If a nested guest does a NM fault but its CR0 doesn't contain the TS flag (because it was already cleared by the guest with L1 aid) then we have to activate FPU ourselves in L0 and then continue to L2. If TS flag is set then we fallback on the previous behavior, forward the fault to L1 if it asked for.
Signed-off-by: Anthoine Bourgeois <[email protected]> --- arch/x86/kvm/vmx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 2b2fce1..e33cadf 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -6627,6 +6627,9 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu) return 0; else if (is_page_fault(intr_info)) return enable_ept; + else if (is_no_device(intr_info) && + !(nested_read_cr0(vmcs12) & X86_CR0_TS)) + return 0; return vmcs12->exception_bitmap & (1u << (intr_info & INTR_INFO_VECTOR_MASK)); case EXIT_REASON_EXTERNAL_INTERRUPT: -- 1.8.3.2 Anthoine BOURGEOIS Bertin Technologies [email protected] Tél : 01 39 30 62 16 1
