Re: [Qemu-devel] [PATCH v3 06/12] memory: Pass mr into snapshot_and_clear_dirty

[Peter Xu <peterx@redhat.com>]

On Thu, May 30, 2019 at 12:22:00PM +0100, Dr. David Alan Gilbert wrote:
> * Peter Xu (peterx@redhat.com) wrote:
> > Also we change the 2nd parameter of it to be the relative offset
> > within the memory region. This is to be used in follow up patches.
> > 
> > Signed-off-by: Peter Xu <peterx@redhat.com>
> > ---
> >  exec.c                  | 3 ++-
> >  include/exec/ram_addr.h | 2 +-
> >  memory.c                | 3 +--
> >  3 files changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/exec.c b/exec.c
> > index 4e734770c2..2615b4cfed 100644
> > --- a/exec.c
> > +++ b/exec.c
> > @@ -1387,9 +1387,10 @@ bool cpu_physical_memory_test_and_clear_dirty(ram_addr_t start,
> >  }
> >  
> >  DirtyBitmapSnapshot *cpu_physical_memory_snapshot_and_clear_dirty
> > -     (ram_addr_t start, ram_addr_t length, unsigned client)
> > +(MemoryRegion *mr, hwaddr addr, hwaddr length, unsigned client)
> 
> Better to keep some indent?

Ok.  Emacs did it automatically for me without being noticed.  The
previous 5-spaces is odd, I'll use 4 spaces.

> 
> >  {
> >      DirtyMemoryBlocks *blocks;
> > +    ram_addr_t start = memory_region_get_ram_addr(mr) + addr;
> >      unsigned long align = 1UL << (TARGET_PAGE_BITS + BITS_PER_LEVEL);
> >      ram_addr_t first = QEMU_ALIGN_DOWN(start, align);
> >      ram_addr_t last  = QEMU_ALIGN_UP(start + length, align);
> > diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
> > index 79e70a96ee..f8ee011d3c 100644
> > --- a/include/exec/ram_addr.h
> > +++ b/include/exec/ram_addr.h
> > @@ -403,7 +403,7 @@ bool cpu_physical_memory_test_and_clear_dirty(ram_addr_t start,
> >                                                unsigned client);
> >  
> >  DirtyBitmapSnapshot *cpu_physical_memory_snapshot_and_clear_dirty
> > -    (ram_addr_t start, ram_addr_t length, unsigned client);
> > +(MemoryRegion *mr, ram_addr_t start, hwaddr length, unsigned client);
> 
> You've called it 'start' there but 'addr' in the definition.
> Either way a comment saying that it's the offset with mr would be good.

Right I missed that.  Let me directly rename it to "offset" in both
places to be clear.  Also, I should use hwaddr rather than ram_addr_t,
and I'll fix the indent too here.

-- 
Peter Xu