path: root/virt/kvm
diff options
authorChristoffer Dall <christoffer.dall@linaro.org>2016-03-29 14:29:28 +0200
committerChristoffer Dall <christoffer.dall@linaro.org>2016-05-20 15:39:42 +0200
commit83091db981e105d97562d3ed3ffe676e21927e3a (patch)
tree3c3b98bd138cc65fbe134f6e9b04ab27d0c4eca8 /virt/kvm
parent2db4c104fa2a9af12c07433642e2e4fee37fe2fd (diff)
KVM: arm/arm64: Fix MMIO emulation data handling
When the kernel was handling a guest MMIO read access internally, we need to copy the emulation result into the run->mmio structure in order for the kvm_handle_mmio_return() function to pick it up and inject the result back into the guest. Currently the only user of kvm_io_bus for ARM is the VGIC, which did this copying itself, so this was not causing issues so far. But with the upcoming new vgic implementation we need this done properly. Update the kvm_handle_mmio_return description and cleanup the code to only perform a single copying when needed. Code and commit message inspired by Andre Przywara. Reported-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Diffstat (limited to 'virt/kvm')
1 files changed, 0 insertions, 7 deletions
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index f76bb6407243..c3bfbb981e73 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -819,7 +819,6 @@ static int vgic_handle_mmio_access(struct kvm_vcpu *vcpu,
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
struct vgic_io_device *iodev = container_of(this,
struct vgic_io_device, dev);
- struct kvm_run *run = vcpu->run;
const struct vgic_io_range *range;
struct kvm_exit_mmio mmio;
bool updated_state;
@@ -848,12 +847,6 @@ static int vgic_handle_mmio_access(struct kvm_vcpu *vcpu,
updated_state = false;
- run->mmio.is_write = is_write;
- run->mmio.len = len;
- run->mmio.phys_addr = addr;
- memcpy(run->mmio.data, val, len);
- kvm_handle_mmio_return(vcpu, run);
if (updated_state)