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Code Issues Releases Activity

Do not create superpage mappings in the iommu.

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This is a workaround to hide the fact that we do not have any code to
demote a superpage mapping before we unmap a single page that is part
of the superpage.
This commit is contained in:
Neel Natu 2013-08-20 06:46:40 +00:00
parent f77e982952
commit b98940e5eb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=254549
1 changed files with 18 additions and 1 deletions
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19
sys/amd64/vmm/intel/vtd.c
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@ -611,13 +611,30 @@ vtd_create_domain(vm_paddr_t maxaddr)
dom = malloc(sizeof(struct domain), M_VTD, M_ZERO | M_WAITOK);
dom->pt_levels = pt_levels;
dom->addrwidth = addrwidth;
dom->spsmask = VTD_CAP_SPS(vtdmap->cap);
dom->id = domain_id();
dom->maxaddr = maxaddr;
dom->ptp = malloc(PAGE_SIZE, M_VTD, M_ZERO | M_WAITOK);
if ((uintptr_t)dom->ptp & PAGE_MASK)
panic("vtd_create_domain: ptp (%p) not page aligned", dom->ptp);
#ifdef notyet
/*
* XXX superpage mappings for the iommu do not work correctly.
*
* By default all physical memory is mapped into the host_domain.
* When a VM is allocated wired memory the pages belonging to it
* are removed from the host_domain and added to the vm's domain.
*
* If the page being removed was mapped using a superpage mapping
* in the host_domain then we need to demote the mapping before
* removing the page.
*
* There is not any code to deal with the demotion at the moment
* so we disable superpage mappings altogether.
*/
dom->spsmask = VTD_CAP_SPS(vtdmap->cap);
#endif
SLIST_INSERT_HEAD(&domhead, dom, next);
return (dom);