Patch "KVM: PPC: e500: Mark "struct page" dirty in kvmppc_e500_shadow_map()" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

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

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kvm-ppc-e500-mark-struct-page-dirty-in-kvmppc_e500_s.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 22d64c57795ad335cb6ab47494ffb1bf08c8fbcf
Author: Sean Christopherson <seanjc@xxxxxxxxxx>
Date:   Thu Oct 10 11:23:54 2024 -0700

    KVM: PPC: e500: Mark "struct page" dirty in kvmppc_e500_shadow_map()
    
    [ Upstream commit c9be85dabb376299504e0d391d15662c0edf8273 ]
    
    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@xxxxxxxxxx>
    Tested-by: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>
    Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
    Message-ID: <20241010182427.1434605-53-seanjc@xxxxxxxxxx>
    Stable-dep-of: 87ecfdbc699c ("KVM: e500: always restore irqs")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
index 7f16afc331efd..738556b7f175c 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_notifier_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);