When TLB entries are invalidated in the presence of a virtually tagged
icache, such as that found on Octeon CPUs, flush the icache so that we
don't get a reserved instruction exception even though the TLB mapping
is removed.
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: "Radim Krčmář" <rkrcmar@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: David Daney <david.daney@xxxxxxxxxx>
Cc: Andreas Herrmann <andreas.herrmann@xxxxxxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
---
arch/mips/kvm/tlb.c | 14 ++++++++++++++
1 file changed, 14 insertions(+), 0 deletions(-)
diff --git a/arch/mips/kvm/tlb.c b/arch/mips/kvm/tlb.c
index c215470fdcb0..fbab2f747721 100644
--- a/arch/mips/kvm/tlb.c
+++ b/arch/mips/kvm/tlb.c
@@ -185,6 +185,13 @@ int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va,
local_irq_restore(flags);
+ /*
+ * We don't want to get reserved instruction exceptions for missing tlb
+ * entries.
+ */
+ if (cpu_has_vtag_icache)
+ flush_icache_all();
+
if (user && idx_user >= 0)
kvm_debug("%s: Invalidated guest user entryhi %#lx @ idx %d\n",
__func__, (va & VPN2_MASK) |
@@ -260,6 +267,13 @@ int kvm_vz_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
htw_start();
local_irq_restore(flags);
+ /*
+ * We don't want to get reserved instruction exceptions for missing tlb
+ * entries.
+ */
+ if (cpu_has_vtag_icache)
+ flush_icache_all();
+
if (idx > 0)
kvm_debug("%s: Invalidated root entryhi %#lx @ idx %d\n",
__func__, (va & VPN2_MASK) |
--
git-series 0.8.10
