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Commit 0d536790 authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Paolo Bonzini
Browse files

KVM: MMU: introduce for_each_rmap_spte() 



It's used to walk all the sptes on the rmap to clean up the
code

Signed-off-by: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent c35ebbea

arch/x86/kvm/mmu.c

+18 −35
Original line number Diff line number Diff line
@@ -1142,6 +1142,11 @@ static u64 *rmap_get_next(struct rmap_iterator *iter) 
	return NULL;

}



#define for_each_rmap_spte(_rmap_, _iter_, _spte_)			    \

	   for (_spte_ = rmap_get_first(*_rmap_, _iter_);		    \

		_spte_ && ({BUG_ON(!is_shadow_present_pte(*_spte_)); 1;});  \

			_spte_ = rmap_get_next(_iter_))



static void drop_spte(struct kvm *kvm, u64 *sptep)

{

	if (mmu_spte_clear_track_bits(sptep))
@@ -1205,12 +1210,8 @@ static bool __rmap_write_protect(struct kvm *kvm, unsigned long *rmapp, 
	struct rmap_iterator iter;

	bool flush = false;



	for (sptep = rmap_get_first(*rmapp, &iter); sptep;) {

		BUG_ON(!(*sptep & PT_PRESENT_MASK));



	for_each_rmap_spte(rmapp, &iter, sptep)

		flush |= spte_write_protect(kvm, sptep, pt_protect);

		sptep = rmap_get_next(&iter);

	}



	return flush;

}
@@ -1232,12 +1233,8 @@ static bool __rmap_clear_dirty(struct kvm *kvm, unsigned long *rmapp) 
	struct rmap_iterator iter;

	bool flush = false;



	for (sptep = rmap_get_first(*rmapp, &iter); sptep;) {

		BUG_ON(!(*sptep & PT_PRESENT_MASK));



	for_each_rmap_spte(rmapp, &iter, sptep)

		flush |= spte_clear_dirty(kvm, sptep);

		sptep = rmap_get_next(&iter);

	}



	return flush;

}
@@ -1259,12 +1256,8 @@ static bool __rmap_set_dirty(struct kvm *kvm, unsigned long *rmapp) 
	struct rmap_iterator iter;

	bool flush = false;



	for (sptep = rmap_get_first(*rmapp, &iter); sptep;) {

		BUG_ON(!(*sptep & PT_PRESENT_MASK));



	for_each_rmap_spte(rmapp, &iter, sptep)

		flush |= spte_set_dirty(kvm, sptep);

		sptep = rmap_get_next(&iter);

	}



	return flush;

}
@@ -1394,8 +1387,8 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, 
	WARN_ON(pte_huge(*ptep));

	new_pfn = pte_pfn(*ptep);



	for (sptep = rmap_get_first(*rmapp, &iter); sptep;) {

		BUG_ON(!is_shadow_present_pte(*sptep));

restart:

	for_each_rmap_spte(rmapp, &iter, sptep) {

		rmap_printk("kvm_set_pte_rmapp: spte %p %llx gfn %llx (%d)\n",

			     sptep, *sptep, gfn, level);
@@ -1403,7 +1396,7 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, 


		if (pte_write(*ptep)) {

			drop_spte(kvm, sptep);

			sptep = rmap_get_first(*rmapp, &iter);

			goto restart;

		} else {

			new_spte = *sptep & ~PT64_BASE_ADDR_MASK;

			new_spte |= (u64)new_pfn << PAGE_SHIFT;
@@ -1414,7 +1407,6 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, 


			mmu_spte_clear_track_bits(sptep);

			mmu_spte_set(sptep, new_spte);

			sptep = rmap_get_next(&iter);

		}

	}
@@ -1518,16 +1510,13 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, 


	BUG_ON(!shadow_accessed_mask);



	for (sptep = rmap_get_first(*rmapp, &iter); sptep;

	     sptep = rmap_get_next(&iter)) {

		BUG_ON(!is_shadow_present_pte(*sptep));



	for_each_rmap_spte(rmapp, &iter, sptep)

		if (*sptep & shadow_accessed_mask) {

			young = 1;

			clear_bit((ffs(shadow_accessed_mask) - 1),

				 (unsigned long *)sptep);

		}

	}



	trace_kvm_age_page(gfn, level, slot, young);

	return young;

}
@@ -1548,15 +1537,11 @@ static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, 
	if (!shadow_accessed_mask)

		goto out;



	for (sptep = rmap_get_first(*rmapp, &iter); sptep;

	     sptep = rmap_get_next(&iter)) {

		BUG_ON(!is_shadow_present_pte(*sptep));



	for_each_rmap_spte(rmapp, &iter, sptep)

		if (*sptep & shadow_accessed_mask) {

			young = 1;

			break;

		}

	}

out:

	return young;

}
@@ -4482,9 +4467,8 @@ static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm, 
	pfn_t pfn;

	struct kvm_mmu_page *sp;



	for (sptep = rmap_get_first(*rmapp, &iter); sptep;) {

		BUG_ON(!(*sptep & PT_PRESENT_MASK));



restart:

	for_each_rmap_spte(rmapp, &iter, sptep) {

		sp = page_header(__pa(sptep));

		pfn = spte_to_pfn(*sptep);
@@ -4499,10 +4483,9 @@ static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm, 
			!kvm_is_reserved_pfn(pfn) &&

			PageTransCompound(pfn_to_page(pfn))) {

			drop_spte(kvm, sptep);

			sptep = rmap_get_first(*rmapp, &iter);

			need_tlb_flush = 1;

		} else

			sptep = rmap_get_next(&iter);

			goto restart;

		}

	}



	return need_tlb_flush;

arch/x86/kvm/mmu_audit.c

+1 −3
Original line number Diff line number Diff line
@@ -197,14 +197,12 @@ static void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp) 


	rmapp = gfn_to_rmap(kvm, sp->gfn, PT_PAGE_TABLE_LEVEL);



	for (sptep = rmap_get_first(*rmapp, &iter); sptep;

	     sptep = rmap_get_next(&iter)) {

	for_each_rmap_spte(rmapp, &iter, sptep)

		if (is_writable_pte(*sptep))

			audit_printk(kvm, "shadow page has writable "

				     "mappings: gfn %llx role %x\n",

				     sp->gfn, sp->role.word);

}

}



static void audit_sp(struct kvm *kvm, struct kvm_mmu_page *sp)

{