Subject: [PATCH v1 44/55] KVM: PPC: Book3S HV P9: Test dawr_enabled() before saving host DAWR SPRs

From: Nicholas Piggin <[email-masked]>
Date: Mon, 26 Jul 2021 13:50:25 +1000

Some of the DAWR SPR access is already predicated on dawr_enabled(),
apply this to the remainder of the accesses.

Signed-off-by: Nicholas Piggin <[email-masked]>
---
 arch/powerpc/kvm/book3s_hv_p9_entry.c | 34 ++++++++++++++++-----------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv_p9_entry.c b/arch/powerpc/kvm/book3s_hv_p9_entry.c
index 0aad2bf29d6e..976687c3709a 100644
--- a/arch/powerpc/kvm/book3s_hv_p9_entry.c
+++ b/arch/powerpc/kvm/book3s_hv_p9_entry.c
@@ -656,13 +656,16 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc
 
 	host_hfscr = mfspr(SPRN_HFSCR);
 	host_ciabr = mfspr(SPRN_CIABR);
-	host_dawr0 = mfspr(SPRN_DAWR0);
-	host_dawrx0 = mfspr(SPRN_DAWRX0);
 	host_psscr = mfspr(SPRN_PSSCR);
 	host_pidr = mfspr(SPRN_PID);
-	if (cpu_has_feature(CPU_FTR_DAWR1)) {
-		host_dawr1 = mfspr(SPRN_DAWR1);
-		host_dawrx1 = mfspr(SPRN_DAWRX1);
+
+	if (dawr_enabled()) {
+		host_dawr0 = mfspr(SPRN_DAWR0);
+		host_dawrx0 = mfspr(SPRN_DAWRX0);
+		if (cpu_has_feature(CPU_FTR_DAWR1)) {
+			host_dawr1 = mfspr(SPRN_DAWR1);
+			host_dawrx1 = mfspr(SPRN_DAWRX1);
+		}
 	}
 
 	local_paca->kvm_hstate.host_purr = mfspr(SPRN_PURR);
@@ -996,15 +999,18 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc
 	mtspr(SPRN_HFSCR, host_hfscr);
 	if (vcpu->arch.ciabr != host_ciabr)
 		mtspr(SPRN_CIABR, host_ciabr);
-	if (vcpu->arch.dawr0 != host_dawr0)
-		mtspr(SPRN_DAWR0, host_dawr0);
-	if (vcpu->arch.dawrx0 != host_dawrx0)
-		mtspr(SPRN_DAWRX0, host_dawrx0);
-	if (cpu_has_feature(CPU_FTR_DAWR1)) {
-		if (vcpu->arch.dawr1 != host_dawr1)
-			mtspr(SPRN_DAWR1, host_dawr1);
-		if (vcpu->arch.dawrx1 != host_dawrx1)
-			mtspr(SPRN_DAWRX1, host_dawrx1);
+
+	if (dawr_enabled()) {
+		if (vcpu->arch.dawr0 != host_dawr0)
+			mtspr(SPRN_DAWR0, host_dawr0);
+		if (vcpu->arch.dawrx0 != host_dawrx0)
+			mtspr(SPRN_DAWRX0, host_dawrx0);
+		if (cpu_has_feature(CPU_FTR_DAWR1)) {
+			if (vcpu->arch.dawr1 != host_dawr1)
+				mtspr(SPRN_DAWR1, host_dawr1);
+			if (vcpu->arch.dawrx1 != host_dawrx1)
+				mtspr(SPRN_DAWRX1, host_dawrx1);
+		}
 	}
 
 	if (vc->dpdes)
-- 
2.23.0