[PATCH v5 03/12] hw/mips: Add API to convert KVM guest KSEG0 <-> GPA

James Hogan
2014-06-17T22:14:11Z

From: Sanjay Lal <sanjayl@kymasys.com>

Add API for converting physical addresses to KVM guest KSEG0 addresses,
and fix the existing API for converting KSEG0 addresses to physical
addresses to work in the KVM case. Both have the same sized KSEG0, so
it's just a case of fixing the mask.

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@kymasys.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
---
Changes in v5:
- KSEG0 doesn't actually change size, so fix mask in
cpu_mips_kseg0_to_phys() instead of having the KVM specific
cpu_mips_kvm_um_kseg0_to_phys().

Changes in v2:
- Expand commit message
- Remove unnecessary include
---
hw/mips/addr.c | 7 ++++++-
include/hw/mips/cpudevs.h | 2 ++
2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/hw/mips/addr.c b/hw/mips/addr.c
index 99488f1d2a6f..ff3b952600bb 100644
--- a/hw/mips/addr.c
+++ b/hw/mips/addr.c
@@ -25,10 +25,15 @@

uint64_t cpu_mips_kseg0_to_phys(void *opaque, uint64_t addr)
{
- return addr & 0x7fffffffll;
+ return addr & 0x1fffffffll;
}

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 6bea24bf102d..b2626f2922f4 100644
--- a/include/hw/mips/cpudevs.h
+++ b/include/hw/mips/cpudevs.h
@@ -5,6 +5,8 @@
/* mips_addr.c */
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_phys_to_kseg0(void *opaque, uint64_t addr);
+

/* mips_int.c */
void cpu_mips_irq_init_cpu(CPUMIPSState *env);
--
1.9.3