[PATCH 04/11] KVM: arm64: Define helper for ICH_VTR_EL2
Marc Zyngier
maz at kernel.org
Mon Jul 14 05:26:27 PDT 2025
Move the computation of the ICH_VTR_EL2 value to a common location,
so that it can be reused by the save/restore code.
Signed-off-by: Marc Zyngier <maz at kernel.org>
---
arch/arm64/kvm/sys_regs.c | 6 +-----
arch/arm64/kvm/vgic/vgic.h | 15 +++++++++++++++
2 files changed, 16 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 6981c1b34c2c4..6763910fdf1f3 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2521,11 +2521,7 @@ static bool access_gic_vtr(struct kvm_vcpu *vcpu,
if (p->is_write)
return write_to_read_only(vcpu, p, r);
- p->regval = kvm_vgic_global_state.ich_vtr_el2;
- p->regval &= ~(ICH_VTR_EL2_DVIM |
- ICH_VTR_EL2_A3V |
- ICH_VTR_EL2_IDbits);
- p->regval |= ICH_VTR_EL2_nV4;
+ p->regval = kvm_get_guest_vtr_el2();
return true;
}
diff --git a/arch/arm64/kvm/vgic/vgic.h b/arch/arm64/kvm/vgic/vgic.h
index af4bf80b785c3..67233fa04e709 100644
--- a/arch/arm64/kvm/vgic/vgic.h
+++ b/arch/arm64/kvm/vgic/vgic.h
@@ -66,6 +66,21 @@
#define KVM_ICC_SRE_EL2 (ICC_SRE_EL2_ENABLE | ICC_SRE_EL2_SRE | \
ICC_SRE_EL1_DIB | ICC_SRE_EL1_DFB)
+#define KVM_ICH_VTR_EL2_RES0 (ICH_VTR_EL2_DVIM | \
+ ICH_VTR_EL2_A3V | \
+ ICH_VTR_EL2_IDbits)
+#define KVM_ICH_VTR_EL2_RES1 ICH_VTR_EL2_nV4
+
+static inline u64 kvm_get_guest_vtr_el2(void)
+{
+ u64 vtr;
+
+ vtr = kvm_vgic_global_state.ich_vtr_el2;
+ vtr &= ~KVM_ICH_VTR_EL2_RES0;
+ vtr |= KVM_ICH_VTR_EL2_RES1;
+
+ return vtr;
+}
/*
* As per Documentation/virt/kvm/devices/arm-vgic-its.rst,
--
2.39.2
More information about the linux-arm-kernel
mailing list