From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: linuxppc-dev@lists.ozlabs.org, Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: Frederic Barrat <fbarrat@linux.ibm.com>,
kvm-ppc@vger.kernel.org,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH kernel v2] KVM: PPC: Fix TCE handling for VFIO
Date: Sun, 24 Apr 2022 12:15:20 +0000 [thread overview]
Message-ID: <165080252010.1540533.16052214523820715749.b4-ty@ellerman.id.au> (raw)
In-Reply-To: <20220420050840.328223-1-aik@ozlabs.ru>
On Wed, 20 Apr 2022 15:08:40 +1000, Alexey Kardashevskiy wrote:
> The LoPAPR spec defines a guest visible IOMMU with a variable page size.
> Currently QEMU advertises 4K, 64K, 2M, 16MB pages, a Linux VM picks
> the biggest (16MB). In the case of a passed though PCI device, there is
> a hardware IOMMU which does not support all pages sizes from the above -
> P8 cannot do 2MB and P9 cannot do 16MB. So for each emulated
> 16M IOMMU page we may create several smaller mappings ("TCEs") in
> the hardware IOMMU.
>
> [...]
Applied to powerpc/fixes.
[1/1] KVM: PPC: Fix TCE handling for VFIO
https://git.kernel.org/powerpc/c/26a62b750a4e6364b0393562f66759b1494c3a01
cheers
prev parent reply other threads:[~2022-04-24 12:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-20 5:08 [PATCH kernel v2] KVM: PPC: Fix TCE handling for VFIO Alexey Kardashevskiy
2022-04-24 12:15 ` Michael Ellerman [this message]
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