Merge remote-tracking branch 'remotes/bonzini-gitlab/tags/for-upstream' into staging

* Some Meson test conversions
* KVM dirty page ring buffer fix
* KVM TSC scaling support
* Fixes for SG_IO with /dev/sdX devices
* (Non)support for host devices on iOS
* -smp cleanups

# gpg: Signature made Fri 25 Jun 2021 15:16:18 BST
# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* remotes/bonzini-gitlab/tags/for-upstream: (28 commits)
  machine: reject -smp dies!=1 for non-PC machines
  machine: pass QAPI struct to mc->smp_parse
  machine: add error propagation to mc->smp_parse
  machine: move common smp_parse code to caller
  machine: move dies from X86MachineState to CpuTopology
  file-posix: handle EINTR during ioctl
  block: detect DKIOCGETBLOCKCOUNT/SIZE before use
  block: try BSD disk size ioctls one after another
  block: check for sys/disk.h
  block: feature detection for host block support
  file-posix: try BLKSECTGET on block devices too, do not round to power of 2
  block: add max_hw_transfer to BlockLimits
  block-backend: align max_transfer to request alignment
  osdep: provide ROUND_DOWN macro
  scsi-generic: pass max_segments via max_iov field in BlockLimits
  file-posix: fix max_iov for /dev/sg devices
  KVM: Fix dirty ring mmap incorrect size due to renaming accident
  configure, meson: convert libusbredir detection to meson
  configure, meson: convert libcacard detection to meson
  configure, meson: convert libusb detection to meson
  ...

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

3 files changed, 101 insertions, 56 deletions

diff --git a/block/block-backend.c b/block/block-backend.c
index 15f1ea4288..deb55c272e 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1953,16 +1953,29 @@ uint32_t blk_get_request_alignment(BlockBackend *blk)
     return bs ? bs->bl.request_alignment : BDRV_SECTOR_SIZE;
 }
 
+/* Returns the maximum hardware transfer length, in bytes; guaranteed nonzero */
+uint64_t blk_get_max_hw_transfer(BlockBackend *blk)
+{
+    BlockDriverState *bs = blk_bs(blk);
+    uint64_t max = INT_MAX;
+
+    if (bs) {
+        max = MIN_NON_ZERO(max, bs->bl.max_hw_transfer);
+        max = MIN_NON_ZERO(max, bs->bl.max_transfer);
+    }
+    return ROUND_DOWN(max, blk_get_request_alignment(blk));
+}
+
 /* Returns the maximum transfer length, in bytes; guaranteed nonzero */
 uint32_t blk_get_max_transfer(BlockBackend *blk)
 {
     BlockDriverState *bs = blk_bs(blk);
-    uint32_t max = 0;
+    uint32_t max = INT_MAX;
 
     if (bs) {
-        max = bs->bl.max_transfer;
+        max = MIN_NON_ZERO(max, bs->bl.max_transfer);
     }
-    return MIN_NON_ZERO(max, INT_MAX);
+    return ROUND_DOWN(max, blk_get_request_alignment(blk));
 }
 
 int blk_get_max_iov(BlockBackend *blk)
diff --git a/block/file-posix.c b/block/file-posix.c
index b3fbb9bd63..a26eab0ac3 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -42,6 +42,8 @@
 #include "scsi/constants.h"
 
 #if defined(__APPLE__) && (__MACH__)
+#include <sys/ioctl.h>
+#if defined(HAVE_HOST_BLOCK_DEVICE)
 #include <paths.h>
 #include <sys/param.h>
 #include <IOKit/IOKitLib.h>
@@ -52,6 +54,7 @@
 //#include <IOKit/storage/IOCDTypes.h>
 #include <IOKit/storage/IODVDMedia.h>
 #include <CoreFoundation/CoreFoundation.h>
+#endif /* defined(HAVE_HOST_BLOCK_DEVICE) */
 #endif
 
 #ifdef __sun__
@@ -178,7 +181,17 @@ typedef struct BDRVRawReopenState {
     bool check_cache_dropped;
 } BDRVRawReopenState;
 
-static int fd_open(BlockDriverState *bs);
+static int fd_open(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+
+    /* this is just to ensure s->fd is sane (its called by io ops) */
+    if (s->fd >= 0) {
+        return 0;
+    }
+    return -EIO;
+}
+
 static int64_t raw_getlength(BlockDriverState *bs);
 
 typedef struct RawPosixAIOData {
@@ -1147,22 +1160,27 @@ static void raw_reopen_abort(BDRVReopenState *state)
     s->reopen_state = NULL;
 }
 
