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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2008-07-25 17:53:12 +0400 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-07-27 12:36:20 +0400 |
| commit | 5a00a5e7a3e013b2323f87c1b69ff9557eae5ec9 (patch) | |
| tree | 1895de31abc875c5b7d818e9d900a92b6aa507bb /arch/s390/kvm | |
| parent | f5e10b09a5f8fc40666c95fe0cd6bcc2b8f11437 (diff) | |
| download | linux-5a00a5e7a3e013b2323f87c1b69ff9557eae5ec9.tar.xz | |
KVM: s390: Fix possible host kernel bug on lctl(g) handling
The lctl(g) instructions require a specific alignment for the parameters.
The architecture requires a specification program check if these alignments
are not used. Enforcing this alignment also removes a possible host BUG,
since the get_guest functions check for proper alignment and emits a BUG.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/s390/kvm')
| -rw-r--r-- | arch/s390/kvm/intercept.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c index f94da68a5c22..61236102203e 100644 --- a/arch/s390/kvm/intercept.c +++ b/arch/s390/kvm/intercept.c @@ -38,6 +38,9 @@ static int handle_lctlg(struct kvm_vcpu *vcpu) if (base2) useraddr += vcpu->arch.guest_gprs[base2]; + if (useraddr & 7) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + reg = reg1; VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2, @@ -74,6 +77,9 @@ static int handle_lctl(struct kvm_vcpu *vcpu) if (base2) useraddr += vcpu->arch.guest_gprs[base2]; + if (useraddr & 3) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x,b2:%x,d2:%x", reg1, reg3, base2, disp2); |