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KVM: x86: Push potential exception error code on task switches

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When a fault triggers a task switch, the error code, if existent, has to
be pushed on the new task's stack. Implement the missing bits.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka
2010-04-14 15:51:09 +02:00
committed by Avi Kivity
parent 0760d44868
commit e269fb2189
7 changed files with 48 additions and 10 deletions
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6
arch/x86/kvm/x86.c
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@@ -4778,7 +4778,8 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
return 0;
}
int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
bool has_error_code, u32 error_code)
{
int cs_db, cs_l, ret;
cache_all_regs(vcpu);
@@ -4796,7 +4797,8 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
ret = emulator_task_switch(&vcpu->arch.emulate_ctxt, &emulate_ops,
tss_selector, reason);
tss_selector, reason, has_error_code,
error_code);
if (ret == X86EMUL_CONTINUE)
kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);