diff options
| author | Dominik Dingel <dingel@linux.vnet.ibm.com> | 2013-07-26 15:04:00 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-14 05:50:48 -0700 |
| commit | 2ccddb4d6101ea65c3f716ca6546c4d82b767bdf (patch) | |
| tree | c785e032a36f32ad7eac50ff33228ba70ed69c8f /arch/s390 | |
| parent | 40318c990ef6005a3c9933253e7b63a4f5e06c3a (diff) | |
| download | kernel_samsung_smdk4412-2ccddb4d6101ea65c3f716ca6546c4d82b767bdf.zip kernel_samsung_smdk4412-2ccddb4d6101ea65c3f716ca6546c4d82b767bdf.tar.gz kernel_samsung_smdk4412-2ccddb4d6101ea65c3f716ca6546c4d82b767bdf.tar.bz2 | |
KVM: s390: move kvm_guest_enter,exit closer to sie
commit 2b29a9fdcb92bfc6b6f4c412d71505869de61a56 upstream.
Any uaccess between guest_enter and guest_exit could trigger a page fault,
the page fault handler would handle it as a guest fault and translate a
user address as guest address.
Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[bwh: Backported to 3.2: adjust context and add the rc variable]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Reviewed-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index f9804b7..1e88eef 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -445,6 +445,8 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, static void __vcpu_run(struct kvm_vcpu *vcpu) { + int rc; + memcpy(&vcpu->arch.sie_block->gg14, &vcpu->arch.guest_gprs[14], 16); if (need_resched()) @@ -455,21 +457,24 @@ static void __vcpu_run(struct kvm_vcpu *vcpu) kvm_s390_deliver_pending_interrupts(vcpu); + VCPU_EVENT(vcpu, 6, "entering sie flags %x", + atomic_read(&vcpu->arch.sie_block->cpuflags)); + vcpu->arch.sie_block->icptcode = 0; local_irq_disable(); kvm_guest_enter(); local_irq_enable(); - VCPU_EVENT(vcpu, 6, "entering sie flags %x", - atomic_read(&vcpu->arch.sie_block->cpuflags)); - if (sie64a(vcpu->arch.sie_block, vcpu->arch.guest_gprs)) { + rc = sie64a(vcpu->arch.sie_block, vcpu->arch.guest_gprs); + local_irq_disable(); + kvm_guest_exit(); + local_irq_enable(); + + if (rc) { VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); } VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", vcpu->arch.sie_block->icptcode); - local_irq_disable(); - kvm_guest_exit(); - local_irq_enable(); memcpy(&vcpu->arch.guest_gprs[14], &vcpu->arch.sie_block->gg14, 16); } |