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Re: [Qemu-devel] [PATCH v5 22/24] target/arm: Implement ARMv8.5-RNG

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v5 22/24] target/arm: Implement ARMv8.5-RNG
Date: Fri, 10 May 2019 09:21:52 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 5/10/19 9:20 AM, Peter Maydell wrote:
> On Fri, 10 May 2019 at 17:17, Richard Henderson
> <address@hidden> wrote:
>> On 5/10/19 9:01 AM, Peter Maydell wrote:
>>> Don't these need to be marked ARM_CP_IO for the benefit
>>> of -icount ?
>> I don't think so.  There's no lock taken, as for mmio devices.  It's not not
>> related to time, virtual or otherwise.  There are no possible exceptions.  I
>> can't think of anything that would make icount care.
>> Have I missed something?
> If icount decides it needs to replay execution of the TB
> which the RNDR access is in, won't it get a different
> number back the second time it executes ?

Yes, it will.  I forgot about replay.


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