From: Marc Zyngier <marc.zyngier@arm.com>
To: Suzuki K Poulose <suzuki.poulose@arm.com>,
linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
kvmarm@lists.cs.columbia.edu, james.morse@arm.com,
cdall@kernel.org, eric.auger@redhat.com, julien.grall@arm.com,
will.deacon@arm.com, catalin.marinas@arm.com,
punit.agrawal@arm.com, qemu-devel@nongnu.org,
"Peter Maydel" <peter.maydell@linaro.org>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>
Subject: Re: [PATCH v3 15/20] kvm: arm/arm64: Allow tuning the physical address size for VM
Date: Mon, 2 Jul 2018 14:13:59 +0100 [thread overview]
Message-ID: <f7715da8-73ea-28fb-9883-8d0c048e0792@arm.com> (raw)
In-Reply-To: <1530270944-11351-16-git-send-email-suzuki.poulose@arm.com>
On 29/06/18 12:15, Suzuki K Poulose wrote:
> Allow specifying the physical address size for a new VM via
> the kvm_type argument for KVM_CREATE_VM ioctl. This allows
> us to finalise the stage2 page table format as early as possible
> and hence perform the right checks on the memory slots without
> complication. The size is encoded as Log2(PA_Size) in the bits[7:0]
> of the type field and can encode more information in the future if
> required. The IPA size is still capped at 40bits.
Can't we relax this? There is no technical reason (AFAICS) not to allow
going down to 36bit IPA if the user has requested it.
If we run on a 36bit IPA system, the default would fail. But if the user
specified "please give me a 36bit IPA VM", we could satisfy that
requirement and allow them to run their stupidly small guest!
Thanks,
M.
--
Jazz is not dead. It just smells funny...
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <marc.zyngier@arm.com>
To: Suzuki K Poulose <suzuki.poulose@arm.com>,
linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
kvmarm@lists.cs.columbia.edu, james.morse@arm.com,
cdall@kernel.org, eric.auger@redhat.com, julien.grall@arm.com,
will.deacon@arm.com, catalin.marinas@arm.com,
punit.agrawal@arm.com, qemu-devel@nongnu.org,
"Peter Maydel" <peter.maydell@linaro.org>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v3 15/20] kvm: arm/arm64: Allow tuning the physical address size for VM
Date: Mon, 2 Jul 2018 14:13:59 +0100 [thread overview]
Message-ID: <f7715da8-73ea-28fb-9883-8d0c048e0792@arm.com> (raw)
In-Reply-To: <1530270944-11351-16-git-send-email-suzuki.poulose@arm.com>
On 29/06/18 12:15, Suzuki K Poulose wrote:
> Allow specifying the physical address size for a new VM via
> the kvm_type argument for KVM_CREATE_VM ioctl. This allows
> us to finalise the stage2 page table format as early as possible
> and hence perform the right checks on the memory slots without
> complication. The size is encoded as Log2(PA_Size) in the bits[7:0]
> of the type field and can encode more information in the future if
> required. The IPA size is still capped at 40bits.
Can't we relax this? There is no technical reason (AFAICS) not to allow
going down to 36bit IPA if the user has requested it.
If we run on a 36bit IPA system, the default would fail. But if the user
specified "please give me a 36bit IPA VM", we could satisfy that
requirement and allow them to run their stupidly small guest!
Thanks,
M.
--
Jazz is not dead. It just smells funny...
WARNING: multiple messages have this Message-ID (diff)
From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 15/20] kvm: arm/arm64: Allow tuning the physical address size for VM
Date: Mon, 2 Jul 2018 14:13:59 +0100 [thread overview]
Message-ID: <f7715da8-73ea-28fb-9883-8d0c048e0792@arm.com> (raw)
In-Reply-To: <1530270944-11351-16-git-send-email-suzuki.poulose@arm.com>
On 29/06/18 12:15, Suzuki K Poulose wrote:
> Allow specifying the physical address size for a new VM via
> the kvm_type argument for KVM_CREATE_VM ioctl. This allows
> us to finalise the stage2 page table format as early as possible
> and hence perform the right checks on the memory slots without
> complication. The size is encoded as Log2(PA_Size) in the bits[7:0]
> of the type field and can encode more information in the future if
> required. The IPA size is still capped at 40bits.