-static int sg_get_max_transfer_length(int fd)
+static int hdev_get_max_hw_transfer(int fd, struct stat *st)
 {
 #ifdef BLKSECTGET
-    int max_bytes = 0;
-
-    if (ioctl(fd, BLKSECTGET, &max_bytes) == 0) {
-        return max_bytes;
+    if (S_ISBLK(st->st_mode)) {
+        unsigned short max_sectors = 0;
+        if (ioctl(fd, BLKSECTGET, &max_sectors) == 0) {
+            return max_sectors * 512;
+        }
     } else {
-        return -errno;
+        int max_bytes = 0;
+        if (ioctl(fd, BLKSECTGET, &max_bytes) == 0) {
+            return max_bytes;
+        }
     }
+    return -errno;
 #else
     return -ENOSYS;
 #endif
 }
 
-static int sg_get_max_segments(int fd)
+static int hdev_get_max_segments(int fd, struct stat *st)
 {
 #ifdef CONFIG_LINUX
     char buf[32];
@@ -1171,15 +1189,20 @@ static int sg_get_max_segments(int fd)
     int ret;
     int sysfd = -1;
     long max_segments;
-    struct stat st;
 
-    if (fstat(fd, &st)) {
-        ret = -errno;
-        goto out;
+    if (S_ISCHR(st->st_mode)) {
+        if (ioctl(fd, SG_GET_SG_TABLESIZE, &ret) == 0) {
+            return ret;
+        }
+        return -ENOTSUP;
+    }
+
+    if (!S_ISBLK(st->st_mode)) {
+        return -ENOTSUP;
     }
 
     sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments",
-                                major(st.st_rdev), minor(st.st_rdev));
+                                major(st->st_rdev), minor(st->st_rdev));
     sysfd = open(sysfspath, O_RDONLY);
     if (sysfd == -1) {
         ret = -errno;
@@ -1216,24 +1239,33 @@ out:
 static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
 {
     BDRVRawState *s = bs->opaque;
+    struct stat st;
+
+    raw_probe_alignment(bs, s->fd, errp);
+    bs->bl.min_mem_alignment = s->buf_align;
+    bs->bl.opt_mem_alignment = MAX(s->buf_align, qemu_real_host_page_size);
+
+    /*
+     * Maximum transfers are best effort, so it is okay to ignore any
+     * errors.  That said, based on the man page errors in fstat would be
+     * very much unexpected; the only possible case seems to be ENOMEM.
+     */
+    if (fstat(s->fd, &st)) {
+        return;
+    }
 
-    if (bs->sg) {
-        int ret = sg_get_max_transfer_length(s->fd);
+    if (bs->sg || S_ISBLK(st.st_mode)) {
+        int ret = hdev_get_max_hw_transfer(s->fd, &st);
 
         if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) {
-            bs->bl.max_transfer = pow2floor(ret);
+            bs->bl.max_hw_transfer = ret;
         }
 
-        ret = sg_get_max_segments(s->fd);
+        ret = hdev_get_max_segments(s->fd, &st);
         if (ret > 0) {
-            bs->bl.max_transfer = MIN(bs->bl.max_transfer,
-                                      ret * qemu_real_host_page_size);
+            bs->bl.max_iov = ret;
         }
     }
-
-    raw_probe_alignment(bs, s->fd, errp);
-    bs->bl.min_mem_alignment = s->buf_align;
-    bs->bl.opt_mem_alignment = MAX(s->buf_align, qemu_real_host_page_size);
 }
 
 static int check_for_dasd(int fd)
@@ -1315,7 +1347,9 @@ static int handle_aiocb_ioctl(void *opaque)
     RawPosixAIOData *aiocb = opaque;
     int ret;
 
-    ret = ioctl(aiocb->aio_fildes, aiocb->ioctl.cmd, aiocb->ioctl.buf);
+    do {
+        ret = ioctl(aiocb->aio_fildes, aiocb->ioctl.cmd, aiocb->ioctl.buf);
+    } while (ret == -1 && errno == EINTR);
     if (ret == -1) {
         return -errno;
     }
@@ -2295,39 +2329,37 @@ static int64_t raw_getlength(BlockDriverState *bs)
 again:
 #endif
     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
+        size = 0;
 #ifdef DIOCGMEDIASIZE
-        if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
-#elif defined(DIOCGPART)
-        {
-                struct partinfo pi;
-                if (ioctl(fd, DIOCGPART, &pi) == 0)
-                        size = pi.media_size;
-                else
-                        size = 0;
+        if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size)) {
+            size = 0;
         }
-        if (size == 0)
 #endif
-#if defined(__APPLE__) && defined(__MACH__)
-        {
+#ifdef DIOCGPART
+        if (size == 0) {
+            struct partinfo pi;
+            if (ioctl(fd, DIOCGPART, &pi) == 0) {
+                size = pi.media_size;
+            }
+        }
+#endif
+#if defined(DKIOCGETBLOCKCOUNT) && defined(DKIOCGETBLOCKSIZE)
+        if (size == 0) {
             uint64_t sectors = 0;
             uint32_t sector_size = 0;
 
