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authorChristoffer Dall <c.dall@virtualopensystems.com>2013-01-20 18:43:58 -0500
committerChristoffer Dall <c.dall@virtualopensystems.com>2013-01-23 13:29:17 -0500
commit45e96ea6b369539a37040a8df9c59a39f073d9d6 (patch)
treeafe39e4ad356967d0bc02aa3f2b0b24afb79e819 /arch/arm/kvm/arm.c
parent94f8e6418d3915dbefbb5d66b63146f1df12b0c0 (diff)
downloadvexpress-lsk-45e96ea6b369539a37040a8df9c59a39f073d9d6.tar.gz
KVM: ARM: Handle I/O aborts
When the guest accesses I/O memory this will create data abort exceptions and they are handled by decoding the HSR information (physical address, read/write, length, register) and forwarding reads and writes to QEMU which performs the device emulation. Certain classes of load/store operations do not support the syndrome information provided in the HSR. We don't support decoding these (patches are available elsewhere), so we report an error to user space in this case. This requires changing the general flow somewhat since new calls to run the VCPU must check if there's a pending MMIO load and perform the write after userspace has made the data available. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
Diffstat (limited to 'arch/arm/kvm/arm.c')
-rw-r--r--arch/arm/kvm/arm.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index be06c5de51e..8680b9ffd2a 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -616,6 +616,12 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
if (ret)
return ret;
+ if (run->exit_reason == KVM_EXIT_MMIO) {
+ ret = kvm_handle_mmio_return(vcpu, vcpu->run);
+ if (ret)
+ return ret;
+ }
+
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);