Re: [PATCH-for-5.1?] util/pagesize: Make qemu_real_host_page_size of type size_t

[Stefano Garzarella]

On Thu, Jul 30, 2020 at 03:59:35PM +0200, Philippe Mathieu-Daudé wrote:
> We use different types to hold 'qemu_real_host_page_size'.
> Unify picking 'size_t' which seems the best candidate.

I agree, it sounds better!

Should we change even "qemu_host_page_size"?

Thanks,
Stefano

> 
> Doing so fix a format string issue in hw/virtio/virtio-mem.c
> reported when building with GCC 4.9.4:
> 
>   hw/virtio/virtio-mem.c: In function ‘virtio_mem_set_block_size’:
>   hw/virtio/virtio-mem.c:756:9: error: format ‘%x’ expects argument of type 
> ‘unsigned int’, but argument 7 has type ‘uintptr_t’ [-Werror=format=]
>          error_setg(errp, "'%s' property has to be at least 0x%" PRIx32, name,
>          ^
> 
> Fixes: 910b25766b ("virtio-mem: Paravirtualized memory hot(un)plug")
> Reported-by: Bruce Rogers <brogers@suse.com>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  include/exec/ram_addr.h  | 4 ++--
>  include/qemu/osdep.h     | 2 +-
>  accel/kvm/kvm-all.c      | 3 ++-
>  block/qcow2-cache.c      | 2 +-
>  exec.c                   | 8 ++++----
>  hw/ppc/spapr_pci.c       | 2 +-
>  hw/virtio/virtio-mem.c   | 2 +-
>  migration/migration.c    | 2 +-
>  migration/postcopy-ram.c | 2 +-
>  monitor/misc.c           | 2 +-
>  util/pagesize.c          | 2 +-
>  11 files changed, 16 insertions(+), 15 deletions(-)
> 
> diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
> index 3ef729a23c..e07532266e 100644
> --- a/include/exec/ram_addr.h
> +++ b/include/exec/ram_addr.h
> @@ -93,8 +93,8 @@ static inline unsigned long int 
> ramblock_recv_bitmap_offset(void *host_addr,
>  
>  bool ramblock_is_pmem(RAMBlock *rb);
>  
> -long qemu_minrampagesize(void);
> -long qemu_maxrampagesize(void);
> +size_t qemu_minrampagesize(void);
> +size_t qemu_maxrampagesize(void);
>  
>  /**
>   * qemu_ram_alloc_from_file,
> diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
> index 20872e793e..619b8a7a8c 100644
> --- a/include/qemu/osdep.h
> +++ b/include/qemu/osdep.h
> @@ -635,10 +635,10 @@ char *qemu_get_pid_name(pid_t pid);
>   */
>  pid_t qemu_fork(Error **errp);
>  
> +extern size_t qemu_real_host_page_size;
>  /* Using intptr_t ensures that qemu_*_page_mask is sign-extended even
>   * when intptr_t is 32-bit and we are aligning a long long.
>   */
> -extern uintptr_t qemu_real_host_page_size;
>  extern intptr_t qemu_real_host_page_mask;
>  
>  extern int qemu_icache_linesize;
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index 63ef6af9a1..59becfbd6c 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -674,7 +674,8 @@ static int kvm_log_clear_one_slot(KVMSlot *mem, int 
> as_id, uint64_t start,
>      KVMState *s = kvm_state;
>      uint64_t end, bmap_start, start_delta, bmap_npages;
>      struct kvm_clear_dirty_log d;
> -    unsigned long *bmap_clear = NULL, psize = qemu_real_host_page_size;
> +    unsigned long *bmap_clear = NULL;
> +    size_t psize = qemu_real_host_page_size;
>      int ret;
>  
>      /*
> diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c
> index 7444b9c4ab..4ad9f5929f 100644
> --- a/block/qcow2-cache.c
> +++ b/block/qcow2-cache.c
> @@ -74,7 +74,7 @@ static void qcow2_cache_table_release(Qcow2Cache *c, int i, 
> int num_tables)
>  /* Using MADV_DONTNEED to discard memory is a Linux-specific feature */
>  #ifdef CONFIG_LINUX
>      void *t = qcow2_cache_get_table_addr(c, i);
> -    int align = qemu_real_host_page_size;
> +    size_t align = qemu_real_host_page_size;
>      size_t mem_size = (size_t) c->table_size * num_tables;
>      size_t offset = QEMU_ALIGN_UP((uintptr_t) t, align) - (uintptr_t) t;
>      size_t length = QEMU_ALIGN_DOWN(mem_size - offset, align);
> diff --git a/exec.c b/exec.c
> index 6f381f98e2..4b6d52e01f 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -1657,7 +1657,7 @@ static int find_max_backend_pagesize(Object *obj, void 
> *opaque)
