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KVM: SVM: Add checks for IO instructions

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This patch adds code to check for IOIO intercepts on
instructions decoded by the KVM instruction emulator.

[avi: fix build error due to missing #define D2bvIP]

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2011-04-04 12:39:35 +02:00 committed by Avi Kivity
parent bf608f88fa
commit f6511935f4
3 changed files with 70 additions and 15 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
arch/x86/include/asm/kvm_emulate.h
View file

@ -346,6 +346,10 @@ enum x86_intercept {
x86_intercept_mwait,
x86_intercept_rdmsr,
x86_intercept_wrmsr,
x86_intercept_in,
x86_intercept_ins,
x86_intercept_out,
x86_intercept_outs,
nr_x86_intercepts
};

45
arch/x86/kvm/emulate.c
View file

@ -2623,6 +2623,28 @@ static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
static int check_perm_in(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
c->dst.bytes = min(c->dst.bytes, 4u);
if (!emulator_io_permited(ctxt, ctxt->ops, c->src.val, c->dst.bytes))
return emulate_gp(ctxt, 0);
return X86EMUL_CONTINUE;
}
static int check_perm_out(struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
c->src.bytes = min(c->src.bytes, 4u);
if (!emulator_io_permited(ctxt, ctxt->ops, c->dst.val, c->src.bytes))
return emulate_gp(ctxt, 0);
return X86EMUL_CONTINUE;
}
#define D(_y) { .flags = (_y) }
#define DI(_y, _i) { .flags = (_y), .intercept = x86_intercept_##_i }
#define DIP(_y, _i, _p) { .flags = (_y), .intercept = x86_intercept_##_i, \
@ -2640,6 +2662,7 @@ static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
#define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) }
#define D2bv(_f) D((_f) | ByteOp), D(_f)
#define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p)
#define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e)
#define D6ALU(_f) D2bv((_f) | DstMem | SrcReg | ModRM), \
@ -2773,8 +2796,8 @@ static struct opcode opcode_table[256] = {
I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op),
I(SrcImmByte | Mov | Stack, em_push),
I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op),
D2bv(DstDI | Mov | String), /* insb, insw/insd */
D2bv(SrcSI | ImplicitOps | String), /* outsb, outsw/outsd */
D2bvIP(DstDI | Mov | String, ins, check_perm_in), /* insb, insw/insd */
D2bvIP(SrcSI | ImplicitOps | String, outs, check_perm_out), /* outsb, outsw/outsd */
/* 0x70 - 0x7F */
X16(D(SrcImmByte)),
/* 0x80 - 0x87 */
@ -2825,11 +2848,13 @@ static struct opcode opcode_table[256] = {
N, N, N, N, N, N, N, N,
/* 0xE0 - 0xE7 */
X4(D(SrcImmByte)),
D2bv(SrcImmUByte | DstAcc), D2bv(SrcAcc | DstImmUByte),
D2bvIP(SrcImmUByte | DstAcc, in, check_perm_in),
D2bvIP(SrcAcc | DstImmUByte, out, check_perm_out),
/* 0xE8 - 0xEF */
D(SrcImm | Stack), D(SrcImm | ImplicitOps),
D(SrcImmFAddr | No64), D(SrcImmByte | ImplicitOps),
D2bv(SrcNone | DstAcc), D2bv(SrcAcc | ImplicitOps),
D2bvIP(SrcNone | DstAcc, in, check_perm_in),
D2bvIP(SrcAcc | ImplicitOps, out, check_perm_out),
/* 0xF0 - 0xF7 */
N, DI(ImplicitOps, icebp), N, N,
DI(ImplicitOps | Priv, hlt), D(ImplicitOps),
@ -2923,6 +2948,7 @@ static struct opcode twobyte_table[256] = {
#undef EXT
#undef D2bv
#undef D2bvIP
#undef I2bv
#undef D6ALU
@ -3731,11 +3757,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
case 0xed: /* in (e/r)ax,dx */
c->src.val = c->regs[VCPU_REGS_RDX];
do_io_in:
c->dst.bytes = min(c->dst.bytes, 4u);
if (!emulator_io_permited(ctxt, ops, c->src.val, c->dst.bytes)) {
rc = emulate_gp(ctxt, 0);
goto done;
}
if (!pio_in_emulated(ctxt, ops, c->dst.bytes, c->src.val,
&c->dst.val))
goto done; /* IO is needed */
@ -3744,12 +3765,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
case 0xef: /* out dx,(e/r)ax */
c->dst.val = c->regs[VCPU_REGS_RDX];
do_io_out:
c->src.bytes = min(c->src.bytes, 4u);
if (!emulator_io_permited(ctxt, ops, c->dst.val,
c->src.bytes)) {
rc = emulate_gp(ctxt, 0);
goto done;
}
ops->pio_out_emulated(c->src.bytes, c->dst.val,
&c->src.val, 1, ctxt->vcpu);
c->dst.type = OP_NONE; /* Disable writeback. */

36
arch/x86/kvm/svm.c
View file

@ -3925,6 +3925,10 @@ static struct __x86_intercept {
[x86_intercept_iret] = PRE_EX(SVM_EXIT_IRET),
[x86_intercept_icebp] = PRE_EX(SVM_EXIT_ICEBP),
[x86_intercept_hlt] = POST_EX(SVM_EXIT_HLT),
[x86_intercept_in] = POST_EX(SVM_EXIT_IOIO),
[x86_intercept_ins] = POST_EX(SVM_EXIT_IOIO),
[x86_intercept_out] = POST_EX(SVM_EXIT_IOIO),
[x86_intercept_outs] = POST_EX(SVM_EXIT_IOIO),
};
#undef PRE_EX
@ -4001,6 +4005,38 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu,
*/
if (info->rep_prefix != REPE_PREFIX)
goto out;
case SVM_EXIT_IOIO: {
u64 exit_info;
u32 bytes;
exit_info = (vcpu->arch.regs[VCPU_REGS_RDX] & 0xffff) << 16;
if (info->intercept == x86_intercept_in ||
info->intercept == x86_intercept_ins) {
exit_info |= SVM_IOIO_TYPE_MASK;
bytes = info->src_bytes;
} else {
bytes = info->dst_bytes;
}
if (info->intercept == x86_intercept_outs ||
info->intercept == x86_intercept_ins)
exit_info |= SVM_IOIO_STR_MASK;
if (info->rep_prefix)
exit_info |= SVM_IOIO_REP_MASK;
bytes = min(bytes, 4u);
exit_info |= bytes << SVM_IOIO_SIZE_SHIFT;
exit_info |= (u32)info->ad_bytes << (SVM_IOIO_ASIZE_SHIFT - 1);
vmcb->control.exit_info_1 = exit_info;
vmcb->control.exit_info_2 = info->next_rip;
break;
}
default:
break;
}