             if (ioctl(fd, DKIOCGETBLOCKCOUNT, &sectors) == 0
                && ioctl(fd, DKIOCGETBLOCKSIZE, &sector_size) == 0) {
                 size = sectors * sector_size;
-            } else {
-                size = lseek(fd, 0LL, SEEK_END);
-                if (size < 0) {
-                    return -errno;
-                }
             }
         }
-#else
-        size = lseek(fd, 0LL, SEEK_END);
+#endif
+        if (size == 0) {
+            size = lseek(fd, 0LL, SEEK_END);
+        }
         if (size < 0) {
             return -errno;
         }
-#endif
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
         switch(s->type) {
         case FTYPE_CD:
@@ -3014,6 +3046,7 @@ static BlockStatsSpecific *raw_get_specific_stats(BlockDriverState *bs)
     return stats;
 }
 
+#if defined(HAVE_HOST_BLOCK_DEVICE)
 static BlockStatsSpecific *hdev_get_specific_stats(BlockDriverState *bs)
 {
     BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1);
@@ -3023,6 +3056,7 @@ static BlockStatsSpecific *hdev_get_specific_stats(BlockDriverState *bs)
 
     return stats;
 }
+#endif /* HAVE_HOST_BLOCK_DEVICE */
 
 static QemuOptsList raw_create_opts = {
     .name = "raw-create-opts",
@@ -3238,6 +3272,8 @@ BlockDriver bdrv_file = {
 /***********************************************/
 /* host device */
 
+#if defined(HAVE_HOST_BLOCK_DEVICE)
+
 #if defined(__APPLE__) && defined(__MACH__)
 static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath,
                                 CFIndex maxPathSize, int flags);
@@ -3530,16 +3566,6 @@ hdev_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
 }
 #endif /* linux */
 
-static int fd_open(BlockDriverState *bs)
-{
-    BDRVRawState *s = bs->opaque;
-
-    /* this is just to ensure s->fd is sane (its called by io ops) */
-    if (s->fd >= 0)
-        return 0;
-    return -EIO;
-}
-
 static coroutine_fn int
 hdev_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
 {
@@ -3863,6 +3889,8 @@ static BlockDriver bdrv_host_cdrom = {
 };
 #endif /* __FreeBSD__ */
 
+#endif /* HAVE_HOST_BLOCK_DEVICE */
+
 static void bdrv_file_init(void)
 {
     /*
@@ -3870,6 +3898,7 @@ static void bdrv_file_init(void)
      * registered last will get probed first.
      */
     bdrv_register(&bdrv_file);
+#if defined(HAVE_HOST_BLOCK_DEVICE)
     bdrv_register(&bdrv_host_device);
 #ifdef __linux__
     bdrv_register(&bdrv_host_cdrom);
@@ -3877,6 +3906,7 @@ static void bdrv_file_init(void)
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
     bdrv_register(&bdrv_host_cdrom);
 #endif
+#endif /* HAVE_HOST_BLOCK_DEVICE */
 }
 
 block_init(bdrv_file_init);
diff --git a/block/io.c b/block/io.c
index 323854d063..dd93364258 100644
--- a/block/io.c
+++ b/block/io.c
@@ -127,6 +127,8 @@ static void bdrv_merge_limits(BlockLimits *dst, const BlockLimits *src)
 {
     dst->opt_transfer = MAX(dst->opt_transfer, src->opt_transfer);
     dst->max_transfer = MIN_NON_ZERO(dst->max_transfer, src->max_transfer);
+    dst->max_hw_transfer = MIN_NON_ZERO(dst->max_hw_transfer,
+                                        src->max_hw_transfer);
     dst->opt_mem_alignment = MAX(dst->opt_mem_alignment,
                                  src->opt_mem_alignment);
     dst->min_mem_alignment = MAX(dst->min_mem_alignment,