KVM: PPC: Book3S HV: Add a new config for P8 debug timing

Turn the existing Kconfig KVM_BOOK3S_HV_EXIT_TIMING into
KVM_BOOK3S_HV_P8_TIMING in preparation for the addition of a new
config for P9 timings.

This applies only to P8 code, the generic timing code is still kept
under KVM_BOOK3S_HV_EXIT_TIMING.
Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220525130554.2614394-3-farosas@linux.ibm.com

arch/powerpc/kernel/asm-offsets.c

@@ -379,7 +379,7 @@ int main(void)
 	OFFSET(VCPU_SPRG2, kvm_vcpu, arch.shregs.sprg2);
 	OFFSET(VCPU_SPRG3, kvm_vcpu, arch.shregs.sprg3);
 #endif
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	OFFSET(VCPU_TB_RMENTRY, kvm_vcpu, arch.rm_entry);
 	OFFSET(VCPU_TB_RMINTR, kvm_vcpu, arch.rm_intr);
 	OFFSET(VCPU_TB_RMEXIT, kvm_vcpu, arch.rm_exit);

arch/powerpc/kvm/Kconfig

@@ -128,7 +128,11 @@ config KVM_BOOK3S_64_PR
 	  and system calls on the host.
 
 config KVM_BOOK3S_HV_EXIT_TIMING
-	bool "Detailed timing for hypervisor real-mode code"
+	bool
+
+config KVM_BOOK3S_HV_P8_TIMING
+	bool "Detailed timing for hypervisor real-mode code (for POWER8)"
+	select KVM_BOOK3S_HV_EXIT_TIMING
 	depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS
 	help
 	  Calculate time taken for each vcpu in the real-mode guest entry,

arch/powerpc/kvm/book3s_hv_rmhandlers.S

@@ -237,14 +237,14 @@ kvm_novcpu_wakeup:
 	cmpdi	r4, 0
 	beq	kvmppc_primary_no_guest
 
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	addi	r3, r4, VCPU_TB_RMENTRY
 	bl	kvmhv_start_timing
 #endif
 	b	kvmppc_got_guest
 
 kvm_novcpu_exit:
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	ld	r4, HSTATE_KVM_VCPU(r13)
 	cmpdi	r4, 0
 	beq	13f
@@ -523,7 +523,7 @@ kvmppc_hv_entry:
 	li	r6, KVM_GUEST_MODE_HOST_HV
 	stb	r6, HSTATE_IN_GUEST(r13)
 
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	/* Store initial timestamp */
 	cmpdi	r4, 0
 	beq	1f
@@ -894,7 +894,7 @@ fast_guest_return:
 	li	r9, KVM_GUEST_MODE_GUEST_HV
 	stb	r9, HSTATE_IN_GUEST(r13)
 
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	/* Accumulate timing */
 	addi	r3, r4, VCPU_TB_GUEST
 	bl	kvmhv_accumulate_time
@@ -945,7 +945,7 @@ secondary_too_late:
 	cmpdi	r4, 0
 	beq	11f
 	stw	r12, VCPU_TRAP(r4)
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	addi	r3, r4, VCPU_TB_RMEXIT
 	bl	kvmhv_accumulate_time
 #endif
@@ -959,7 +959,7 @@ hdec_soon:
 	li	r12, BOOK3S_INTERRUPT_HV_DECREMENTER
 12:	stw	r12, VCPU_TRAP(r4)
 	mr	r9, r4
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	addi	r3, r4, VCPU_TB_RMEXIT
 	bl	kvmhv_accumulate_time
 #endif
@@ -1056,7 +1056,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
 	li	r0, MSR_RI
 	mtmsrd	r0, 1
 
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	addi	r3, r9, VCPU_TB_RMINTR
 	mr	r4, r9
 	bl	kvmhv_accumulate_time
@@ -1135,7 +1135,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
 
 guest_exit_cont:		/* r9 = vcpu, r12 = trap, r13 = paca */
 
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	addi	r3, r9, VCPU_TB_RMEXIT
 	mr	r4, r9
 	bl	kvmhv_accumulate_time
@@ -1495,7 +1495,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
 	mtspr	SPRN_LPCR,r8
 	isync
 
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	/* Finish timing, if we have a vcpu */
 	ld	r4, HSTATE_KVM_VCPU(r13)
 	cmpdi	r4, 0
@@ -2153,7 +2153,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_TM)
 	ld	r4, HSTATE_KVM_VCPU(r13)
 	std	r3, VCPU_DEC_EXPIRES(r4)
 
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	ld	r4, HSTATE_KVM_VCPU(r13)
 	addi	r3, r4, VCPU_TB_CEDE
 	bl	kvmhv_accumulate_time
@@ -2221,7 +2221,7 @@ kvm_end_cede:
 	/* get vcpu pointer */
 	ld	r4, HSTATE_KVM_VCPU(r13)
 
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 	addi	r3, r4, VCPU_TB_RMINTR
 	bl	kvmhv_accumulate_time
 #endif
@@ -2961,7 +2961,7 @@ kvmppc_fix_pmao:
 	isync
 	blr
 
-#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
+#ifdef CONFIG_KVM_BOOK3S_HV_P8_TIMING
 /*
  * Start timing an activity
  * r3 = pointer to time accumulation struct, r4 = vcpu