Re: [Xen-devel] xc_altp2m_set_vcpu_enable_notify fail

[Big Strong <fangtuo90@xxxxxxxxx>]

A bit more information on this. There is a on-going discussion on the
errno topic on xen-devel. The safe bet is that if you use errno in the
os it is probably in the os name space. If you get errno from hypercall
struct it should be in xen's name space.

Wei.

I don't know what is the cause of the vmfunc error, but I'm afraid that this is not caused by xc_altp2m_set_vcpu_enable_notify, as I can't reproduce the error using the code below:

#include <xenctrl.h>
#include <stdlib.h>
int main(int argc, char *argv[]){
    domid_t domid;
    int vcpuid;
    int rc = -1;
    if (argc != 3)
    {
        printf("arguments error, please input domid vcpuid\n");
        return -1;
    }
    else
    {
        domid = atoi(argv[1]);
        vcpuid = atoi(argv[2]);
    }

 

    xen_pfn_t new_gfn;

 

    //increase memory reservation for guest
    rc = xc_domain_increase_reservation_exact(xci, domid, 1,
        0, 0, &new_gfn);
    if(rc<0)
    {
        printf("fail to increase memory reservation\n");
        return -1;
    }
    printf("added memory:%ld\n",new_gfn);

 

    //map the memory to guest memory space
    rc = xc_domain_populate_physmap_exact(xci, domid, 1, 0, 0, &new_gfn);
    if(rc<0)
    {
        printf("fail to map increased memory\n");
        return -1;
    }

 

    //set #VE info area in VMCS 

    rc = xc_altp2m_set_vcpu_enable_notify(xci, domid, vcpuid, new_gfn);
    if(rc<0)
    {
        printf("fail to set #ve info page:%ld \n",new_gfn);
        return -1;
    }
    printf("succeed setting #ve info for page:%ld\n",new_gfn);

 
    //enable #VE in VMCS

    rc = xc_altp2m_set_domain_state(xci,domid,1);
    if(rc<0)
    {
        printf("error enabing #VE\n");
        return -1;
    }
    return 0;

 The code always stops at the xc_altp2m_set_vcpu_enable_notify, which is used to assign the new page as #VE info page. As I can't debug the Xen source code, I don't why xc_altp2m_set_vcpu_enable_notify always return -1. Any ideas?

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