From: Peter Maydell <peter.maydell@linaro.org>
To: Eric Auger <eric.auger@redhat.com>
Cc: eric.auger.pro@gmail.com, Marc Zyngier <marc.zyngier@arm.com>,
Christoffer Dall <christoffer.dall@linaro.org>,
Vijaya Kumar K <vijayak@caviumnetworks.com>,
"Kumar, Vijaya" <Vijaya.Kumar@cavium.com>,
arm-mail-list <linux-arm-kernel@lists.infradead.org>,
Andrew Jones <drjones@redhat.com>,
"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
kvm-devel <kvm@vger.kernel.org>,
Andre Przywara <andre.przywara@arm.com>,
"prasun.kapoor" <Prasun.Kapoor@cavium.com>,
Paolo Bonzini <pbonzini@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>
Subject: Re: [RFC 01/13] KVM: arm/arm64: Add vITS save/restore API documentation
Date: Fri, 3 Feb 2017 14:00:13 +0000 [thread overview]
Message-ID: <CAFEAcA98mFM=iNs2n=F9d4suV7+mjPJRjZfiYagX5y7HiPgMnw@mail.gmail.com> (raw)
In-Reply-To: <1484236613-24633-2-git-send-email-eric.auger@redhat.com>
On 12 January 2017 at 15:56, Eric Auger <eric.auger@redhat.com> wrote:
> Add description for how to access vITS registers and how to flush/restore
> vITS tables into/from memory
>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> ---
> Documentation/virtual/kvm/devices/arm-vgic-its.txt | 70 ++++++++++++++++++++++
> 1 file changed, 70 insertions(+)
>
> diff --git a/Documentation/virtual/kvm/devices/arm-vgic-its.txt b/Documentation/virtual/kvm/devices/arm-vgic-its.txt
> index 6081a5b..bd74613 100644
> --- a/Documentation/virtual/kvm/devices/arm-vgic-its.txt
> +++ b/Documentation/virtual/kvm/devices/arm-vgic-its.txt
> @@ -36,3 +36,73 @@ Groups:
> -ENXIO: ITS not properly configured as required prior to setting
> this attribute
> -ENOMEM: Memory shortage when allocating ITS internal data
> +
> + KVM_DEV_ARM_VGIC_GRP_ITS_REGS
> + Attributes:
> + The attr field of kvm_device_attr encodes the offset of the
> + ITS register, relative to the ITS control frame base address
> + (ITS_base).
> +
> + kvm_device_attr.addr points to a __u64 value whatever the width
> + of the addressed register (32/64 bits).
> +
> + Writes to read-only registers are ignored by the kernel except
> + for a single register, GITS_READR. Normally this register is RO
> + but it needs to be restored otherwise commands in the queue will
> + be re-executed after CWRITER setting.
Dumb question -- is it possible/sensible to process the command
queue rather than migrating a list of outstanding commands?
thanks
-- PMM
WARNING: multiple messages have this Message-ID (diff)
From: peter.maydell@linaro.org (Peter Maydell)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC 01/13] KVM: arm/arm64: Add vITS save/restore API documentation
Date: Fri, 3 Feb 2017 14:00:13 +0000 [thread overview]
Message-ID: <CAFEAcA98mFM=iNs2n=F9d4suV7+mjPJRjZfiYagX5y7HiPgMnw@mail.gmail.com> (raw)
In-Reply-To: <1484236613-24633-2-git-send-email-eric.auger@redhat.com>
On 12 January 2017 at 15:56, Eric Auger <eric.auger@redhat.com> wrote:
> Add description for how to access vITS registers and how to flush/restore
> vITS tables into/from memory
>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> ---
> Documentation/virtual/kvm/devices/arm-vgic-its.txt | 70 ++++++++++++++++++++++
> 1 file changed, 70 insertions(+)
>
> diff --git a/Documentation/virtual/kvm/devices/arm-vgic-its.txt b/Documentation/virtual/kvm/devices/arm-vgic-its.txt
> index 6081a5b..bd74613 100644
> --- a/Documentation/virtual/kvm/devices/arm-vgic-its.txt
> +++ b/Documentation/virtual/kvm/devices/arm-vgic-its.txt
> @@ -36,3 +36,73 @@ Groups:
> -ENXIO: ITS not properly configured as required prior to setting
> this attribute
> -ENOMEM: Memory shortage when allocating ITS internal data
> +
> + KVM_DEV_ARM_VGIC_GRP_ITS_REGS
> + Attributes:
> + The attr field of kvm_device_attr encodes the offset of the
> + ITS register, relative to the ITS control frame base address
> + (ITS_base).
