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xen/virtio: enable grant based virtio on x86 

Use an x86-specific virtio_check_mem_acc_cb() for Xen in order to setup
the correct DMA ops.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # common code
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2022-08-29 13:26:08 +02:00
parent 7228113d1f
commit 61367688f1
4 changed files with 19 additions and 3 deletions
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2
arch/x86/xen/enlighten_hvm.c
View File

@ -212,7 +212,7 @@ static void __init xen_hvm_guest_init(void)
return;
if (IS_ENABLED(CONFIG_XEN_VIRTIO_FORCE_GRANT))
virtio_set_mem_acc_cb(virtio_require_restricted_mem_acc);
virtio_set_mem_acc_cb(xen_virtio_restricted_mem_acc);
init_hvm_pv_info();

2
arch/x86/xen/enlighten_pv.c
View File

@ -112,7 +112,7 @@ static void __init xen_pv_init_platform(void)
{
/* PV guests can't operate virtio devices without grants. */
if (IS_ENABLED(CONFIG_XEN_VIRTIO))
virtio_set_mem_acc_cb(virtio_require_restricted_mem_acc);
virtio_set_mem_acc_cb(xen_virtio_restricted_mem_acc);
populate_extra_pte(fix_to_virt(FIX_PARAVIRT_BOOTMAP));

12
drivers/xen/grant-dma-ops.c
View File

@ -313,7 +313,7 @@ bool xen_is_grant_dma_device(struct device *dev)
bool xen_virtio_mem_acc(struct virtio_device *dev)
{
if (IS_ENABLED(CONFIG_XEN_VIRTIO_FORCE_GRANT))
if (IS_ENABLED(CONFIG_XEN_VIRTIO_FORCE_GRANT) || xen_pv_domain())
return true;
return xen_is_grant_dma_device(dev->dev.parent);
@ -387,6 +387,16 @@ void xen_grant_setup_dma_ops(struct device *dev)
dev_err(dev, "Cannot set up Xen grant DMA ops, retain platform DMA ops\n");
}
bool xen_virtio_restricted_mem_acc(struct virtio_device *dev)
{
bool ret = xen_virtio_mem_acc(dev);
if (ret)
xen_grant_setup_dma_ops(dev->dev.parent);
return ret;
}
MODULE_DESCRIPTION("Xen grant DMA-mapping layer");
MODULE_AUTHOR("Juergen Gross <jgross@suse.com>");
MODULE_LICENSE("GPL");

6
include/xen/xen-ops.h
View File

@ -219,6 +219,7 @@ static inline void xen_preemptible_hcall_end(void) { }
void xen_grant_setup_dma_ops(struct device *dev);
bool xen_is_grant_dma_device(struct device *dev);
bool xen_virtio_mem_acc(struct virtio_device *dev);
bool xen_virtio_restricted_mem_acc(struct virtio_device *dev);
#else
static inline void xen_grant_setup_dma_ops(struct device *dev)
{
@ -234,6 +235,11 @@ static inline bool xen_virtio_mem_acc(struct virtio_device *dev)
{
return false;
}
static inline bool xen_virtio_restricted_mem_acc(struct virtio_device *dev)
{
return false;
}
#endif /* CONFIG_XEN_GRANT_DMA_OPS */
#endif /* INCLUDE_XEN_OPS_H */