KVM: ppc: PowerPC 440 KVM implementation

This functionality is definitely experimental, but is capable of running
unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only
tested with 440EP "Bamboo" guests so far, but with appropriate userspace
support other SoC/board combinations should work.)

See Documentation/powerpc/kvm_440.txt for technical details.

[stephen: build fix]

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/include/asm-powerpc/kvm_ppc.h b/include/asm-powerpc/kvm_ppc.h
new file mode 100644
index 000000000000..7ac820308a7e
--- /dev/null
+++ b/include/asm-powerpc/kvm_ppc.h
@@ -0,0 +1,88 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * Authors: Hollis Blanchard <hollisb@us.ibm.com>
+ */
+
+#ifndef __POWERPC_KVM_PPC_H__
+#define __POWERPC_KVM_PPC_H__
+
+/* This file exists just so we can dereference kvm_vcpu, avoiding nested header
+ * dependencies. */
+
+#include <linux/mutex.h>
+#include <linux/timer.h>
+#include <linux/types.h>
+#include <linux/kvm_types.h>
+#include <linux/kvm_host.h>
+
+struct kvm_tlb {
+	struct tlbe guest_tlb[PPC44x_TLB_SIZE];
+	struct tlbe shadow_tlb[PPC44x_TLB_SIZE];
+};
+
+enum emulation_result {
+	EMULATE_DONE,         /* no further processing */
+	EMULATE_DO_MMIO,      /* kvm_run filled with MMIO request */
+	EMULATE_DO_DCR,       /* kvm_run filled with DCR request */
+	EMULATE_FAIL,         /* can't emulate this instruction */
+};
+
+extern const unsigned char exception_priority[];
+extern const unsigned char priority_exception[];
+
+extern int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
+extern char kvmppc_handlers_start[];
+extern unsigned long kvmppc_handler_len;
+
+extern void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu);
+extern int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
+                              unsigned int rt, unsigned int bytes,
+                              int is_bigendian);
+extern int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
+                               u32 val, unsigned int bytes, int is_bigendian);
+
+extern int kvmppc_emulate_instruction(struct kvm_run *run,
+                                      struct kvm_vcpu *vcpu);
+
+extern void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn,
+                           u64 asid, u32 flags);
+extern void kvmppc_mmu_invalidate(struct kvm_vcpu *vcpu, u64 eaddr, u64 asid);
+extern void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode);
+
+extern void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu);
+
+static inline void kvmppc_queue_exception(struct kvm_vcpu *vcpu, int exception)
+{
+	unsigned int priority = exception_priority[exception];
+	set_bit(priority, &vcpu->arch.pending_exceptions);
+}
+
+static inline void kvmppc_clear_exception(struct kvm_vcpu *vcpu, int exception)
+{
+	unsigned int priority = exception_priority[exception];
+	clear_bit(priority, &vcpu->arch.pending_exceptions);
+}
+
+static inline void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr)
+{
+	if ((new_msr & MSR_PR) != (vcpu->arch.msr & MSR_PR))
+		kvmppc_mmu_priv_switch(vcpu, new_msr & MSR_PR);
+
+	vcpu->arch.msr = new_msr;
+}
+
+#endif /* __POWERPC_KVM_PPC_H__ */