linux-kernel - Re: [PATCH v2 08/16] arm/arm64: KVM: Advertise SMCCC v1.1

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Date:   Tue, 30 Jan 2018 12:28:09 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, Mark Rutland <mark.rutland@....com>,
        Peter Maydell <peter.maydell@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Jon Masters <jcm@...hat.com>,
        Robin Murphy <robin.murphy@....com>,
        Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [PATCH v2 08/16] arm/arm64: KVM: Advertise SMCCC v1.1

On 30/01/18 00:23, Russell King - ARM Linux wrote:
> On Mon, Jan 29, 2018 at 05:45:51PM +0000, Marc Zyngier wrote:
>> The new SMC Calling Convention (v1.1) allows for a reduced overhead
>> when calling into the firmware, and provides a new feature discovery
>> mechanism.
>>
>> Make it visible to KVM guests.
>>
>> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
>> ---
>>  Documentation/virtual/kvm/arm/psci.txt | 12 +++++++-----
>>  arch/arm/kvm/handle_exit.c             |  2 +-
>>  arch/arm64/kvm/handle_exit.c           |  2 +-
>>  include/kvm/arm_psci.h                 |  2 +-
>>  include/linux/arm-smccc.h              | 13 +++++++++++++
>>  virt/kvm/arm/psci.c                    | 24 +++++++++++++++++++++++-
>>  6 files changed, 46 insertions(+), 9 deletions(-)
>>
>> diff --git a/Documentation/virtual/kvm/arm/psci.txt b/Documentation/virtual/kvm/arm/psci.txt
>> index 2e49a4e9f084..aafdab887b04 100644
>> --- a/Documentation/virtual/kvm/arm/psci.txt
>> +++ b/Documentation/virtual/kvm/arm/psci.txt
>> @@ -13,7 +13,7 @@ a migration causes a different PSCI version to be exposed out of the
>>  blue to an unsuspecting guest.
>>  
>>  In order to remedy this situation, KVM exposes a set of "firmware
>> -pseuodo-registers" that can be manipulated using the GET/SET_ONE_REG
>> +pseudo-registers" that can be manipulated using the GET/SET_ONE_REG
> 
> This should surely be in patch 7?

Indeed. Thanks for the heads up.

	M.
-- 
Jazz is not dead. It just smells funny...