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rte_vhost: introduce safe API for GPA translation

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This new rte_vhost_va_from_guest_pa API takes an extra len parameter,
used to specify the size of the range to be mapped.
Effective mapped range is returned via len parameter.

Change-Id: Ib3830e1da9e0cb477d99860a03684c665bb3f6ec
Reported-by: Yongji Xie <xieyongji@baidu.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/408717
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Dariusz Stojaczyk 2018-04-17 21:39:00 +02:00 committed by Daniel Verkamp
parent e5cfae172d
commit 867063e463
1 changed files with 40 additions and 0 deletions
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40
lib/vhost/rte_vhost/rte_vhost.h
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@ -143,6 +143,46 @@ rte_vhost_gpa_to_vva(struct rte_vhost_memory *mem, uint64_t gpa)
return 0; return 0;
} }
/**
* Convert guest physical address to host virtual address safely
*
* This variant of rte_vhost_gpa_to_vva() takes care all the
* requested length is mapped and contiguous in process address
* space.
*
* @param mem
* the guest memory regions
* @param gpa
* the guest physical address for querying
* @param len
* the size of the requested area to map,
* updated with actual size mapped
* @return
* the host virtual address on success, 0 on failure */
static __rte_always_inline uint64_t
rte_vhost_va_from_guest_pa(struct rte_vhost_memory *mem,
uint64_t gpa, uint64_t *len)
{
struct rte_vhost_mem_region *r;
uint32_t i;
for (i = 0; i < mem->nregions; i++) {
r = &mem->regions[i];
if (gpa >= r->guest_phys_addr &&
gpa < r->guest_phys_addr + r->size) {
if (unlikely(*len > r->guest_phys_addr + r->size - gpa))
*len = r->guest_phys_addr + r->size - gpa;
return gpa - r->guest_phys_addr +
r->host_user_addr;
}
}
*len = 0;
return 0;
}
#define RTE_VHOST_NEED_LOG(features) ((features) & (1ULL << VHOST_F_LOG_ALL)) #define RTE_VHOST_NEED_LOG(features) ((features) & (1ULL << VHOST_F_LOG_ALL))
/** /**