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KVM: mmu: Separate updating a PTE from kvm_set_pte_rmapp

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The TDP MMU's own function for the changed-PTE notifier will need to be
update a PTE in the exact same way as the shadow MMU.  Rather than
re-implementing this logic, factor the SPTE creation out of kvm_set_pte_rmapp.

Extracted out of a patch by Ben Gardon. <bgardon@google.com>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2020-09-28 10:17:17 -04:00
parent 799a4190e7
commit cb3eedab45
1 changed files with 17 additions and 7 deletions
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24
arch/x86/kvm/mmu/mmu.c
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@ -1747,6 +1747,21 @@ static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
return kvm_zap_rmapp(kvm, rmap_head);
}
static u64 kvm_mmu_changed_pte_notifier_make_spte(u64 old_spte, kvm_pfn_t new_pfn)
{
u64 new_spte;
new_spte = old_spte & ~PT64_BASE_ADDR_MASK;
new_spte |= (u64)new_pfn << PAGE_SHIFT;
new_spte &= ~PT_WRITABLE_MASK;
new_spte &= ~SPTE_HOST_WRITEABLE;
new_spte = mark_spte_for_access_track(new_spte);
return new_spte;
}
static int kvm_set_pte_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
struct kvm_memory_slot *slot, gfn_t gfn, int level,
unsigned long data)
@ -1772,13 +1787,8 @@ restart:
pte_list_remove(rmap_head, sptep);
goto restart;
} else {
new_spte = *sptep & ~PT64_BASE_ADDR_MASK;
new_spte |= (u64)new_pfn << PAGE_SHIFT;
new_spte &= ~PT_WRITABLE_MASK;
new_spte &= ~SPTE_HOST_WRITEABLE;
new_spte = mark_spte_for_access_track(new_spte);
new_spte = kvm_mmu_changed_pte_notifier_make_spte(
*sptep, new_pfn);
mmu_spte_clear_track_bits(sptep);
mmu_spte_set(sptep, new_spte);