linux-kernel - Re: [RFC PATCH v2 3/7] KVM: selftests: Make a generic helper to get vm guest mode strings

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Date:   Thu, 25 Feb 2021 19:55:06 +0100
From:   Andrew Jones <drjones@...hat.com>
To:     Yanan Wang <wangyanan55@...wei.com>
Cc:     kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Ben Gardon <bgardon@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Peter Xu <peterx@...hat.com>,
        Marc Zyngier <maz@...nel.org>, wanghaibin.wang@...wei.com,
        yuzenghui@...wei.com
Subject: Re: [RFC PATCH v2 3/7] KVM: selftests: Make a generic helper to get
 vm guest mode strings

On Thu, Feb 25, 2021 at 01:59:36PM +0800, Yanan Wang wrote:
> For generality and conciseness, make an API which can be used in all
> kvm libs and selftests to get vm guest mode strings. And the index i
> is checked in the API in case of possiable faults.
> 
> Signed-off-by: Yanan Wang <wangyanan55@...wei.com>
> ---
>  .../testing/selftests/kvm/include/kvm_util.h  |  4 +--
>  tools/testing/selftests/kvm/lib/kvm_util.c    | 29 ++++++++++++-------
>  2 files changed, 19 insertions(+), 14 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index 2d7eb6989e83..f52a7492f47f 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -68,9 +68,6 @@ enum vm_guest_mode {
>  #define MIN_PAGE_SIZE		(1U << MIN_PAGE_SHIFT)
>  #define PTES_PER_MIN_PAGE	ptes_per_page(MIN_PAGE_SIZE)
>  
> -#define vm_guest_mode_string(m) vm_guest_mode_string[m]
> -extern const char * const vm_guest_mode_string[];
> -
>  struct vm_guest_mode_params {
>  	unsigned int pa_bits;
>  	unsigned int va_bits;
> @@ -84,6 +81,7 @@ int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap);
>  int vcpu_enable_cap(struct kvm_vm *vm, uint32_t vcpu_id,
>  		    struct kvm_enable_cap *cap);
>  void vm_enable_dirty_ring(struct kvm_vm *vm, uint32_t ring_size);
> +const char *vm_guest_mode_string(uint32_t i);
>  
>  struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm);
>  void kvm_vm_free(struct kvm_vm *vmp);
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index d787cb802b4a..cc22c4ab7d67 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -141,17 +141,24 @@ static void vm_open(struct kvm_vm *vm, int perm)
>  		"rc: %i errno: %i", vm->fd, errno);
>  }
>  
> -const char * const vm_guest_mode_string[] = {
> -	"PA-bits:52,  VA-bits:48,  4K pages",
> -	"PA-bits:52,  VA-bits:48, 64K pages",
> -	"PA-bits:48,  VA-bits:48,  4K pages",
> -	"PA-bits:48,  VA-bits:48, 64K pages",
> -	"PA-bits:40,  VA-bits:48,  4K pages",
> -	"PA-bits:40,  VA-bits:48, 64K pages",
> -	"PA-bits:ANY, VA-bits:48,  4K pages",
> -};
> -_Static_assert(sizeof(vm_guest_mode_string)/sizeof(char *) == NUM_VM_MODES,
> -	       "Missing new mode strings?");
> +const char *vm_guest_mode_string(uint32_t i)
> +{
> +	static const char * const strings[] = {
> +		[VM_MODE_P52V48_4K]	= "PA-bits:52,  VA-bits:48,  4K pages",
> +		[VM_MODE_P52V48_64K]	= "PA-bits:52,  VA-bits:48, 64K pages",
> +		[VM_MODE_P48V48_4K]	= "PA-bits:48,  VA-bits:48,  4K pages",
> +		[VM_MODE_P48V48_64K]	= "PA-bits:48,  VA-bits:48, 64K pages",
> +		[VM_MODE_P40V48_4K]	= "PA-bits:40,  VA-bits:48,  4K pages",
> +		[VM_MODE_P40V48_64K]	= "PA-bits:40,  VA-bits:48, 64K pages",
> +		[VM_MODE_PXXV48_4K]	= "PA-bits:ANY, VA-bits:48,  4K pages",
> +	};
> +	_Static_assert(sizeof(strings)/sizeof(char *) == NUM_VM_MODES,
> +		       "Missing new mode strings?");
> +
> +	TEST_ASSERT(i < NUM_VM_MODES, "Guest mode ID %d too big", i);
> +
> +	return strings[i];
> +}
>  
>  const struct vm_guest_mode_params vm_guest_mode_params[] = {
>  	{ 52, 48,  0x1000, 12 },
> -- 
> 2.19.1
>

Reviewed-by: Andrew Jones <drjones@...hat.com>