mips: Add KVM T&E segment support for TCG

MIPS KVM trap & emulate guest kernels have a different segment layout
compared with traditional MIPS kernels, to allow both the user and
kernel code to run from the user address segment without repeatedly
trapping to KVM.

QEMU currently supports this layout only for KVM, but its sometimes
useful to be able to run these kernels in QEMU on a PC, so enable it for
TCG too.

This also paves the way for MIPS KVM VZ support (which uses the normal
virtual memory layout) by abstracting whether user mode kernel segments
are in use.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Yongbok Kim <yongbok.kim@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Reviewed-by: Richard Henderson <rth@twiddle.net>
[Yongbok Kim:
  minor change]
Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/hw/mips/addr.c b/hw/mips/addr.c
index e4e86b4a75..4da46e1731 100644
--- a/hw/mips/addr.c
+++ b/hw/mips/addr.c
@@ -24,6 +24,8 @@
 #include "hw/hw.h"
 #include "hw/mips/cpudevs.h"
 
+static int mips_um_ksegs;
+
 uint64_t cpu_mips_kseg0_to_phys(void *opaque, uint64_t addr)
 {
     return addr & 0x1fffffffll;
@@ -38,3 +40,13 @@ uint64_t cpu_mips_kvm_um_phys_to_kseg0(void *opaque, uint64_t addr)
 {
     return addr | 0x40000000ll;
 }
+
+bool mips_um_ksegs_enabled(void)
+{
+    return mips_um_ksegs;
+}
+
+void mips_um_ksegs_enable(void)
+{
+    mips_um_ksegs = 1;
+}