From: Alexander Graf Date: Wed, 11 Jun 2014 10:36:17 +0200 Subject: KVM: PPC: Book3S HV: Access host lppaca and shadow slb in BE Origin: https://git.kernel.org/linus/0865a583a4881975cc4b621f4886c02f01600302 Some data structures are always stored in big endian. Among those are the LPPACA fields as well as the shadow slb. These structures might be shared with a hypervisor. So whenever we access those fields, make sure we do so in big endian byte order. Signed-off-by: Alexander Graf --- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index e66c1e38..bf5270e 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -32,10 +32,6 @@ #define VCPU_GPRS_TM(reg) (((reg) * ULONG_SIZE) + VCPU_GPR_TM) -#ifdef __LITTLE_ENDIAN__ -#error Need to fix lppaca and SLB shadow accesses in little endian mode -#endif - /* Values in HSTATE_NAPPING(r13) */ #define NAPPING_CEDE 1 #define NAPPING_NOVCPU 2 @@ -595,9 +591,10 @@ kvmppc_got_guest: ld r3, VCPU_VPA(r4) cmpdi r3, 0 beq 25f - lwz r5, LPPACA_YIELDCOUNT(r3) + li r6, LPPACA_YIELDCOUNT + LWZX_BE r5, r3, r6 addi r5, r5, 1 - stw r5, LPPACA_YIELDCOUNT(r3) + STWX_BE r5, r3, r6 li r6, 1 stb r6, VCPU_VPA_DIRTY(r4) 25: @@ -1442,9 +1439,10 @@ END_FTR_SECTION_IFCLR(CPU_FTR_TM) ld r8, VCPU_VPA(r9) /* do they have a VPA? */ cmpdi r8, 0 beq 25f - lwz r3, LPPACA_YIELDCOUNT(r8) + li r4, LPPACA_YIELDCOUNT + LWZX_BE r3, r8, r4 addi r3, r3, 1 - stw r3, LPPACA_YIELDCOUNT(r8) + STWX_BE r3, r8, r4 li r3, 1 stb r3, VCPU_VPA_DIRTY(r9) 25: @@ -1757,8 +1755,10 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 33: ld r8,PACA_SLBSHADOWPTR(r13) .rept SLB_NUM_BOLTED - ld r5,SLBSHADOW_SAVEAREA(r8) - ld r6,SLBSHADOW_SAVEAREA+8(r8) + li r3, SLBSHADOW_SAVEAREA + LDX_BE r5, r8, r3 + addi r3, r3, 8 + LDX_BE r6, r8, r3 andis. r7,r5,SLB_ESID_V@h beq 1f slbmte r6,r5 -- 1.7.10.4