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KVM: PPC: e500: Mark "struct page" pfn accessed before dropping mmu_lock

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[ Upstream commit 84cf78dcd9d65c45ab73998d4ad50f433d53fb93 ]

Mark pages accessed before dropping mmu_lock when faulting in guest memory
so that shadow_map() can convert to kvm_release_faultin_page() without
tripping its lockdep assertion on mmu_lock being held.  Marking pages
accessed outside of mmu_lock is ok (not great, but safe), but marking
pages _dirty_ outside of mmu_lock can make filesystems unhappy.

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: <20241010182427.1434605-54-seanjc@google.com>
Stable-dep-of: 87ecfdbc699c ("KVM: e500: always restore irqs")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sean Christopherson
2024-10-10 11:23:55 -07:00
committed by Greg Kroah-Hartman
parent 8b92e9cc04
commit d2004572fc
1 changed files with 1 additions and 3 deletions
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4
arch/powerpc/kvm/e500_mmu_host.c
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@@ -498,11 +498,9 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
kvmppc_mmu_flush_icache(pfn);
out:
spin_unlock(&kvm->mmu_lock);
/* Drop refcount on page, so that mmu notifiers can clear it */
kvm_release_pfn_clean(pfn);
spin_unlock(&kvm->mmu_lock);
return ret;
}