From: Anup Patel <anup.patel@xxxxxxxxxx>
This patch allows us to have X-Gene guest VCPU when using KVM arm64
on APM X-Gene host.
We add KVM_ARM_TARGET_XGENE_POTENZA for X-Gene Potenza compatible
guest VCPU and we return KVM_ARM_TARGET_XGENE_POTENZA in kvm_target_cpu()
when running on X-Gene host with Potenza core.
[maz: sanitized the commit log]
Signed-off-by: Anup Patel <anup.patel@xxxxxxxxxx>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
arch/arm64/include/uapi/asm/kvm.h | 3 ++-
arch/arm64/kvm/guest.c | 32 +++++++++++++++++++-------------
arch/arm64/kvm/sys_regs_generic_v8.c | 3 +++
3 files changed, 24 insertions(+), 14 deletions(-)
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 5031f42..d9f026b 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -55,8 +55,9 @@ struct kvm_regs {
#define KVM_ARM_TARGET_AEM_V8 0
#define KVM_ARM_TARGET_FOUNDATION_V8 1
#define KVM_ARM_TARGET_CORTEX_A57 2
+#define KVM_ARM_TARGET_XGENE_POTENZA 3
-#define KVM_ARM_NUM_TARGETS 3
+#define KVM_ARM_NUM_TARGETS 4
/* KVM_ARM_SET_DEVICE_ADDR ioctl id encoding */
#define KVM_ARM_DEVICE_TYPE_SHIFT 0
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 3f0731e..0874557 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -207,20 +207,26 @@ int __attribute_const__ kvm_target_cpu(void)
unsigned long implementor = read_cpuid_implementor();
unsigned long part_number = read_cpuid_part_number();
- if (implementor != ARM_CPU_IMP_ARM)
- return -EINVAL;
+ switch (implementor) {
+ case ARM_CPU_IMP_ARM:
+ switch (part_number) {
+ case ARM_CPU_PART_AEM_V8:
+ return KVM_ARM_TARGET_AEM_V8;
+ case ARM_CPU_PART_FOUNDATION:
+ return KVM_ARM_TARGET_FOUNDATION_V8;
+ case ARM_CPU_PART_CORTEX_A57:
+ return KVM_ARM_TARGET_CORTEX_A57;
+ };
+ break;
+ case ARM_CPU_IMP_APM:
+ switch (part_number) {
+ case APM_CPU_PART_POTENZA:
+ return KVM_ARM_TARGET_XGENE_POTENZA;
+ };
+ break;
+ };
- switch (part_number) {
- case ARM_CPU_PART_AEM_V8:
- return KVM_ARM_TARGET_AEM_V8;
- case ARM_CPU_PART_FOUNDATION:
- return KVM_ARM_TARGET_FOUNDATION_V8;
- case ARM_CPU_PART_CORTEX_A57:
- /* Currently handled by the generic backend */
- return KVM_ARM_TARGET_CORTEX_A57;
- default:
- return -EINVAL;
- }
+ return -EINVAL;
}
int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
diff --git a/arch/arm64/kvm/sys_regs_generic_v8.c b/arch/arm64/kvm/sys_regs_generic_v8.c
index 4268ab9..8fe6f76 100644
--- a/arch/arm64/kvm/sys_regs_generic_v8.c
+++ b/arch/arm64/kvm/sys_regs_generic_v8.c
@@ -90,6 +90,9 @@ static int __init sys_reg_genericv8_init(void)
&genericv8_target_table);
kvm_register_target_sys_reg_table(KVM_ARM_TARGET_CORTEX_A57,
&genericv8_target_table);
+ kvm_register_target_sys_reg_table(KVM_ARM_TARGET_XGENE_POTENZA,
+ &genericv8_target_table);
+
return 0;
}
late_initcall(sys_reg_genericv8_init);
--
1.8.5.1
--
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