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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: David Hildenbrand <david@redhat.com>
Message-Id: <20170901151143.22714-1-david@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2017-09-01 17:11:43 +02:00 committed by Christian Borntraeger
parent ba850a8e64
commit f7a6509fe0
3 changed files with 21 additions and 34 deletions
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50
arch/s390/kvm/vsie.c
View File

@ -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;
vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa;
return 0;
}
/*

1
include/linux/kvm_host.h
View File

@ -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);

4
virt/kvm/kvm_main.c
View File

@ -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)
{