MIPS: KVM: Drop unused host_cp0_entryhi

The host EntryHi in the KVM VCPU context is virtually unused. It gets
stored on exceptions, but only ever used in a kvm_debug() when a TLB
miss occurs.

Drop it entirely, removing that information from the kvm_debug output.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/mips/include/asm/kvm_host.h

@@ -346,7 +346,6 @@ struct kvm_vcpu_arch {
 	unsigned long host_cp0_badvaddr;
 	unsigned long host_cp0_cause;
 	unsigned long host_cp0_epc;
-	unsigned long host_cp0_entryhi;
 
 	/* GPRS */
 	unsigned long gprs[32];

arch/mips/kernel/asm-offsets.c

@@ -364,7 +364,6 @@ void output_kvm_defines(void)
 	OFFSET(VCPU_HOST_CP0_BADVADDR, kvm_vcpu_arch, host_cp0_badvaddr);
 	OFFSET(VCPU_HOST_CP0_CAUSE, kvm_vcpu_arch, host_cp0_cause);
 	OFFSET(VCPU_HOST_EPC, kvm_vcpu_arch, host_cp0_epc);
-	OFFSET(VCPU_HOST_ENTRYHI, kvm_vcpu_arch, host_cp0_entryhi);
 
 	OFFSET(VCPU_R0, kvm_vcpu_arch, gprs[0]);
 	OFFSET(VCPU_R1, kvm_vcpu_arch, gprs[1]);

arch/mips/kvm/emulate.c

@@ -1634,7 +1634,6 @@ enum emulation_result kvm_mips_emulate_cache(uint32_t inst, uint32_t *opc,
 						   (cop0) & KVM_ENTRYHI_ASID));
 
 		if (index < 0) {
-			vcpu->arch.host_cp0_entryhi = (va & VPN2_MASK);
 			vcpu->arch.host_cp0_badvaddr = va;
 			vcpu->arch.pc = curr_pc;
 			er = kvm_mips_emulate_tlbmiss_ld(cause, NULL, run,
@@ -2576,8 +2575,8 @@ enum emulation_result kvm_mips_handle_tlbmiss(unsigned long cause,
 	unsigned long va = vcpu->arch.host_cp0_badvaddr;
 	int index;
 
-	kvm_debug("kvm_mips_handle_tlbmiss: badvaddr: %#lx, entryhi: %#lx\n",
-		  vcpu->arch.host_cp0_badvaddr, vcpu->arch.host_cp0_entryhi);
+	kvm_debug("kvm_mips_handle_tlbmiss: badvaddr: %#lx\n",
+		  vcpu->arch.host_cp0_badvaddr);
 
 	/*
 	 * KVM would not have got the exception if this entry was valid in the

arch/mips/kvm/locore.S

@@ -308,9 +308,6 @@ NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra)
 	mfc0	k0, CP0_CAUSE
 	LONG_S	k0, VCPU_HOST_CP0_CAUSE(k1)
 
-	mfc0	k0, CP0_ENTRYHI
-	LONG_S	k0, VCPU_HOST_ENTRYHI(k1)
-
 	/* Now restore the host state just enough to run the handlers */
 
 	/* Switch EBASE to the one used by Linux */