Can't we relax this? There is no technical reason (AFAICS) not to allow
going down to 36bit IPA if the user has requested it.
If we run on a 36bit IPA system, the default would fail. But if the user
specified "please give me a 36bit IPA VM", we could satisfy that
requirement and allow them to run their stupidly small guest!
Thanks,
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2018-07-02 13:14 UTC|newest]
Thread overview: 276+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-29 11:15 [PATCH v3 00/20] arm64: Dynamic & 52bit IPA support Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` [PATCH v3 01/20] virtio: mmio-v1: Validate queue PFN Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 17:42 ` Michael S. Tsirkin
2018-06-29 17:42 ` Michael S. Tsirkin
2018-06-29 17:42 ` [Qemu-devel] " Michael S. Tsirkin
2018-07-03 8:04 ` Suzuki K Poulose
2018-07-03 8:04 ` Suzuki K Poulose
2018-07-03 8:04 ` [Qemu-devel] " Suzuki K Poulose
2018-07-04 5:37 ` Michael S. Tsirkin
2018-07-04 5:37 ` Michael S. Tsirkin
2018-07-04 5:37 ` [Qemu-devel] " Michael S. Tsirkin
2018-06-29 11:15 ` [PATCH v3 02/20] virtio: pci-legacy: Validate queue pfn Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 17:42 ` Michael S. Tsirkin
2018-06-29 17:42 ` Michael S. Tsirkin
2018-06-29 17:42 ` [Qemu-devel] " Michael S. Tsirkin
2018-06-29 11:15 ` [PATCH v3 03/20] arm64: Add a helper for PARange to physical shift conversion Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 14:50 ` Auger Eric
2018-06-29 14:50 ` Auger Eric
2018-06-29 14:50 ` [Qemu-devel] " Auger Eric
2018-06-29 11:15 ` [PATCH v3 04/20] kvm: arm64: Clean up VTCR_EL2 initialisation Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 14:50 ` Auger Eric
2018-06-29 14:50 ` Auger Eric
2018-06-29 14:50 ` [Qemu-devel] " Auger Eric
2018-06-29 11:15 ` [PATCH v3 05/20] kvm: arm/arm64: Fix stage2_flush_memslot for 4 level page table Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 14:50 ` Auger Eric
2018-06-29 14:50 ` Auger Eric
2018-06-29 14:50 ` [Qemu-devel] " Auger Eric
2018-07-02 9:59 ` Marc Zyngier
2018-07-02 9:59 ` Marc Zyngier
2018-07-02 9:59 ` [Qemu-devel] " Marc Zyngier
2018-06-29 11:15 ` [PATCH v3 06/20] kvm: arm/arm64: Remove spurious WARN_ON Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 14:51 ` Auger Eric
2018-06-29 14:51 ` Auger Eric
2018-06-29 14:51 ` [Qemu-devel] " Auger Eric
2018-07-02 10:01 ` Marc Zyngier
2018-07-02 10:01 ` Marc Zyngier
2018-07-02 10:01 ` [Qemu-devel] " Marc Zyngier
2018-06-29 11:15 ` [PATCH v3 07/20] kvm: arm/arm64: Prepare for VM specific stage2 translations Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-07-02 10:12 ` Marc Zyngier
2018-07-02 10:12 ` Marc Zyngier
2018-07-02 10:12 ` [Qemu-devel] " Marc Zyngier
2018-07-02 10:12 ` Marc Zyngier
2018-07-02 10:25 ` Suzuki K Poulose
