[PATCH 3/5] Implement H_SET_MODE for ppc64le

[Balbir Singh <bsingharora@xxxxxxxxx>]

Use the infrastructure for queuing a task to a specific vCPU and
sett ILE (Little Endian Interrupt Handling) on power via h_set_mode
hypercall

Signed-off-by: Balbir Singh <bsingharora@xxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
---
 powerpc/include/kvm/kvm-cpu-arch.h |  2 ++
 powerpc/kvm.c                      |  2 +-
 powerpc/spapr.h                    | 15 +++++++--
 powerpc/spapr_hcall.c              | 66 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 82 insertions(+), 3 deletions(-)

diff --git a/powerpc/include/kvm/kvm-cpu-arch.h b/powerpc/include/kvm/kvm-cpu-arch.h
index f2bfbb5..a69e0cc 100644
--- a/powerpc/include/kvm/kvm-cpu-arch.h
+++ b/powerpc/include/kvm/kvm-cpu-arch.h
@@ -38,6 +38,8 @@
 
 #define POWER7_EXT_IRQ	0
 
+#define LPCR_ILE	(1 << (63-38))
+
 struct kvm;
 
 struct kvm_cpu {
diff --git a/powerpc/kvm.c b/powerpc/kvm.c
index d147e0c..2dbd0fe 100644
--- a/powerpc/kvm.c
+++ b/powerpc/kvm.c
@@ -286,7 +286,7 @@ static int setup_fdt(struct kvm *kvm)
 	uint32_t	int_server_ranges_prop[] = {0, cpu_to_be32(smp_cpus)};
 	char 		hypertas_prop_kvm[] = "hcall-pft\0hcall-term\0"
 		"hcall-dabr\0hcall-interrupt\0hcall-tce\0hcall-vio\0"
-		"hcall-splpar\0hcall-bulk";
+		"hcall-splpar\0hcall-bulk\0hcall-set-mode";
 	int 		i, j;
 	char 		cpu_name[30];
 	u8		staging_fdt[FDT_MAX_SIZE];
diff --git a/powerpc/spapr.h b/powerpc/spapr.h
index 8b294d1..f851f4a 100644
--- a/powerpc/spapr.h
+++ b/powerpc/spapr.h
@@ -27,7 +27,7 @@ typedef uintptr_t target_phys_addr_t;
 #define H_HARDWARE	-1	/* Hardware error */
 #define H_FUNCTION	-2	/* Function not supported */
 #define H_PARAMETER	-4	/* Parameter invalid, out-of-range or conflicting */
-
+#define H_P2		-55
 #define H_SET_DABR		0x28
 #define H_LOGICAL_CI_LOAD	0x3c
 #define H_LOGICAL_CI_STORE	0x40
@@ -41,7 +41,18 @@ typedef uintptr_t target_phys_addr_t;
 #define H_EOI			0x64
 #define H_IPI			0x6c
 #define H_XIRR			0x74
-#define MAX_HCALL_OPCODE	H_XIRR
+#define H_SET_MODE		0x31C
+#define MAX_HCALL_OPCODE	H_SET_MODE
+
+/* Values for 2nd argument to H_SET_MODE */
+#define H_SET_MODE_RESOURCE_SET_CIABR		1
+#define H_SET_MODE_RESOURCE_SET_DAWR		2
+#define H_SET_MODE_RESOURCE_ADDR_TRANS_MODE	3
+#define H_SET_MODE_RESOURCE_LE			4
+
+/* Flags for H_SET_MODE_RESOURCE_LE */
+#define H_SET_MODE_ENDIAN_BIG		0
+#define H_SET_MODE_ENDIAN_LITTLE	1
 
 /*
  * The hcalls above are standardized in PAPR and implemented by pHyp
diff --git a/powerpc/spapr_hcall.c b/powerpc/spapr_hcall.c
index ff1d63a..25bec82 100644
--- a/powerpc/spapr_hcall.c
+++ b/powerpc/spapr_hcall.c
@@ -18,6 +18,7 @@
 
 #include <stdio.h>
 #include <assert.h>
+#include <sys/eventfd.h>
 
 static spapr_hcall_fn papr_hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
 static spapr_hcall_fn kvmppc_hypercall_table[KVMPPC_HCALL_MAX -
@@ -74,6 +75,70 @@ static target_ulong h_logical_dcbf(struct kvm_cpu *vcpu, target_ulong opcode, ta
 	return H_SUCCESS;
 }
 
+struct lpcr_data {
+	struct kvm_cpu	*cpu;
+	int		mode;
+};
+
+static void get_cpu_lpcr(struct kvm_cpu *vcpu, target_ulong *lpcr)
+{
+	struct kvm_one_reg reg = {
+		.id = KVM_REG_PPC_LPCR_64,
+		.addr = (__u64)lpcr
+	};
+
+	if (ioctl(vcpu->vcpu_fd, KVM_GET_ONE_REG, &reg))
+		die("Couldn't read vcpu reg?!");
+}
+
+static void set_cpu_lpcr(struct kvm_cpu *vcpu, target_ulong *lpcr)
+{
+	struct kvm_one_reg reg = {
+		.id = KVM_REG_PPC_LPCR_64,
+		.addr = (__u64)lpcr
+	};
+
+	if (ioctl(vcpu->vcpu_fd, KVM_SET_ONE_REG, &reg))
+		die("Couldn't write vcpu reg?!");
+}
+
+static void set_endian_task(struct kvm_cpu *vcpu, void *data)
+{
+	target_ulong mflags = (target_ulong)data;
+	target_ulong lpcr;
+
+	get_cpu_lpcr(vcpu, &lpcr);
+
+	if (mflags == H_SET_MODE_ENDIAN_BIG)
+		lpcr &= ~LPCR_ILE;
+	else
+		lpcr |= LPCR_ILE;
+
+	set_cpu_lpcr(vcpu, &lpcr);
+}
+
+static target_ulong h_set_mode(struct kvm_cpu *vcpu, target_ulong opcode, target_ulong *args)
+{
+	int ret;
+
+	switch (args[1]) {
+	case H_SET_MODE_RESOURCE_LE: {
+		struct kvm_cpu_task task;
+		task.func = set_endian_task;
+		task.data = (void *)args[0];
+		kvm_cpu__run_on_all_cpus(vcpu->kvm, &task);
+		ret = H_SUCCESS;
+		break;
+	}
+	default:
+		ret = H_FUNCTION;
+		break;
+	}
+
+	return ret;
+}
+
+
 void spapr_register_hypercall(target_ulong opcode, spapr_hcall_fn fn)
 {
 	spapr_hcall_fn *slot;
@@ -128,6 +193,7 @@ void hypercall_init(void)
 	spapr_register_hypercall(H_LOGICAL_CACHE_STORE, h_logical_store);
 	spapr_register_hypercall(H_LOGICAL_ICBI, h_logical_icbi);
 	spapr_register_hypercall(H_LOGICAL_DCBF, h_logical_dcbf);
+	spapr_register_hypercall(H_SET_MODE, h_set_mode);
 
 	/* KVM-PPC specific hcalls */
 	spapr_register_hypercall(KVMPPC_H_RTAS, h_rtas);
-- 
2.5.5

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