Re: [PATCH v4 17/18] KVM: arm64: selftests: Replace ARM64_SYS_REG with ARM64_SYS_KVM_REG

From: Raghavendra Rao Ananta <rananta@google.com>
To: Andrew Jones <drjones@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Peter Shier <pshier@google.com>,
	Ricardo Koller <ricarkol@google.com>,
	Oliver Upton <oupton@google.com>,
	Reiji Watanabe <reijiw@google.com>,
	Jing Zhang <jingzhangos@google.com>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Subject: Re: [PATCH v4 17/18] KVM: arm64: selftests: Replace ARM64_SYS_REG with ARM64_SYS_KVM_REG
Date: Thu, 9 Sep 2021 10:29:50 -0700	[thread overview]
Message-ID: <CAJHc60yX69ddFiSpkp-gFd8OvNM43AnPED=iAEdmOk8aYHDzDA@mail.gmail.com> (raw)
In-Reply-To: <20210909133814.wsua43ya2erfw6gm@gator>

On Thu, Sep 9, 2021 at 6:38 AM Andrew Jones <drjones@redhat.com> wrote:
>
> On Thu, Sep 09, 2021 at 01:38:17AM +0000, Raghavendra Rao Ananta wrote:
> > With the introduction of ARM64_SYS_KVM_REG, that takes the
> > system register encodings from sysreg.h directly, replace
> > all the users of ARM64_SYS_REG, relyiing on the encodings
> > created in processor.h, with ARM64_SYS_KVM_REG.
> >
> > Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
> > ---
> >  .../selftests/kvm/aarch64/debug-exceptions.c     |  2 +-
> >  .../selftests/kvm/aarch64/psci_cpu_on_test.c     |  3 ++-
> >  .../selftests/kvm/include/aarch64/processor.h    | 10 ----------
> >  .../selftests/kvm/lib/aarch64/processor.c        | 16 ++++++++--------
> >  4 files changed, 11 insertions(+), 20 deletions(-)
> >
> > diff --git a/tools/testing/selftests/kvm/aarch64/debug-exceptions.c b/tools/testing/selftests/kvm/aarch64/debug-exceptions.c
> > index 11fd23e21cb4..b28b311f4dd7 100644
> > --- a/tools/testing/selftests/kvm/aarch64/debug-exceptions.c
> > +++ b/tools/testing/selftests/kvm/aarch64/debug-exceptions.c
> > @@ -190,7 +190,7 @@ static int debug_version(struct kvm_vm *vm)
> >  {
> >       uint64_t id_aa64dfr0;
> >
> > -     get_reg(vm, VCPU_ID, ARM64_SYS_REG(ID_AA64DFR0_EL1), &id_aa64dfr0);
> > +     get_reg(vm, VCPU_ID, ARM64_SYS_KVM_REG(SYS_ID_AA64DFR0_EL1), &id_aa64dfr0);
> >       return id_aa64dfr0 & 0xf;
> >  }
> >
> > diff --git a/tools/testing/selftests/kvm/aarch64/psci_cpu_on_test.c b/tools/testing/selftests/kvm/aarch64/psci_cpu_on_test.c
> > index 018c269990e1..4c8aa7b8a65d 100644
> > --- a/tools/testing/selftests/kvm/aarch64/psci_cpu_on_test.c
> > +++ b/tools/testing/selftests/kvm/aarch64/psci_cpu_on_test.c
> > @@ -91,7 +91,8 @@ int main(void)
> >       init.features[0] |= (1 << KVM_ARM_VCPU_POWER_OFF);
> >       aarch64_vcpu_add_default(vm, VCPU_ID_TARGET, &init, guest_main);
> >
> > -     get_reg(vm, VCPU_ID_TARGET, ARM64_SYS_REG(MPIDR_EL1), &target_mpidr);
> > +     get_reg(vm, VCPU_ID_TARGET,
> > +             ARM64_SYS_KVM_REG(SYS_MPIDR_EL1), &target_mpidr);
>
> nit: I'd just leave this on one line. We don't mind long lines in this
> part of town.
>
Good to know. I'll pull it into one line.
> >       vcpu_args_set(vm, VCPU_ID_SOURCE, 1, target_mpidr & MPIDR_HWID_BITMASK);
> >       vcpu_run(vm, VCPU_ID_SOURCE);
> >
> > diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
> > index 150f63101f4c..ee81dd3db516 100644
