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authorJames Hogan <james.hogan@imgtec.com>2014-01-17 13:01:31 +0100
committerRalf Baechle <ralf@linux-mips.org>2014-01-24 22:39:56 +0100
commit08596b0a757824df775cac0f4fa06975f578d3b2 (patch)
treed600208c08034e523dbd3466c32f83fea01521e5 /arch/mips/pci/pci-ip27.c
parentMIPS: KVM: use common EHINV aware UNIQUE_ENTRYHI (diff)
downloadlinux-08596b0a757824df775cac0f4fa06975f578d3b2.tar.xz
linux-08596b0a757824df775cac0f4fa06975f578d3b2.zip
MIPS: KVM: remove shadow_tlb code
The kvm_mips_init_shadow_tlb() function is called from kvm_arch_vcpu_init() and initialises entries 0 to current_cpu_data.tlbsize-1 of the virtual cpu's shadow_tlb[64] array. However newer cores with FTLBs can have a tlbsize > 64, for example the ProAptiv I'm testing on has a total tlbsize of 576. This causes kvm_mips_init_shadow_tlb() to overflow the shadow_tlb[64] array and overwrite the comparecount_timer among other things, causing a lock up when starting a KVM guest. Aside from kvm_mips_init_shadow_tlb() which only initialises it, the shadow_tlb[64] array is only actually used by the following functions: - kvm_shadow_tlb_put() & kvm_shadow_tlb_load() These are never called. The only call sites are #if 0'd out. - kvm_mips_dump_shadow_tlbs() This is never called. It was originally added for trap & emulate, but turned out to be unnecessary so it was disabled. So instead of fixing the shadow_tlb initialisation code, lets just remove the shadow_tlb[64] array and the above functions entirely. The only functional change here is the removal of broken shadow_tlb initialisation. The rest just deletes dead code. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: Gleb Natapov <gleb@redhat.com> Cc: kvm@vger.kernel.org Cc: Sanjay Lal <sanjayl@kymasys.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: John Crispin <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/6384/
Diffstat (limited to 'arch/mips/pci/pci-ip27.c')
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