We base it on the OS endian, as reflected by the endianness of the
interrupt vectors (handled through the ILE bit in the LPCR register).
This patch implements virtio_get_byteswap() over LPCR.
Using first_cpu to fetch the registers from KVM may look arbitrary
and awkward, but it is okay because KVM sets/unsets the ILE bit on
all CPUs.
Changes in v3:
- dropped the explicit calls to kvm_[get|put]_one_reg as LPCR is
now properly handled by the generic SPR code.
Changes in v2:
- call cpu_synchronize_state() instead of kvm_arch_get_registers().
Suggested-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Signed-off-by: Rusty Russell <ru...@rustcorp.com.au>
Signed-off-by: Greg Kurz <gk...@linux.vnet.ibm.com>
Reviewed-by: Alexander Graf <ag...@suse.de>
---
target-ppc/misc_helper.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/target-ppc/misc_helper.c b/target-ppc/misc_helper.c
index 616aab6..e8fc8a3 100644
--- a/target-ppc/misc_helper.c
+++ b/target-ppc/misc_helper.c
@@ -20,6 +20,8 @@
#include "helper.h"
#include "helper_regs.h"
+#include "hw/virtio/virtio.h"
+#include "sysemu/kvm.h"
/*****************************************************************************/
/* SPR accesses */
@@ -116,3 +118,13 @@ void ppc_store_msr(CPUPPCState *env, target_ulong value)
{
hreg_store_msr(env, value, 0);
}
+
+bool virtio_get_byteswap(void)
+{
+ PowerPCCPU *cp = POWERPC_CPU(first_cpu);
+ CPUPPCState *env = &cp->env;
+
+ cpu_synchronize_state(first_cpu);
+
+ return env->spr[SPR_LPCR] & LPCR_ILE;
+}
