[PATCH V2 6/6] kvm tools: Add PPC64 kvm_cpu__emulate_io()

[Matt Evans <matt@xxxxxxxxxx>]

This is the final piece of the puzzle for PPC SPAPR PCI; this
function splits MMIO accesses into the two PHB windows & directs
things to MMIO/IO emulation as appropriate.

Signed-off-by: Matt Evans <matt@xxxxxxxxxx>
---
 tools/kvm/Makefile                           |    1 +
 tools/kvm/powerpc/include/kvm/kvm-cpu-arch.h |   10 ++++++++-
 tools/kvm/powerpc/kvm-cpu.c                  |   29 ++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 1 deletions(-)

diff --git a/tools/kvm/Makefile b/tools/kvm/Makefile
index 0d42acf..6f3485b 100644
--- a/tools/kvm/Makefile
+++ b/tools/kvm/Makefile
@@ -134,6 +134,7 @@ ifeq ($(uname_M), ppc64)
 	OBJS	+= powerpc/spapr_hcall.o
 	OBJS	+= powerpc/spapr_rtas.o
 	OBJS	+= powerpc/spapr_hvcons.o
+	OBJS	+= powerpc/spapr_pci.o
 	OBJS	+= powerpc/xics.o
 	ARCH_INCLUDE := powerpc/include
 	CFLAGS 	+= -m64
diff --git a/tools/kvm/powerpc/include/kvm/kvm-cpu-arch.h b/tools/kvm/powerpc/include/kvm/kvm-cpu-arch.h
index c1c6539..7520c04 100644
--- a/tools/kvm/powerpc/include/kvm/kvm-cpu-arch.h
+++ b/tools/kvm/powerpc/include/kvm/kvm-cpu-arch.h
@@ -14,7 +14,7 @@
 /* Architecture-specific kvm_cpu definitions. */
 
 #include <linux/kvm.h>	/* for struct kvm_regs */
-
+#include <stdbool.h>
 #include <pthread.h>
 
 #define MSR_SF		(1UL<<63)
@@ -65,4 +65,12 @@ struct kvm_cpu {
 
 void kvm_cpu__irq(struct kvm_cpu *vcpu, int pin, int level);
 
+/* This is never actually called on PPC. */
+static inline bool kvm_cpu__emulate_io(struct kvm *kvm, u16 port, void *data, int direction, int size, u32 count)
+{
+	return false;
+}
+
+bool kvm_cpu__emulate_mmio(struct kvm *kvm, u64 phys_addr, u8 *data, u32 len, u8 is_write);
+
 #endif /* KVM__KVM_CPU_ARCH_H */
diff --git a/tools/kvm/powerpc/kvm-cpu.c b/tools/kvm/powerpc/kvm-cpu.c
index 5ef1cbf..4da4990 100644
--- a/tools/kvm/powerpc/kvm-cpu.c
+++ b/tools/kvm/powerpc/kvm-cpu.c
@@ -24,6 +24,7 @@
 #include <string.h>
 #include <errno.h>
 #include <stdio.h>
+#include <assert.h>
 
 static int debug_fd;
 
@@ -173,6 +174,34 @@ bool kvm_cpu__handle_exit(struct kvm_cpu *vcpu)
 	return ret;
 }
 
+bool kvm_cpu__emulate_mmio(struct kvm *kvm, u64 phys_addr, u8 *data, u32 len, u8 is_write)
+{
+	/*
+	 * FIXME: This function will need to be split in order to support
+	 * various PowerPC platforms/PHB types, etc.  It currently assumes SPAPR
+	 * PPC64 guest.
+	 */
+	bool ret = false;
+
+	if ((phys_addr >= SPAPR_PCI_IO_WIN_ADDR) &&
+	    (phys_addr < SPAPR_PCI_IO_WIN_ADDR + SPAPR_PCI_IO_WIN_SIZE)) {
+		ret = kvm__emulate_io(kvm, phys_addr - SPAPR_PCI_IO_WIN_ADDR,
+				      data, is_write ? KVM_EXIT_IO_OUT :
+				      KVM_EXIT_IO_IN,
+				      len, 1);
+	} else if ((phys_addr >= SPAPR_PCI_MEM_WIN_ADDR) &&
+		   (phys_addr < SPAPR_PCI_MEM_WIN_ADDR +
+		    SPAPR_PCI_MEM_WIN_SIZE)) {
+		ret = kvm__emulate_mmio(kvm, phys_addr - SPAPR_PCI_MEM_WIN_ADDR,
+					data, len, is_write);
+	} else {
+		pr_warning("MMIO %s unknown address %llx (size %d)!\n",
+			   is_write ? "write to" : "read from",
+			   phys_addr, len);
+	}
+	return ret;
+}
+
 #define CONDSTR_BIT(m, b) (((m) & MSR_##b) ? #b" " : "")
 
 void kvm_cpu__show_registers(struct kvm_cpu *vcpu)
-- 
1.7.0.4

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