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Re: [Qemu-devel] 0.15.0-rc2 (any version past 0.14.1) having issues with


From: Anthony Liguori
Subject: Re: [Qemu-devel] 0.15.0-rc2 (any version past 0.14.1) having issues with SLIRP on Windows XP host
Date: Sat, 06 Aug 2011 08:33:37 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110516 Lightning/1.0b2 Thunderbird/3.1.10

On 08/05/2011 10:25 PM, TeLeMan wrote:
On Sat, Aug 6, 2011 at 04:46, Blue Swirl<address@hidden>  wrote:
On Fri, Aug 5, 2011 at 8:09 PM, Kenneth Salerno
<address@hidden>  wrote:
Hi,

I'm not sure if any defaults (build or runtime) have changed since 0.14.1, but 
I can no longer get the following to work anymore for QEMU versions 0.15.0-rc2 
or recent development builds:

  -device e1000,netdev=mynet0 -netdev type=user,id=mynet0 ...

Works great in 0.14.1 however.

 From the QEMU console, "info networking" shows the NIC e1000 and the VLAN 
correctly setup, the guest (RHEL 6.1 x86_64) has its NIC recognized and networking setup, 
just can't seem to communicate with the gateway (10.0.2.2). The only difference I see in 
the console is cosmetic (restricted=off rather than restricted=n).

Host OS: Windows XP
Build env: i686-pc-mingw32-gcc 4.5.2, binutils 2.21.53.20110731 i386pe
Runtime env: Cygwin 1.7.9 2011-03-29, SDL 1.2.14, mingw32-glib 2.28.1-1,
             mingw32-gettext 0.18.1-2
Guest OS: RHEL 6.1

Is it just me?

No, this is fallout from glib use:
http://lists.nongnu.org/archive/html/qemu-devel/2011-08/msg00134.html

The fix is to rewrite structures without using GCC bit fields.

-mms-bitfields affects all byte-alignments in a structure. For example,
struct s
{
    uint8_t a;
    uint32_t b;
} __attribute__((packed));

sizeof(s) is 5 without -mms-bitfields but sizeof(s) is 8 with -mms-bitfields.

If you can identify the offending structs, you can do:

#pragma pack(push,1)

struct s
{
    uint8_t a;
    uint32_t b;
} __attribute__((packed));

#pragma pack(pop)

Regards,

Anthony Liguori




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