linux-kernel - RE: [PATCH 00/26] KVM: vfio: Hide KVM internals from others

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Date: Mon, 24 Jun 2024 19:21:32 +0000
From: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To: Sean Christopherson <seanjc@...gle.com>
CC: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
	Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, "Huacai
 Chen" <chenhuacai@...nel.org>, Michael Ellerman <mpe@...erman.id.au>, "Anup
 Patel" <anup@...infault.org>, Paul Walmsley <paul.walmsley@...ive.com>,
	"Palmer Dabbelt" <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
	"Heiko Carstens" <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
	"Alexander Gordeev" <agordeev@...ux.ibm.com>, Christian Borntraeger
	<borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>, "Claudio
 Imbrenda" <imbrenda@...ux.ibm.com>, Thomas Gleixner <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, "x86@...nel.org" <x86@...nel.org>, "Peter
 Zijlstra" <peterz@...radead.org>, Arnaldo Carvalho de Melo <acme@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>, Tony Krowiak <akrowiak@...ux.ibm.com>,
	Halil Pasic <pasic@...ux.ibm.com>, Jason Herne <jjherne@...ux.ibm.com>,
	Harald Freudenberger <freude@...ux.ibm.com>, Alex Williamson
	<alex.williamson@...hat.com>, Andy Lutomirski <luto@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "kvmarm@...ts.linux.dev"
	<kvmarm@...ts.linux.dev>, "linux-mips@...r.kernel.org"
	<linux-mips@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"kvm-riscv@...ts.infradead.org" <kvm-riscv@...ts.infradead.org>,
	"linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>, "Anish
 Ghulati" <aghulati@...gle.com>, Venkatesh Srinivas <venkateshs@...omium.org>,
	Andrew Thornton <andrewth@...gle.com>
Subject: RE: [PATCH 00/26] KVM: vfio: Hide KVM internals from others



> -----Original Message-----
> From: Sean Christopherson <seanjc@...gle.com>
> Sent: Monday, June 24, 2024 4:32 PM
> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
> Cc: Catalin Marinas <catalin.marinas@....com>; Will Deacon
> <will@...nel.org>; Marc Zyngier <maz@...nel.org>; Oliver Upton
> <oliver.upton@...ux.dev>; Huacai Chen <chenhuacai@...nel.org>; Michael
> Ellerman <mpe@...erman.id.au>; Anup Patel <anup@...infault.org>; Paul
> Walmsley <paul.walmsley@...ive.com>; Palmer Dabbelt
> <palmer@...belt.com>; Albert Ou <aou@...s.berkeley.edu>; Heiko
> Carstens <hca@...ux.ibm.com>; Vasily Gorbik <gor@...ux.ibm.com>;
> Alexander Gordeev <agordeev@...ux.ibm.com>; Christian Borntraeger
> <borntraeger@...ux.ibm.com>; Janosch Frank <frankja@...ux.ibm.com>;
> Claudio Imbrenda <imbrenda@...ux.ibm.com>; Thomas Gleixner
> <tglx@...utronix.de>; Ingo Molnar <mingo@...hat.com>; Borislav Petkov
> <bp@...en8.de>; Dave Hansen <dave.hansen@...ux.intel.com>;
> x86@...nel.org; Peter Zijlstra <peterz@...radead.org>; Arnaldo Carvalho de
> Melo <acme@...nel.org>; Paolo Bonzini <pbonzini@...hat.com>; Tony
> Krowiak <akrowiak@...ux.ibm.com>; Halil Pasic <pasic@...ux.ibm.com>;
> Jason Herne <jjherne@...ux.ibm.com>; Harald Freudenberger
> <freude@...ux.ibm.com>; Alex Williamson <alex.williamson@...hat.com>;
> Andy Lutomirski <luto@...nel.org>; linux-arm-kernel@...ts.infradead.org;
> kvmarm@...ts.linux.dev; linux-mips@...r.kernel.org; kvm@...r.kernel.org;
> linuxppc-dev@...ts.ozlabs.org; kvm-riscv@...ts.infradead.org; linux-
> riscv@...ts.infradead.org; linux-s390@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-perf-users@...r.kernel.org; Anish Ghulati
> <aghulati@...gle.com>; Venkatesh Srinivas <venkateshs@...omium.org>;
> Andrew Thornton <andrewth@...gle.com>
> Subject: Re: [PATCH 00/26] KVM: vfio: Hide KVM internals from others
> 
> On Thu, Jun 20, 2024, Shameerali Kolothum Thodi wrote:
> > > This is a borderline RFC series to hide KVM's internals from the rest of
> > > the kernel, where "internals" means data structures, enums, #defines,
> > > APIs, etc. that are intended to be KVM-only, but are exposed
> everywhere
> > > due to kvm_host.h (and other headers) living in the global include paths.
> >
> > Hi Sean,
> >
> > Just thought of checking with you on this series. Do you have plans to
> revive this
> > series?
> 
> Yep!
> 
> > The reason I am asking is, on ARM64/KVM side we do have a requirement
> > to share the KVM VMID with SMMUV3. Please see the RFC I sent out
> earlier this
> > year[1]. The series basically provides a way for KVM to pin a VMID and also
> > associates an iommufd ctx with a struct kvm * to retrieve that VMID.
> >
> > As mentioned above, some of the patches in this series(especially 1-4 & 6)
> that
> > does the VFIO cleanups and dropping CONFIG_KVM_VFIO looks very
> straightforward
> > and useful. I am thinking of including those when I re-spin my RFC series, if
> > that’s ok.
> 
> Please don't include them, as the patch they build towards (patch 5) is
> buggy[*],
> and I am fairly certain that at least some of the patches will change
> significantly.

Ok. Got it. Thanks for taking a look at the KVM pinned VMID series and comments
there.

Shameer