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authorJames Hogan <james.hogan@imgtec.com>2017-03-14 13:25:46 +0300
committerJames Hogan <james.hogan@imgtec.com>2017-03-28 17:36:17 +0300
commit1c506c9c104cf01d01a9633ad2e76f15f938c54c (patch)
tree27df069d8a6e31f4c76f4bfb18790727ae3d50c7 /arch/mips/kvm
parent4fa9de5a645a9770679032a7eea0604f9a36eaf3 (diff)
downloadlinux-1c506c9c104cf01d01a9633ad2e76f15f938c54c.tar.xz
KVM: MIPS/TLB: Handle virtually tagged icaches
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@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Daney <david.daney@cavium.com> Cc: Andreas Herrmann <andreas.herrmann@caviumnetworks.com> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
Diffstat (limited to 'arch/mips/kvm')
-rw-r--r--arch/mips/kvm/tlb.c14
1 files 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) |