2018-07-02 10:25 ` Suzuki K Poulose
2018-07-02 10:25 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 10:51 ` Auger Eric
2018-07-02 10:51 ` Auger Eric
2018-07-02 10:51 ` [Qemu-devel] " Auger Eric
2018-07-02 10:59 ` Suzuki K Poulose
2018-07-02 10:59 ` Suzuki K Poulose
2018-07-02 10:59 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` [PATCH v3 08/20] kvm: arm/arm64: Abstract stage2 pgd table allocation Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 15:01 ` Auger Eric
2018-07-02 15:01 ` Auger Eric
2018-07-02 15:01 ` [Qemu-devel] " Auger Eric
2018-06-29 11:15 ` [PATCH v3 09/20] kvm: arm64: Make stage2 page table layout dynamic Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-07-02 10:57 ` Suzuki K Poulose
2018-07-02 10:57 ` Suzuki K Poulose
2018-07-02 10:57 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 12:14 ` Auger Eric
2018-07-02 12:14 ` Auger Eric
2018-07-02 12:14 ` [Qemu-devel] " Auger Eric
2018-07-02 13:24 ` Suzuki K Poulose
2018-07-02 13:24 ` Suzuki K Poulose
2018-07-02 13:24 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 14:46 ` Auger Eric
2018-07-02 14:46 ` Auger Eric
2018-06-29 11:15 ` [PATCH v3 10/20] kvm: arm64: Dynamic configuration of VTTBR mask Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 14:41 ` Auger Eric
2018-07-02 14:41 ` Auger Eric
2018-07-02 14:41 ` [Qemu-devel] " Auger Eric
2018-07-03 11:54 ` Suzuki K Poulose
2018-07-03 11:54 ` Suzuki K Poulose
2018-07-03 11:54 ` [Qemu-devel] " Suzuki K Poulose
2018-07-04 8:24 ` Auger Eric
2018-07-04 8:24 ` Auger Eric
2018-07-04 8:24 ` [Qemu-devel] " Auger Eric
2018-07-04 8:29 ` Suzuki K Poulose
2018-07-04 8:29 ` Suzuki K Poulose
2018-07-04 8:29 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` [PATCH v3 11/20] kvm: arm64: Helper for computing VTCR_EL2.SL0 Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 14:59 ` Auger Eric
2018-07-02 14:59 ` Auger Eric
2018-07-02 14:59 ` [Qemu-devel] " Auger Eric
2018-06-29 11:15 ` [PATCH v3 12/20] kvm: arm64: Add helper for loading the stage2 setting for a VM Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 19:13 ` Auger Eric
2018-07-02 19:13 ` Auger Eric
2018-07-02 19:13 ` [Qemu-devel] " Auger Eric
2018-06-29 11:15 ` [PATCH v3 13/20] kvm: arm64: Configure VTCR per VM Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 12:16 ` Marc Zyngier
2018-07-02 12:16 ` Marc Zyngier
2018-07-02 12:16 ` [Qemu-devel] " Marc Zyngier
2018-07-03 10:48 ` Suzuki K Poulose
2018-07-03 10:48 ` Suzuki K Poulose
2018-07-03 10:48 ` [Qemu-devel] " Suzuki K Poulose
2018-07-03 10:58 ` Marc Zyngier
2018-07-03 10:58 ` Marc Zyngier
2018-07-03 10:58 ` [Qemu-devel] " Marc Zyngier
2018-06-29 11:15 ` [PATCH v3 14/20] kvm: arm/arm64: Expose supported physical address limit for VM Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` [PATCH v3 15/20] kvm: arm/arm64: Allow tuning the physical address size " Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 13:13 ` Marc Zyngier [this message]
