[PATCH v13 52/85] KVM: PPC: e500: Mark "struct page" dirty in kvmppc_e500_shadow_map()

Sean Christopherson
2024-10-10T18:26:44Z

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>
---
arch/powerpc/kvm/e500_mmu_host.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
index c664fdec75b1..5c2adfd19e12 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);
--
2.47.0.rc1.288.g06298d1525-goog