linux-kernel - Re: [PATCH 1/9] KVM: arm64: Document PV-time interface

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Message-ID: <fd8b0c8d-79d1-1501-cee0-d3f6bc1c3487@arm.com>
Date:   Mon, 5 Aug 2019 14:06:06 +0100
From:   Steven Price <steven.price@....com>
To:     Zenghui Yu <yuzenghui@...wei.com>
Cc:     kvm@...r.kernel.org, linux-doc@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, Marc Zyngier <maz@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Will Deacon <will@...nel.org>, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/9] KVM: arm64: Document PV-time interface

On 05/08/2019 04:23, Zenghui Yu wrote:
> Hi Steven,
> 
> On 2019/8/2 22:50, Steven Price wrote:
>> Introduce a paravirtualization interface for KVM/arm64 based on the
>> "Arm Paravirtualized Time for Arm-Base Systems" specification DEN 0057A.
>>
>> This only adds the details about "Stolen Time" as the details of "Live
>> Physical Time" have not been fully agreed.
>>
>> User space can specify a reserved area of memory for the guest and
>> inform KVM to populate the memory with information on time that the host
>> kernel has stolen from the guest.
>>
>> A hypercall interface is provided for the guest to interrogate the
>> hypervisor's support for this interface and the location of the shared
>> memory structures.
>>
>> Signed-off-by: Steven Price <steven.price@....com>
>> ---
>>   Documentation/virtual/kvm/arm/pvtime.txt | 107 +++++++++++++++++++++++
>>   1 file changed, 107 insertions(+)
>>   create mode 100644 Documentation/virtual/kvm/arm/pvtime.txt
>                                     ^^^^^^^
> This directory has been renamed recently, see:
> 
> https://patchwork.ozlabs.org/patch/1136104/

Thanks for pointing that out - I'll move it in the next version.

Steve