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Commit 1e73f9dd authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Avi Kivity
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KVM: MMU: split mmu_set_spte 



Split the spte entry creation code into a new set_spte function.

Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 93a423e7

arch/x86/kvm/mmu.c

+57 −44
Original line number Diff line number Diff line
@@ -1148,44 +1148,13 @@ struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva) 
	return page;

}



static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,

			 unsigned pt_access, unsigned pte_access,

			 int user_fault, int write_fault, int dirty,

			 int *ptwrite, int largepage, gfn_t gfn,

			 pfn_t pfn, bool speculative)

static int set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,

		    unsigned pte_access, int user_fault,

		    int write_fault, int dirty, int largepage,

		    gfn_t gfn, pfn_t pfn, bool speculative)

{

	u64 spte;

	int was_rmapped = 0;

	int was_writeble = is_writeble_pte(*shadow_pte);



	pgprintk("%s: spte %llx access %x write_fault %d"

		 " user_fault %d gfn %lx\n",

		 __func__, *shadow_pte, pt_access,

		 write_fault, user_fault, gfn);



	if (is_rmap_pte(*shadow_pte)) {

		/*

		 * If we overwrite a PTE page pointer with a 2MB PMD, unlink

		 * the parent of the now unreachable PTE.

		 */

		if (largepage && !is_large_pte(*shadow_pte)) {

			struct kvm_mmu_page *child;

			u64 pte = *shadow_pte;



			child = page_header(pte & PT64_BASE_ADDR_MASK);

			mmu_page_remove_parent_pte(child, shadow_pte);

		} else if (pfn != spte_to_pfn(*shadow_pte)) {

			pgprintk("hfn old %lx new %lx\n",

				 spte_to_pfn(*shadow_pte), pfn);

			rmap_remove(vcpu->kvm, shadow_pte);

		} else {

			if (largepage)

				was_rmapped = is_large_pte(*shadow_pte);

			else

				was_rmapped = 1;

		}

	}



	int ret = 0;

	/*

	 * We don't set the accessed bit, since we sometimes want to see

	 * whether the guest actually used the pte (in order to detect
@@ -1218,26 +1187,70 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte, 
		   (largepage && has_wrprotected_page(vcpu->kvm, gfn))) {

			pgprintk("%s: found shadow page for %lx, marking ro\n",

				 __func__, gfn);

			ret = 1;

			pte_access &= ~ACC_WRITE_MASK;

			if (is_writeble_pte(spte)) {

				spte &= ~PT_WRITABLE_MASK;

				kvm_x86_ops->tlb_flush(vcpu);

			}

			if (write_fault)

				*ptwrite = 1;

		}

	}



	if (pte_access & ACC_WRITE_MASK)

		mark_page_dirty(vcpu->kvm, gfn);



	pgprintk("%s: setting spte %llx\n", __func__, spte);

	pgprintk("instantiating %s PTE (%s) at %ld (%llx) addr %p\n",

		 (spte&PT_PAGE_SIZE_MASK)? "2MB" : "4kB",

		 (spte&PT_WRITABLE_MASK)?"RW":"R", gfn, spte, shadow_pte);

	set_shadow_pte(shadow_pte, spte);

	if (!was_rmapped && (spte & PT_PAGE_SIZE_MASK)

	    && (spte & PT_PRESENT_MASK))

	return ret;

}





static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,

			 unsigned pt_access, unsigned pte_access,

			 int user_fault, int write_fault, int dirty,

			 int *ptwrite, int largepage, gfn_t gfn,

			 pfn_t pfn, bool speculative)

{

	int was_rmapped = 0;

	int was_writeble = is_writeble_pte(*shadow_pte);



	pgprintk("%s: spte %llx access %x write_fault %d"

		 " user_fault %d gfn %lx\n",

		 __func__, *shadow_pte, pt_access,

		 write_fault, user_fault, gfn);



	if (is_rmap_pte(*shadow_pte)) {

		/*

		 * If we overwrite a PTE page pointer with a 2MB PMD, unlink

		 * the parent of the now unreachable PTE.

		 */

		if (largepage && !is_large_pte(*shadow_pte)) {

			struct kvm_mmu_page *child;

			u64 pte = *shadow_pte;



			child = page_header(pte & PT64_BASE_ADDR_MASK);

			mmu_page_remove_parent_pte(child, shadow_pte);

		} else if (pfn != spte_to_pfn(*shadow_pte)) {

			pgprintk("hfn old %lx new %lx\n",

				 spte_to_pfn(*shadow_pte), pfn);

			rmap_remove(vcpu->kvm, shadow_pte);

		} else {

			if (largepage)

				was_rmapped = is_large_pte(*shadow_pte);

			else

				was_rmapped = 1;

		}

	}

	if (set_spte(vcpu, shadow_pte, pte_access, user_fault, write_fault,

		      dirty, largepage, gfn, pfn, speculative))

		if (write_fault)

			*ptwrite = 1;



	pgprintk("%s: setting spte %llx\n", __func__, *shadow_pte);

	pgprintk("instantiating %s PTE (%s) at %ld (%llx) addr %p\n",

		 is_large_pte(*shadow_pte)? "2MB" : "4kB",

		 is_present_pte(*shadow_pte)?"RW":"R", gfn,

		 *shadow_pte, shadow_pte);

	if (!was_rmapped && is_large_pte(*shadow_pte))

		++vcpu->kvm->stat.lpages;



	page_header_update_slot(vcpu->kvm, shadow_pte, gfn);