linux-kernel - Re: [PATCH] RISC-V: KVM: Require HAVE

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Message-ID: <20240104-d5ebb072b91a6f7abbb2ac76@orel>
Date: Thu, 4 Jan 2024 11:52:07 +0100
From: Andrew Jones <ajones@...tanamicro.com>
To: linux-riscv@...ts.infradead.org, linux-next@...r.kernel.org, 
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org
Cc: paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu, 
	anup@...infault.org, atishp@...shpatra.org, rdunlap@...radead.org, 
	sfr@...b.auug.org.au, mpe@...erman.id.au, npiggin@...il.com, 
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] RISC-V: KVM: Require HAVE_KVM


This applies to linux-next, but I forgot to append -next to the PATCH
prefix.

On Thu, Jan 04, 2024 at 11:43:08AM +0100, Andrew Jones wrote:
> KVM requires EVENTFD, which is selected by HAVE_KVM. Other KVM
> supporting architectures select HAVE_KVM and then their KVM
> Kconfigs ensure its there with a depends on HAVE_KVM. Make RISCV
> consistent with that approach which fixes configs which have KVM
> but not EVENTFD, as was discovered with a randconfig test.
> 
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Closes: https://lore.kernel.org/all/44907c6b-c5bd-4e4a-a921-e4d3825539d8@infradead.org/

I think powerpc may need a patch like this as well, since I don't see
anything ensuring EVENTFD is selected for it anymore either.

Thanks,
drew

> Signed-off-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>  arch/riscv/Kconfig     | 1 +
>  arch/riscv/kvm/Kconfig | 2 +-
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index a935a5f736b9..daba06a3b76f 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -128,6 +128,7 @@ config RISCV
>  	select HAVE_KPROBES if !XIP_KERNEL
>  	select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
>  	select HAVE_KRETPROBES if !XIP_KERNEL
> +	select HAVE_KVM
>  	# https://github.com/ClangBuiltLinux/linux/issues/1881
>  	select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if !LD_IS_LLD
>  	select HAVE_MOVE_PMD
> diff --git a/arch/riscv/kvm/Kconfig b/arch/riscv/kvm/Kconfig
> index 1fd76aee3b71..36fa8ec9e5ba 100644
> --- a/arch/riscv/kvm/Kconfig
> +++ b/arch/riscv/kvm/Kconfig
> @@ -19,7 +19,7 @@ if VIRTUALIZATION
>  
>  config KVM
>  	tristate "Kernel-based Virtual Machine (KVM) support (EXPERIMENTAL)"
> -	depends on RISCV_SBI && MMU
> +	depends on HAVE_KVM && RISCV_SBI && MMU
>  	select HAVE_KVM_IRQCHIP
>  	select HAVE_KVM_IRQ_ROUTING
>  	select HAVE_KVM_MSI
> -- 
> 2.43.0
>