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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>
This commit is contained in:
Avi Kivity 2007-07-17 14:20:30 +03:00
parent 90cb0529dd
commit 35f3f28613
3 changed files with 31 additions and 5 deletions
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2
drivers/kvm/kvm.h
View File

@ -569,6 +569,8 @@ void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr); unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value, void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
unsigned long *rflags); unsigned long *rflags);
int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
struct x86_emulate_ctxt; struct x86_emulate_ctxt;

8
drivers/kvm/kvm_main.c
View File

@ -1517,7 +1517,7 @@ EXPORT_SYMBOL_GPL(kvm_get_msr_common);
* Returns 0 on success, non-0 otherwise. * Returns 0 on success, non-0 otherwise.
* Assumes vcpu_load() was already called. * Assumes vcpu_load() was already called.
*/ */
static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
{ {
return kvm_arch_ops->get_msr(vcpu, msr_index, pdata); return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
} }
@ -1595,7 +1595,7 @@ EXPORT_SYMBOL_GPL(kvm_set_msr_common);
* Returns 0 on success, non-0 otherwise. * Returns 0 on success, non-0 otherwise.
* Assumes vcpu_load() was already called. * Assumes vcpu_load() was already called.
*/ */
static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
{ {
return kvm_arch_ops->set_msr(vcpu, msr_index, data); return kvm_arch_ops->set_msr(vcpu, msr_index, data);
} }
@ -2133,7 +2133,7 @@ static __init void kvm_init_msr_list(void)
*/ */
static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
{ {
return set_msr(vcpu, index, *data); return kvm_set_msr(vcpu, index, *data);
} }
/* /*
@ -2617,7 +2617,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
break; break;
} }
case KVM_GET_MSRS: case KVM_GET_MSRS:
r = msr_io(vcpu, argp, get_msr, 1); r = msr_io(vcpu, argp, kvm_get_msr, 1);
break; break;
case KVM_SET_MSRS: case KVM_SET_MSRS:
r = msr_io(vcpu, argp, do_set_msr, 0); r = msr_io(vcpu, argp, do_set_msr, 0);

26
drivers/kvm/x86_emulate.c
View File

@ -163,7 +163,7 @@ static u16 twobyte_table[256] = {
ModRM | ImplicitOps, ModRM, ModRM | ImplicitOps, ModRM, 0, 0, 0, 0, ModRM | ImplicitOps, ModRM, ModRM | ImplicitOps, ModRM, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x30 - 0x3F */ /* 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 */ /* 0x40 - 0x47 */
DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
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; unsigned long modrm_ea;
int use_modrm_ea, index_reg = 0, base_reg = 0, scale, rip_relative = 0; int use_modrm_ea, index_reg = 0, base_reg = 0, scale, rip_relative = 0;
int no_wb = 0; int no_wb = 0;
u64 msr_data;
/* Shadow copy of register state. Committed on successful emulation. */ /* Shadow copy of register state. Committed on successful emulation. */
unsigned long _regs[NR_VCPU_REGS]; unsigned long _regs[NR_VCPU_REGS];
@ -1344,6 +1345,29 @@ twobyte_special_insn:
goto cannot_emulate; goto cannot_emulate;
realmode_set_cr(ctxt->vcpu, modrm_reg, modrm_val, &_eflags); realmode_set_cr(ctxt->vcpu, modrm_reg, modrm_val, &_eflags);
break; 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) */ case 0xc7: /* Grp9 (cmpxchg8b) */
{ {
u64 old, new; u64 old, new;