From: Raghavendra Rao Ananta <rananta@google.com>
To: Ricardo Koller <ricarkol@google.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>,
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 v3 10/12] KVM: arm64: selftests: Add host support for vGIC
Date: Thu, 2 Sep 2021 10:59:10 -0700 [thread overview]
Message-ID: <CAJHc60zR8q28kvbpB2USeVR154OzKLQuZOFSOOOsW0WrqD0OEw@mail.gmail.com> (raw)
In-Reply-To: <YTEJt2pC1cIcwvyD@google.com>
On Thu, Sep 2, 2021 at 10:28 AM Ricardo Koller <ricarkol@google.com> wrote:
>
> On Wed, Sep 01, 2021 at 09:14:10PM +0000, Raghavendra Rao Ananta wrote:
> > Implement a simple library to do perform vGIC-v3
> > setup from a host of view. This includes creating
> > a vGIC device, setting up distributor and redistributor
> > attributes, and mapping the guest physical addresses.
> >
> > Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
> >
> > ---
> > tools/testing/selftests/kvm/Makefile | 2 +-
> > .../selftests/kvm/include/aarch64/vgic.h | 14 ++++
> > .../testing/selftests/kvm/lib/aarch64/vgic.c | 67 +++++++++++++++++++
> > 3 files changed, 82 insertions(+), 1 deletion(-)
> > create mode 100644 tools/testing/selftests/kvm/include/aarch64/vgic.h
> > create mode 100644 tools/testing/selftests/kvm/lib/aarch64/vgic.c
> >
> > diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> > index 5476a8ddef60..8342f65c1d96 100644
> > --- a/tools/testing/selftests/kvm/Makefile
> > +++ b/tools/testing/selftests/kvm/Makefile
> > @@ -35,7 +35,7 @@ endif
> >
> > LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/rbtree.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c
> > LIBKVM_x86_64 = lib/x86_64/apic.c lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S
> > -LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c lib/aarch64/gic.c lib/aarch64/gic_v3.c
> > +LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c lib/aarch64/gic.c lib/aarch64/gic_v3.c lib/aarch64/vgic.c
> > LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
> >
> > TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
> > diff --git a/tools/testing/selftests/kvm/include/aarch64/vgic.h b/tools/testing/selftests/kvm/include/aarch64/vgic.h
> > new file mode 100644
> > index 000000000000..45bbf238147a
> > --- /dev/null
> > +++ b/tools/testing/selftests/kvm/include/aarch64/vgic.h
> > @@ -0,0 +1,14 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * ARM Generic Interrupt Controller (GIC) host specific defines
> > + */
> > +
> > +#ifndef SELFTEST_KVM_VGIC_H
> > +#define SELFTEST_KVM_VGIC_H
> > +
> > +#include <linux/kvm.h>
> > +
> > +int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus,
> > + uint64_t gicd_base_gpa, uint64_t gicr_base_gpa, uint32_t slot);
> > +
> > +#endif /* SELFTEST_KVM_VGIC_H */
> > diff --git a/tools/testing/selftests/kvm/lib/aarch64/vgic.c b/tools/testing/selftests/kvm/lib/aarch64/vgic.c
> > new file mode 100644
> > index 000000000000..a0e4b986d335
> > --- /dev/null
> > +++ b/tools/testing/selftests/kvm/lib/aarch64/vgic.c
> > @@ -0,0 +1,67 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * ARM Generic Interrupt Controller (GIC) v3 host support
> > + */
> > +
> > +#include <linux/kvm.h>
> > +#include <linux/sizes.h>
> > +
> > +#include "kvm_util.h"
> > +
> > +#define VGIC_V3_GICD_SZ (SZ_64K)
> > +#define VGIC_V3_GICR_SZ (2 * SZ_64K)
> > +
> > +#define REDIST_REGION_ATTR_ADDR(count, base, flags, index) \
> > + (((uint64_t)(count) << 52) | \
> > + ((uint64_t)((base) >> 16) << 16) | \
> > + ((uint64_t)(flags) << 12) | \
> > + index)
> > +
> > +static void vgic_v3_map(struct kvm_vm *vm, uint64_t addr, unsigned int size)
> > +{
> > + unsigned int n_pages = DIV_ROUND_UP(size, vm_get_page_size(vm));
> > +
> > + virt_map(vm, addr, addr, n_pages);
> > +}
> > +
> > +/*
> > + * vGIC-v3 default host setup
> > + *
> > + * Input args:
> > + * vm - KVM VM
> > + * nr_vcpus - Number of vCPUs for this VM
> > + * gicd_base_gpa - Guest Physical Address of the Distributor region
> > + * gicr_base_gpa - Guest Physical Address of the Redistributor region
> > + *
> > + * Output args: None
> > + *
> > + * Return: GIC file-descriptor or negative error code upon failure
> > + *
> > + * The function creates a vGIC-v3 device and maps the distributor and
> > + * redistributor regions of the guest.
> > + */
> > +int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus,
> > + uint64_t gicd_base_gpa, uint64_t gicr_base_gpa)
> > +{
> > + uint64_t redist_attr;
> > + int gic_fd;
> > +
> > + TEST_ASSERT(nr_vcpus <= KVM_MAX_VCPUS,
> > + "Invalid number of CPUs: %u\n", nr_vcpus);
> > +
> > + gic_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
>
> Nit: you can return early if gic_fd is bad.
>
kvm_create_device() already takes care of this and the test would
simply fail if gic_fd was bad.
