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authorPaul Mackerras <paulus@ozlabs.org>2017-03-21 07:43:47 +0300
committerPaul Mackerras <paulus@ozlabs.org>2017-04-20 04:37:38 +0300
commitceba57df43a25ede55a96a795703c46022b1d1d0 (patch)
treeb20a7bab7f41f2596750ba971bac86c084cd3c44 /arch/powerpc/kvm/emulate_loadstore.c
parent91242fd1a3eb96e4efe43bdf96c2fcec97fdf4ff (diff)
downloadlinux-ceba57df43a25ede55a96a795703c46022b1d1d0.tar.xz
KVM: PPC: Emulation for more integer loads and stores
This adds emulation for the following integer loads and stores, thus enabling them to be used in a guest for accessing emulated MMIO locations. - lhaux - lwaux - lwzux - ldu - lwa - stdux - stwux - stdu - ldbrx - stdbrx Previously, most of these would cause an emulation failure exit to userspace, though ldu and lwa got treated incorrectly as ld, and stdu got treated incorrectly as std. This also tidies up some of the formatting and updates the comment listing instructions that still need to be implemented. With this, all integer loads and stores that are defined in the Power ISA v2.07 are emulated, except for those that are permitted to trap when used on cache-inhibited or write-through mappings (and which do in fact trap on POWER8), that is, lmw/stmw, lswi/stswi, lswx/stswx, lq/stq, and l[bhwdq]arx/st[bhwdq]cx. Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/kvm/emulate_loadstore.c')
-rw-r--r--arch/powerpc/kvm/emulate_loadstore.c135
1 files changed, 86 insertions, 49 deletions
diff --git a/arch/powerpc/kvm/emulate_loadstore.c b/arch/powerpc/kvm/emulate_loadstore.c
index a0f27a30379d..f10ba0c2c202 100644
--- a/arch/powerpc/kvm/emulate_loadstore.c
+++ b/arch/powerpc/kvm/emulate_loadstore.c
@@ -58,18 +58,14 @@ static bool kvmppc_check_vsx_disabled(struct kvm_vcpu *vcpu)
}
#endif /* CONFIG_VSX */
-/* XXX to do:
- * lhax
- * lhaux
- * lswx
- * lswi
- * stswx
- * stswi
- * lha
- * lhau
- * lmw
- * stmw
+/*
+ * XXX to do:
+ * lfiwax, lfiwzx
+ * vector loads and stores
*
+ * Instructions that trap when used on cache-inhibited mappings
+ * are not emulated here: multiple and string instructions,
+ * lq/stq, and the load-reserve/store-conditional instructions.
*/
int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
{
@@ -110,6 +106,11 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
break;
+ case OP_31_XOP_LWZUX:
+ emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
+ kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
+ break;
+
case OP_31_XOP_LBZX:
emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
break;
@@ -121,26 +122,34 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
case OP_31_XOP_STDX:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 8, 1);
+ kvmppc_get_gpr(vcpu, rs), 8, 1);
+ break;
+
+ case OP_31_XOP_STDUX:
+ emulated = kvmppc_handle_store(run, vcpu,
+ kvmppc_get_gpr(vcpu, rs), 8, 1);
+ kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
case OP_31_XOP_STWX:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 4, 1);
+ kvmppc_get_gpr(vcpu, rs), 4, 1);
+ break;
+
+ case OP_31_XOP_STWUX:
+ emulated = kvmppc_handle_store(run, vcpu,
+ kvmppc_get_gpr(vcpu, rs), 4, 1);
+ kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
case OP_31_XOP_STBX:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 1, 1);
+ kvmppc_get_gpr(vcpu, rs), 1, 1);
break;
case OP_31_XOP_STBUX:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 1, 1);
+ kvmppc_get_gpr(vcpu, rs), 1, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
@@ -148,6 +157,11 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
break;
+ case OP_31_XOP_LHAUX:
+ emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
+ kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
+ break;
+
case OP_31_XOP_LHZX:
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
break;
@@ -159,14 +173,12 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
case OP_31_XOP_STHX:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 2, 1);
