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

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>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 40991527f54a..58a295c6bf62 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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);