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From: Auger Eric <eric.auger@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>,
	Will Deacon <will.deacon@arm.com>
Cc: Christoffer Dall <cdall@kernel.org>,
	kvm-devel <kvm@vger.kernel.org>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Punit Agrawal <punit.agrawal@arm.com>,
	lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>,
	QEMU Developers <qemu-devel@nongnu.org>,
	kvmarm@lists.cs.columbia.edu,
	arm-mail-list <linux-arm-kernel@lists.infradead.org>
Subject: Re: [kvmtool test PATCH 24/24] kvmtool: arm: Add support for creating VM with PA size
Date: Thu, 5 Jul 2018 09:58:50 +0200	[thread overview]
Message-ID: <c04ac446-ec16-6ec9-383a-e93f0e2d7275@redhat.com> (raw)
In-Reply-To: <CAFEAcA9wgnbK8PHMvksezHqgN1BQZd_+sxXCe85AW+E+cfrcXg@mail.gmail.com>

Hi,

On 07/05/2018 09:51 AM, Peter Maydell wrote:
> On 4 July 2018 at 16:51, Will Deacon <will.deacon@arm.com> wrote:
>> On Wed, Jul 04, 2018 at 03:41:18PM +0100, Marc Zyngier wrote:
>>> Not really. Let's say I want my IPA space split in two: memory covers
>>> the low 47 bit, and I want MMIO spanning the top 47 bit. With your
>>> scheme, you'd end-up with a 47bit IPA space, while you really want 48
>>> bits (MMIO space implemented by userspace isn't registered to the
>>> kernel).
>>
>> That still sounds quite niche for a VM. Does QEMU do that?
> 
> Not at 47 bits, but we have RAM up to the 256GB mark, and
> MMIO above that (including a large PCI window), so the general
> arrangement of having the top end of the IPA space not
> necessarily be things we've told the kernel about definitely
> exists.

Is this document (2012) still a reference document?
http://infocenter.arm.com/help/topic/com.arm.doc.den0001c/DEN0001C_principles_of_arm_memory_maps.pdf
(especially Fig 5?)

Peter, comments in QEMU hw/arm/virt.c suggested next RAM chunk should be
added at 2TB. This doc suggests to put it at 8TB. I understand the PA
memory map only is suggested but shouldn't we align?

Thanks

Eric


> 
> thanks
> -- PMM
> _______________________________________________
> kvmarm mailing list
> kvmarm@lists.cs.columbia.edu
> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
> 

  reply	other threads:[~2018-07-05  7:58 UTC|newest]

Thread overview: 88+ 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 ` [PATCH v3 01/20] virtio: mmio-v1: Validate queue PFN Suzuki K Poulose
2018-06-29 17:42   ` Michael S. Tsirkin
2018-07-03  8:04     ` Suzuki K Poulose
2018-07-04  5:37       ` Michael S. Tsirkin
2018-06-29 11:15 ` [PATCH v3 02/20] virtio: pci-legacy: Validate queue pfn Suzuki K Poulose
2018-06-29 17:42   ` 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 14:50   ` Auger Eric
2018-06-29 11:15 ` [PATCH v3 04/20] kvm: arm64: Clean up VTCR_EL2 initialisation Suzuki K Poulose
2018-06-29 14:50   ` 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 14:50   ` Auger Eric
2018-07-02  9:59   ` Marc Zyngier
2018-06-29 11:15 ` [PATCH v3 06/20] kvm: arm/arm64: Remove spurious WARN_ON Suzuki K Poulose
2018-06-29 14:51   ` Auger Eric
2018-07-02 10:01   ` Marc Zyngier
2018-06-29 11:15 ` [PATCH v3 07/20] kvm: arm/arm64: Prepare for VM specific stage2 translations Suzuki K Poulose
2018-07-02 10:12   ` Marc Zyngier
2018-07-02 10:25     ` Suzuki K Poulose
2018-07-02 10:51   ` Auger Eric
2018-07-02 10:59     ` Suzuki K Poulose
2018-06-29 11:15 ` [PATCH v3 08/20] kvm: arm/arm64: Abstract stage2 pgd table allocation Suzuki K Poulose
2018-07-02 15:01   ` Auger Eric
2018-06-29 11:15 ` [PATCH v3 09/20] kvm: arm64: Make stage2 page table layout dynamic Suzuki K Poulose
2018-07-02 10:57   ` Suzuki K Poulose
2018-07-02 12:14   ` Auger Eric
2018-07-02 13:24     ` Suzuki K Poulose
2018-07-02 14:46       ` [Qemu-devel] " Auger Eric
2018-06-29 11:15 ` [PATCH v3 10/20] kvm: arm64: Dynamic configuration of VTTBR mask Suzuki K Poulose
2018-07-02 14:41   ` Auger Eric
2018-07-03 11:54     ` Suzuki K Poulose
2018-07-04  8:24       ` Auger Eric
2018-07-04  8:29         ` Suzuki K Poulose
2018-06-29 11:15 ` [PATCH v3 11/20] kvm: arm64: Helper for computing VTCR_EL2.SL0 Suzuki K Poulose
2018-07-02 14:59   ` 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
2018-07-02 19:13   ` Auger Eric
2018-06-29 11:15 ` [PATCH v3 13/20] kvm: arm64: Configure VTCR per VM Suzuki K Poulose
2018-07-02 12:16   ` Marc Zyngier
2018-07-03 10:48     ` Suzuki K Poulose
2018-07-03 10:58       ` 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 ` [PATCH v3 15/20] kvm: arm/arm64: Allow tuning the physical address size " Suzuki K Poulose
2018-07-02 13:13   ` Marc Zyngier
2018-07-02 13:31     ` Suzuki K Poulose
2018-07-04 15:51   ` Will Deacon
2018-07-04 22:03     ` Suzuki K Poulose
2018-07-06 13:49       ` Suzuki K Poulose
2018-07-06 15:09         ` Marc Zyngier
2018-07-06 16:39           ` Suzuki K Poulose
2018-07-09 11:23             ` Dave Martin
2018-07-09 12:29               ` Marc Zyngier
2018-07-09 13:37                 ` Dave Martin
2018-07-10 16:38                   ` Suzuki K Poulose
2018-07-10 17:03                     ` Dave Martin
2018-07-11  9:05                       ` Suzuki K Poulose
2018-07-11 10:38                         ` Dave Martin
2018-06-29 11:15 ` [PATCH v3 16/20] kvm: arm64: Switch to per VM IPA limit Suzuki K Poulose
2018-07-02 13:32   ` Marc Zyngier
2018-07-02 13:53     ` Suzuki K Poulose
2018-06-29 11:15 ` [PATCH v3 17/20] vgic: Add support for 52bit guest physical address Suzuki K Poulose
2018-07-04  8:09   ` Auger Eric
2018-06-29 11:15 ` [PATCH v3 18/20] kvm: arm64: Add support for handling 52bit IPA Suzuki K Poulose
2018-07-02 13:43   ` Marc Zyngier
2018-06-29 11:15 ` [PATCH v3 19/20] kvm: arm64: Allow IPA size supported by the system Suzuki K Poulose
2018-07-02 13:50   ` Marc Zyngier
2018-07-02 13:54     ` 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 ` [kvmtool test PATCH 21/24] kvmtool: Allow backends to run checks on the KVM device fd 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
2018-07-04 14:09   ` Will Deacon
2018-07-04 15:00     ` Julien Grall
2018-07-04 15:52       ` Will Deacon
2018-07-05 12:47         ` Julien Grall
2018-07-05 13:20           ` Marc Zyngier
2018-07-05 13:46             ` Auger Eric
2018-07-05 14:12               ` Suzuki K Poulose
2018-07-05 14:15               ` Marc Zyngier
2018-07-05 14:37                 ` 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 ` [kvmtool test PATCH 24/24] kvmtool: arm: Add support for creating VM with PA size Suzuki K Poulose
2018-07-04 14:22   ` Will Deacon
2018-07-04 14:41     ` Marc Zyngier
2018-07-04 15:51       ` Will Deacon
2018-07-05  7:51         ` Peter Maydell
2018-07-05  7:58           ` Auger Eric [this message]
2018-07-04 15:58     ` Suzuki K Poulose

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