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KVM: MIPS/Emulate: Fix CACHE emulation for EVA hosts

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Use protected_writeback_dcache_line() instead of flush_dcache_line(),
and protected_flush_icache_line() instead of flush_icache_line(), so
that CACHEE (the EVA variant) is used on EVA host kernels.

Without this, guest floating point branch delay slot emulation via a
trampoline on the user stack fails on EVA host kernels due to failure of
the icache sync, resulting in the break instruction getting skipped and
execution from the stack.

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: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
This commit is contained in:
James Hogan 2016-10-17 16:37:45 +01:00
parent dacc3ed1dd
commit 8af0e3c2e8
1 changed files with 3 additions and 3 deletions
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6
arch/mips/kvm/emulate.c
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@ -1792,7 +1792,7 @@ enum emulation_result kvm_mips_emulate_cache(union mips_instruction inst,
skip_fault:
/* XXXKYMA: Only a subset of cache ops are supported, used by Linux */
if (op_inst == Hit_Writeback_Inv_D || op_inst == Hit_Invalidate_D) {
flush_dcache_line(va);
protected_writeback_dcache_line(va);
#ifdef CONFIG_KVM_MIPS_DYN_TRANS
/*
@ -1802,8 +1802,8 @@ skip_fault:
kvm_mips_trans_cache_va(inst, opc, vcpu);
#endif
} else if (op_inst == Hit_Invalidate_I) {
flush_dcache_line(va);
flush_icache_line(va);
protected_writeback_dcache_line(va);
protected_flush_icache_line(va);
#ifdef CONFIG_KVM_MIPS_DYN_TRANS
/* Replace the CACHE instruction, with a SYNCI */