> +
> + kvm_device_attr.addr points to a __u64 value whatever the width
> + of the addressed register (32/64 bits).
> +
> + Writes to read-only registers are ignored by the kernel except
> + for a single register, GITS_READR. Normally this register is RO
> + but it needs to be restored otherwise commands in the queue will
> + be re-executed after CWRITER setting.
Dumb question -- is it possible/sensible to process the command
queue rather than migrating a list of outstanding commands?
thanks
-- PMM
next prev parent reply other threads:[~2017-02-03 14:00 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-12 15:56 [RFC 00/13] vITS save/restore Eric Auger
2017-01-12 15:56 ` Eric Auger
2017-01-12 15:56 ` [RFC 01/13] KVM: arm/arm64: Add vITS save/restore API documentation Eric Auger
2017-01-12 16:52 ` Marc Zyngier
2017-01-12 16:52 ` Marc Zyngier
2017-01-13 9:07 ` Auger Eric
2017-01-13 9:07 ` Auger Eric
2017-01-13 9:46 ` Marc Zyngier
2017-01-13 9:46 ` Marc Zyngier
2017-01-30 16:15 ` Auger Eric
2017-01-30 16:15 ` Auger Eric
2017-02-03 14:00 ` Peter Maydell [this message]
2017-02-03 14:00 ` Peter Maydell
2017-02-03 14:51 ` Marc Zyngier
2017-02-03 14:51 ` Marc Zyngier
2017-01-12 15:56 ` [RFC 02/13] arm/arm64: vgic: turn vgic_find_mmio_region into public Eric Auger
2017-01-12 15:56 ` [RFC 03/13] KVM: arm64: ITS: KVM_DEV_ARM_VGIC_GRP_ITS_REGS group Eric Auger
2017-01-12 15:56 ` [RFC 04/13] KVM: arm64: ITS: Implement vgic_its_has_attr_regs and attr_regs_access Eric Auger
2017-01-12 15:56 ` [RFC 05/13] KVM: arm64: ITS: Implement vgic_mmio_uaccess_write_its_creadr Eric Auger
2017-01-12 15:56 ` [RFC 06/13] KVM: arm64: ITS: Expose ITT_Entry_Size in GITS_TYPER Eric Auger
2017-01-12 17:06 ` Andre Przywara
2017-01-12 17:06 ` Andre Przywara
2017-01-13 8:31 ` Auger Eric
2017-01-13 8:31 ` Auger Eric
2017-01-12 15:56 ` [RFC 07/13] KVM: arm64: ITS: Change entry_size and indirect bit in BASER Eric Auger
2017-01-12 17:05 ` Marc Zyngier
2017-01-12 17:05 ` Marc Zyngier
2017-01-13 8:57 ` Auger Eric
2017-01-13 8:57 ` Auger Eric
2017-01-13 9:22 ` Marc Zyngier
2017-01-13 9:22 ` Marc Zyngier
2017-01-12 15:56 ` [RFC 08/13] KVM: arm64: ITS: On MAPD interpret and store itt_addr and size Eric Auger
2017-01-12 15:56 ` [RFC 09/13] KVM: arm64: ITS: KVM_DEV_ARM_VGIC_GRP_ITS_TABLES group Eric Auger
2017-01-12 15:56 ` [RFC 10/13] KVM: arm64: ITS: vgic_its_alloc_itte/device Eric Auger
2017-01-12 15:56 ` [RFC 11/13] KVM: arm64: ITS: Collection table save/restore Eric Auger
2017-01-12 15:56 ` [RFC 12/13] KVM: arm64: ITS: Device and translation table flush Eric Auger
2017-01-12 15:56 ` [RFC 13/13] KVM: arm64: ITS: Pending table save/restore Eric Auger
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