mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 01:56:40 +07:00
157 lines
3.4 KiB
C
157 lines
3.4 KiB
C
|
/*
|
||
|
* KVM coalesced MMIO
|
||
|
*
|
||
|
* Copyright (c) 2008 Bull S.A.S.
|
||
|
*
|
||
|
* Author: Laurent Vivier <Laurent.Vivier@bull.net>
|
||
|
*
|
||
|
*/
|
||
|
|
||
|
#include "iodev.h"
|
||
|
|
||
|
#include <linux/kvm_host.h>
|
||
|
#include <linux/kvm.h>
|
||
|
|
||
|
#include "coalesced_mmio.h"
|
||
|
|
||
|
static int coalesced_mmio_in_range(struct kvm_io_device *this,
|
||
|
gpa_t addr, int len, int is_write)
|
||
|
{
|
||
|
struct kvm_coalesced_mmio_dev *dev =
|
||
|
(struct kvm_coalesced_mmio_dev*)this->private;
|
||
|
struct kvm_coalesced_mmio_zone *zone;
|
||
|
int next;
|
||
|
int i;
|
||
|
|
||
|
if (!is_write)
|
||
|
return 0;
|
||
|
|
||
|
/* kvm->lock is taken by the caller and must be not released before
|
||
|
* dev.read/write
|
||
|
*/
|
||
|
|
||
|
/* Are we able to batch it ? */
|
||
|
|
||
|
/* last is the first free entry
|
||
|
* check if we don't meet the first used entry
|
||
|
* there is always one unused entry in the buffer
|
||
|
*/
|
||
|
|
||
|
next = (dev->kvm->coalesced_mmio_ring->last + 1) %
|
||
|
KVM_COALESCED_MMIO_MAX;
|
||
|
if (next == dev->kvm->coalesced_mmio_ring->first) {
|
||
|
/* full */
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* is it in a batchable area ? */
|
||
|
|
||
|
for (i = 0; i < dev->nb_zones; i++) {
|
||
|
zone = &dev->zone[i];
|
||
|
|
||
|
/* (addr,len) is fully included in
|
||
|
* (zone->addr, zone->size)
|
||
|
*/
|
||
|
|
||
|
if (zone->addr <= addr &&
|
||
|
addr + len <= zone->addr + zone->size)
|
||
|
return 1;
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void coalesced_mmio_write(struct kvm_io_device *this,
|
||
|
gpa_t addr, int len, const void *val)
|
||
|
{
|
||
|
struct kvm_coalesced_mmio_dev *dev =
|
||
|
(struct kvm_coalesced_mmio_dev*)this->private;
|
||
|
struct kvm_coalesced_mmio_ring *ring = dev->kvm->coalesced_mmio_ring;
|
||
|
|
||
|
/* kvm->lock must be taken by caller before call to in_range()*/
|
||
|
|
||
|
/* copy data in first free entry of the ring */
|
||
|
|
||
|
ring->coalesced_mmio[ring->last].phys_addr = addr;
|
||
|
ring->coalesced_mmio[ring->last].len = len;
|
||
|
memcpy(ring->coalesced_mmio[ring->last].data, val, len);
|
||
|
smp_wmb();
|
||
|
ring->last = (ring->last + 1) % KVM_COALESCED_MMIO_MAX;
|
||
|
}
|
||
|
|
||
|
static void coalesced_mmio_destructor(struct kvm_io_device *this)
|
||
|
{
|
||
|
kfree(this);
|
||
|
}
|
||
|
|
||
|
int kvm_coalesced_mmio_init(struct kvm *kvm)
|
||
|
{
|
||
|
struct kvm_coalesced_mmio_dev *dev;
|
||
|
|
||
|
dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev), GFP_KERNEL);
|
||
|
if (!dev)
|
||
|
return -ENOMEM;
|
||
|
dev->dev.write = coalesced_mmio_write;
|
||
|
dev->dev.in_range = coalesced_mmio_in_range;
|
||
|
dev->dev.destructor = coalesced_mmio_destructor;
|
||
|
dev->dev.private = dev;
|
||
|
dev->kvm = kvm;
|
||
|
kvm->coalesced_mmio_dev = dev;
|
||
|
kvm_io_bus_register_dev(&kvm->mmio_bus, &dev->dev);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
|
||
|
struct kvm_coalesced_mmio_zone *zone)
|
||
|
{
|
||
|
struct kvm_coalesced_mmio_dev *dev = kvm->coalesced_mmio_dev;
|
||
|
|
||
|
if (dev == NULL)
|
||
|
return -EINVAL;
|
||
|
|
||
|
mutex_lock(&kvm->lock);
|
||
|
if (dev->nb_zones >= KVM_COALESCED_MMIO_ZONE_MAX) {
|
||
|
mutex_unlock(&kvm->lock);
|
||
|
return -ENOBUFS;
|
||
|
}
|
||
|
|
||
|
dev->zone[dev->nb_zones] = *zone;
|
||
|
dev->nb_zones++;
|
||
|
|
||
|
mutex_unlock(&kvm->lock);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
|
||
|
struct kvm_coalesced_mmio_zone *zone)
|
||
|
{
|
||
|
int i;
|
||
|
struct kvm_coalesced_mmio_dev *dev = kvm->coalesced_mmio_dev;
|
||
|
struct kvm_coalesced_mmio_zone *z;
|
||
|
|
||
|
if (dev == NULL)
|
||
|
return -EINVAL;
|
||
|
|
||
|
mutex_lock(&kvm->lock);
|
||
|
|
||
|
i = dev->nb_zones;
|
||
|
while(i) {
|
||
|
z = &dev->zone[i - 1];
|
||
|
|
||
|
/* unregister all zones
|
||
|
* included in (zone->addr, zone->size)
|
||
|
*/
|
||
|
|
||
|
if (zone->addr <= z->addr &&
|
||
|
z->addr + z->size <= zone->addr + zone->size) {
|
||
|
dev->nb_zones--;
|
||
|
*z = dev->zone[dev->nb_zones];
|
||
|
}
|
||
|
i--;
|
||
|
}
|
||
|
|
||
|
mutex_unlock(&kvm->lock);
|
||
|
|
||
|
return 0;
|
||
|
}
|