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authorChristian Borntraeger <borntraeger@de.ibm.com>2011-07-24 10:48:17 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-07-24 10:48:20 +0200
commitbb25b9ba3e33e941dc48048d0a784e6a05e5648a (patch)
tree687caacfbe9165dd80d2e29af4b68ce32216e28d /arch/s390/kvm
parentb02f0c2ea25781e0f94b4fc8f6f85582057857b3 (diff)
[S390] kvm: handle tprot intercepts
When running a kvm guest we can get intercepts for tprot, if the host page table is read-only or not populated. This patch implements the most common case (linux memory detection). This also allows host copy on write for guest memory on newer systems. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm')
-rw-r--r--arch/s390/kvm/intercept.c1
-rw-r--r--arch/s390/kvm/kvm-s390.c1
-rw-r--r--arch/s390/kvm/kvm-s390.h1
-rw-r--r--arch/s390/kvm/priv.c49
4 files changed, 52 insertions, 0 deletions
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index f7b6df45d8be..b5312050b224 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -105,6 +105,7 @@ static intercept_handler_t instruction_handlers[256] = {
[0xae] = kvm_s390_handle_sigp,
[0xb2] = kvm_s390_handle_b2,
[0xb7] = handle_lctl,
+ [0xe5] = kvm_s390_handle_e5,
[0xeb] = handle_lctlg,
};
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 67345ae7ce8d..123ebea72282 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -62,6 +62,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "instruction_chsc", VCPU_STAT(instruction_chsc) },
{ "instruction_stsi", VCPU_STAT(instruction_stsi) },
{ "instruction_stfl", VCPU_STAT(instruction_stfl) },
+ { "instruction_tprot", VCPU_STAT(instruction_tprot) },
{ "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
{ "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
{ "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index a7b7586626db..65e2201a555b 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -87,6 +87,7 @@ static inline void kvm_s390_vcpu_set_mem(struct kvm_vcpu *vcpu)
/* implemented in priv.c */
int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
+int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
/* implemented in sigp.c */
int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 73c47bd95db3..391626361084 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -326,3 +326,52 @@ int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
}
return -EOPNOTSUPP;
}
+
+static int handle_tprot(struct kvm_vcpu *vcpu)
+{
+ int base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
+ int disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
+ int base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
+ int disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
+ u64 address1 = disp1 + base1 ? vcpu->arch.guest_gprs[base1] : 0;
+ u64 address2 = disp2 + base2 ? vcpu->arch.guest_gprs[base2] : 0;
+ struct vm_area_struct *vma;
+
+ vcpu->stat.instruction_tprot++;
+
+ /* we only handle the Linux memory detection case:
+ * access key == 0
+ * guest DAT == off
+ * everything else goes to userspace. */
+ if (address2 & 0xf0)
+ return -EOPNOTSUPP;
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
+ return -EOPNOTSUPP;
+
+
+ down_read(&current->mm->mmap_sem);
+ vma = find_vma(current->mm,
+ (unsigned long) __guestaddr_to_user(vcpu, address1));
+ if (!vma) {
+ up_read(&current->mm->mmap_sem);
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ }
+
+ vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
+ if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ))
+ vcpu->arch.sie_block->gpsw.mask |= (1ul << 44);
+ if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ))
+ vcpu->arch.sie_block->gpsw.mask |= (2ul << 44);
+
+ up_read(&current->mm->mmap_sem);
+ return 0;
+}
+
+int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
+{
+ /* For e5xx... instructions we only handle TPROT */
+ if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
+ return handle_tprot(vcpu);
+ return -EOPNOTSUPP;
+}
+