xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE

Browse Source 
My recent Xen patch series introduces a new HYPERVISOR_memory_op to
support direct priv-mapping of certain guest resources (such as ioreq
pages, used by emulators) by a tools domain, rather than having to access
such resources via the guest P2M.

This patch adds the necessary infrastructure to the privcmd driver and
Xen MMU code to support direct resource mapping.

NOTE: The adjustment in the MMU code is partially cosmetic. Xen will now
      allow a PV tools domain to map guest pages either by GFN or MFN, thus
      the term 'mfn' has been swapped for 'pfn' in the lower layers of the
      remap code.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Paul Durrant
2018-05-09 14:16:12 +01:00
committed by Juergen Gross
parent 4bf2cc9645
commit 3ad0876554
7 changed files with 291 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
include/uapi/xen/privcmd.h
View File

@@ -89,6 +89,15 @@ struct privcmd_dm_op {
const struct privcmd_dm_op_buf __user *ubufs;
};
struct privcmd_mmap_resource {
domid_t dom;
__u32 type;
__u32 id;
__u32 idx;
__u64 num;
__u64 addr;
};
/*
* @cmd: IOCTL_PRIVCMD_HYPERCALL
* @arg: &privcmd_hypercall_t
@@ -114,5 +123,7 @@ struct privcmd_dm_op {
_IOC(_IOC_NONE, 'P', 5, sizeof(struct privcmd_dm_op))
#define IOCTL_PRIVCMD_RESTRICT \
_IOC(_IOC_NONE, 'P', 6, sizeof(domid_t))
#define IOCTL_PRIVCMD_MMAP_RESOURCE \
_IOC(_IOC_NONE, 'P', 7, sizeof(struct privcmd_mmap_resource))
#endif /* __LINUX_PUBLIC_PRIVCMD_H__ */