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Commit f7a6509f authored by David Hildenbrand's avatar David Hildenbrand Committed by Christian Borntraeger
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KVM: s390: vsie: use common code functions for pinning 



We will not see -ENOMEM (gfn_to_hva() will return KVM_ERR_PTR_BAD_PAGE
for all errors). So we can also get rid of special handling in the
callers of pin_guest_page() and always assume that it is a g2 error.

As also kvm_s390_inject_program_int() should never fail, we can
simplify pin_scb(), too.

Signed-off-by: default avatarDavid Hildenbrand <david@redhat.com>
Message-Id: <20170901151143.22714-1-david@redhat.com>
Acked-by: default avatarCornelia Huck <cohuck@redhat.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent ba850a8e

arch/s390/kvm/vsie.c

+18 −32
Original line number Diff line number Diff line
@@ -443,22 +443,14 @@ static int map_prefix(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 
 *

 * Returns: - 0 on success

 *          - -EINVAL if the gpa is not valid guest storage

 *          - -ENOMEM if out of memory

 */

static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa)

{

	struct page *page;

	hva_t hva;

	int rc;



	hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));

	if (kvm_is_error_hva(hva))

	page = gfn_to_page(kvm, gpa_to_gfn(gpa));

	if (is_error_page(page))

		return -EINVAL;

	rc = get_user_pages_fast(hva, 1, 1, &page);

	if (rc < 0)

		return rc;

	else if (rc != 1)

		return -ENOMEM;

	*hpa = (hpa_t) page_to_virt(page) + (gpa & ~PAGE_MASK);

	return 0;

}
@@ -466,11 +458,7 @@ static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa) 
/* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */

static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa)

{

	struct page *page;



	page = virt_to_page(hpa);

	set_page_dirty_lock(page);

	put_page(page);

	kvm_release_pfn_dirty(hpa >> PAGE_SHIFT);

	/* mark the page always as dirty for migration */

	mark_page_dirty(kvm, gpa_to_gfn(gpa));

}
@@ -557,7 +545,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 
			rc = set_validity_icpt(scb_s, 0x003bU);

		if (!rc) {

			rc = pin_guest_page(vcpu->kvm, gpa, &hpa);

			if (rc == -EINVAL)

			if (rc)

				rc = set_validity_icpt(scb_s, 0x0034U);

		}

		if (rc)
@@ -574,10 +562,10 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 
		}

		/* 256 bytes cannot cross page boundaries */

		rc = pin_guest_page(vcpu->kvm, gpa, &hpa);

		if (rc == -EINVAL)

		if (rc) {

			rc = set_validity_icpt(scb_s, 0x0080U);

		if (rc)

			goto unpin;

		}

		scb_s->itdba = hpa;

	}
@@ -592,10 +580,10 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 
		 * if this block gets bigger, we have to shadow it.

		 */

		rc = pin_guest_page(vcpu->kvm, gpa, &hpa);

		if (rc == -EINVAL)

		if (rc) {

			rc = set_validity_icpt(scb_s, 0x1310U);

		if (rc)

			goto unpin;

		}

		scb_s->gvrd = hpa;

	}
@@ -607,11 +595,11 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 
		}

		/* 64 bytes cannot cross page boundaries */

		rc = pin_guest_page(vcpu->kvm, gpa, &hpa);

		if (rc == -EINVAL)

		if (rc) {

			rc = set_validity_icpt(scb_s, 0x0043U);

		/* Validity 0x0044 will be checked by SIE */

		if (rc)

			goto unpin;

		}

		/* Validity 0x0044 will be checked by SIE */

		scb_s->riccbd = hpa;

	}

	if ((scb_s->ecb & ECB_GS) && !(scb_s->ecd & ECD_HOSTREGMGMT)) {
@@ -635,10 +623,10 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 
		 * cross page boundaries

		 */

		rc = pin_guest_page(vcpu->kvm, gpa, &hpa);

		if (rc == -EINVAL)

		if (rc) {

			rc = set_validity_icpt(scb_s, 0x10b0U);

		if (rc)

			goto unpin;

		}

		scb_s->sdnxo = hpa | sdnxc;

	}

	return 0;
@@ -663,7 +651,6 @@ static void unpin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, 
 *

 * Returns: - 0 if the scb was pinned.

 *          - > 0 if control has to be given to guest 2

 *          - -ENOMEM if out of memory

 */

static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page,

		   gpa_t gpa)
@@ -672,14 +659,13 @@ static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, 
	int rc;



	rc = pin_guest_page(vcpu->kvm, gpa, &hpa);

	if (rc == -EINVAL) {

	if (rc) {

		rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);

		if (!rc)

			rc = 1;

		WARN_ON_ONCE(rc);

		return 1;

	}

	if (!rc)

	vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa;

	return rc;

	return 0;

}



/*

include/linux/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -667,6 +667,7 @@ kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, 
			       bool *writable);



void kvm_release_pfn_clean(kvm_pfn_t pfn);

void kvm_release_pfn_dirty(kvm_pfn_t pfn);

void kvm_set_pfn_dirty(kvm_pfn_t pfn);

void kvm_set_pfn_accessed(kvm_pfn_t pfn);

void kvm_get_pfn(kvm_pfn_t pfn);

virt/kvm/kvm_main.c

+2 −2
Original line number Diff line number Diff line
@@ -122,7 +122,6 @@ static void hardware_disable_all(void); 


static void kvm_io_bus_destroy(struct kvm_io_bus *bus);



static void kvm_release_pfn_dirty(kvm_pfn_t pfn);

static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);



__visible bool kvm_rebooting;
@@ -1679,11 +1678,12 @@ void kvm_release_page_dirty(struct page *page) 
}

EXPORT_SYMBOL_GPL(kvm_release_page_dirty);



static void kvm_release_pfn_dirty(kvm_pfn_t pfn)

void kvm_release_pfn_dirty(kvm_pfn_t pfn)

{

	kvm_set_pfn_dirty(pfn);

	kvm_release_pfn_clean(pfn);

}

EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);



void kvm_set_pfn_dirty(kvm_pfn_t pfn)

{