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linux-sg2042
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KVM: Emulate hlt on real mode for Intel 

This has two use cases: the bios can't boot from disk, and guest smp
bootstrap.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-06-05 16:15:51 +03:00
parent d3bef15f84
commit 72d6e5a08a
3 changed files with 12 additions and 2 deletions
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1
drivers/kvm/kvm.h
View File

@ -347,6 +347,7 @@ struct kvm_vcpu {
u32 ar;
} tr, es, ds, fs, gs;
} rmode;
int halt_request; /* real mode on Intel only */
int cpuid_nent;
struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];

7
drivers/kvm/vmx.c
View File

@ -1608,8 +1608,13 @@ static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
if (vcpu->rmode.active &&
handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
error_code))
error_code)) {
if (vcpu->halt_request) {
vcpu->halt_request = 0;
return kvm_emulate_halt(vcpu);
}
return 1;
}
if ((intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK)) == (INTR_TYPE_EXCEPTION | 1)) {
kvm_run->exit_reason = KVM_EXIT_DEBUG;

6
drivers/kvm/x86_emulate.c
View File

@ -143,7 +143,8 @@ static u8 opcode_table[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0xF0 - 0xF7 */
0, 0, 0, 0,
0, 0, ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM,
ImplicitOps, 0,
ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM,
/* 0xF8 - 0xFF */
0, 0, 0, 0,
0, 0, ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM
@ -1149,6 +1150,9 @@ special_insn:
case 0xae ... 0xaf: /* scas */
DPRINTF("Urk! I don't handle SCAS.\n");
goto cannot_emulate;
case 0xf4: /* hlt */
ctxt->vcpu->halt_request = 1;
goto done;
}
goto writeback;