2018-07-02 13:13 ` Marc Zyngier
2018-07-02 13:13 ` [Qemu-devel] " Marc Zyngier
2018-07-02 13:31 ` Suzuki K Poulose
2018-07-02 13:31 ` Suzuki K Poulose
2018-07-02 13:31 ` [Qemu-devel] " Suzuki K Poulose
2018-07-04 15:51 ` Will Deacon
2018-07-04 15:51 ` Will Deacon
2018-07-04 15:51 ` [Qemu-devel] " Will Deacon
2018-07-04 22:03 ` Suzuki K Poulose
2018-07-04 22:03 ` Suzuki K Poulose
2018-07-04 22:03 ` [Qemu-devel] " Suzuki K Poulose
2018-07-04 22:03 ` Suzuki K Poulose
2018-07-06 13:49 ` Suzuki K Poulose
2018-07-06 13:49 ` Suzuki K Poulose
2018-07-06 13:49 ` [Qemu-devel] " Suzuki K Poulose
2018-07-06 13:49 ` Suzuki K Poulose
2018-07-06 15:09 ` Marc Zyngier
2018-07-06 15:09 ` Marc Zyngier
2018-07-06 15:09 ` [Qemu-devel] " Marc Zyngier
2018-07-06 15:09 ` Marc Zyngier
2018-07-06 16:39 ` Suzuki K Poulose
2018-07-06 16:39 ` Suzuki K Poulose
2018-07-06 16:39 ` [Qemu-devel] " Suzuki K Poulose
2018-07-06 16:39 ` Suzuki K Poulose
2018-07-09 11:23 ` Dave Martin
2018-07-09 11:23 ` Dave Martin
2018-07-09 11:23 ` [Qemu-devel] " Dave Martin
2018-07-09 12:29 ` Marc Zyngier
2018-07-09 12:29 ` Marc Zyngier
2018-07-09 12:29 ` [Qemu-devel] " Marc Zyngier
2018-07-09 13:37 ` Dave Martin
2018-07-09 13:37 ` Dave Martin
2018-07-09 13:37 ` [Qemu-devel] " Dave Martin
2018-07-10 16:38 ` Suzuki K Poulose
2018-07-10 16:38 ` Suzuki K Poulose
2018-07-10 16:38 ` [Qemu-devel] " Suzuki K Poulose
2018-07-10 16:38 ` Suzuki K Poulose
2018-07-10 17:03 ` Dave Martin
2018-07-10 17:03 ` Dave Martin
2018-07-10 17:03 ` [Qemu-devel] " Dave Martin
2018-07-10 17:03 ` Dave Martin
2018-07-11 9:05 ` Suzuki K Poulose
2018-07-11 9:05 ` Suzuki K Poulose
2018-07-11 9:05 ` [Qemu-devel] " Suzuki K Poulose
2018-07-11 10:38 ` Dave Martin
2018-07-11 10:38 ` Dave Martin
2018-07-11 10:38 ` [Qemu-devel] " Dave Martin
2018-06-29 11:15 ` [PATCH v3 16/20] kvm: arm64: Switch to per VM IPA limit Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 13:32 ` Marc Zyngier
2018-07-02 13:32 ` Marc Zyngier
2018-07-02 13:32 ` [Qemu-devel] " Marc Zyngier
2018-07-02 13:53 ` Suzuki K Poulose
2018-07-02 13:53 ` Suzuki K Poulose
2018-07-02 13:53 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` [PATCH v3 17/20] vgic: Add support for 52bit guest physical address Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-04 8:09 ` Auger Eric
2018-07-04 8:09 ` Auger Eric
2018-07-04 8:09 ` [Qemu-devel] " Auger Eric
2018-06-29 11:15 ` [PATCH v3 18/20] kvm: arm64: Add support for handling 52bit IPA Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 13:43 ` Marc Zyngier
2018-07-02 13:43 ` Marc Zyngier
2018-07-02 13:43 ` [Qemu-devel] " Marc Zyngier
