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From: Christoffer Dall <cdall@kernel.org>
To: Eric Auger <eric.auger@redhat.com>
Cc: eric.auger.pro@gmail.com, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	marc.zyngier@arm.com, peter.maydell@linaro.org,
	andre.przywara@arm.com, drjones@redhat.com, wei@redhat.com
Subject: Re: [RFC v2 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION
Date: Mon, 9 Apr 2018 23:38:52 +0200	[thread overview]
Message-ID: <20180409213852.GJ10904@cbox> (raw)
In-Reply-To: <1522159456-10419-3-git-send-email-eric.auger@redhat.com>

Hi Eric,

On Tue, Mar 27, 2018 at 04:04:06PM +0200, Eric Auger wrote:
> We introduce a new KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION attribute in
> KVM_DEV_ARM_VGIC_GRP_ADDR group. 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>
> ---
>  Documentation/virtual/kvm/devices/arm-vgic-v3.txt | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
> index 9293b45..0ded904 100644
> --- a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
> +++ b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
> @@ -27,6 +27,24 @@ 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 attr field of kvm_device_attr encodes 3 values:
> +      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. There are two 64K pages
> +        for each VCPU and all of the redistributor pages are contiguous

should this be two 64K pages for the number of redistributors in this
region as specified by count ?

> +        within the redistributor region.
> +      - count encodes the number of redistributors in the region.

I assume it's implied that the user must register a total number of
redistributors across all the regions that matches the number of vcpus,
and that otherwise something bad happens?

> +      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. When attempted an
> +  -EINVAL error is returned.
> +
>    Errors:
>      -E2BIG:  Address outside of addressable IPA range
>      -EINVAL: Incorrectly aligned address
> -- 
> 2.5.5
> 

Thanks,
-Christoffer

  reply	other threads:[~2018-04-09 21:38 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-27 14:04 [RFC v2 00/12] KVM: arm/arm64: Allow multiple GICv3 redistributor regions Eric Auger
2018-03-27 14:04 ` [RFC v2 01/12] KVM: arm/arm64: Set dist->spis to NULL after kfree Eric Auger
2018-03-27 17:10   ` Marc Zyngier
2018-03-28  6:41     ` Auger Eric
2018-03-27 14:04 ` [RFC v2 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger
2018-04-09 21:38   ` Christoffer Dall [this message]
2018-04-12 15:51     ` Auger Eric
2018-03-27 14:04 ` [RFC v2 03/12] KVM: arm/arm64: Replace the single rdist region by a list Eric Auger
2018-03-27 14:04 ` [RFC v2 04/12] KVM: arm/arm64: Helper to locate free rdist index Eric Auger
2018-03-27 14:04 ` [RFC v2 05/12] KVM: arm/arm64: Revisit Redistributor TYPER last bit computation Eric Auger
2018-03-27 14:04 ` [RFC v2 06/12] KVM: arm/arm64: Helper to register a new redistributor region Eric Auger
2018-03-27 14:04 ` [RFC v2 07/12] KVM: arm/arm64: Adapt vgic_v3_check_base to multiple rdist regions Eric Auger
2018-03-27 14:04 ` [RFC v2 08/12] KVM: arm/arm64: Check vcpu redist base before registering an iodev Eric Auger
2018-03-27 14:04 ` [RFC v2 09/12] KVM: arm/arm64: Check all vcpu redistributors are set on map_resources Eric Auger
2018-03-27 14:04 ` [RFC v2 10/12] KVM: arm/arm64: Add KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger
2018-03-27 14:04 ` [RFC v2 11/12] KVM: arm/arm64: Implement KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger
2018-03-28 18:55   ` Peter Maydell
2018-03-28 20:19     ` Auger Eric
2018-03-27 14:04 ` [RFC v2 12/12] KVM: arm/arm64: Bump VGIC_V3_MAX_CPUS to 512 Eric Auger

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