linux-kernel - Re: Re: linux-next: Tree for Jan 2 (riscv & KVM problem)

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Date: Wed, 3 Jan 2024 16:18:27 +0100
From: Andrew Jones <ajones@...tanamicro.com>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>, 
	Linux Next Mailing List <linux-next@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, 
	KVM list <kvm@...r.kernel.org>, linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: Re: linux-next: Tree for Jan 2 (riscv & KVM problem)

On Tue, Jan 02, 2024 at 10:07:21AM -0800, Randy Dunlap wrote:
> 
> 
> On 1/1/24 21:57, Stephen Rothwell wrote:
> > Hi all,
> > 
> > Changes since 20231222:
> > 
> 
> It is possible for a riscv randconfig to create a .config file with
> CONFIG_KVM enabled but CONFIG_HAVE_KVM is not set.
> Is that expected?
> 
> CONFIG_HAVE_KVM_IRQCHIP=y
> CONFIG_HAVE_KVM_IRQ_ROUTING=y
> CONFIG_KVM_MMIO=y
> CONFIG_HAVE_KVM_MSI=y
> CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT=y
> CONFIG_HAVE_KVM_VCPU_ASYNC_IOCTL=y
> CONFIG_KVM_XFER_TO_GUEST_WORK=y
> CONFIG_KVM_GENERIC_HARDWARE_ENABLING=y
> CONFIG_KVM_GENERIC_MMU_NOTIFIER=y
> CONFIG_VIRTUALIZATION=y
> CONFIG_KVM=m
> 
> Should arch/riscv/kvm/Kconfig: "config KVM" select HAVE_KVM
> along with the other selects there or should that "config KVM"
> depend on HAVE_KVM?

We probably should add a patch which makes RISCV select HAVE_KVM and
KVM depend on HAVE_KVM in order for riscv kvm to be consistent with
the other KVM supporting architectures.

> 
> 
> The problem .config file causes build errors because EVENTFD
> is not set:
> 
> ../arch/riscv/kvm/../../../virt/kvm/eventfd.c: In function 'kvm_irqfd_assign':
> ../arch/riscv/kvm/../../../virt/kvm/eventfd.c:335:19: error: implicit declaration of function 'eventfd_ctx_fileget'; did you mean 'eventfd_ctx_fdget'? [-Werror=implicit-function-declaration]
>   335 |         eventfd = eventfd_ctx_fileget(f.file);
>       |                   ^~~~~~~~~~~~~~~~~~~
>       |                   eventfd_ctx_fdget
> ../arch/riscv/kvm/../../../virt/kvm/eventfd.c:335:17: warning: assignment to 'struct eventfd_ctx *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
>   335 |         eventfd = eventfd_ctx_fileget(f.file);
>       |                 ^
>

Hmm. riscv kvm selects HAVE_KVM_EVENTFD, which selects EVENTFD. I'm
not sure how the lack of HAVE_KVM is leading to this.

Thanks,
drew