>   * TODO: We assume right now that all mapped host memory backends are
>   * used as RAM, however some might be used for different purposes.
>   */
> -long qemu_minrampagesize(void)
> +size_t qemu_minrampagesize(void)
>  {
>      long hpsize = LONG_MAX;
>      Object *memdev_root = object_resolve_path("/objects", NULL);
> @@ -1666,7 +1666,7 @@ long qemu_minrampagesize(void)
>      return hpsize;
>  }
>  
> -long qemu_maxrampagesize(void)
> +size_t qemu_maxrampagesize(void)
>  {
>      long pagesize = 0;
>      Object *memdev_root = object_resolve_path("/objects", NULL);
> @@ -1675,11 +1675,11 @@ long qemu_maxrampagesize(void)
>      return pagesize;
>  }
>  #else
> -long qemu_minrampagesize(void)
> +size_t qemu_minrampagesize(void)
>  {
>      return qemu_real_host_page_size;
>  }
> -long qemu_maxrampagesize(void)
> +size_t qemu_maxrampagesize(void)
>  {
>      return qemu_real_host_page_size;
>  }
> diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> index 363cdb3f7b..a9da84fe30 100644
> --- a/hw/ppc/spapr_pci.c
> +++ b/hw/ppc/spapr_pci.c
> @@ -1810,7 +1810,7 @@ static void spapr_phb_realize(DeviceState *dev, Error 
> **errp)
>      char *namebuf;
>      int i;
>      PCIBus *bus;
> -    uint64_t msi_window_size = 4096;
> +    size_t msi_window_size = 4096;
>      SpaprTceTable *tcet;
>      const unsigned windows_supported = spapr_phb_windows_supported(sphb);
>      Error *local_err = NULL;
> diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
> index c12e9f79b0..34344cec39 100644
> --- a/hw/virtio/virtio-mem.c
> +++ b/hw/virtio/virtio-mem.c
> @@ -753,7 +753,7 @@ static void virtio_mem_set_block_size(Object *obj, 
> Visitor *v, const char *name,
>      }
>  
>      if (value < VIRTIO_MEM_MIN_BLOCK_SIZE) {
> -        error_setg(errp, "'%s' property has to be at least 0x%" PRIx32, name,
> +        error_setg(errp, "'%s' property has to be at least 0x%zx", name,
>                     VIRTIO_MEM_MIN_BLOCK_SIZE);
>          return;
>      } else if (!is_power_of_2(value)) {
> diff --git a/migration/migration.c b/migration/migration.c
> index 8fe36339db..b8abbbeabb 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -2433,7 +2433,7 @@ static struct rp_cmd_args {
>  static void migrate_handle_rp_req_pages(MigrationState *ms, const char* 
> rbname,
>                                         ram_addr_t start, size_t len)
>  {
> -    long our_host_ps = qemu_real_host_page_size;
> +    size_t our_host_ps = qemu_real_host_page_size;
>  
>      trace_migrate_handle_rp_req_pages(rbname, start, len);
>  
> diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
> index 1bb22f2b6c..f296efd612 100644
> --- a/migration/postcopy-ram.c
> +++ b/migration/postcopy-ram.c
> @@ -345,7 +345,7 @@ static int test_ramblock_postcopiable(RAMBlock *rb, void 
> *opaque)
>   */
>  bool postcopy_ram_supported_by_host(MigrationIncomingState *mis)
>  {
> -    long pagesize = qemu_real_host_page_size;
> +    size_t pagesize = qemu_real_host_page_size;
>      int ufd = -1;
>      bool ret = false; /* Error unless we change it */
>      void *testarea = NULL;
> diff --git a/monitor/misc.c b/monitor/misc.c
> index e847b58a8c..7970f4ff72 100644
> --- a/monitor/misc.c
> +++ b/monitor/misc.c
> @@ -740,7 +740,7 @@ static uint64_t vtop(void *ptr, Error **errp)
>      uint64_t pinfo;
>      uint64_t ret = -1;
>      uintptr_t addr = (uintptr_t) ptr;
> -    uintptr_t pagesize = qemu_real_host_page_size;
> +    size_t pagesize = qemu_real_host_page_size;
>      off_t offset = addr / pagesize * sizeof(pinfo);
>      int fd;
>  
> diff --git a/util/pagesize.c b/util/pagesize.c
> index 998632cf6e..a08bf1717a 100644
> --- a/util/pagesize.c
> +++ b/util/pagesize.c
> @@ -8,7 +8,7 @@
>  
>  #include "qemu/osdep.h"
>  
> -uintptr_t qemu_real_host_page_size;
> +size_t qemu_real_host_page_size;
>  intptr_t qemu_real_host_page_mask;
>  
>  static void __attribute__((constructor)) init_real_host_page_size(void)
> -- 
> 2.21.3
>