[PATCH v4 02/10] hw/mips: Add API to convert KVM guest KSEG0 <-> GPA

[James Hogan <james.hogan@xxxxxxxxxx>]

From: Sanjay Lal <sanjayl@xxxxxxxxxxx>

Add APIs for converting between KVM guest KSEG0 addresses and guest
physical addresses. These will be used for translating addresses when
loading a kernel ELF in KVM mode.

In KVM trap and emulate mode both the guest kernel and guest userspace
execute in useg:
    Guest User address space:   0x00000000..0x3fffffff
    Guest Kernel Unmapped:      0x40000000..0x5fffffff
    Guest Kernel Mapped:        0x60000000..0x7fffffff

Signed-off-by: Sanjay Lal <sanjayl@xxxxxxxxxxx>
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Reviewed-by: Aurelien Jarno <aurelien@xxxxxxxxxxx>
---
Changes in v2:
 - Expand commit message
 - Remove unnecessary include
---
 hw/mips/addr.c            | 10 ++++++++++
 include/hw/mips/cpudevs.h |  4 ++++
 2 files changed, 14 insertions(+)

diff --git a/hw/mips/addr.c b/hw/mips/addr.c
index 99488f1..e62d6f4 100644
--- a/hw/mips/addr.c
+++ b/hw/mips/addr.c
@@ -28,7 +28,17 @@ uint64_t cpu_mips_kseg0_to_phys(void *opaque, uint64_t addr)
     return addr & 0x7fffffffll;
 }
 
+uint64_t cpu_mips_kvm_um_kseg0_to_phys(void *opaque, uint64_t addr)
+{
+    return addr & 0x3fffffffll;
+}
+
 uint64_t cpu_mips_phys_to_kseg0(void *opaque, uint64_t addr)
 {
     return addr | ~0x7fffffffll;
 }
+
+uint64_t cpu_mips_kvm_um_phys_to_kseg0(void *opaque, uint64_t addr)
+{
+    return addr | 0x40000000ll;
+}
diff --git a/include/hw/mips/cpudevs.h b/include/hw/mips/cpudevs.h
index 6bea24b..9e5af37 100644
--- a/include/hw/mips/cpudevs.h
+++ b/include/hw/mips/cpudevs.h
@@ -6,6 +6,10 @@
 uint64_t cpu_mips_kseg0_to_phys(void *opaque, uint64_t addr);
 uint64_t cpu_mips_phys_to_kseg0(void *opaque, uint64_t addr);
 
+uint64_t cpu_mips_kvm_um_kseg0_to_phys(void *opaque, uint64_t addr);
+uint64_t cpu_mips_kvm_um_phys_to_kseg0(void *opaque, uint64_t addr);
+
+
 /* mips_int.c */
 void cpu_mips_irq_init_cpu(CPUMIPSState *env);
 
-- 
1.8.1.2

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