Re: [Xen-devel] [PATCH v2 23/23] libxc/xc_dom_core: Copy ACPI tables to guest space

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

Hi Boris

On 2016/8/5 5:06, Boris Ostrovsky wrote:
> Load ACPI modules into guest space
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> ---
> v2:
> * New patch, loosely based on Shannon's ARM patch
> 
>  tools/libxc/xc_dom_core.c | 92 
> +++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 92 insertions(+)
> 
> diff --git a/tools/libxc/xc_dom_core.c b/tools/libxc/xc_dom_core.c
> index ebada89..00d870f 100644
> --- a/tools/libxc/xc_dom_core.c
> +++ b/tools/libxc/xc_dom_core.c
> @@ -1040,6 +1040,94 @@ static int xc_dom_build_ramdisk(struct xc_dom_image 
> *dom)
>      return -1;
>  }
>  
> +static int populate_acpi_pages(struct xc_dom_image *dom,
> +                               xen_pfn_t *extents,
> +                               unsigned int num_pages)
> +{
> +    int rc;
> +    xc_interface *xch = dom->xch;
> +    uint32_t domid = dom->guest_domid;
> +    unsigned long idx, first_high_idx = (1ull << (32 - 12));
> +
> +    for ( ; num_pages; num_pages--, extents++ )
> +    {
> +
> +        if ( xc_domain_populate_physmap(xch, domid, 1, 0, 0, extents) == 1 )
> +            continue;
> +
> +        if (dom->highmem_end)
> +        {
> +            idx = --dom->highmem_end;
> +            if ( idx == first_high_idx )
> +                dom->highmem_end = 0;
> +        }
> +        else
> +            idx = --dom->lowmem_end;
> +
> +        rc = xc_domain_add_to_physmap(xch, domid,
> +                                      XENMAPSPACE_gmfn,
> +                                      idx, *extents);
> +        if (rc)
> +            return rc;
> +    }
> +
> +    return 0;
> +}
> +
> +static int xc_dom_load_acpi(struct xc_dom_image *dom)
> +{
> +    int j, i = 0;
> +    unsigned num_pages;
> +    xen_pfn_t *extents, base;
> +    void *ptr;
> +
> +    while ( (i < MAX_ACPI_MODULES) && dom->acpi_modules[i].length )
> +    {
> +        DOMPRINTF("%s: %d bytes at address %lx\n", __FUNCTION__,
> +                  dom->acpi_modules[i].length,
> +                  dom->acpi_modules[i].guest_addr_out);
> +
> +        num_pages = (dom->acpi_modules[i].length + (XC_PAGE_SIZE - 1)) >>
> +                       XC_PAGE_SHIFT;
> +        extents = malloc(num_pages * sizeof(*extents));
> +        if ( !extents )
> +        {
> +            DOMPRINTF("%s: Out of memory", __FUNCTION__);
> +            goto err;
> +        }
> +
> +        base = dom->acpi_modules[i].guest_addr_out >> XC_PAGE_SHIFT;
> +        for (j=0; j<num_pages; j++)
> +            extents[j] = base + j;
> +        if ( populate_acpi_pages(dom, extents, num_pages) )
> +        {
> +            DOMPRINTF("%s: Can populate ACPI pages", __FUNCTION__);
> +            goto err;
> +        }
> +
> +        ptr = xc_map_foreign_range(dom->xch, dom->guest_domid,
> +                                      XC_PAGE_SIZE * num_pages,
> +                                      PROT_READ | PROT_WRITE, base);
> +        if ( !ptr )
> +        {
> +            DOMPRINTF("%s: Can't map %d pages at 0x%lx",
> +                      __FUNCTION__, num_pages, base);
> +            goto err;
> +        }
> +
> +        memcpy(ptr, dom->acpi_modules[i].data, dom->acpi_modules[i].length);
> +
> +        free(extents);
> +        i++;
> +    }
> +
> +    return 0;
> +
> +err:
> +    free(extents);
> +    return -1;
> +}
> +
>  int xc_dom_build_image(struct xc_dom_image *dom)
>  {
>      unsigned int page_size;
> @@ -1097,6 +1185,10 @@ int xc_dom_build_image(struct xc_dom_image *dom)
>          memcpy(devicetreemap, dom->devicetree_blob, dom->devicetree_size);
>      }
>  
> +    /* load ACPI tables */
> +    if ( xc_dom_load_acpi(dom) != 0 )
> +        goto err;
I think it needs to move the definition of xc_dom_load_acpi() to
xc_dom_x86.c while I will move the corresponding one of ARM to xc_dom_arm.c.

Thanks,
-- 
Shannon


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