From: Peter Maydell <peter.maydell@linaro.org>
To: Alexander Graf <agraf@csgraf.de>
Cc: Eduardo Habkost <ehabkost@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
QEMU Developers <qemu-devel@nongnu.org>,
Cameron Esfahani <dirty@apple.com>,
Roman Bolshakov <r.bolshakov@yadro.com>,
qemu-arm <qemu-arm@nongnu.org>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH 8/8] hw/arm/virt: Disable highmem when on hypervisor.framework
Date: Thu, 26 Nov 2020 21:54:41 +0000 [thread overview]
Message-ID: <CAFEAcA95L=25QM4BTPbDV6HXLXD5zh+50WTVtrK=fKPwynV=vg@mail.gmail.com> (raw)
In-Reply-To: <20201126213600.40654-9-agraf@csgraf.de>
On Thu, 26 Nov 2020 at 21:36, Alexander Graf <agraf@csgraf.de> wrote:
> The Apple M1 only supports up to 36 bits of physical address space. That
> means we can not fit the 64bit MMIO BAR region into our address space.
>
> To fix this, let's not expose a 64bit MMIO BAR region when running on
> Apple Silicon.
>
> I have not been able to find a way to enumerate that easily, so let's
> just assume we always have that little PA space on hypervisor.framework
> systems.
If you have direct access to the host ID_AA64MMFR0_EL1 you can look
at the PARange field; otherwise start a stunt VM and look at its
ID_AA64MMFR0_EL1.PARange (this is what we do for KVM to query various
things about the VM's capabilities/ID regs).
thanks
-- PMM
next prev parent reply other threads:[~2020-11-26 21:56 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20201126213600.40654-1-agraf@csgraf.de>
[not found] ` <20201126213600.40654-5-agraf@csgraf.de>
2020-11-26 21:47 ` [PATCH 4/8] arm: Synchronize CPU on PSCI on Peter Maydell
2020-11-26 22:16 ` Alexander Graf
2020-11-26 22:26 ` Peter Maydell
2020-11-26 23:32 ` Alexander Graf
2020-11-27 4:41 ` Paolo Bonzini
2020-11-27 10:58 ` Alexander Graf
2020-11-27 11:21 ` Paolo Bonzini
[not found] ` <20201126213600.40654-9-agraf@csgraf.de>
2020-11-26 21:54 ` Peter Maydell [this message]
2020-11-26 22:17 ` [PATCH 8/8] hw/arm/virt: Disable highmem when on hypervisor.framework Alexander Graf
2020-11-26 22:33 ` Peter Maydell
2020-11-26 21:50 [PATCH 0/8] hvf: Implement Apple Silicon Support Alexander Graf
2020-11-26 21:50 ` [PATCH 8/8] hw/arm/virt: Disable highmem when on hypervisor.framework Alexander Graf
2020-11-26 22:14 ` Eduardo Habkost
2020-11-26 22:29 ` Peter Maydell
2020-11-27 16:26 ` Eduardo Habkost
2020-11-27 16:38 ` Peter Maydell
2020-11-27 16:47 ` Eduardo Habkost
2020-11-27 16:53 ` Peter Maydell
2020-11-27 17:17 ` Eduardo Habkost
2020-11-27 18:16 ` Peter Maydell
2020-11-27 18:20 ` Eduardo Habkost
2020-11-27 16:47 ` Peter Maydell
2020-11-30 2:40 ` Alexander Graf
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