So, I think we can positively move on :)
> > +
> > + kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
> > + KVM_VGIC_V3_ADDR_TYPE_DIST, &gicd_base_gpa, true);
> > + vgic_v3_map(vm, gicd_base_gpa, VGIC_V3_GICD_SZ);
>
> vgic_v3_map() implies that it's doing something vgic specific, when it's
> just converting bytes to pages. What about something like the following?
>
> virt_map(vm, addr, addr, VM_BYTES_TO_PAGES(vm, VGIC_V3_GICD_SZ));
>
> and you add a VM_BYTES_TO_PAGES macro to include/kvm_util.h? I think
> this macro can be useful to others.
>
Yeah, good idea. Will do.
Regards,
Raghavendra
> > +
> > + redist_attr = REDIST_REGION_ATTR_ADDR(nr_vcpus, gicr_base_gpa, 0, 0);
> > + kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
> > + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &redist_attr, true);
> > + vgic_v3_map(vm, gicr_base_gpa, VGIC_V3_GICR_SZ * nr_vcpus);
> > +
> > + kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
> > + KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
> > +
> > + return gic_fd;
> > +}
> > --
> > 2.33.0.153.gba50c8fa24-goog
> >
next prev parent reply other threads:[~2021-09-02 17:59 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-01 21:14 [PATCH v3 00/12] KVM: arm64: selftests: Introduce arch_timer selftest Raghavendra Rao Ananta
2021-09-01 21:14 ` [PATCH v3 01/12] KVM: arm64: selftests: Add MMIO readl/writel support Raghavendra Rao Ananta
2021-09-01 21:23 ` Oliver Upton
2021-09-01 22:43 ` Raghavendra Rao Ananta
2021-09-02 20:17 ` Oliver Upton
2021-09-02 13:21 ` Andrew Jones
2021-09-01 21:14 ` [PATCH v3 02/12] KVM: arm64: selftests: Add write_sysreg_s and read_sysreg_s Raghavendra Rao Ananta
2021-09-01 21:28 ` Oliver Upton
2021-09-01 22:08 ` Oliver Upton
2021-09-01 22:48 ` Raghavendra Rao Ananta
2021-09-01 23:06 ` Oliver Upton
2021-09-02 12:31 ` Andrew Jones
2021-09-02 17:55 ` Raghavendra Rao Ananta
2021-09-02 13:44 ` Andrew Jones
2021-09-01 21:14 ` [PATCH v3 03/12] KVM: arm64: selftests: Add support for cpu_relax Raghavendra Rao Ananta
2021-09-01 21:29 ` Oliver Upton
2021-09-01 22:10 ` Oliver Upton
2021-09-02 13:46 ` Andrew Jones
2021-09-01 21:14 ` [PATCH v3 04/12] KVM: arm64: selftests: Add basic support for arch_timers Raghavendra Rao Ananta
2021-09-02 14:12 ` Andrew Jones
2021-09-01 21:14 ` [PATCH v3 05/12] KVM: arm64: selftests: Add basic support to generate delays Raghavendra Rao Ananta
2021-09-02 14:35 ` Andrew Jones
2021-09-02 20:20 ` Oliver Upton
2021-09-01 21:14 ` [PATCH v3 06/12] KVM: arm64: selftests: Add support to disable and enable local IRQs Raghavendra Rao Ananta
2021-09-01 23:26 ` Oliver Upton
2021-09-02 14:43 ` Andrew Jones
2021-09-01 21:14 ` [PATCH v3 07/12] KVM: arm64: selftests: Add support to get the vcpuid from MPIDR_EL1 Raghavendra Rao Ananta
2021-09-01 23:48 ` Oliver Upton
2021-09-02 12:36 ` Andrew Jones
2021-09-02 17:52 ` Raghavendra Rao Ananta
2021-09-01 21:14 ` [PATCH v3 08/12] KVM: arm64: selftests: Add light-weight spinlock support Raghavendra Rao Ananta
2021-09-02 21:06 ` Oliver Upton
2021-09-03 8:25 ` Andrew Jones
2021-09-01 21:14 ` [PATCH v3 09/12] KVM: arm64: selftests: Add basic GICv3 support Raghavendra Rao Ananta
2021-09-03 9:37 ` Andrew Jones
2021-09-01 21:14 ` [PATCH v3 10/12] KVM: arm64: selftests: Add host support for vGIC Raghavendra Rao Ananta
2021-09-02 17:28 ` Ricardo Koller
2021-09-02 17:59 ` Raghavendra Rao Ananta [this message]
2021-09-03 10:00 ` Andrew Jones
2021-09-03 20:45 ` Raghavendra Rao Ananta
2021-09-03 10:51 ` Andrew Jones
2021-09-03 20:48 ` Raghavendra Rao Ananta
2021-09-01 21:14 ` [PATCH v3 11/12] KVM: arm64: selftests: Add arch_timer test Raghavendra Rao Ananta
2021-09-03 10:48 ` Andrew Jones
2021-09-03 20:42 ` Raghavendra Rao Ananta
2021-09-01 21:14 ` [PATCH v3 12/12] KVM: arm64: selftests: arch_timer: Support vCPU migration Raghavendra Rao Ananta
2021-09-03 11:05 ` Andrew Jones
2021-09-03 20:53 ` Raghavendra Rao Ananta
2021-09-06 6:39 ` Andrew Jones
2021-09-07 16:14 ` Raghavendra Rao Ananta
2021-09-07 16:20 ` Andrew Jones
2021-09-01 22:04 ` [PATCH v3 00/12] KVM: arm64: selftests: Introduce arch_timer selftest Oliver Upton
2021-09-01 22:05 ` Oliver Upton
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