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| author |   Thomas Huth <thuth@linux.vnet.ibm.com> | 2014-05-07 11:44:17 +0200 |
|---|---|---|
| committer |   Christian Borntraeger <borntraeger@de.ibm.com> | 2014-05-16 14:57:22 +0200 |
| commit | f22166dcfd30b46bb729abaf7ba3e1dd9e5d2093 (patch) | |
| tree | 812186c91b28c2e8aa25b3d953dab5789d46b7ae /arch/s390/kvm/intercept.c | |
| parent | KVM: s390: Introduce helper function for faulting-in a guest page (diff) | |
| download | linux-dev-f22166dcfd30b46bb729abaf7ba3e1dd9e5d2093.tar.xz linux-dev-f22166dcfd30b46bb729abaf7ba3e1dd9e5d2093.zip | |
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.c | 25 |
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, ®1, ®2); - 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); |