4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nicolai Stange nstange@suse.de
commit 18b57ce2eb8c8b9a24174a89250cf5f57c76ecdc upstream
For VMEXITs caused by external interrupts, vmx_handle_external_intr() indirectly calls into the interrupt handlers through the host's IDT.
It follows that these interrupts get accounted for in the kvm_cpu_l1tf_flush_l1d per-cpu flag.
The subsequently executed vmx_l1d_flush() will thus be aware that some interrupts have happened and conduct a L1d flush anyway.
Setting l1tf_flush_l1d from vmx_handle_external_intr() isn't needed anymore. Drop it.
Signed-off-by: Nicolai Stange nstange@suse.de Signed-off-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: David Woodhouse dwmw@amazon.co.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kvm/vmx.c | 1 - 1 file changed, 1 deletion(-)
--- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -8929,7 +8929,6 @@ static void vmx_handle_external_intr(str [ss]"i"(__KERNEL_DS), [cs]"i"(__KERNEL_CS) ); - vcpu->arch.l1tf_flush_l1d = true; } } STACK_FRAME_NON_STANDARD(vmx_handle_external_intr);