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Thu, 11 Sep 2025 06:49:40 -0700 (PDT) Received: from f4d4888f22f2.ant.amazon.com.com ([15.248.2.27]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3e760778915sm2608361f8f.12.2025.09.11.06.49.39 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 11 Sep 2025 06:49:40 -0700 (PDT) From: Jack Thomson To: maz@kernel.org, oliver.upton@linux.dev, pbonzini@redhat.com Cc: joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, shuah@kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, isaku.yamahata@intel.com, roypat@amazon.co.uk, kalyazin@amazon.co.uk, jackabt@amazon.com Subject: [PATCH 1/6] KVM: arm64: Add __gmem_abort and __user_mem_abort Date: Thu, 11 Sep 2025 14:46:43 +0100 Message-Id: <20250911134648.58945-2-jackabt.amazon@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250911134648.58945-1-jackabt.amazon@gmail.com> References: <20250911134648.58945-1-jackabt.amazon@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jack Thomson Adding __gmem_abort and __user_mem_abort that preserve -EAGAIN results. These will be used by the pre-fault implementation which needs to retry on -EAGAIN. Also add an optional page_size output parameter to __user_mem_abort to return the VMA page size, which will be needed for pre-faulting. No functional changes are intended Signed-off-by: Jack Thomson --- arch/arm64/kvm/mmu.c | 36 +++++++++++++++++++++++++++++------- 1 file changed, 29 insertions(+), 7 deletions(-) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index a36426ccd9b5..082e7d8ae655 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1521,9 +1521,9 @@ static void adjust_nested_fault_perms(struct kvm_s2_t= rans *nested, =20 #define KVM_PGTABLE_WALK_MEMABORT_FLAGS (KVM_PGTABLE_WALK_HANDLE_FAULT | K= VM_PGTABLE_WALK_SHARED) =20 -static int gmem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, - struct kvm_s2_trans *nested, - struct kvm_memory_slot *memslot, bool is_perm) +static int __gmem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, + struct kvm_s2_trans *nested, + struct kvm_memory_slot *memslot, bool is_perm) { bool write_fault, exec_fault, writable; enum kvm_pgtable_walk_flags flags =3D KVM_PGTABLE_WALK_MEMABORT_FLAGS; @@ -1592,13 +1592,22 @@ static int gmem_abort(struct kvm_vcpu *vcpu, phys_a= ddr_t fault_ipa, if (writable && !ret) mark_page_dirty_in_slot(kvm, memslot, gfn); =20 + return ret; +} + +static int gmem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, + struct kvm_s2_trans *nested, + struct kvm_memory_slot *memslot, bool is_perm) +{ + int ret =3D __gmem_abort(vcpu, fault_ipa, nested, memslot, is_perm); return ret !=3D -EAGAIN ? ret : 0; } =20 -static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, - struct kvm_s2_trans *nested, - struct kvm_memory_slot *memslot, unsigned long hva, - bool fault_is_perm) +static int __user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, + struct kvm_s2_trans *nested, + struct kvm_memory_slot *memslot, + long *page_size, unsigned long hva, + bool fault_is_perm) { int ret =3D 0; bool topup_memcache; @@ -1871,10 +1880,23 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, ph= ys_addr_t fault_ipa, kvm_release_faultin_page(kvm, page, !!ret, writable); kvm_fault_unlock(kvm); =20 + if (page_size) + *page_size =3D vma_pagesize; + /* Mark the page dirty only if the fault is handled successfully */ if (writable && !ret) mark_page_dirty_in_slot(kvm, memslot, gfn); =20 + return ret; +} + +static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, + struct kvm_s2_trans *nested, + struct kvm_memory_slot *memslot, unsigned long hva, + bool fault_is_perm) +{ + int ret =3D __user_mem_abort(vcpu, fault_ipa, nested, memslot, NULL, + hva, fault_is_perm); return ret !=3D -EAGAIN ? ret : 0; } =20 --=20 2.43.0