From: Sean Christopherson <seanjc@google.com>
Date: Thu, 10 Oct 2024 18:23:54 +0000 (-0700)
Subject: KVM: PPC: e500: Mark "struct page" dirty in kvmppc_e500_shadow_map()
X-Git-Tag: v6.13-rc1~97^2~17^2~33
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c9be85dabb376299504e0d391d15662c0edf8273;p=thirdparty%2Fkernel%2Flinux.git

KVM: PPC: e500: Mark "struct page" dirty in kvmppc_e500_shadow_map()

Mark the underlying page as dirty in kvmppc_e500_ref_setup()'s sole
caller, kvmppc_e500_shadow_map(), which will allow converting e500 to
__kvm_faultin_pfn() + kvm_release_faultin_page() without having to do
a weird dance between ref_setup() and shadow_map().

Opportunistically drop the redundant kvm_set_pfn_accessed(), as
shadow_map() puts the page via kvm_release_pfn_clean().

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: <20241010182427.1434605-53-seanjc@google.com>
---

diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
index c664fdec75b1a..5c2adfd19e123 100644
--- a/arch/powerpc/kvm/e500_mmu_host.c
+++ b/arch/powerpc/kvm/e500_mmu_host.c
@@ -242,7 +242,7 @@ static inline int tlbe_is_writable(struct kvm_book3e_206_tlb_entry *tlbe)
 	return tlbe->mas7_3 & (MAS3_SW|MAS3_UW);
 }
 
-static inline void kvmppc_e500_ref_setup(struct tlbe_ref *ref,
+static inline bool kvmppc_e500_ref_setup(struct tlbe_ref *ref,
 					 struct kvm_book3e_206_tlb_entry *gtlbe,
 					 kvm_pfn_t pfn, unsigned int wimg)
 {
@@ -252,11 +252,7 @@ static inline void kvmppc_e500_ref_setup(struct tlbe_ref *ref,
 	/* Use guest supplied MAS2_G and MAS2_E */
 	ref->flags |= (gtlbe->mas2 & MAS2_ATTRIB_MASK) | wimg;
 
-	/* Mark the page accessed */
-	kvm_set_pfn_accessed(pfn);
-
-	if (tlbe_is_writable(gtlbe))
-		kvm_set_pfn_dirty(pfn);
+	return tlbe_is_writable(gtlbe);
 }
 
 static inline void kvmppc_e500_ref_release(struct tlbe_ref *ref)
@@ -337,6 +333,7 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 	unsigned int wimg = 0;
 	pgd_t *pgdir;
 	unsigned long flags;
+	bool writable = false;
 
 	/* used to check for invalidations in progress */
 	mmu_seq = kvm->mmu_invalidate_seq;
@@ -490,7 +487,9 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 			goto out;
 		}
 	}
-	kvmppc_e500_ref_setup(ref, gtlbe, pfn, wimg);
+	writable = kvmppc_e500_ref_setup(ref, gtlbe, pfn, wimg);
+	if (writable)
+		kvm_set_pfn_dirty(pfn);
 
 	kvmppc_e500_setup_stlbe(&vcpu_e500->vcpu, gtlbe, tsize,
 				ref, gvaddr, stlbe);