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Commit e28100bd authored by Anup Patel's avatar Anup Patel Committed by Marc Zyngier
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arm64: KVM: Support X-Gene guest VCPU on APM X-Gene host 



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: default avatarAnup Patel <anup.patel@linaro.org>
Signed-off-by: default avatarPranavkumar Sawargaonkar <pranavkumar@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent da781470

arch/arm64/include/uapi/asm/kvm.h

+2 −1
Original line number Diff line number Diff line
@@ -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

arch/arm64/kvm/guest.c

+19 −13
Original line number Diff line number Diff line
@@ -207,21 +207,27 @@ 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:

		/* Currently handled by the generic backend */

			return KVM_ARM_TARGET_CORTEX_A57;

	default:

		};

		break;

	case ARM_CPU_IMP_APM:

		switch (part_number) {

		case APM_CPU_PART_POTENZA:

			return KVM_ARM_TARGET_XGENE_POTENZA;

		};

		break;

	};



	return -EINVAL;

}

}



int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,

			const struct kvm_vcpu_init *init)

arch/arm64/kvm/sys_regs_generic_v8.c

+3 −0
Original line number Diff line number Diff line
@@ -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);