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Date: Sun, 12 Sep 2021 00:05:22 -0700 From: Reiji Watanabe <reijiw@...gle.com> To: Raghavendra Rao Ananta <rananta@...gle.com> Cc: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>, Andrew Jones <drjones@...hat.com>, James Morse <james.morse@....com>, Alexandru Elisei <alexandru.elisei@....com>, Suzuki K Poulose <suzuki.poulose@....com>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>, Ricardo Koller <ricarkol@...gle.com>, Oliver Upton <oupton@...gle.com>, Jing Zhang <jingzhangos@...gle.com>, linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org, kvm@...r.kernel.org Subject: Re: [PATCH v4 09/18] KVM: arm64: selftests: Add guest support to get the vcpuid Hi Raghu and all, On Wed, Sep 8, 2021 at 6:38 PM Raghavendra Rao Ananta <rananta@...gle.com> wrote: > > At times, such as when in the interrupt handler, the guest wants > to get the vcpuid that it's running on. As a result, introduce > get_vcpuid() that returns the vcpuid of the calling vcpu. At its > backend, the VMM prepares a map of vcpuid and mpidr during VM > initialization and exports the map to the guest for it to read. How about using TPIDR_EL1 to hold the vcpuid ? i.e. have aarch64_vcpu_setup() set the register to vcpuid and guest_get_vcpuid() simply return a value of the register. This would be a simpler solution to implement. Thanks, Reiji
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