linux-kernel - Re: [PATCH v1 1/4] selftests: kvm: Add kvm selftests header files for LoongArch

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Message-ID: <ZMqL7qPyngxOH4Y0@google.com>
Date:   Wed, 2 Aug 2023 10:01:34 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Tianrui Zhao <zhaotianrui@...ngson.cn>
Cc:     Shuah Khan <shuah@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Vishal Annapurve <vannapurve@...gle.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>, loongarch@...ts.linux.dev,
        Peter Xu <peterx@...hat.com>,
        Vipin Sharma <vipinsh@...gle.com>, maobibo@...ngson.cn
Subject: Re: [PATCH v1 1/4] selftests: kvm: Add kvm selftests header files for LoongArch

On Tue, Aug 01, 2023, Tianrui Zhao wrote:
> Add kvm selftests header files for LoongArch, including processor.h,
> sysreg.h, and kvm_util_base.h. Those mainly contain LoongArch CSR
> register defines and page table information.
> 
> Based-on: <20230720062813.4126751-1-zhaotianrui@...ngson.cn>
> Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
> ---
>  .../selftests/kvm/include/kvm_util_base.h     |  5 ++
>  .../kvm/include/loongarch/processor.h         | 28 ++++++
>  .../selftests/kvm/include/loongarch/sysreg.h  | 89 +++++++++++++++++++
>  3 files changed, 122 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/include/loongarch/processor.h
>  create mode 100644 tools/testing/selftests/kvm/include/loongarch/sysreg.h
> 
> diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
> index 07732a157ccd..8747127e0bab 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> @@ -197,6 +197,11 @@ extern enum vm_guest_mode vm_mode_default;
>  #define MIN_PAGE_SHIFT			12U
>  #define ptes_per_page(page_size)	((page_size) / 8)
>  
> +#elif defined(__loongarch__)
> +#define VM_MODE_DEFAULT			VM_MODE_P36V47_16K
> +#define MIN_PAGE_SHIFT			14U
> +#define ptes_per_page(page_size)	((page_size) / 8)
> +
>  #endif
>  
>  #define MIN_PAGE_SIZE		(1U << MIN_PAGE_SHIFT)
> diff --git a/tools/testing/selftests/kvm/include/loongarch/processor.h b/tools/testing/selftests/kvm/include/loongarch/processor.h
> new file mode 100644
> index 000000000000..d67796af51a0
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/include/loongarch/processor.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * LoongArch processor specific defines

Nit, my preference is to not bother with these types of comments, it should be
quite obvious from the file name that that everything in here is LoongArch
specific.

> + */
> +#ifndef SELFTEST_KVM_PROCESSOR_H
> +#define SELFTEST_KVM_PROCESSOR_H
> +
> +#include <linux/compiler.h>
> +#define _PAGE_VALID_SHIFT	0
> +#define _PAGE_DIRTY_SHIFT	1
> +#define _PAGE_PLV_SHIFT		2  /* 2~3, two bits */
> +#define _CACHE_SHIFT		4  /* 4~5, two bits */
> +#define _PAGE_PRESENT_SHIFT	7
> +#define _PAGE_WRITE_SHIFT	8
> +
> +#define PLV_KERN		0
> +#define PLV_USER		3
> +#define PLV_MASK		0x3
> +
> +#define _PAGE_VALID		(0x1UL << _PAGE_VALID_SHIFT)
> +#define _PAGE_PRESENT		(0x1UL << _PAGE_PRESENT_SHIFT)
> +#define _PAGE_WRITE		(0x1UL << _PAGE_WRITE_SHIFT)
> +#define _PAGE_DIRTY		(0x1UL << _PAGE_DIRTY_SHIFT)
> +#define _PAGE_USER		(PLV_USER << _PAGE_PLV_SHIFT)
> +#define __READABLE		(_PAGE_VALID)
> +#define __WRITEABLE		(_PAGE_DIRTY | _PAGE_WRITE)
> +#define _CACHE_CC		(0x1UL << _CACHE_SHIFT) /* Coherent Cached */
> +#endif
> diff --git a/tools/testing/selftests/kvm/include/loongarch/sysreg.h b/tools/testing/selftests/kvm/include/loongarch/sysreg.h
> new file mode 100644
> index 000000000000..04f53674c9d8
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/include/loongarch/sysreg.h

Any reason these can't simply go in processor.h?  Neither file is particular large,
especially for CPU definition files.

> @@ -0,0 +1,89 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +#ifndef SELFTEST_KVM_SYSREG_H
> +#define SELFTEST_KVM_SYSREG_H
> +
> +/*
> + * note that this declaration raises a checkpatch warning, but
> + * no good way to avoid it.
> + */

Definitely drop this comment, once the patch is applied the fact that checkpatch
complains is irrelevant.

> +#define zero	$r0