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Date: Sun, 9 Sep 2012 10:45:45 +0300
From: Gleb Natapov <gleb@redhat.com>
Message-ID: <20120909074544.GA4109@redhat.com>
References: <504C084C.4080900@gmail.com>
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Subject: Re: [Qemu-devel] Inject Interrupt,
 Using VMCS during qemu live migration.
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To: =?utf-8?B?5p2OIOODqOODs+OCuOODpeODsw==?= <getfeus@gmail.com>
Cc: qemu-devel@nongnu.org

On Sun, Sep 09, 2012 at 12:09:00PM +0900, =E6=9D=8E =E3=83=A8=E3=83=B3=E3=
=82=B8=E3=83=A5=E3=83=B3 wrote:
> Hello, I am trying to inject interrupt, in final phase of Live migration.
>=20
> I use vmcs_write32 function to inject interrupt. This function is called
> by qemu, with ioctl.
>=20
> This is Code.
>=20
> (KVM)
>=20
> void vmcs_write32_provider(unsigned long field, u32 value)
> {
> vmcs_write32(field, value);
> }
>=20
>=20
> long kvm_arch_vcpu_ioctl(struct file *filp,
> unsigned int ioctl, unsigned long arg)
> {
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
> case KVM_TEST_IOCTL: {
> r=3D0;
> //printk("Test IOCTL!!!\n");
> int type =3D 0;
> int trap=3D58;
> u32 intr_fields=3D (0x80000000 | (type<<8) | trap);
> vmcs_write32_provider(0x00004016,intr_fields);
> printk("vmcs_write Success!!!\n");
>=20
> goto out;
> }
This is not how you inject interrupts in KVM. You are calling
kvm_set_irq() instead.

>=20
>=20
> This code works perfectly when called by hypercall.(When call this
> function in kvm_emulate_hypercall function by guest VM.)
>=20
You mean this code sometimes accidentally has desirable effect.

> But, when I trying to call this function by qemu(ioctl), This error
> message is occurred.
>=20
> http://pds23.egloos.com/pds/201209/09/86/f0062286_504c07a4bc3c7.png
>=20
You are trying to inject interrupt when interrupts are disabled.

--
			Gleb.