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From: Anshuman Khandual <anshuman.khandual@arm.com>
To: Will Deacon <will@kernel.org>, linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com, Marc Zyngier <maz@kernel.org>,
	linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH V3] arm64/cpufeature: Validate hypervisor capabilities during CPU hotplug
Date: Thu, 21 May 2020 06:18:09 +0530
Message-ID: <e2ccbfdd-85ee-f01c-ce02-462d1a76c273@arm.com> (raw)
In-Reply-To: <158998676494.231372.15074477766045633803.b4-ty@kernel.org>



On 05/20/2020 11:24 PM, Will Deacon wrote:
> On Tue, 12 May 2020 07:27:27 +0530, Anshuman Khandual wrote:
>> This validates hypervisor capabilities like VMID width, IPA range for any
>> hot plug CPU against system finalized values. KVM's view of the IPA space
>> is used while allowing a given CPU to come up. While here, it factors out
>> get_vmid_bits() for general use.
>>
>> Cc: Catalin Marinas <catalin.marinas@arm.com>
>> Cc: Will Deacon <will@kernel.org>
>> Cc: Marc Zyngier <maz@kernel.org>
>> Cc: Mark Rutland <mark.rutland@arm.com>
>> Cc: James Morse <james.morse@arm.com>
>> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
>> Cc: linux-arm-kernel@lists.infradead.org
>> Cc: kvmarm@lists.cs.columbia.edu
>> Cc: linux-kernel@vger.kernel.org
> 
> Applied to arm64 (for-next/cpufeature), thanks!
> 
> [1/1] arm64/cpufeature: Validate hypervisor capabilities during CPU hotplug
>       https://git.kernel.org/arm64/c/c73433fc630c
> 
> But please note that I made some changes to verify_hyp_capabilities() so
> that it's (a) static and (b) uses IS_ENABLED to avoid the dummy function
> definition. I also extended the IS_ENABLED_check so that it doesn't
> conflict with the KVM kconfig changes from Fuad. Please shout if you think
> I'm still missing something.

Normally I would have expected get_kvm_ipa_limit() to be unavailable without
CONFIG_KVM_ARM_HOST, causing a build failure. But it does compile correctly.
Probably the compiler does not really look for get_kvm_ipa_limit() definition
after an early check and bailout on !IS_ENABLED(CONFIG_KVM_ARM_HOST).

Nonetheless, changes looks good. Thank you.

- Anshuman
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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-12  1:57 Anshuman Khandual
2020-05-20 17:54 ` Will Deacon
2020-05-21  0:48   ` Anshuman Khandual [this message]

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