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authorCédric Le Goater <clg@fr.ibm.com>2014-01-09 11:51:16 +0100
committerAlexander Graf <agraf@suse.de>2014-01-27 16:00:39 +0100
commit736017752d2f6ed0d64f5e15cf48e79779b11c85 (patch)
treef8f11f7b4daf14e76e8e3d716c85f5a56a949476 /arch/powerpc/kvm/emulate.c
parent7a8ff56be68239bd36a2b639cb40bfbcfc58dad3 (diff)
KVM: PPC: Book3S: MMIO emulation support for little endian guests
MMIO emulation reads the last instruction executed by the guest and then emulates. If the guest is running in Little Endian order, or more generally in a different endian order of the host, the instruction needs to be byte-swapped before being emulated. This patch adds a helper routine which tests the endian order of the host and the guest in order to decide whether a byteswap is needed or not. It is then used to byteswap the last instruction of the guest in the endian order of the host before MMIO emulation is performed. Finally, kvmppc_handle_load() of kvmppc_handle_store() are modified to reverse the endianness of the MMIO if required. Signed-off-by: Cédric Le Goater <clg@fr.ibm.com> [agraf: add booke handling] Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/emulate.c')
-rw-r--r--arch/powerpc/kvm/emulate.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 2f9a0873b44f..c2b887be2c29 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -219,7 +219,6 @@ static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
* lmw
* stmw
*
- * XXX is_bigendian should depend on MMU mapping or MSR[LE]
*/
/* XXX Should probably auto-generate instruction decoding for a particular core
* from opcode tables in the future. */