[Qemu-devel] Inject Interrupt, Using VMCS during qemu live migration.

[Qemu-devel] Inject Interrupt, Using VMCS during qemu live migration.

[李 ヨンジュン]

Hello, I am trying to inject interrupt, in final phase of Live migration.

I use vmcs_write32 function to inject interrupt. This function is called
by qemu, with ioctl.

This is Code.

(KVM)

void vmcs_write32_provider(unsigned long field, u32 value)
{
vmcs_write32(field, value);
}


long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
case KVM_TEST_IOCTL: {
r=0;
//printk("Test IOCTL!!!\n");
int type = 0;
int trap=58;
u32 intr_fields= (0x80000000 | (type<<8) | trap);
vmcs_write32_provider(0x00004016,intr_fields);
printk("vmcs_write Success!!!\n");

goto out;
}


This code works perfectly when called by hypercall.(When call this
function in kvm_emulate_hypercall function by guest VM.)

But, when I trying to call this function by qemu(ioctl), This error
message is occurred.

http://pds23.egloos.com/pds/201209/09/86/f0062286_504c07a4bc3c7.png

I need help. Thank you.

Re: [Qemu-devel] Inject Interrupt, Using VMCS during qemu live migration.

[Gleb Natapov]

On Sun, Sep 09, 2012 at 12:09:00PM +0900, 李 ヨンジュン wrote:
> Hello, I am trying to inject interrupt, in final phase of Live migration.
> 
> I use vmcs_write32 function to inject interrupt. This function is called
> by qemu, with ioctl.
> 
> This is Code.
> 
> (KVM)
> 
> void vmcs_write32_provider(unsigned long field, u32 value)
> {
> vmcs_write32(field, value);
> }
> 
> 
> long kvm_arch_vcpu_ioctl(struct file *filp,
> unsigned int ioctl, unsigned long arg)
> {
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
> case KVM_TEST_IOCTL: {
> r=0;
> //printk("Test IOCTL!!!\n");
> int type = 0;
> int trap=58;
> u32 intr_fields= (0x80000000 | (type<<8) | trap);
> vmcs_write32_provider(0x00004016,intr_fields);
> printk("vmcs_write Success!!!\n");
> 
> goto out;
> }
This is not how you inject interrupts in KVM. You are calling
kvm_set_irq() instead.

> 
> 
> This code works perfectly when called by hypercall.(When call this
> function in kvm_emulate_hypercall function by guest VM.)
> 
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.
> 
> http://pds23.egloos.com/pds/201209/09/86/f0062286_504c07a4bc3c7.png
> 
You are trying to inject interrupt when interrupts are disabled.

--
			Gleb.

[Qemu-devel] Inject Interrupt, Using VMCS during qemu live migration.

[李 ヨンジュン]

[-- Attachment #1: Type: text/plain, Size: 1320 bytes --]

Hello, I am trying to inject interrupt, in final phase of Live migration.

I use vmcs_write32 function to inject interrupt. This function is called
by qemu, with ioctl.

This is Code.

(KVM)

void vmcs_write32_provider(unsigned long field, u32 value)
{
vmcs_write32(field, value);
}


long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
case KVM_TEST_IOCTL: {
r=0;
//printk("Test IOCTL!!!\n");
int type = 0;
int trap=58;
u32 intr_fields= (0x80000000 | (type<<8) | trap);
vmcs_write32_provider(0x00004016,intr_fields);
printk("vmcs_write Success!!!\n");

goto out;
}


This code works perfectly when called by hypercall.(When call this
function in kvm_emulate_hypercall function by guest VM.)

But, when I trying to call this function by qemu(ioctl), This error
message is occurred.

KVM: entry failed, hardware error 0x80000021

If you're running a guest on an Intel machine without unrestricted mode support, the failure can be most likely due to the guest entering an invalid state for Intel VT. For example, the guest maybe running in big real mode which is not supported on less recent Intel processors.


~~~~~~~~~~~~~~~~Register's Information's~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
RAX=00000000000000001~~~~~~~~~~~~~~~~~~~~~~~~


  I need help. Thank you.


[-- Attachment #2: Type: text/html, Size: 1654 bytes --]