linux-kernel - [PATCH v12 58/84] KVM: RISC-V: Use kvm_faultin

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Message-ID: <20240726235234.228822-59-seanjc@google.com>
Date: Fri, 26 Jul 2024 16:52:07 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, Tianrui Zhao <zhaotianrui@...ngson.cn>, 
	Bibo Mao <maobibo@...ngson.cn>, Huacai Chen <chenhuacai@...nel.org>, 
	Michael Ellerman <mpe@...erman.id.au>, Anup Patel <anup@...infault.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Christian Borntraeger <borntraeger@...ux.ibm.com>, 
	Janosch Frank <frankja@...ux.ibm.com>, Claudio Imbrenda <imbrenda@...ux.ibm.com>, 
	Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, loongarch@...ts.linux.dev, linux-mips@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	David Matlack <dmatlack@...gle.com>, David Stevens <stevensd@...omium.org>
Subject: [PATCH v12 58/84] KVM: RISC-V: Use kvm_faultin_pfn() when mapping
 pfns into the guest

Convert RISC-V 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@...gle.com>
---
 arch/riscv/kvm/mmu.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index 806f68e70642..f73d6a79a78c 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -601,6 +601,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
 	bool logging = (memslot->dirty_bitmap &&
 			!(memslot->flags & KVM_MEM_READONLY)) ? true : false;
 	unsigned long vma_pagesize, mmu_seq;
+	struct page *page;
 
 	/* We need minimum second+third level pages */
 	ret = kvm_mmu_topup_memory_cache(pcache, gstage_pgd_levels);
@@ -631,7 +632,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
 
 	/*
 	 * Read mmu_invalidate_seq so that KVM can detect if the results of
-	 * vma_lookup() or gfn_to_pfn_prot() become stale priort to acquiring
+	 * vma_lookup() or __kvm_faultin_pfn() become stale priort to acquiring
 	 * kvm->mmu_lock.
 	 *
 	 * Rely on mmap_read_unlock() for an implicit smp_rmb(), which pairs
@@ -647,7 +648,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
 		return -EFAULT;
 	}
 
-	hfn = gfn_to_pfn_prot(kvm, gfn, is_write, &writable);
+	hfn = kvm_faultin_pfn(vcpu, gfn, is_write, &writable, &page);
 	if (hfn == KVM_PFN_ERR_HWPOISON) {
 		send_sig_mceerr(BUS_MCEERR_AR, (void __user *)hva,
 				vma_pageshift, current);
@@ -681,11 +682,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
 		kvm_err("Failed to map in G-stage\n");
 
 out_unlock:
-	if ((!ret || ret == -EEXIST) && writable)
-		kvm_set_pfn_dirty(hfn);
-	else
-		kvm_release_pfn_clean(hfn);
-
+	kvm_release_faultin_page(kvm, page, ret && ret != -EEXIST, writable);
 	spin_unlock(&kvm->mmu_lock);
 	return ret;
 }
-- 
2.46.0.rc1.232.g9752f9e123-goog