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From: Paolo Bonzini <pbonzini@redhat.com>
To: Anthony PERARD <anthony.perard@citrix.com>, qemu-devel@nongnu.org
Cc: Peter Crosthwaite <crosthwaite.peter@gmail.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Richard Henderson <rth@twiddle.net>,
	xen-devel@lists.xen.org
Subject: Re: [PATCH] exec: Fix qemu_ram_block_from_host for Xen
Date: Mon, 13 Jun 2016 10:16:30 +0200	[thread overview]
Message-ID: <7faa3e52-4957-90dc-5060-581c3c6a3cc3__37081.8421048627$1465805869$gmane$org@redhat.com> (raw)
In-Reply-To: <20160609155617.6650-1-anthony.perard@citrix.com>



On 09/06/2016 17:56, Anthony PERARD wrote:
> Since f615f39 (exec: remove ram_addr argument from
> qemu_ram_block_from_host), migration under Xen is likely to fail, with a
> SEGV of QEMU. But the commit only reveal a bug with the calculation of
> the offset value in qemu_ram_block_from_host().
> 
> This patch calculates the offset from the ram_addr as
> qemu_ram_addr_from_host() will later calculate the ram_addr from the
> offset.
> 
> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
> ---
>  exec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/exec.c b/exec.c
> index f2c9e37..f13106d 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -1935,7 +1935,7 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
>          ram_addr = xen_ram_addr_from_mapcache(ptr);
>          block = qemu_get_ram_block(ram_addr);
>          if (block) {
> -            *offset = (host - block->host);
> +            *offset = ram_addr - block->offset;
>          }
>          rcu_read_unlock();
>          return block;
> 

Acked-by: Paolo Bonzini <pbonzini@redhat.com>

Feel free to send a pull request yourself!

Thanks, and sorry for the breakage.  Indeed the broken code comes from
commit 422148d3e56c3c9a07c0cf36c1e0a0b76f09c357.

Paolo

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       reply	other threads:[~2016-06-13  8:16 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20160609155617.6650-1-anthony.perard@citrix.com>
2016-06-13  8:16 ` Paolo Bonzini [this message]
2016-06-09 15:56 Anthony PERARD

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