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KVM: RISC-V: Mark "struct page" pfns dirty iff a stage-2 PTE is installed

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Don't mark pages dirty if KVM bails from the page fault handler without
installing a stage-2 mapping, i.e. if the page is guaranteed to not be
written by the guest.

In addition to being a (very) minor fix, this paves the way for converting
RISC-V to use kvm_release_faultin_page().

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Acked-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-58-seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-10-10 11:23:59 -07:00 committed by Paolo Bonzini
parent 85c7869e30
commit 9b3639bb02
1 changed files with 3 additions and 1 deletions
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4
arch/riscv/kvm/mmu.c
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@ -669,7 +669,6 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
goto out_unlock;
if (writable) {
kvm_set_pfn_dirty(hfn);
mark_page_dirty(kvm, gfn);
ret = gstage_map_page(kvm, pcache, gpa, hfn << PAGE_SHIFT,
vma_pagesize, false, true);
@ -682,6 +681,9 @@ 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);
spin_unlock(&kvm->mmu_lock);
kvm_set_pfn_accessed(hfn);
kvm_release_pfn_clean(hfn);