linux-kernel - Re: [PATCH v5 2/2] arm64: KVM: export the capability to set guest SError syndrome

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Date:   Mon, 2 Jul 2018 12:18:02 +0800
From:   gengdongjiu <gengdongjiu@...wei.com>
To:     James Morse <james.morse@....com>
CC:     <rkrcmar@...hat.com>, <corbet@....net>, <christoffer.dall@....com>,
        <marc.zyngier@....com>, <linux@...linux.org.uk>,
        <catalin.marinas@....com>, <will.deacon@....com>,
        <kvm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v5 2/2] arm64: KVM: export the capability to set guest
 SError syndrome

Hi James,

On 2018/6/29 23:58, James Morse wrote:
> Hi Dongjiu Geng,
> 
> This patch doesn't apply on v4.18-rc2.
> 
> Documentation/virtual/kvm/api.txt already has a 8.18 section. I guess you based
> this on v4.17.

Yes, indeed I based on v4.17.

> 
> For posting patches, please use the latest 'rc' from Linus' tree, (or the
> maintainer's tree listed in MAINTAINERS for the tree you are targeting if the
> maintainer has started to pick up patches).
Ok, I will rebase it using the latest 'rc' from Linus' tree. thanks for the reminder.


> 
> 
> Thanks,
> 
> James
> 
> 
> On 25/06/18 21:58, Dongjiu Geng wrote:
>> For the arm64 RAS Extension, user space can inject a virtual-SError
>> with specified ESR. So user space needs to know whether KVM support
>> to inject such SError, this interface adds this query for this capability.
>>
>> KVM will check whether system support RAS Extension, if supported, KVM
>> returns true to user space, otherwise returns false.
> 
> 
>> diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
>> index 3732097..86b3808 100644
>> --- a/Documentation/virtual/kvm/api.txt
>> +++ b/Documentation/virtual/kvm/api.txt
>> @@ -4628,3 +4628,14 @@ Architectures: s390
>>  This capability indicates that kvm will implement the interfaces to handle
>>  reset, migration and nested KVM for branch prediction blocking. The stfle
>>  facility 82 should not be provided to the guest without this capability.
>> +
>> +8.14 KVM_CAP_ARM_SET_SERROR_ESR
>> +
>> +Architectures: arm, arm64
>> +
>> +This capability indicates that userspace can specify the syndrome value reported
>> +to the guest OS when guest takes a virtual SError interrupt exception.
>> +If KVM has this capability, userspace can only specify the ISS field for the ESR
>> +syndrome, it can not specify the EC field which is not under control by KVM.
>> +If this virtual SError is taken to EL1 using AArch64, this value will be reported
>> +in ISS filed of ESR_EL1.
> 
> 
> 
> 
> .
>