[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [PATCH v2] target-s390x: fix LOAD MULTIPLE instruction

From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH v2] target-s390x: fix LOAD MULTIPLE instruction on page boundary
Date: Tue, 26 May 2015 23:43:57 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

On 26.05.15 18:15, Richard Henderson wrote:
> On 05/26/2015 02:09 AM, Aurelien Jarno wrote:
>> This is an important detail in case the base register is in the list
>> of registers to be loaded. If a page fault occurs this register might be
>> overwritten and when the instruction is later restarted the wrong
>> base register value is useD.
>> Fix this by first loading the first and last value from memory, hence
>> triggering all possible page faults, and then the remaining registers.
>> This fixes random segmentation faults seen in the guest.
>> Cc: Alexander Graf <address@hidden>
>> Cc: Richard Henderson <address@hidden>
>> Signed-off-by: Aurelien Jarno <address@hidden>
>> ---
>>  target-s390x/translate.c | 128 
>> ++++++++++++++++++++++++++++++++++++-----------
>>  1 file changed, 99 insertions(+), 29 deletions(-)
>> Changes v1->v2:
>> - Do the load in two steps: first and last registers, and then the remaining 
>> ones
> Reviewed-by: Richard Henderson <address@hidden>

Thanks, applied to s390-next.

So what do we do about the other patch set?


reply via email to

[Prev in Thread] Current Thread [Next in Thread]