From: Marc Zyngier <marc.zyngier@arm.com>
To: Christoffer Dall <christoffer.dall@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Subject: [PATCH] arm64: KVM: vgic-v3: Restore ICH_APR0Rn_EL2 before ICH_APR0Rn_EL2
Date: Wed, 17 Feb 2016 15:35:12 +0000 [thread overview]
Message-ID: <1455723312-23896-1-git-send-email-marc.zyngier@arm.com> (raw)
The GICv3 architecture spec says:
Writing to the active priority registers in any order other than
the following order will result in UNPREDICTABLE behavior:
- ICH_AP0R<n>_EL2.
- ICH_AP1R<n>_EL2.
So let's not pointlessly go against the rule...
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
arch/arm64/kvm/hyp/vgic-v3-sr.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/arch/arm64/kvm/hyp/vgic-v3-sr.c b/arch/arm64/kvm/hyp/vgic-v3-sr.c
index 9142e082..93f6c5c 100644
--- a/arch/arm64/kvm/hyp/vgic-v3-sr.c
+++ b/arch/arm64/kvm/hyp/vgic-v3-sr.c
@@ -149,16 +149,6 @@ void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu)
switch (nr_pri_bits) {
case 7:
- write_gicreg(cpu_if->vgic_ap1r[3], ICH_AP1R3_EL2);
- write_gicreg(cpu_if->vgic_ap1r[2], ICH_AP1R2_EL2);
- case 6:
- write_gicreg(cpu_if->vgic_ap1r[1], ICH_AP1R1_EL2);
- default:
- write_gicreg(cpu_if->vgic_ap1r[0], ICH_AP1R0_EL2);
- }
-
- switch (nr_pri_bits) {
- case 7:
write_gicreg(cpu_if->vgic_ap0r[3], ICH_AP0R3_EL2);
write_gicreg(cpu_if->vgic_ap0r[2], ICH_AP0R2_EL2);
case 6:
@@ -167,6 +157,16 @@ void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu)
write_gicreg(cpu_if->vgic_ap0r[0], ICH_AP0R0_EL2);
}
+ switch (nr_pri_bits) {
+ case 7:
+ write_gicreg(cpu_if->vgic_ap1r[3], ICH_AP1R3_EL2);
+ write_gicreg(cpu_if->vgic_ap1r[2], ICH_AP1R2_EL2);
+ case 6:
+ write_gicreg(cpu_if->vgic_ap1r[1], ICH_AP1R1_EL2);
+ default:
+ write_gicreg(cpu_if->vgic_ap1r[0], ICH_AP1R0_EL2);
+ }
+
switch (max_lr_idx) {
case 15:
write_gicreg(cpu_if->vgic_lr[VGIC_V3_LR_INDEX(15)], ICH_LR15_EL2);
--
2.1.4
next reply other threads:[~2016-02-17 15:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-17 15:35 Marc Zyngier [this message]
2016-02-24 11:53 ` [PATCH] arm64: KVM: vgic-v3: Restore ICH_APR0Rn_EL2 before ICH_APR0Rn_EL2 Christoffer Dall
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