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authorThomas Huth <thuth@linux.vnet.ibm.com>2014-05-07 13:44:17 +0400
committerChristian Borntraeger <borntraeger@de.ibm.com>2014-05-16 16:57:22 +0400
commitf22166dcfd30b46bb729abaf7ba3e1dd9e5d2093 (patch)
tree812186c91b28c2e8aa25b3d953dab5789d46b7ae /arch/s390/kvm/intercept.c
parentfa576c583d877d667d9acaed909a3dfc6b03e138 (diff)
downloadlinux-f22166dcfd30b46bb729abaf7ba3e1dd9e5d2093.tar.xz
KVM: s390: Improved MVPG partial execution handler
Use the new helper function kvm_arch_fault_in_page() for faulting-in the guest pages and only inject addressing errors when we've really hit a bad address (and return other error codes to userspace instead). Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/intercept.c')
-rw-r--r--arch/s390/kvm/intercept.c25
1 files changed, 9 insertions, 16 deletions
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index ddc69f5f5e19..147b87fefecd 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -292,33 +292,26 @@ static int handle_external_interrupt(struct kvm_vcpu *vcpu)
*/
static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
{
- unsigned long hostaddr, srcaddr, dstaddr;
psw_t *psw = &vcpu->arch.sie_block->gpsw;
- struct mm_struct *mm = current->mm;
+ unsigned long srcaddr, dstaddr;
int reg1, reg2, rc;
kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
- srcaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg2]);
- dstaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg1]);
/* Make sure that the source is paged-in */
- hostaddr = gmap_fault(srcaddr, vcpu->arch.gmap);
- if (IS_ERR_VALUE(hostaddr))
+ srcaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg2]);
+ if (kvm_is_error_gpa(vcpu->kvm, srcaddr))
return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- down_read(&mm->mmap_sem);
- rc = get_user_pages(current, mm, hostaddr, 1, 0, 0, NULL, NULL);
- up_read(&mm->mmap_sem);
- if (rc < 0)
+ rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
+ if (rc != 0)
return rc;
/* Make sure that the destination is paged-in */
- hostaddr = gmap_fault(dstaddr, vcpu->arch.gmap);
- if (IS_ERR_VALUE(hostaddr))
+ dstaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg1]);
+ if (kvm_is_error_gpa(vcpu->kvm, dstaddr))
return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
- down_read(&mm->mmap_sem);
- rc = get_user_pages(current, mm, hostaddr, 1, 1, 0, NULL, NULL);
- up_read(&mm->mmap_sem);
- if (rc < 0)
+ rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
+ if (rc != 0)
return rc;
psw->addr = __rewind_psw(*psw, 4);