KVM: PPC: Book3S HV: Nested guest entry via hypercall

This adds a new hypercall, H_ENTER_NESTED, which is used by a nested
hypervisor to enter one of its nested guests.  The hypercall supplies
register values in two structs.  Those values are copied by the level 0
(L0) hypervisor (the one which is running in hypervisor mode) into the
vcpu struct of the L1 guest, and then the guest is run until an
interrupt or error occurs which needs to be reported to L1 via the
hypercall return value.

Currently this assumes that the L0 and L1 hypervisors are the same
endianness, and the structs passed as arguments are in native
endianness.  If they are of different endianness, the version number
check will fail and the hcall will be rejected.

Nested hypervisors do not support indep_threads_mode=N, so this adds
code to print a warning message if the administrator has set
indep_threads_mode=N, and treat it as Y.

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/hvcall.h

@@ -466,6 +466,42 @@ struct h_cpu_char_result {
 	u64 behaviour;
 };
 
+/* Register state for entering a nested guest with H_ENTER_NESTED */
+struct hv_guest_state {
+	u64 version;		/* version of this structure layout */
+	u32 lpid;
+	u32 vcpu_token;
+	/* These registers are hypervisor privileged (at least for writing) */
+	u64 lpcr;
+	u64 pcr;
+	u64 amor;
+	u64 dpdes;
+	u64 hfscr;
+	s64 tb_offset;
+	u64 dawr0;
+	u64 dawrx0;
+	u64 ciabr;
+	u64 hdec_expiry;
+	u64 purr;
+	u64 spurr;
+	u64 ic;
+	u64 vtb;
+	u64 hdar;
+	u64 hdsisr;
+	u64 heir;
+	u64 asdr;
+	/* These are OS privileged but need to be set late in guest entry */
+	u64 srr0;
+	u64 srr1;
+	u64 sprg[4];
+	u64 pidr;
+	u64 cfar;
+	u64 ppr;
+};
+
+/* Latest version of hv_guest_state structure */
+#define HV_GUEST_STATE_VERSION	1
+
 #endif /* __ASSEMBLY__ */
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_HVCALL_H */

arch/powerpc/include/asm/kvm_book3s.h

@@ -280,6 +280,13 @@ void kvmhv_vm_nested_init(struct kvm *kvm);
 long kvmhv_set_partition_table(struct kvm_vcpu *vcpu);
 void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1);
 void kvmhv_release_all_nested(struct kvm *kvm);
+long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu);
+int kvmhv_run_single_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu,
+			  u64 time_limit, unsigned long lpcr);
+void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr);
+void kvmhv_restore_hv_return_state(struct kvm_vcpu *vcpu,
+				   struct hv_guest_state *hr);
+long int kvmhv_nested_page_fault(struct kvm_vcpu *vcpu);
 
 void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac);
 

arch/powerpc/include/asm/kvm_host.h

@@ -95,6 +95,7 @@ struct dtl_entry;
 
 struct kvmppc_vcpu_book3s;
 struct kvmppc_book3s_shadow_vcpu;
+struct kvm_nested_guest;
 
 struct kvm_vm_stat {
 	ulong remote_tlb_flush;
@@ -786,6 +787,10 @@ struct kvm_vcpu_arch {
 	u32 emul_inst;
 
 	u32 online;
+
+	/* For support of nested guests */
+	struct kvm_nested_guest *nested;
+	u32 nested_vcpu_id;
 #endif
 
 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING

arch/powerpc/kernel/asm-offsets.c

@@ -503,6 +503,7 @@ int main(void)
 	OFFSET(VCPU_VPA, kvm_vcpu, arch.vpa.pinned_addr);
 	OFFSET(VCPU_VPA_DIRTY, kvm_vcpu, arch.vpa.dirty);
 	OFFSET(VCPU_HEIR, kvm_vcpu, arch.emul_inst);
+	OFFSET(VCPU_NESTED, kvm_vcpu, arch.nested);
 	OFFSET(VCPU_CPU, kvm_vcpu, cpu);
 	OFFSET(VCPU_THREAD_CPU, kvm_vcpu, arch.thread_cpu);
 #endif