linux-kernel - Re: [PATCH v2] KVM: arm64: Add missing BTI instructions

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Date:   Wed, 12 Jul 2023 22:50:34 +0000
From:   Oliver Upton <oliver.upton@...ux.dev>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvmarm@...ts.linux.dev, maz@...nel.org,
        Mostafa Saleh <smostafa@...gle.com>
Cc:     Oliver Upton <oliver.upton@...ux.dev>, suzuki.poulose@....com,
        tabba@...gle.com, james.morse@....com, qperret@...gle.com,
        bgardon@...gle.com, sudeep.holla@....com, gshan@...hat.com,
        yuzenghui@...wei.com, will@...nel.org, catalin.marinas@....com
Subject: Re: [PATCH v2] KVM: arm64: Add missing BTI instructions

On Thu, 6 Jul 2023 15:22:40 +0000, Mostafa Saleh wrote:
> Some bti instructions were missing from
> commit b53d4a272349 ("KVM: arm64: Use BTI for nvhe")
> 
> 1) kvm_host_psci_cpu_entry
> kvm_host_psci_cpu_entry is called from __kvm_hyp_init_cpu through "br"
> instruction as __kvm_hyp_init_cpu resides in idmap section while
> kvm_host_psci_cpu_entry is in hyp .text so the offset is larger than
> 128MB range covered by "b".
> Which means that this function should start with "bti j" instruction.
> 
> [...]

Applied to kvmarm/fixes. Sorry this took longer than expected, Mostafa. I
was hitting an unrelated issue with pKVM initialization on the only system
I have that supports BTI.

[1/1] KVM: arm64: Add missing BTI instructions
      https://git.kernel.org/kvmarm/kvmarm/c/dcf89d111199

--
Best,
Oliver