> > --- a/tools/testing/selftests/kvm/include/aarch64/processor.h
> > +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
> > @@ -16,16 +16,6 @@
> >  #define ARM64_CORE_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \
> >                          KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(x))
> >
> > -#define CPACR_EL1               3, 0,  1, 0, 2
> > -#define TCR_EL1                 3, 0,  2, 0, 2
> > -#define MAIR_EL1                3, 0, 10, 2, 0
> > -#define MPIDR_EL1               3, 0,  0, 0, 5
> > -#define TTBR0_EL1               3, 0,  2, 0, 0
> > -#define SCTLR_EL1               3, 0,  1, 0, 0
> > -#define VBAR_EL1                3, 0, 12, 0, 0
> > -
> > -#define ID_AA64DFR0_EL1         3, 0,  0, 5, 0
> > -
> >  /*
> >   * ARM64_SYS_KVM_REG(sys_reg_id): Helper macro to convert
> >   * SYS_* register definitions in sysreg.h to use in KVM
> > diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > index 9844b62227b1..d7b89aa092f5 100644
> > --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > @@ -240,10 +240,10 @@ void aarch64_vcpu_setup(struct kvm_vm *vm, int vcpuid, struct kvm_vcpu_init *ini
> >        * Enable FP/ASIMD to avoid trapping when accessing Q0-Q15
> >        * registers, which the variable argument list macros do.
> >        */
> > -     set_reg(vm, vcpuid, ARM64_SYS_REG(CPACR_EL1), 3 << 20);
> > +     set_reg(vm, vcpuid, ARM64_SYS_KVM_REG(SYS_CPACR_EL1), 3 << 20);
> >
> > -     get_reg(vm, vcpuid, ARM64_SYS_REG(SCTLR_EL1), &sctlr_el1);
> > -     get_reg(vm, vcpuid, ARM64_SYS_REG(TCR_EL1), &tcr_el1);
> > +     get_reg(vm, vcpuid, ARM64_SYS_KVM_REG(SYS_SCTLR_EL1), &sctlr_el1);
> > +     get_reg(vm, vcpuid, ARM64_SYS_KVM_REG(SYS_TCR_EL1), &tcr_el1);
> >
> >       switch (vm->mode) {
> >       case VM_MODE_P52V48_4K:
> > @@ -281,10 +281,10 @@ void aarch64_vcpu_setup(struct kvm_vm *vm, int vcpuid, struct kvm_vcpu_init *ini
> >       tcr_el1 |= (1 << 8) | (1 << 10) | (3 << 12);
> >       tcr_el1 |= (64 - vm->va_bits) /* T0SZ */;
> >
> > -     set_reg(vm, vcpuid, ARM64_SYS_REG(SCTLR_EL1), sctlr_el1);
> > -     set_reg(vm, vcpuid, ARM64_SYS_REG(TCR_EL1), tcr_el1);
> > -     set_reg(vm, vcpuid, ARM64_SYS_REG(MAIR_EL1), DEFAULT_MAIR_EL1);
> > -     set_reg(vm, vcpuid, ARM64_SYS_REG(TTBR0_EL1), vm->pgd);
> > +     set_reg(vm, vcpuid, ARM64_SYS_KVM_REG(SYS_SCTLR_EL1), sctlr_el1);
> > +     set_reg(vm, vcpuid, ARM64_SYS_KVM_REG(SYS_TCR_EL1), tcr_el1);
> > +     set_reg(vm, vcpuid, ARM64_SYS_KVM_REG(SYS_MAIR_EL1), DEFAULT_MAIR_EL1);
> > +     set_reg(vm, vcpuid, ARM64_SYS_KVM_REG(SYS_TTBR0_EL1), vm->pgd);
> >  }
> >
> >  void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
> > @@ -370,7 +370,7 @@ void vcpu_init_descriptor_tables(struct kvm_vm *vm, uint32_t vcpuid)
> >  {
> >       extern char vectors;
> >
> > -     set_reg(vm, vcpuid, ARM64_SYS_REG(VBAR_EL1), (uint64_t)&vectors);
> > +     set_reg(vm, vcpuid, ARM64_SYS_KVM_REG(SYS_VBAR_EL1), (uint64_t)&vectors);
> >  }
> >
> >  void route_exception(struct ex_regs *regs, int vector)
> > --
> > 2.33.0.153.gba50c8fa24-goog
> >
>
> I also agree with Oliver that this patch may be squashed into the one that
> introduces ARM64_SYS_KVM_REG.
>
Sure, will do.

Regards,
Raghavendra
> Thanks,
> drew
>