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authorAvi Kivity <avi@qumranet.com>2007-07-17 14:20:30 +0300
committerAvi Kivity <avi@qumranet.com>2007-07-20 20:16:29 +0300
commit35f3f28613bc7263949db23a4c7078e425810c8c (patch)
tree134729d56cf503029e1e667df9bfe30b7410ad3b /drivers/kvm/x86_emulate.c
parent90cb0529dd230548a7f0d6b315997be854caea1b (diff)
KVM: x86 emulator: implement rdmsr and wrmsr
Allow real-mode emulation of rdmsr and wrmsr. This allows smp Windows to boot, presumably for its sipi trampoline. Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/x86_emulate.c')
-rw-r--r--drivers/kvm/x86_emulate.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index f60012d6261..1b800fc0034 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -163,7 +163,7 @@ static u16 twobyte_table[256] = {
ModRM | ImplicitOps, ModRM, ModRM | ImplicitOps, ModRM, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
/* 0x30 - 0x3F */
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ ImplicitOps, 0, ImplicitOps, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x40 - 0x47 */
DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
@@ -486,6 +486,7 @@ x86_emulate_memop(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
unsigned long modrm_ea;
int use_modrm_ea, index_reg = 0, base_reg = 0, scale, rip_relative = 0;
int no_wb = 0;
+ u64 msr_data;
/* Shadow copy of register state. Committed on successful emulation. */
unsigned long _regs[NR_VCPU_REGS];
@@ -1344,6 +1345,29 @@ twobyte_special_insn:
goto cannot_emulate;
realmode_set_cr(ctxt->vcpu, modrm_reg, modrm_val, &_eflags);
break;
+ case 0x30:
+ /* wrmsr */
+ msr_data = (u32)_regs[VCPU_REGS_RAX]
+ | ((u64)_regs[VCPU_REGS_RDX] << 32);
+ rc = kvm_set_msr(ctxt->vcpu, _regs[VCPU_REGS_RCX], msr_data);
+ if (rc) {
+ kvm_arch_ops->inject_gp(ctxt->vcpu, 0);
+ _eip = ctxt->vcpu->rip;
+ }
+ rc = X86EMUL_CONTINUE;
+ break;
+ case 0x32:
+ /* rdmsr */
+ rc = kvm_get_msr(ctxt->vcpu, _regs[VCPU_REGS_RCX], &msr_data);
+ if (rc) {
+ kvm_arch_ops->inject_gp(ctxt->vcpu, 0);
+ _eip = ctxt->vcpu->rip;
+ } else {
+ _regs[VCPU_REGS_RAX] = (u32)msr_data;
+ _regs[VCPU_REGS_RDX] = msr_data >> 32;
+ }
+ rc = X86EMUL_CONTINUE;
+ break;
case 0xc7: /* Grp9 (cmpxchg8b) */
{
u64 old, new;