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[v2,27/30] KVM: MIPS/Emulate: Fix CACHE emulation for EVA hosts

Message ID c385db5b00ed2223c500271231626c4d5be84598.1486036366.git-series.james.hogan@imgtec.com (mailing list archive)
State New, archived
Headers show

Commit Message

James Hogan Feb. 2, 2017, 12:04 p.m. UTC 
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
---
 arch/mips/kvm/emulate.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
diff mbox

Patch

diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c
index 3ced662e012e..9ac8e45017ce 100644
--- a/arch/mips/kvm/emulate.c
+++ b/arch/mips/kvm/emulate.c
@@ -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 @@  enum emulation_result kvm_mips_emulate_cache(union mips_instruction inst,
 		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 */