Re: [PATCH v4 09/18] KVM: arm64: selftests: Add guest support to get the vcpuid
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From: Reiji Watanabe <hidden>
Date: 2021-09-12 07:05:44
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Hi Raghu and all, On Wed, Sep 8, 2021 at 6:38 PM Raghavendra Rao Ananta [off-list ref] 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel