From: David Daney <david.daney@cavium.com>
Date: Thu, 23 May 2013 16:49:06 +0000 (-0700)
Subject: mips/kvm: Fix ABI for use of 64-bit registers.
X-Git-Tag: v3.10-rc5~28^2~9
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=688cded320a4760de679160b42f9a81face02674;p=profile%2Fcommon%2Fkernel-common.git

mips/kvm: Fix ABI for use of 64-bit registers.

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@cavium.com>
Acked-by: Sanjay Lal <sanjayl@kymasys.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/mips/include/uapi/asm/kvm.h b/arch/mips/include/uapi/asm/kvm.h
index 0e8f565..86812fb 100644
--- a/arch/mips/include/uapi/asm/kvm.h
+++ b/arch/mips/include/uapi/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];
 };