[PATCH v13 68/85] KVM: LoongArch: Use kvm_faultin_pfn() to map pfns into the guest
From: Sean Christopherson <seanjc@google.com>
Date: 2024-10-10 18:27:16
Also in:
kvm, kvm-riscv, kvmarm, linux-mips, linux-riscv, linuxppc-dev, lkml, loongarch
Subsystem:
kernel virtual machine for loongarch (kvm/loongarch), loongarch, the rest · Maintainers:
Tianrui Zhao, Bibo Mao, Huacai Chen, Linus Torvalds
Convert LoongArch to kvm_faultin_pfn()+kvm_release_faultin_page(), which are new APIs to consolidate arch code and provide consistent behavior across all KVM architectures. Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/loongarch/kvm/mmu.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/arch/loongarch/kvm/mmu.c b/arch/loongarch/kvm/mmu.c
index 7066cafcce64..4d203294767c 100644
--- a/arch/loongarch/kvm/mmu.c
+++ b/arch/loongarch/kvm/mmu.c@@ -780,6 +780,7 @@ static int kvm_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, bool write) struct kvm *kvm = vcpu->kvm; struct kvm_memory_slot *memslot; struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache; + struct page *page; /* Try the fast path to handle old / clean pages */ srcu_idx = srcu_read_lock(&kvm->srcu);
@@ -807,7 +808,7 @@ static int kvm_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, bool write) mmu_seq = kvm->mmu_invalidate_seq; /* * Ensure the read of mmu_invalidate_seq isn't reordered with PTE reads in - * gfn_to_pfn_prot() (which calls get_user_pages()), so that we don't + * kvm_faultin_pfn() (which calls get_user_pages()), so that we don't * risk the page we get a reference to getting unmapped before we have a * chance to grab the mmu_lock without mmu_invalidate_retry() noticing. *
@@ -819,7 +820,7 @@ static int kvm_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, bool write) smp_rmb(); /* Slow path - ask KVM core whether we can access this GPA */ - pfn = gfn_to_pfn_prot(kvm, gfn, write, &writeable); + pfn = kvm_faultin_pfn(vcpu, gfn, write, &writeable, &page); if (is_error_noslot_pfn(pfn)) { err = -EFAULT; goto out;
@@ -831,10 +832,10 @@ static int kvm_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, bool write) /* * This can happen when mappings are changed asynchronously, but * also synchronously if a COW is triggered by - * gfn_to_pfn_prot(). + * kvm_faultin_pfn(). */ spin_unlock(&kvm->mmu_lock); - kvm_release_pfn_clean(pfn); + kvm_release_page_unused(page); if (retry_no > 100) { retry_no = 0; schedule();
@@ -900,10 +901,7 @@ static int kvm_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, bool write) ++kvm->stat.pages; kvm_set_pte(ptep, new_pte); - if (writeable) - kvm_set_pfn_dirty(pfn); - kvm_release_pfn_clean(pfn); - + kvm_release_faultin_page(kvm, page, false, writeable); spin_unlock(&kvm->mmu_lock); if (prot_bits & _PAGE_DIRTY)
--
2.47.0.rc1.288.g06298d1525-goog