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------------------- Original Message -------------------
From: Marc Zyngier
Received: Mon Jul 20 2020 10:57:01 GMT-0400 (Eastern Daylight Time)
To: Andrew Scull
Cc: kernel-team@xxxxxxxxxxx; kvmarm@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH 07/37] KVM: arm64: Separate SError detection from VAXorcism
On 2020-07-20 15:13, Andrew Scull wrote:
> On Sat, Jul 18, 2020 at 10:00:30AM +0100, Marc Zyngier wrote:
>> Hi Andrew,
>>
>> On Wed, 15 Jul 2020 19:44:08 +0100,
>> Andrew Scull <ascull@xxxxxxxxxx> wrote:
>> >
>> > When exiting a guest, just check whether there is an SError pending and
>> > set the bit in the exit code. The fixup then initiates the ceremony
>> > should it be required.
>> >
>> > The separation allows for easier choices to be made as to whether the
>> > demonic consultation should proceed.
>>
>> Such as?
>
> It's used in the next patch to keep host SErrors pending and left for
> the host to handle when reentering the host vcpu. IIUC, this matches
> the
> previous behaviour since hyp would mask SErrors.
>
> We wanted to avoid the need to convert host SErrors into virtual ones
> and I opted for this approach to keep as much of the logic/policy as
> possible in C.
Right. That's the kind of information you should put in your commit
message, as it makes your intent much clearer.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
> On Sat, Jul 18, 2020 at 10:00:30AM +0100, Marc Zyngier wrote:
>> Hi Andrew,
>>
>> On Wed, 15 Jul 2020 19:44:08 +0100,
>> Andrew Scull <ascull@xxxxxxxxxx> wrote:
>> >
>> > When exiting a guest, just check whether there is an SError pending and
>> > set the bit in the exit code. The fixup then initiates the ceremony
>> > should it be required.
>> >
>> > The separation allows for easier choices to be made as to whether the
>> > demonic consultation should proceed.
>>
>> Such as?
>
> It's used in the next patch to keep host SErrors pending and left for
> the host to handle when reentering the host vcpu. IIUC, this matches
> the
> previous behaviour since hyp would mask SErrors.
>
> We wanted to avoid the need to convert host SErrors into virtual ones
> and I opted for this approach to keep as much of the logic/policy as
> possible in C.
Right. That's the kind of information you should put in your commit
message, as it makes your intent much clearer.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
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