linux-kernel - Re: [PATCH 6/6] KVM: selftests: x86: Add test for KVM_PRE_FAULT

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Date: Mon, 22 Apr 2024 10:50:33 -0700
From: Isaku Yamahata <isaku.yamahata@...el.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	isaku.yamahata@...el.com, xiaoyao.li@...el.com,
	binbin.wu@...ux.intel.com, seanjc@...gle.com,
	rick.p.edgecombe@...el.com, isaku.yamahata@...ux.intel.com
Subject: Re: [PATCH 6/6] KVM: selftests: x86: Add test for
 KVM_PRE_FAULT_MEMORY

On Fri, Apr 19, 2024 at 04:59:27AM -0400,
Paolo Bonzini <pbonzini@...hat.com> wrote:

> From: Isaku Yamahata <isaku.yamahata@...el.com>
> 
> Add a test case to exercise KVM_PRE_FAULT_MEMORY and run the guest to access the
> pre-populated area.  It tests KVM_PRE_FAULT_MEMORY ioctl for KVM_X86_DEFAULT_VM
> and KVM_X86_SW_PROTECTED_VM.
> 
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> Message-ID: <32427791ef42e5efaafb05d2ac37fa4372715f47.1712785629.git.isaku.yamahata@...el.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  tools/include/uapi/linux/kvm.h                |   8 +
>  tools/testing/selftests/kvm/Makefile          |   1 +
>  .../selftests/kvm/pre_fault_memory_test.c     | 146 ++++++++++++++++++
>  3 files changed, 155 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/pre_fault_memory_test.c
> 
> diff --git a/tools/include/uapi/linux/kvm.h b/tools/include/uapi/linux/kvm.h
> index c3308536482b..4d66d8afdcd1 100644
> --- a/tools/include/uapi/linux/kvm.h
> +++ b/tools/include/uapi/linux/kvm.h
> @@ -2227,4 +2227,12 @@ struct kvm_create_guest_memfd {
>  	__u64 reserved[6];
>  };
>  
> +#define KVM_PRE_FAULT_MEMORY	_IOWR(KVMIO, 0xd5, struct kvm_pre_fault_memory)
> +
> +struct kvm_pre_fault_memory {
> +	__u64 gpa;
> +	__u64 size;
> +	__u64 flags;

nitpick: catch up for struct update.
+       __u64 padding[5];

> +};
> +
>  #endif /* __LINUX_KVM_H */
-- 
Isaku Yamahata <isaku.yamahata@...el.com>