backends/hostmem-file.c
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+++ b/backends/hostmem-file.c
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@@ -58,7 +58,8 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
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         path = object_get_canonical_path(OBJECT(backend));
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         memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
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                                  path,
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-                                 backend->size, fb->align, backend->share,
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+                                 backend->size, fb->align,
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+                                 backend->share ? RAM_SHARED : 0,
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                                  fb->mem_path, errp);
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         g_free(path);
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     }
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diff --git a/exec.c b/exec.c
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index b66377c..8d58e8f 100644
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--- a/exec.c
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+++ b/exec.c
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@@ -2042,7 +2042,7 @@ static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared)
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 #ifdef __linux__
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 RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
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-                                 bool share, int fd,
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+                                 uint32_t ram_flags, int fd,
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                                  Error **errp)
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 {
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     RAMBlock *new_block;
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@@ -2084,14 +2084,14 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
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     new_block->mr = mr;
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     new_block->used_length = size;
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     new_block->max_length = size;
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-    new_block->flags = share ? RAM_SHARED : 0;
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+    new_block->flags = ram_flags;
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     new_block->host = file_ram_alloc(new_block, size, fd, !file_size, errp);
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     if (!new_block->host) {
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         g_free(new_block);
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         return NULL;
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     }
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-    ram_block_add(new_block, &local_err, share);
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+    ram_block_add(new_block, &local_err, ram_flags & RAM_SHARED);
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     if (local_err) {
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         g_free(new_block);
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         error_propagate(errp, local_err);
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@@ -2103,7 +2103,7 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
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 RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
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-                                   bool share, const char *mem_path,
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+                                   uint32_t ram_flags, const char *mem_path,
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                                    Error **errp)
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 {
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     int fd;
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@@ -2115,7 +2115,7 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
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         return NULL;
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     }
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-    block = qemu_ram_alloc_from_fd(size, mr, share, fd, errp);
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+    block = qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, errp);
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     if (!block) {
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         if (created) {
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             unlink(mem_path);
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diff --git a/include/exec/memory.h b/include/exec/memory.h
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index db46501..b3abe61 100644
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--- a/include/exec/memory.h
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+++ b/include/exec/memory.h
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@@ -527,6 +527,7 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr,
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                                                        void *host),
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                                        Error **errp);
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 #ifdef __linux__
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+
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 /**
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  * memory_region_init_ram_from_file:  Initialize RAM memory region with a
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  *                                    mmap-ed backend.
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@@ -538,7 +539,9 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr,
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  * @size: size of the region.
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  * @align: alignment of the region base address; if 0, the default alignment
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  *         (getpagesize()) will be used.
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- * @share: %true if memory must be mmaped with the MAP_SHARED flag
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+ * @ram_flags: Memory region features:
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+ *             - RAM_SHARED: memory must be mmaped with the MAP_SHARED flag
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+ *             Other bits are ignored now.
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  * @path: the path in which to allocate the RAM.
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  * @errp: pointer to Error*, to store an error if it happens.
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  *
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@@ -550,7 +553,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
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                                       const char *name,
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                                       uint64_t size,
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                                       uint64_t align,
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-                                      bool share,
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+                                      uint32_t ram_flags,
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                                       const char *path,
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                                       Error **errp);
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diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
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index cf2446a..67e163e 100644
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--- a/include/exec/ram_addr.h
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+++ b/include/exec/ram_addr.h
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@@ -72,12 +72,33 @@ static inline unsigned long int ramblock_recv_bitmap_offset(void *host_addr,
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 long qemu_getrampagesize(void);
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 unsigned long last_ram_page(void);
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+
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+/**
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+ * qemu_ram_alloc_from_file,
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+ * qemu_ram_alloc_from_fd:  Allocate a ram block from the specified backing
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+ *                          file or device
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+ *
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+ * Parameters:
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+ *  @size: the size in bytes of the ram block
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+ *  @mr: the memory region where the ram block is
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+ *  @ram_flags: specify the properties of the ram block, which can be one
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+ *              or bit-or of following values
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+ *              - RAM_SHARED: mmap the backing file or device with MAP_SHARED
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+ *              Other bits are ignored.
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+ *  @mem_path or @fd: specify the backing file or device
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+ *  @errp: pointer to Error*, to store an error if it happens
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+ *
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+ * Return:
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+ *  On success, return a pointer to the ram block.
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+ *  On failure, return NULL.
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+ */
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 RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
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-                                   bool share, const char *mem_path,
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+                                   uint32_t ram_flags, const char *mem_path,
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                                    Error **errp);
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 RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
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-                                 bool share, int fd,
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+                                 uint32_t ram_flags, int fd,
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                                  Error **errp);
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+
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 RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
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                                   MemoryRegion *mr, Error **errp);
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 RAMBlock *qemu_ram_alloc(ram_addr_t size, bool share, MemoryRegion *mr,
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diff --git a/memory.c b/memory.c
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index 1a99b9c..4974f97 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -1564,7 +1564,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
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                                       const char *name,
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                                       uint64_t size,
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                                       uint64_t align,
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-                                      bool share,
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+                                      uint32_t ram_flags,
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                                       const char *path,
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                                       Error **errp)
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 {
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@@ -1574,7 +1574,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
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     mr->terminates = true;
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     mr->destructor = memory_region_destructor_ram;
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     mr->align = align;
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-    mr->ram_block = qemu_ram_alloc_from_file(size, mr, share, path, &err;;
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+    mr->ram_block = qemu_ram_alloc_from_file(size, mr, ram_flags, path, &err;;
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     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
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     if (err) {
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         mr->size = int128_zero();
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@@ -1596,7 +1596,9 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr,
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     mr->ram = true;
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     mr->terminates = true;
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     mr->destructor = memory_region_destructor_ram;
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-    mr->ram_block = qemu_ram_alloc_from_fd(size, mr, share, fd, &err;;
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+    mr->ram_block = qemu_ram_alloc_from_fd(size, mr,
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+                                           share ? RAM_SHARED : 0,
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+                                           fd, &err;;
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     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
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     if (err) {
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         mr->size = int128_zero();
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diff --git a/numa.c b/numa.c
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index a767a9d..6ea8a86 100644
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--- a/numa.c
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+++ b/numa.c
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@@ -456,7 +456,7 @@ static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner,
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     if (mem_path) {
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 #ifdef __linux__
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         Error *err = NULL;
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-        memory_region_init_ram_from_file(mr, owner, name, ram_size, 0, false,
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+        memory_region_init_ram_from_file(mr, owner, name, ram_size, 0, 0,
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                                          mem_path, &err;;
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         if (err) {
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             error_report_err(err);
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-- 
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1.8.3.1
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