All of lore.kernel.org
 help / color / mirror / Atom feed
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

WARNING: multiple messages have this Message-ID (diff)
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
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: 28+ 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 ` Eric Auger
2018-03-19  9:20 ` [RFC 01/12] KVM: arm/arm64: Avoid multiple dist->spis kfree Eric Auger
2018-03-19  9:20   ` 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  9:20   ` [RFC 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger
2018-03-19 14:15   ` 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  9:20   ` Eric Auger
2018-03-19 15:57   ` Marc Zyngier
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   ` 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   ` 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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1521451220-27754-3-git-send-email-eric.auger@redhat.com \
    --to=eric.auger@redhat.com \
    --cc=andre.przywara@arm.com \
    --cc=cdall@kernel.org \
    --cc=drjones@redhat.com \
    --cc=eric.auger.pro@gmail.com \
    --cc=kvm@vger.kernel.org \
    --cc=kvmarm@lists.cs.columbia.edu \
    --cc=linux-kernel@vger.kernel.org \
    --cc=marc.zyngier@arm.com \
    --cc=peter.maydell@linaro.org \
    --cc=wei@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.