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KVM: VMX: Fix guest debugging while in L2

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When we take a #DB or #BP vmexit while in guest mode, we first of all
need to check if there is ongoing guest debugging that might be
interested in the event. Currently, we unconditionally leave L2 and
inject the event into L1 if it is intercepting the exceptions. That
breaks things marvelously.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka 2016-02-09 20:15:18 +01:00 committed by Paolo Bonzini
parent 5bb16016ce
commit 6f05485d3a
1 changed files with 17 additions and 0 deletions
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17
arch/x86/kvm/vmx.c
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@ -968,6 +968,16 @@ static inline bool is_exception_n(u32 intr_info, u8 vector)
(INTR_TYPE_HARD_EXCEPTION | vector | INTR_INFO_VALID_MASK);
}
static inline bool is_debug(u32 intr_info)
{
return is_exception_n(intr_info, DB_VECTOR);
}
static inline bool is_breakpoint(u32 intr_info)
{
return is_exception_n(intr_info, BP_VECTOR);
}
static inline bool is_page_fault(u32 intr_info)
{
return is_exception_n(intr_info, PF_VECTOR);
@ -7753,6 +7763,13 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
else if (is_no_device(intr_info) &&
!(vmcs12->guest_cr0 & X86_CR0_TS))
return false;
else if (is_debug(intr_info) &&
vcpu->guest_debug &
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
return false;
else if (is_breakpoint(intr_info) &&
vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
return false;
return vmcs12->exception_bitmap &
(1u << (intr_info & INTR_INFO_VECTOR_MASK));
case EXIT_REASON_EXTERNAL_INTERRUPT: