From: David Daney <david.daney@xxxxxxxxxx>
All registers are 64-bits wide, 32-bit guests use the least
significant portion of the register storage fields.
Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
---
arch/mips/include/asm/kvm.h | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/arch/mips/include/asm/kvm.h b/arch/mips/include/asm/kvm.h
index 0e8f565..86812fb 100644
--- a/arch/mips/include/asm/kvm.h
+++ b/arch/mips/include/asm/kvm.h
@@ -18,12 +18,18 @@
#define N_MIPS_COPROC_REGS 32
#define N_MIPS_COPROC_SEL 8
-/* for KVM_GET_REGS and KVM_SET_REGS */
+/*
+ * for KVM_GET_REGS and KVM_SET_REGS
+ *
+ * If Config[AT] is zero (32-bit CPU), the register contents are
+ * stored in the lower 32-bits of the struct kvm_regs fields and sign
+ * extended to 64-bits.
+ */
struct kvm_regs {
- __u32 gprs[32];
- __u32 hi;
- __u32 lo;
- __u32 pc;
+ __u64 gprs[32];
+ __u64 hi;
+ __u64 lo;
+ __u64 pc;
__u32 cp0reg[N_MIPS_COPROC_REGS][N_MIPS_COPROC_SEL];
};
--
1.7.11.7
