target/arm/hvf: Add KVMID_TO_HVF, HVF_TO_KVMID

Conversion between KVM system registers ids and the HVF system
register ids is trivial.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index f68924ba1f3437a23fd2d8a209541e0b5f41b276..7515e59c56de0248552dff1eb3e070c489009972 100644 (file)
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -403,6 +403,26 @@ struct hvf_sreg_match {
     uint32_t cp_idx;
 };
 
+/*
+ * QEMU uses KVM system register ids in the migration format.
+ * Conveniently, HVF uses the same encoding of the op* and cr* parameters
+ * within the low 16 bits of the ids.  Thus conversion between the
+ * formats is trivial.
+ */
+
+#define KVMID_TO_HVF(KVM)  ((KVM) & 0xffff)
+#define HVF_TO_KVMID(HVF)  \
+    (CP_REG_ARM64 | CP_REG_SIZE_U64 | CP_REG_ARM64_SYSREG | (HVF))
+
+/* Verify this at compile-time. */
+
+#define DEF_SYSREG(HVF_ID, ...) \
+  QEMU_BUILD_BUG_ON(HVF_ID != KVMID_TO_HVF(KVMID_AA64_SYS_REG64(__VA_ARGS__)));
+
+#include "sysreg.c.inc"
+
+#undef DEF_SYSREG
+
 #define DEF_SYSREG(HVF_ID, op0, op1, crn, crm, op2) \
     { HVF_ID, HVF_SYSREG(crn, crm, op0, op1, op2) },