2018-06-29 11:15 ` [PATCH v3 19/20] kvm: arm64: Allow IPA size supported by the system Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-02 13:50 ` Marc Zyngier
2018-07-02 13:50 ` Marc Zyngier
2018-07-02 13:50 ` [Qemu-devel] " Marc Zyngier
2018-07-02 13:54 ` Suzuki K Poulose
2018-07-02 13:54 ` Suzuki K Poulose
2018-07-02 13:54 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` [PATCH v3 20/20] kvm: arm64: Fall back to normal stage2 entry level Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` [kvmtool test PATCH 21/24] kvmtool: Allow backends to run checks on the KVM device fd Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` [kvmtool test PATCH 22/24] kvmtool: arm64: Add support for guest physical address size Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-04 14:09 ` Will Deacon
2018-07-04 14:09 ` Will Deacon
2018-07-04 14:09 ` [Qemu-devel] " Will Deacon
2018-07-04 15:00 ` Julien Grall
2018-07-04 15:00 ` Julien Grall
2018-07-04 15:00 ` [Qemu-devel] " Julien Grall
2018-07-04 15:52 ` Will Deacon
2018-07-04 15:52 ` Will Deacon
2018-07-04 15:52 ` [Qemu-devel] " Will Deacon
2018-07-05 12:47 ` Julien Grall
2018-07-05 12:47 ` Julien Grall
2018-07-05 12:47 ` [Qemu-devel] " Julien Grall
2018-07-05 13:20 ` Marc Zyngier
2018-07-05 13:20 ` Marc Zyngier
2018-07-05 13:20 ` [Qemu-devel] " Marc Zyngier
2018-07-05 13:46 ` Auger Eric
2018-07-05 13:46 ` Auger Eric
2018-07-05 13:46 ` [Qemu-devel] " Auger Eric
2018-07-05 14:12 ` Suzuki K Poulose
2018-07-05 14:12 ` Suzuki K Poulose
2018-07-05 14:12 ` [Qemu-devel] " Suzuki K Poulose
2018-07-05 14:15 ` Marc Zyngier
2018-07-05 14:15 ` Marc Zyngier
2018-07-05 14:15 ` [Qemu-devel] " Marc Zyngier
2018-07-05 14:37 ` Auger Eric
2018-07-05 14:37 ` Auger Eric
2018-07-05 14:37 ` [Qemu-devel] " Auger Eric
2018-06-29 11:15 ` [kvmtool test PATCH 23/24] kvmtool: arm64: Switch memory layout Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-06-29 11:15 ` [kvmtool test PATCH 24/24] kvmtool: arm: Add support for creating VM with PA size Suzuki K Poulose
2018-06-29 11:15 ` Suzuki K Poulose
2018-06-29 11:15 ` [Qemu-devel] " Suzuki K Poulose
2018-07-04 14:22 ` Will Deacon
2018-07-04 14:22 ` Will Deacon
2018-07-04 14:22 ` [Qemu-devel] " Will Deacon
2018-07-04 14:41 ` Marc Zyngier
2018-07-04 14:41 ` Marc Zyngier
2018-07-04 14:41 ` Marc Zyngier
2018-07-04 14:41 ` [Qemu-devel] " Marc Zyngier
2018-07-04 15:51 ` Will Deacon
2018-07-04 15:51 ` Will Deacon
2018-07-04 15:51 ` [Qemu-devel] " Will Deacon
2018-07-05 7:51 ` Peter Maydell
2018-07-05 7:51 ` Peter Maydell
2018-07-05 7:51 ` [Qemu-devel] " Peter Maydell
2018-07-05 7:58 ` Auger Eric
2018-07-05 7:58 ` Auger Eric
2018-07-05 7:58 ` [Qemu-devel] " Auger Eric
2018-07-04 15:58 ` Suzuki K Poulose
2018-07-04 15:58 ` Suzuki K Poulose
2018-07-04 15:58 ` [Qemu-devel] " Suzuki K Poulose
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