On Thu, Aug 30, Jan Beulich wrote: > approach): One is Paul's idea of making null_handler actually retrieve > RAM contents when (part of) the access touches RAM. Another might
This works for me:
static int null_read(const struct hvm_io_handler *io_handler,
uint64_t addr,
uint32_t size,
uint64_t *data)
{
struct vcpu *curr = current;
struct domain *currd = curr->domain;
p2m_type_t p2mt = p2m_invalid;
unsigned long gmfn = paddr_to_pfn(addr);
struct page_info *page;
char *p;
get_gfn_query_unlocked(currd, gmfn, &p2mt);
if ( p2mt != p2m_ram_rw )
{
*data = ~0ul;
}
else
{
page = get_page_from_gfn(currd, gmfn, NULL, P2M_UNSHARE);
if ( ! page )
{
memset(data, 0xee, size);
}
else
{
p = (char *)__map_domain_page(page) + (addr & ~PAGE_MASK);
memcpy(data, p, size);
unmap_domain_page(p);
put_page(page);
}
}
return X86EMUL_OKAY;
}
Olaf
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