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Scratch cop0 registers are needed by KVM to be able to save/restore all the GPRs, including k0/k1, and for storing the VCPU pointer. However no registers are universally suitable for these purposes, so the decision should be made at runtime. Until now, we've used DDATA_LO to store the VCPU pointer, and ErrorEPC as a temporary. It could be argued that this is abuse of those registers, and DDATA_LO is known not to be usable on certain implementations (Cavium Octeon). If KScratch registers are present, use them instead. We save & restore the temporary register in addition to the VCPU pointer register when using a KScratch register for it, as it may be used for normal host TLB handling too. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim KrÄmář <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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.. | ||
00README.txt | ||
callback.c | ||
commpage.c | ||
commpage.h | ||
dyntrans.c | ||
emulate.c | ||
entry.c | ||
fpu.S | ||
interrupt.c | ||
interrupt.h | ||
Kconfig | ||
Makefile | ||
mips.c | ||
mmu.c | ||
msa.S | ||
stats.c | ||
tlb.c | ||
trace.h | ||
trap_emul.c |