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From: Eric Auger <eric.auger@redhat.com>
To: eric.auger.pro@gmail.com, eric.auger@redhat.com,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	kvmarm@lists.cs.columbia.edu, marc.zyngier@arm.com,
	cdall@kernel.org, peter.maydell@linaro.org
Cc: andre.przywara@arm.com, drjones@redhat.com, wei@redhat.com
Subject: [RFC 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION
Date: Mon, 19 Mar 2018 10:20:10 +0100	[thread overview]
Message-ID: <1521451220-27754-3-git-send-email-eric.auger@redhat.com> (raw)
In-Reply-To: <1521451220-27754-1-git-send-email-eric.auger@redhat.com>

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 | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
index 9293b45..2c0bedf 100644
--- a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
+++ b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
@@ -27,6 +27,18 @@ 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   ....   12 |11 - 0
+      values:   |     pfns       |       base      | index
+      - index encodes the unique redistibutor region index
+      - base field encodes bits [51:12] 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
+        within the redistributor region.
+      - pfns encodes the size of the region in 64kB pages.
+      Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
   Errors:
     -E2BIG:  Address outside of addressable IPA range
     -EINVAL: Incorrectly aligned address
-- 
2.5.5

  parent reply	other threads:[~2018-03-19  9:24 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-19  9:20 [RFC 00/12] KVM: arm/arm64: Allow multiple GICv3 redistributor regions Eric Auger
2018-03-19  9:20 ` [RFC 01/12] KVM: arm/arm64: Avoid multiple dist->spis kfree Eric Auger
2018-03-19 13:46   ` Marc Zyngier
2018-03-19 20:51     ` Auger Eric
2018-03-19  9:20 ` Eric Auger [this message]
2018-03-19 14:15   ` [RFC 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Marc Zyngier
2018-03-19 20:56     ` Auger Eric
2018-03-23 14:01   ` Peter Maydell
2018-03-19  9:20 ` [RFC 03/12] KVM: arm/arm64: Record RDIST Last bit at registration Eric Auger
2018-03-19 15:57   ` Marc Zyngier
2018-03-19 21:06     ` Auger Eric
2018-03-21 11:35       ` Marc Zyngier
2018-03-19  9:20 ` [RFC 04/12] KVM: arm/arm64: Replace the single rdist region by a list Eric Auger
2018-03-19  9:20 ` [RFC 05/12] KVM: arm/arm64: Helper to locate free rdist space Eric Auger
2018-03-19  9:20 ` [RFC 06/12] KVM: arm/arm64: Helper to detect whether an RDIST is the last one Eric Auger
2018-03-19  9:20 ` [RFC 07/12] KVM: arm/arm64: Helper to register a new redistributor region Eric Auger
2018-03-19  9:20 ` [RFC 08/12] KVM: arm/arm64: Adapt vgic_v3_check_base to multiple rdist regions Eric Auger
2018-03-19  9:20 ` [RFC 09/12] KVM: arm/arm64: Check vcpu redist base before registering an iodev Eric Auger
2018-03-19  9:20 ` [RFC 10/12] KVM: arm/arm64: Check all vcpu redistributors are set on map_resources Eric Auger
2018-03-19  9:20 ` [RFC 11/12] KVM: arm/arm64: Add KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger
2018-03-19  9:20 ` [RFC 12/12] KVM: arm/arm64: Implement KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger

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