[RFC 48/55] KVM: arm64: Emulate TLBI instruction

Jintack Lim
2017-01-09T06:24:44Z

From: Christoffer Dall <christoffer.dall@linaro.org>

Currently, we flush ALL shadow stage-2 page tables on the tlbi
instruction execution. We may be able to do this more efficiently by
considering the vttbr_el2 value of the guest hypervisor, but leave it
for now.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Jintack Lim <jintack@cs.columbia.edu>
---
arch/arm64/kvm/sys_regs.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index ddb641c..b0a057d 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2013,8 +2013,14 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu,
static int emulate_tlbi(struct kvm_vcpu *vcpu,
struct sys_reg_params *params)
{
- /* TODO: support tlbi instruction emulation*/
- kvm_inject_undefined(vcpu);
+ /*
+ * We unmap ALL stage-2 page tables on tlbi instruction.
+ * We may make it more efficient by looking at the exact tlbi
+ * instruction.
+ */
+ stage2_unmap_vm(vcpu->kvm);
+ kvm_nested_s2_unmap(vcpu);
+
return 1;
}

--
1.9.1