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Message-ID: <75f13a8a-132f-99ee-d3c6-24a12f2f23d5@redhat.com>
Date:   Fri, 21 Jul 2023 17:14:31 +0200
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Subject: Re: [RFC PATCH v11 18/29] KVM: selftests: Drop unused
 kvm_userspace_memory_region_find() helper
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To:     Sean Christopherson <seanjc@google.com>,
        Marc Zyngier <maz@kernel.org>,
        Oliver Upton <oliver.upton@linux.dev>,
        Huacai Chen <chenhuacai@kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Anup Patel <anup@brainfault.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        "Matthew Wilcox (Oracle)" <willy@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Paul Moore <paul@paul-moore.com>,
        James Morris <jmorris@namei.org>,
        "Serge E. Hallyn" <serge@hallyn.com>
Cc:     kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        kvmarm@lists.linux.dev, linux-mips@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org,
        linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org,
        linux-mm@kvack.org, linux-security-module@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Chao Peng <chao.p.peng@linux.intel.com>,
        Fuad Tabba <tabba@google.com>,
        Jarkko Sakkinen <jarkko@kernel.org>,
        Yu Zhang <yu.c.zhang@linux.intel.com>,
        Vishal Annapurve <vannapurve@google.com>,
        Ackerley Tng <ackerleytng@google.com>,
        Maciej Szmigiero <mail@maciej.szmigiero.name>,
        Vlastimil Babka <vbabka@suse.cz>,
        David Hildenbrand <david@redhat.com>,
        Quentin Perret <qperret@google.com>,
        Michael Roth <michael.roth@amd.com>,
        Wang <wei.w.wang@intel.com>,
        Liam Merwick <liam.merwick@oracle.com>,
        Isaku Yamahata <isaku.yamahata@gmail.com>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
References: <20230718234512.1690985-1-seanjc@google.com>
 <20230718234512.1690985-19-seanjc@google.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
In-Reply-To: <20230718234512.1690985-19-seanjc@google.com>
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On 7/19/23 01:45, Sean Christopherson wrote:
> Drop kvm_userspace_memory_region_find(), it's unused and a terrible API
> (probably why it's unused).  If anything outside of kvm_util.c needs to
> get at the memslot, userspace_mem_region_find() can be exposed to give
> others full access to all memory region/slot information.
> 
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>   .../selftests/kvm/include/kvm_util_base.h     |  4 ---
>   tools/testing/selftests/kvm/lib/kvm_util.c    | 29 -------------------
>   2 files changed, 33 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
> index 07732a157ccd..6aeb008dd668 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> @@ -753,10 +753,6 @@ vm_adjust_num_guest_pages(enum vm_guest_mode mode, unsigned int num_guest_pages)
>   	return n;
>   }
>   
> -struct kvm_userspace_memory_region *
> -kvm_userspace_memory_region_find(struct kvm_vm *vm, uint64_t start,
> -				 uint64_t end);
> -
>   #define sync_global_to_guest(vm, g) ({				\
>   	typeof(g) *_p = addr_gva2hva(vm, (vm_vaddr_t)&(g));	\
>   	memcpy(_p, &(g), sizeof(g));				\
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index 9741a7ff6380..45d21e052db0 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -586,35 +586,6 @@ userspace_mem_region_find(struct kvm_vm *vm, uint64_t start, uint64_t end)
>   	return NULL;
>   }
>   
> -/*
> - * KVM Userspace Memory Region Find
> - *
> - * Input Args:
> - *   vm - Virtual Machine
> - *   start - Starting VM physical address
> - *   end - Ending VM physical address, inclusive.
> - *
> - * Output Args: None
> - *
> - * Return:
> - *   Pointer to overlapping region, NULL if no such region.
> - *
> - * Public interface to userspace_mem_region_find. Allows tests to look up
> - * the memslot datastructure for a given range of guest physical memory.
> - */
> -struct kvm_userspace_memory_region *
> -kvm_userspace_memory_region_find(struct kvm_vm *vm, uint64_t start,
> -				 uint64_t end)
> -{
> -	struct userspace_mem_region *region;
> -
> -	region = userspace_mem_region_find(vm, start, end);
> -	if (!region)
> -		return NULL;
> -
> -	return &region->region;
> -}
> -
>   __weak void vcpu_arch_free(struct kvm_vcpu *vcpu)
>   {
>   

Will queue this.

Paolo