From: Peter Maydell <peter.maydell@linaro.org>
To: Eric Auger <eric.auger@redhat.com>
Cc: Eric Auger <eric.auger.pro@gmail.com>,
lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>,
kvm-devel <kvm@vger.kernel.org>,
kvmarm@lists.cs.columbia.edu, Marc Zyngier <marc.zyngier@arm.com>,
Christoffer Dall <cdall@kernel.org>,
Andre Przywara <andre.przywara@arm.com>,
Andrew Jones <drjones@redhat.com>, Wei Huang <wei@redhat.com>
Subject: Re: [PATCH v5 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION
Date: Mon, 30 Apr 2018 10:43:07 +0100 [thread overview]
Message-ID: <CAFEAcA9yC_UUDTt58rnMicUKjeMOcKUky3oK_Xp--a9PjZSfhw@mail.gmail.com> (raw)
In-Reply-To: <1525079264-25533-3-git-send-email-eric.auger@redhat.com>
On 30 April 2018 at 10:07, Eric Auger <eric.auger@redhat.com> wrote:
> We introduce a new KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION attribute in
> KVM_DEV_ARM_VGIC_GRP_ADDR group.
Hi; one minor grammar nit in the docs below, otherwise
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
> It allows userspace to provide the
> base address and size of a redistributor region
>
> Compared to KVM_VGIC_V3_ADDR_TYPE_REDIST, this new attribute allows
> to declare several separate redistributor regions.
>
> So the whole redist space does not need to be contiguous anymore.
>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
>
> ---
> v4 -> v5:
> - Document read access
> - removed Peter's R-b
>
> v3 -> v4:
> - Added Peter's R-b
> ---
> Documentation/virtual/kvm/devices/arm-vgic-v3.txt | 30 +++++++++++++++++++++--
> 1 file changed, 28 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
> index 9293b45..dcb7504 100644
> --- a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
> +++ b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
> @@ -27,16 +27,42 @@ Groups:
> VCPU and all of the redistributor pages are contiguous.
> Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
> This address needs to be 64K aligned.
> +
> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION (rw, 64-bit)
> + The attribute data pointed by kvm_device_attr.addr is a __u64 value:
"pointed to by"
> + bits: | 63 .... 52 | 51 .... 16 | 15 - 12 |11 - 0
> + values: | count | base | flags | index
> + - index encodes the unique redistributor region index
> + - flags: reserved for future use, currently 0
> + - base field encodes bits [51:16] of the guest physical base address
> + of the first redistributor in the region.
> + - count encodes the number of redistributors in the region. Must be
> + greater than 0.
> + There are two 64K pages for each redistributor in the region and
> + redistributors are laid out contiguously within the region. Regions
> + are filled with redistributors in the index order. The sum of all
> + region count fields must be greater than or equal to the number of
> + VCPUs. Redistributor regions must be registered in the incremental
> + index order, starting from index 0.
> + The characteristics of a specific redistributor region can be read
> + by presetting the index field in the attr data.
> + Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
> +
> + It is invalid to mix calls with KVM_VGIC_V3_ADDR_TYPE_REDIST and
> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION attributes.
> +
> Errors:
> -E2BIG: Address outside of addressable IPA range
> - -EINVAL: Incorrectly aligned address
> + -EINVAL: Incorrectly aligned address, bad redistributor region
> + count/index, mixed redistributor region attribute usage
> -EEXIST: Address already configured
> + -ENOENT: Attempt to read the characteristics of a non existing
> + redistributor region
> -ENXIO: The group or attribute is unknown/unsupported for this device
> or hardware support is missing.
> -EFAULT: Invalid user pointer for attr->addr.
>
>
> -
> KVM_DEV_ARM_VGIC_GRP_DIST_REGS
> KVM_DEV_ARM_VGIC_GRP_REDIST_REGS
> Attributes:
> --
> 2.5.5
thanks
-- PMM
next prev parent reply other threads:[~2018-04-30 9:43 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-30 9:07 [PATCH v5 00/12] KVM: arm/arm64: Allow multiple GICv3 redistributor regions Eric Auger
2018-04-30 9:07 ` [PATCH v5 01/12] KVM: arm/arm64: Set dist->spis to NULL after kfree Eric Auger
2018-04-30 9:07 ` [PATCH v5 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger
2018-04-30 9:31 ` Christoffer Dall
2018-04-30 9:43 ` Peter Maydell [this message]
2018-04-30 9:07 ` [PATCH v5 03/12] KVM: arm/arm64: Replace the single rdist region by a list Eric Auger
2018-04-30 9:07 ` [PATCH v5 04/12] KVM: arm/arm64: Helper to locate free rdist index Eric Auger
2018-04-30 9:07 ` [PATCH v5 05/12] KVM: arm/arm64: Revisit Redistributor TYPER last bit computation Eric Auger
2018-04-30 9:07 ` [PATCH v5 06/12] KVM: arm/arm64: Adapt vgic_v3_check_base to multiple rdist regions Eric Auger
2018-04-30 9:07 ` [PATCH v5 07/12] KVM: arm/arm64: Helper to register a new redistributor region Eric Auger
2018-04-30 9:42 ` Christoffer Dall
2018-04-30 9:07 ` [PATCH v5 08/12] KVM: arm/arm64: Check vcpu redist base before registering an iodev Eric Auger
2018-04-30 9:07 ` [PATCH v5 09/12] KVM: arm/arm64: Check all vcpu redistributors are set on map_resources Eric Auger
2018-04-30 9:07 ` [PATCH v5 10/12] KVM: arm/arm64: Add KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger
2018-04-30 9:07 ` [PATCH v5 11/12] KVM: arm/arm64: Implement KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger
2018-04-30 9:44 ` Christoffer Dall
2018-04-30 9:07 ` [PATCH v5 12/12] KVM: arm/arm64: Bump VGIC_V3_MAX_CPUS to 512 Eric Auger
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