lkml.org 
[lkml]   [2021]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    SubjectRe: [PATCH v7 10/15] KVM: arm64: selftests: Add guest support to get the vcpuid
    On Tue, Sep 14, 2021 at 10:31:09PM +0000, Raghavendra Rao Ananta wrote:
    > At times, such as when in the interrupt handler, the guest wants
    > to get the vcpuid that it's running on to pull the per-cpu private
    > data. As a result, introduce guest_get_vcpuid() that returns the
    > vcpuid of the calling vcpu. The interface is architecture
    > independent, but defined only for arm64 as of now.
    >
    > Suggested-by: Reiji Watanabe <reijiw@google.com>
    > Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
    > Reviewed-by: Ricardo Koller <ricarkol@google.com>
    > Reviewed-by: Reiji Watanabe <reijiw@google.com>
    > ---
    > tools/testing/selftests/kvm/include/kvm_util.h | 2 ++
    > tools/testing/selftests/kvm/lib/aarch64/processor.c | 6 ++++++
    > 2 files changed, 8 insertions(+)
    >
    > diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
    > index 010b59b13917..bcf05f5381ed 100644
    > --- a/tools/testing/selftests/kvm/include/kvm_util.h
    > +++ b/tools/testing/selftests/kvm/include/kvm_util.h
    > @@ -400,4 +400,6 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
    > int vm_get_stats_fd(struct kvm_vm *vm);
    > int vcpu_get_stats_fd(struct kvm_vm *vm, uint32_t vcpuid);
    >
    > +uint32_t guest_get_vcpuid(void);
    > +
    > #endif /* SELFTEST_KVM_UTIL_H */
    > diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
    > index 34f6bd47661f..b4eeeafd2a70 100644
    > --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
    > +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
    > @@ -277,6 +277,7 @@ void aarch64_vcpu_setup(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_vcpu_init
    > set_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_TCR_EL1), tcr_el1);
    > set_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_MAIR_EL1), DEFAULT_MAIR_EL1);
    > set_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_TTBR0_EL1), vm->pgd);
    > + set_reg(vm, vcpuid, KVM_ARM64_SYS_REG(SYS_TPIDR_EL1), vcpuid);
    > }
    >
    > void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
    > @@ -426,3 +427,8 @@ void vm_install_exception_handler(struct kvm_vm *vm, int vector,
    > assert(vector < VECTOR_NUM);
    > handlers->exception_handlers[vector][0] = handler;
    > }
    > +
    > +uint32_t guest_get_vcpuid(void)
    > +{
    > + return read_sysreg(tpidr_el1);
    > +}
    > --
    > 2.33.0.309.g3052b89438-goog
    >

    Reviewed-by: Andrew Jones <drjones@redhat.com>

    \
     
     \ /
      Last update: 2021-09-15 07:55    [W:4.076 / U:0.316 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site