linux-kernel - Re: [kvmtool PATCH 21/17] kvmtool: arm: Add support for creating VM with PA size

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Date:   Mon, 30 Apr 2018 15:17:01 +0100
From:   Julien Grall <julien.grall@....com>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     ard.biesheuvel@...aro.org, kvm@...r.kernel.org,
        marc.zyngier@....com, catalin.marinas@....com,
        punit.agrawal@....com, will.deacon@....com,
        linux-kernel@...r.kernel.org, kristina.martsenko@....com,
        pbonzini@...hat.com, kvmarm@...ts.cs.columbia.edu
Subject: Re: [kvmtool PATCH 21/17] kvmtool: arm: Add support for creating VM
 with PA size

Hi,

On 27/03/18 14:15, Suzuki K Poulose wrote:
> diff --git a/arm/kvm.c b/arm/kvm.c
> index 5701d41..a9a9140 100644
> --- a/arm/kvm.c
> +++ b/arm/kvm.c
> @@ -11,6 +11,8 @@
>   #include <linux/kvm.h>
>   #include <linux/sizes.h>
>   
> +unsigned long kvm_arm_type;
> +
>   struct kvm_ext kvm_req_ext[] = {
>   	{ DEFINE_KVM_EXT(KVM_CAP_IRQCHIP) },
>   	{ DEFINE_KVM_EXT(KVM_CAP_ONE_REG) },
> @@ -18,6 +20,25 @@ struct kvm_ext kvm_req_ext[] = {
>   	{ 0, 0 },
>   };
>   
> +#ifndef KVM_ARM_GET_MAX_VM_PHYS_SHIFT
> +#define KVM_ARM_GET_MAX_VM_PHYS_SHIFT		_IO(KVMIO, 0x0a)
> +#endif
> +
> +void kvm__arch_init_hyp(struct kvm *kvm)
> +{
> +	unsigned max_ipa;
> +
> +	max_ipa = ioctl(kvm->sys_fd, KVM_ARM_GET_MAX_VM_PHYS_SHIFT);
> +	if (max_ipa < 0)

Another issues spotted while doing some testing. This will always be 
false because max_ipa is unsigned.

I think we want to turn max_ipa to signed.

Cheers,

-- 
Julien Grall