+ kvmppc_get_gpr(vcpu, rs), 2, 1);
break;
case OP_31_XOP_STHUX:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 2, 1);
+ kvmppc_get_gpr(vcpu, rs), 2, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
@@ -186,8 +198,7 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
case OP_31_XOP_STWBRX:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 4, 0);
+ kvmppc_get_gpr(vcpu, rs), 4, 0);
break;
case OP_31_XOP_LHBRX:
@@ -196,8 +207,16 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
case OP_31_XOP_STHBRX:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 2, 0);
+ kvmppc_get_gpr(vcpu, rs), 2, 0);
+ break;
+
+ case OP_31_XOP_LDBRX:
+ emulated = kvmppc_handle_load(run, vcpu, rt, 8, 0);
+ break;
+
+ case OP_31_XOP_STDBRX:
+ emulated = kvmppc_handle_store(run, vcpu,
+ kvmppc_get_gpr(vcpu, rs), 8, 0);
break;
case OP_31_XOP_LDX:
@@ -213,6 +232,11 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
emulated = kvmppc_handle_loads(run, vcpu, rt, 4, 1);
break;
+ case OP_31_XOP_LWAUX:
+ emulated = kvmppc_handle_loads(run, vcpu, rt, 4, 1);
+ kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
+ break;
+
#ifdef CONFIG_PPC_FPU
case OP_31_XOP_LFSX:
if (kvmppc_check_fp_disabled(vcpu))
@@ -267,16 +291,14 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
if (kvmppc_check_fp_disabled(vcpu))
return EMULATE_DONE;
emulated = kvmppc_handle_store(run, vcpu,
- VCPU_FPR(vcpu, rs),
- 8, 1);
+ VCPU_FPR(vcpu, rs), 8, 1);
break;
case OP_31_XOP_STFDUX:
if (kvmppc_check_fp_disabled(vcpu))
return EMULATE_DONE;
emulated = kvmppc_handle_store(run, vcpu,
- VCPU_FPR(vcpu, rs),
- 8, 1);
+ VCPU_FPR(vcpu, rs), 8, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
@@ -284,8 +306,7 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
if (kvmppc_check_fp_disabled(vcpu))
return EMULATE_DONE;
emulated = kvmppc_handle_store(run, vcpu,
- VCPU_FPR(vcpu, rs),
- 4, 1);
+ VCPU_FPR(vcpu, rs), 4, 1);
break;
#endif
@@ -472,10 +493,22 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
break;
#endif
- /* TBD: Add support for other 64 bit load variants like ldu etc. */
case OP_LD:
rt = get_rt(inst);
- emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);
+ switch (inst & 3) {
+ case 0: /* ld */
+ emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);
+ break;
+ case 1: /* ldu */
+ emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);
+ kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
+ break;
+ case 2: /* lwa */
+ emulated = kvmppc_handle_loads(run, vcpu, rt, 4, 1);
+ break;
+ default:
+ emulated = EMULATE_FAIL;
+ }
break;
case OP_LWZU:
@@ -498,31 +531,37 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
4, 1);
break;
- /* TBD: Add support for other 64 bit store variants like stdu, stdux, stdx etc. */
case OP_STD:
rs = get_rs(inst);
- emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 8, 1);
+ switch (inst & 3) {
+ case 0: /* std */
+ emulated = kvmppc_handle_store(run, vcpu,
+ kvmppc_get_gpr(vcpu, rs), 8, 1);
+ break;
+ case 1: /* stdu */
+ emulated = kvmppc_handle_store(run, vcpu,
+ kvmppc_get_gpr(vcpu, rs), 8, 1);
+ kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
+ break;
+ default:
+ emulated = EMULATE_FAIL;
+ }
break;
case OP_STWU:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 4, 1);
+ kvmppc_get_gpr(vcpu, rs), 4, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
case OP_STB:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 1, 1);
+ kvmppc_get_gpr(vcpu, rs), 1, 1);
break;
case OP_STBU:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 1, 1);
+ kvmppc_get_gpr(vcpu, rs), 1, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;
@@ -546,14 +585,12 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
case OP_STH:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 2, 1);
+ kvmppc_get_gpr(vcpu, rs), 2, 1);
break;
case OP_STHU:
emulated = kvmppc_handle_store(run, vcpu,
- kvmppc_get_gpr(vcpu, rs),
- 2, 1);
+ kvmppc_get_gpr(vcpu, rs), 2, 1);
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
break;