linux-kernel - [PATCH RFCv2 6/9] kvm/arm64: Export kvm_handle_user_mem

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Date:   Fri,  8 May 2020 13:29:16 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        maz@...nel.org, mark.rutland@....com, will@...nel.org,
        catalin.marinas@....com, james.morse@....com,
        suzuki.poulose@....com, drjones@...hat.com, eric.auger@...hat.com,
        aarcange@...hat.com, shan.gavin@...il.com
Subject: [PATCH RFCv2 6/9] kvm/arm64: Export kvm_handle_user_mem_abort() with prefault mode

This renames user_mem_abort() to kvm_handle_user_mem_abort(), and
then export it. The function will be used in asynchronous page fault
to populate a page table entry once the corresponding page is populated
from the backup device (e.g. swap partition):

   * Parameter @fault_status is replace by @esr.
   * The parameters are reorder based on their importance.

This shouldn't cause any functional changes.

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 arch/arm64/include/asm/kvm_host.h |  4 ++++
 virt/kvm/arm/mmu.c                | 14 ++++++++------
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 32c8a675e5a4..f77c706777ec 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -437,6 +437,10 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 			      struct kvm_vcpu_events *events);
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
+int kvm_handle_user_mem_abort(struct kvm_vcpu *vcpu, unsigned int esr,
+			      struct kvm_memory_slot *memslot,
+			      phys_addr_t fault_ipa, unsigned long hva,
+			      bool prefault);
 int kvm_unmap_hva_range(struct kvm *kvm,
 			unsigned long start, unsigned long end);
 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index e462e0368fd9..95aaabb2b1fc 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1656,12 +1656,12 @@ static bool fault_supports_stage2_huge_mapping(struct kvm_memory_slot *memslot,
 	       (hva & ~(map_size - 1)) + map_size <= uaddr_end;
 }
 
-static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
-			  struct kvm_memory_slot *memslot, unsigned long hva,
-			  unsigned long fault_status)
+int kvm_handle_user_mem_abort(struct kvm_vcpu *vcpu, unsigned int esr,
+			      struct kvm_memory_slot *memslot,
+			      phys_addr_t fault_ipa, unsigned long hva,
+			      bool prefault)
 {
-	int ret;
-	u32 esr = kvm_vcpu_get_esr(vcpu);
+	unsigned int fault_status = kvm_vcpu_trap_get_fault_type(esr);
 	bool write_fault, writable, force_pte = false;
 	bool exec_fault, needs_exec;
 	unsigned long mmu_seq;
@@ -1674,6 +1674,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 	pgprot_t mem_type = PAGE_S2;
 	bool logging_active = memslot_is_logging(memslot);
 	unsigned long vma_pagesize, flags = 0;
+	int ret;
 
 	write_fault = kvm_is_write_fault(esr);
 	exec_fault = kvm_vcpu_trap_is_iabt(esr);
@@ -1995,7 +1996,8 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
 		goto out_unlock;
 	}
 
-	ret = user_mem_abort(vcpu, fault_ipa, memslot, hva, fault_status);
+	ret = kvm_handle_user_mem_abort(vcpu, esr, memslot,
+					fault_ipa, hva, false);
 	if (ret == 0)
 		ret = 1;
 out:
-- 
2.23.0