linux-kernel - Re: [PATCH V2] KVM: arm64: Restrict IPA size to maximum 48 bits on 4K and 16K page size

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <162869415426.2969316.15859233360100994637.b4-ty@kernel.org>
Date:   Wed, 11 Aug 2021 16:02:44 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org,
        Anshuman Khandual <anshuman.khandual@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        James Morse <james.morse@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH V2] KVM: arm64: Restrict IPA size to maximum 48 bits on 4K and 16K page size

On Wed, 11 Aug 2021 16:41:15 +0530, Anshuman Khandual wrote:
> Even though ID_AA64MMFR0.PARANGE reports 52 bit PA size support, it cannot
> be enabled as guest IPA size on 4K or 16K page size configurations. Hence
> kvm_ipa_limit must be restricted to 48 bits. This change achieves required
> IPA capping.
> 
> Before the commit c9b69a0cf0b4 ("KVM: arm64: Don't constrain maximum IPA
> size based on host configuration"), the problem here would have been just
> latent via PHYS_MASK_SHIFT (which earlier in turn capped kvm_ipa_limit),
> which remains capped at 48 bits on 4K and 16K configs.

Applied to next, thanks!

[1/1] KVM: arm64: Restrict IPA size to maximum 48 bits on 4K and 16K page size
      commit: 5e5df9571c319fb107d7a523cc96fcc99961ee70

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.