Give user space more flexibility /wrt its IOCTL order. So far updating
the rflags via KVM_SET_REGS ignored potentially set single-step flags.
Now they will be kept.
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
arch/x86/kvm/x86.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index aa5d574..9fbb4c8 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3853,6 +3853,8 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
struct kvm_regs *regs)
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
+ unsigned long rflags;
+
vcpu_load(vcpu);
kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
@@ -3876,8 +3878,11 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
struct kvm_regs *regs)
#endif
kvm_rip_write(vcpu, regs->rip);
- kvm_x86_ops->set_rflags(vcpu, regs->rflags);
+ rflags = regs->rflags;
+ if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
+ rflags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
+ kvm_x86_ops->set_rflags(vcpu, rflags);
vcpu->arch.exception.pending = false;
--
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