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KVM: PPC: Book3S HV: XIVE: Add get/set accessors for the VP XIVE state

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The state of the thread interrupt management registers needs to be
collected for migration. These registers are cached under the
'xive_saved_state.w01' field of the VCPU when the VPCU context is
pulled from the HW thread. An OPAL call retrieves the backup of the
IPB register in the underlying XIVE NVT structure and merges it in the
KVM state.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Cédric Le Goater
2019-04-18 12:39:35 +02:00
committed by Paul Mackerras
parent e6714bd167
commit e4945b9da5
6 changed files with 131 additions and 0 deletions
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11
arch/powerpc/include/asm/kvm_ppc.h
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@@ -269,6 +269,7 @@ union kvmppc_one_reg {
u64 addr;
u64 length;
} vpaval;
u64 xive_timaval[2];
};
struct kvmppc_ops {
@@ -604,6 +605,10 @@ extern int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev,
extern void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu);
extern void kvmppc_xive_native_init_module(void);
extern void kvmppc_xive_native_exit_module(void);
extern int kvmppc_xive_native_get_vp(struct kvm_vcpu *vcpu,
union kvmppc_one_reg *val);
extern int kvmppc_xive_native_set_vp(struct kvm_vcpu *vcpu,
union kvmppc_one_reg *val);
#else
static inline int kvmppc_xive_set_xive(struct kvm *kvm, u32 irq, u32 server,
@@ -636,6 +641,12 @@ static inline int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev,
static inline void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu) { }
static inline void kvmppc_xive_native_init_module(void) { }
static inline void kvmppc_xive_native_exit_module(void) { }
static inline int kvmppc_xive_native_get_vp(struct kvm_vcpu *vcpu,
union kvmppc_one_reg *val)
{ return 0; }
static inline int kvmppc_xive_native_set_vp(struct kvm_vcpu *vcpu,
union kvmppc_one_reg *val)
{ return -ENOENT; }
#endif /* CONFIG_KVM_XIVE */