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KVM: MIPS/TLB: Handle virtually tagged icaches

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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
This commit is contained in:
James Hogan 2017-03-14 10:25:46 +00:00
parent 4fa9de5a64
commit 1c506c9c10
1 changed files with 14 additions and 0 deletions
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14
arch/mips/kvm/tlb.c
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@ -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) |