Commit 90c73795 authored by Cédric Le Goater's avatar Cédric Le Goater Committed by Paul Mackerras
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KVM: PPC: Book3S HV: Add a new KVM device for the XIVE native exploitation mode 



This is the basic framework for the new KVM device supporting the XIVE
native exploitation mode. The user interface exposes a new KVM device
to be created by QEMU, only available when running on a L0 hypervisor.
Support for nested guests is not available yet.

The XIVE device reuses the device structure of the XICS-on-XIVE device
as they have a lot in common. That could possibly change in the future
if the need arise.

Signed-off-by: default avatarCédric Le Goater <clg@kaod.org>
Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
parent a878957a

Documentation/virtual/kvm/devices/xive.txt

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POWER9 eXternal Interrupt Virtualization Engine (XIVE Gen1)

==========================================================



Device types supported:

  KVM_DEV_TYPE_XIVE     POWER9 XIVE Interrupt Controller generation 1



This device acts as a VM interrupt controller. It provides the KVM

interface to configure the interrupt sources of a VM in the underlying

POWER9 XIVE interrupt controller.



Only one XIVE instance may be instantiated. A guest XIVE device

requires a POWER9 host and the guest OS should have support for the

XIVE native exploitation interrupt mode. If not, it should run using

the legacy interrupt mode, referred as XICS (POWER7/8).



* Groups:



  1. KVM_DEV_XIVE_GRP_CTRL

  Provides global controls on the device

arch/powerpc/include/asm/kvm_host.h

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@@ -225,6 +225,7 @@ extern struct kvm_device_ops kvm_xics_ops; 
struct kvmppc_xive;

struct kvmppc_xive_vcpu;

extern struct kvm_device_ops kvm_xive_ops;

extern struct kvm_device_ops kvm_xive_native_ops;



struct kvmppc_passthru_irqmap;

arch/powerpc/include/asm/kvm_ppc.h

+8 −0
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@@ -593,6 +593,10 @@ extern int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu, u64 icpval); 
extern int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq,

			       int level, bool line_status);

extern void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu);



extern void kvmppc_xive_native_init_module(void);

extern void kvmppc_xive_native_exit_module(void);



#else

static inline int kvmppc_xive_set_xive(struct kvm *kvm, u32 irq, u32 server,

				       u32 priority) { return -1; }
@@ -616,6 +620,10 @@ static inline int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu, u64 icpval) { retur 
static inline int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq,

				      int level, bool line_status) { return -ENODEV; }

static inline void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu) { }



static inline void kvmppc_xive_native_init_module(void) { }

static inline void kvmppc_xive_native_exit_module(void) { }



#endif /* CONFIG_KVM_XIVE */



#if defined(CONFIG_PPC_POWERNV) && defined(CONFIG_KVM_BOOK3S_64_HANDLER)

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

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@@ -677,4 +677,7 @@ struct kvm_ppc_cpu_char { 
#define  KVM_XICS_PRESENTED		(1ULL << 43)

#define  KVM_XICS_QUEUED		(1ULL << 44)



/* POWER9 XIVE Native Interrupt Controller */

#define KVM_DEV_XIVE_GRP_CTRL		1



#endif /* __LINUX_KVM_POWERPC_H */

arch/powerpc/kvm/Makefile

+1 −1
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@@ -94,7 +94,7 @@ endif 
kvm-book3s_64-objs-$(CONFIG_KVM_XICS) += \

	book3s_xics.o



kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o

kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o book3s_xive_native.o

kvm-book3s_64-objs-$(CONFIG_SPAPR_TCE_IOMMU) += book3s_64_vio.o



kvm-book3s_64-module-objs := \

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