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x86: KVM: add xsetbv to the emulator 

To avoid hardcoding xsetbv length to '3' we need to support decoding it in
the emulator.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2019-08-13 15:53:32 +02:00 committed by Paolo Bonzini
parent 97413d2981
commit 02d4160fbd
4 changed files with 31 additions and 2 deletions
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3
arch/x86/include/asm/kvm_emulate.h
View File

@ -229,7 +229,7 @@ struct x86_emulate_ops {
int (*pre_leave_smm)(struct x86_emulate_ctxt *ctxt,
const char *smstate);
void (*post_leave_smm)(struct x86_emulate_ctxt *ctxt);
int (*set_xcr)(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr);
};
typedef u32 __attribute__((vector_size(16))) sse128_t;
@ -429,6 +429,7 @@ enum x86_intercept {
x86_intercept_ins,
x86_intercept_out,
x86_intercept_outs,
x86_intercept_xsetbv,
nr_x86_intercepts
};

23
arch/x86/kvm/emulate.c
View File

@ -4156,6 +4156,20 @@ out:
return rc;
}
static int em_xsetbv(struct x86_emulate_ctxt *ctxt)
{
u32 eax, ecx, edx;
eax = reg_read(ctxt, VCPU_REGS_RAX);
edx = reg_read(ctxt, VCPU_REGS_RDX);
ecx = reg_read(ctxt, VCPU_REGS_RCX);
if (ctxt->ops->set_xcr(ctxt, ecx, ((u64)edx << 32) | eax))
return emulate_gp(ctxt, 0);
return X86EMUL_CONTINUE;
}
static bool valid_cr(int nr)
{
switch (nr) {
@ -4409,6 +4423,12 @@ static const struct opcode group7_rm1[] = {
N, N, N, N, N, N,
};
static const struct opcode group7_rm2[] = {
N,
II(ImplicitOps | Priv, em_xsetbv, xsetbv),
N, N, N, N, N, N,
};
static const struct opcode group7_rm3[] = {
DIP(SrcNone | Prot | Priv, vmrun, check_svme_pa),
II(SrcNone | Prot | EmulateOnUD, em_hypercall, vmmcall),
@ -4498,7 +4518,8 @@ static const struct group_dual group7 = { {
}, {
EXT(0, group7_rm0),
EXT(0, group7_rm1),
N, EXT(0, group7_rm3),
EXT(0, group7_rm2),
EXT(0, group7_rm3),
II(SrcNone | DstMem | Mov, em_smsw, smsw), N,
II(SrcMem16 | Mov | Priv, em_lmsw, lmsw),
EXT(0, group7_rm7),

1
arch/x86/kvm/svm.c
View File

@ -6076,6 +6076,7 @@ static const struct __x86_intercept {
[x86_intercept_ins] = POST_EX(SVM_EXIT_IOIO),
[x86_intercept_out] = POST_EX(SVM_EXIT_IOIO),
[x86_intercept_outs] = POST_EX(SVM_EXIT_IOIO),
[x86_intercept_xsetbv] = PRE_EX(SVM_EXIT_XSETBV),
};
#undef PRE_EX

6
arch/x86/kvm/x86.c
View File

@ -6075,6 +6075,11 @@ static void emulator_post_leave_smm(struct x86_emulate_ctxt *ctxt)
kvm_smm_changed(emul_to_vcpu(ctxt));
}
static int emulator_set_xcr(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr)
{
return __kvm_set_xcr(emul_to_vcpu(ctxt), index, xcr);
}
static const struct x86_emulate_ops emulate_ops = {
.read_gpr = emulator_read_gpr,
.write_gpr = emulator_write_gpr,
@ -6116,6 +6121,7 @@ static const struct x86_emulate_ops emulate_ops = {
.set_hflags = emulator_set_hflags,
.pre_leave_smm = emulator_pre_leave_smm,
.post_leave_smm = emulator_post_leave_smm,
.set_xcr = emulator_set_xcr,
};
static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)