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xen: fix retrieval of physical address

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When using Xen Dom0, it looks that /proc/self/pagemap returns 0.
This breaks the creation of mbufs pool.

We can workaround this in rte_mem_virt2phy() by browsing the dpdk memory
segments. This only works for dpdk memory, but it's enough to fix the
mempool creation.

Fixes: c042ba2067 ("mempool: rework support of Xen dom0")
Fixes: 3097de6e6b ("mem: get physical address of any pointer")

Reported-by: Huilong Xu <huilongx.xu@intel.com>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
This commit is contained in:
Olivier Matz 2016-07-11 12:20:27 +02:00 committed by Thomas Monjalon
parent 9d59b409ca
commit e33c4d9791
1 changed files with 23 additions and 0 deletions
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23
lib/librte_eal/linuxapp/eal/eal_memory.c
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@ -164,6 +164,29 @@ rte_mem_virt2phy(const void *virtaddr)
int page_size;
off_t offset;
/* when using dom0, /proc/self/pagemap always returns 0, check in
* dpdk memory by browsing the memsegs */
if (rte_xen_dom0_supported()) {
struct rte_mem_config *mcfg;
struct rte_memseg *memseg;
unsigned i;
mcfg = rte_eal_get_configuration()->mem_config;
for (i = 0; i < RTE_MAX_MEMSEG; i++) {
memseg = &mcfg->memseg[i];
if (memseg->addr == NULL)
break;
if (virtaddr > memseg->addr &&
virtaddr < RTE_PTR_ADD(memseg->addr,
memseg->len)) {
return memseg->phys_addr +
RTE_PTR_DIFF(virtaddr, memseg->addr);
}
}
return RTE_BAD_PHYS_ADDR;
}
/* Cannot parse /proc/self/pagemap, no need to log errors everywhere */
if (!proc_pagemap_readable)
return RTE_BAD_PHYS_ADDR;