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From: Marc Zyngier <maz@kernel.org>
To: David Brazdil <dbrazdil@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Will Deacon <will@kernel.org>,
	kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH 00/15] Split off nVHE hyp code
Date: Thu, 30 Apr 2020 18:53:47 +0100	[thread overview]
Message-ID: <73efca41e7b955db4963ff182624107d@kernel.org> (raw)
In-Reply-To: <20200430144831.59194-1-dbrazdil@google.com>

Hi David,

Thanks for posting this, looks quite interesting!

On 2020-04-30 15:48, David Brazdil wrote:
> Refactor files in arch/arm64/kvm/hyp to compile all code which runs in 
> EL2
> under nVHE into separate object files from the rest of KVM. This is 
> done in
> preparation for being able to unmap .hyp.text from EL1 but has other 
> benefits,
> notably:
>  * safe use of KASAN/UBSAN/GCOV instrumentation on VHE code,
>  * cleaner HVC API,
>  * no need for __hyp_text annotations.
> 
> nVHE-specific code is moved to hyp/nvhe and compiled with custom build 
> rules
> similar to those used by EFI stub. Shared source files are compiled 
> under both
> VHE and nVHE build rules. Where a source file contained both VHE and 
> nVHE code,
> it is split into a shared header file and two C source files. This is 
> done one
> file per commit to make review easier.

Do you have any figure on how much bigger the final kernel becomes once 
this
is applied? I guess I can find out pretty easily, but this is the kind 
of thing
that would be useful to make part of your cover letter.

I'll try to review this shortly.

Thanks,

         M.
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  parent reply	other threads:[~2020-04-30 17:53 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-30 14:48 [PATCH 00/15] Split off nVHE hyp code David Brazdil
2020-04-30 14:48 ` [PATCH 01/15] arm64: kvm: Unify users of HVC instruction David Brazdil
2020-05-07 14:01   ` Marc Zyngier
2020-05-07 14:36     ` Quentin Perret
2020-05-13 10:30       ` David Brazdil
2020-04-30 14:48 ` [PATCH 02/15] arm64: kvm: Formalize host-hyp hypcall ABI David Brazdil
2020-05-07 13:10   ` Marc Zyngier
2020-05-07 13:33     ` Quentin Perret
2020-05-10 10:16       ` Marc Zyngier
2020-05-13 10:48         ` David Brazdil
2020-04-30 14:48 ` [PATCH 03/15] arm64: kvm: Fix symbol dependency in __hyp_call_panic_nvhe David Brazdil
2020-05-07 13:22   ` Marc Zyngier
2020-05-07 14:36     ` David Brazdil
2020-05-10 11:14       ` Marc Zyngier
2020-04-30 14:48 ` [PATCH 04/15] arm64: kvm: Add build rules for separate nVHE object files David Brazdil
2020-05-07 13:46   ` Marc Zyngier
2020-04-30 14:48 ` [PATCH 05/15] arm64: kvm: Build hyp-entry.S separately for VHE/nVHE David Brazdil
2020-05-07 15:07   ` Marc Zyngier
2020-05-07 15:15     ` Marc Zyngier
2020-04-30 14:48 ` [PATCH 06/15] arm64: kvm: Move __smccc_workaround_1_smc to .rodata David Brazdil
2020-05-11 10:04   ` Marc Zyngier
2020-05-11 10:29     ` Will Deacon
2020-04-30 14:48 ` [PATCH 07/15] arm64: kvm: Split hyp/tlb.c to VHE/nVHE David Brazdil
2020-04-30 14:48 ` [PATCH 08/15] arm64: kvm: Split hyp/switch.c " David Brazdil
2020-04-30 14:48 ` [PATCH 09/15] arm64: kvm: Split hyp/debug-sr.c " David Brazdil
2020-04-30 14:48 ` [PATCH 10/15] arm64: kvm: Split hyp/sysreg-sr.c " David Brazdil
2020-04-30 14:48 ` [PATCH 11/15] arm64: kvm: Split hyp/timer-sr.c " David Brazdil
2020-04-30 14:48 ` [PATCH 12/15] arm64: kvm: Compile remaining hyp/ files for both VHE/nVHE David Brazdil
2020-04-30 14:48 ` [PATCH 13/15] arm64: kvm: Add comments around __hyp_text_ symbol aliases David Brazdil
2020-04-30 14:48 ` [PATCH 14/15] arm64: kvm: Remove __hyp_text macro, use build rules instead David Brazdil
2020-04-30 14:48 ` [PATCH 15/15] arm64: kvm: Lift instrumentation restrictions on VHE David Brazdil
2020-04-30 17:53 ` Marc Zyngier [this message]
2020-04-30 18:57   ` [PATCH 00/15] Split off nVHE hyp code David Brazdil

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