Commit e30595fb authored by Dariusz Stojaczyk's avatar Dariusz Stojaczyk Committed by Daniel Verkamp
Browse files

rte_vhost: introduce safe API for GPA translation 



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: default avatarYongji Xie <xieyongji@baidu.com>
Signed-off-by: default avatarMaxime Coquelin <maxime.coquelin@redhat.com>
Signed-off-by: default avatarDariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/408720


Reviewed-by: default avatarDaniel Verkamp <daniel.verkamp@intel.com>
Tested-by: default avatarSPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: default avatarJim Harris <james.r.harris@intel.com>
parent f9fae3f3

lib/vhost/rte_vhost/rte_vhost.h

+40 −0
Original line number Diff line number Diff line
@@ -146,6 +146,46 @@ rte_vhost_gpa_to_vva(struct rte_vhost_memory *mem, uint64_t gpa) 
	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))



/**