Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-4.0-20190204' into staging

ppc patch queue 2019-02-04

Here's the next batch of ppc target and spapr related changes.
Highlights are:
 * A number of endianness handling cleanups from Mark Cave-Ayland
 * Updated Mac VGA driver
 * Updated SLOF image
 * Some XIVE cleanups and small fixes
 * ppc4xx cleanups and fixes from BALATON Zoltan

There are a few chances not technically in the ppc target code:
 * Several MAINTAINERS updates
 * Fixes for unmapping of hugepages on power hosts

The latter is included because it's primarily of interest for ppc KVM setups.

# gpg: Signature made Mon 04 Feb 2019 07:52:26 GMT
# gpg:                using RSA key 75F46586AE61A66CC44E87DC6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>" [full]
# gpg:                 aka "David Gibson (Red Hat) <dgibson@redhat.com>" [full]
# gpg:                 aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>" [full]
# gpg:                 aka "David Gibson (kernel.org) <dwg@kernel.org>" [unknown]
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dgibson/tags/ppc-for-4.0-20190204: (37 commits)
  mmap-alloc: fix hugetlbfs misaligned length in ppc64
  mmap-alloc: unfold qemu_ram_mmap()
  hw/ppc: Don't include m48t59.h if it is not necessary
  spapr_pci: Fix endianness in assigned-addresses property
  target/ppc: remove various HOST_WORDS_BIGENDIAN hacks in int_helper.c
  target/ppc: remove ROTRu32 and ROTRu64 macros from int_helper.c
  target/ppc: simplify VEXT_SIGNED macro in int_helper.c
  target/ppc: eliminate use of EL_IDX macros from int_helper.c
  target/ppc: eliminate use of HI_IDX and LO_IDX macros from int_helper.c
  target/ppc: rework vmul{e,o}{s,u}{b,h,w} instructions to use Vsr* macros
  target/ppc: rework vmrg{l,h}{b,h,w} instructions to use Vsr* macros
  hw/ppc/spapr: Add support for "-vga cirrus"
  QemuMacDrivers: update qemu_vga.ndrv to 90c488d built from submodule
  MAINTAINERS: add myself as maintainer for Mac Old World and New World machines
  spapr: Drop unused parameters from fdt building helper
  MAINTAINERS: Merge the two e500 sections
  MAINTAINERS: XIVE is an interrupt controller, not a machine
  hw/ppc: Move ppc40x_*reset() functions from ppc405_uc.c to ppc.c
  ppc: remove the interrupt presenters from under PowerPCCPU
  target/ppc: implement complete set of Vsr* macros
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 49 insertions, 24 deletions

diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
index fd329eccd8..8565885420 100644
--- a/util/mmap-alloc.c
+++ b/util/mmap-alloc.c
@@ -77,11 +77,20 @@ size_t qemu_mempath_getpagesize(const char *mem_path)
 
 void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared)
 {
+    int flags;
+    int guardfd;
+    size_t offset;
+    size_t pagesize;
+    size_t total;
+    void *guardptr;
+    void *ptr;
+
     /*
      * Note: this always allocates at least one extra page of virtual address
      * space, even if size is already aligned.
      */
-    size_t total = size + align;
+    total = size + align;
+
 #if defined(__powerpc64__) && defined(__linux__)
     /* On ppc64 mappings in the same segment (aka slice) must share the same
      * page size. Since we will be re-allocating part of this segment
@@ -91,36 +100,45 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared)
      * We do this unless we are using the system page size, in which case
      * anonymous memory is OK.
      */
-    int anonfd = fd == -1 || qemu_fd_getpagesize(fd) == getpagesize() ? -1 : fd;
-    int flags = anonfd == -1 ? MAP_ANONYMOUS : MAP_NORESERVE;
-    void *ptr = mmap(0, total, PROT_NONE, flags | MAP_PRIVATE, anonfd, 0);
+    flags = MAP_PRIVATE;
+    pagesize = qemu_fd_getpagesize(fd);
+    if (fd == -1 || pagesize == getpagesize()) {
+        guardfd = -1;
+        flags |= MAP_ANONYMOUS;
+    } else {
+        guardfd = fd;
+        flags |= MAP_NORESERVE;
+    }
 #else
-    void *ptr = mmap(0, total, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+    guardfd = -1;
+    pagesize = getpagesize();
+    flags = MAP_PRIVATE | MAP_ANONYMOUS;
 #endif
-    size_t offset;
-    void *ptr1;
 
-    if (ptr == MAP_FAILED) {
+    guardptr = mmap(0, total, PROT_NONE, flags, guardfd, 0);
+
+    if (guardptr == MAP_FAILED) {
         return MAP_FAILED;
     }
 
     assert(is_power_of_2(align));
     /* Always align to host page size */
-    assert(align >= getpagesize());
-
-    offset = QEMU_ALIGN_UP((uintptr_t)ptr, align) - (uintptr_t)ptr;
-    ptr1 = mmap(ptr + offset, size, PROT_READ | PROT_WRITE,
-                MAP_FIXED |
-                (fd == -1 ? MAP_ANONYMOUS : 0) |
-                (shared ? MAP_SHARED : MAP_PRIVATE),
-                fd, 0);
-    if (ptr1 == MAP_FAILED) {
-        munmap(ptr, total);
+    assert(align >= pagesize);
+
+    flags = MAP_FIXED;
+    flags |= fd == -1 ? MAP_ANONYMOUS : 0;
+    flags |= shared ? MAP_SHARED : MAP_PRIVATE;
+    offset = QEMU_ALIGN_UP((uintptr_t)guardptr, align) - (uintptr_t)guardptr;
+
+    ptr = mmap(guardptr + offset, size, PROT_READ | PROT_WRITE, flags, fd, 0);
+
+    if (ptr == MAP_FAILED) {
+        munmap(guardptr, total);
         return MAP_FAILED;
     }
 
     if (offset > 0) {
-        munmap(ptr, offset);
+        munmap(guardptr, offset);
     }
 
     /*
@@ -128,17 +146,24 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared)
      * a guard page guarding against potential buffer overflows.
      */
     total -= offset;
-    if (total > size + getpagesize()) {
-        munmap(ptr1 + size + getpagesize(), total - size - getpagesize());
+    if (total > size + pagesize) {
+        munmap(ptr + size + pagesize, total - size - pagesize);
     }
 
-    return ptr1;
+    return ptr;
 }
 
-void qemu_ram_munmap(void *ptr, size_t size)
+void qemu_ram_munmap(int fd, void *ptr, size_t size)
 {
+    size_t pagesize;
+
     if (ptr) {
         /* Unmap both the RAM block and the guard page */
-        munmap(ptr, size + getpagesize());
+#if defined(__powerpc64__) && defined(__linux__)
+        pagesize = qemu_fd_getpagesize(fd);
+#else
+        pagesize = getpagesize();
+#endif
+        munmap(ptr, size + pagesize);
     }
 }