[PATCH 7/8] kvm tools: Add PPC64 kvm_cpu__emulate_io()

[Matt Evans <matt@ozlabs.org>]

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@ozlabs.org>
---
 tools/kvm/Makefile          |    1 +
 tools/kvm/powerpc/kvm-cpu.c |   34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/tools/kvm/Makefile b/tools/kvm/Makefile
index 6ffffc8..9b875dd 100644
--- a/tools/kvm/Makefile
+++ b/tools/kvm/Makefile
@@ -131,6 +131,7 @@ 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/kvm-cpu.c b/tools/kvm/powerpc/kvm-cpu.c
index 63cd106..0cf4dc8 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;
 
@@ -177,6 +178,39 @@ bool kvm_cpu__handle_exit(struct kvm_cpu *vcpu)
 	return ret;
 }
 
+bool kvm_cpu__emulate_io(struct kvm_cpu *cpu, struct kvm_run *kvm_run)
+{
+	bool ret = false;
+	u64 phys_addr;
+
+	/* We'll never get KVM_EXIT_IO, it's x86-specific.  All IO is MM! :P
+	 * So, look at our windows here & split addresses into I/O or MMIO.
+	 */
+	assert(kvm_run->exit_reason == KVM_EXIT_MMIO);
+
+	phys_addr = cpu->kvm_run->mmio.phys_addr;
+	if ((phys_addr >= SPAPR_PCI_IO_WIN_ADDR) &&
+	    (phys_addr < SPAPR_PCI_IO_WIN_ADDR + SPAPR_PCI_IO_WIN_SIZE)) {
+		ret = kvm__emulate_io(cpu->kvm, phys_addr - SPAPR_PCI_IO_WIN_ADDR,
+				      cpu->kvm_run->mmio.data,
+				      cpu->kvm_run->mmio.is_write ?
+				      KVM_EXIT_IO_OUT : KVM_EXIT_IO_IN,
+				      cpu->kvm_run->mmio.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(cpu->kvm,
+					cpu->kvm_run->mmio.phys_addr - SPAPR_PCI_MEM_WIN_ADDR,
+					cpu->kvm_run->mmio.data,
+					cpu->kvm_run->mmio.len,
+					cpu->kvm_run->mmio.is_write);
+	} else {
+		pr_warning("MMIO %s unknown address %lx (size %d)!\n",
+			   cpu->kvm_run->mmio.is_write ? "write to" : "read from",
+			   phys_addr, cpu->kvm_run->mmio.len);
+	}
+	return ret;
+}
+
 #define CONDSTR_BIT(m, b) (((m) & MSR_##b) ? #b" " : "")
 
 void kvm_cpu__show_registers(struct kvm_cpu *vcpu)