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3ad0876554
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>
130 lines
4.2 KiB
C
130 lines
4.2 KiB
C
/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR MIT) */
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/******************************************************************************
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* privcmd.h
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*
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* Interface to /proc/xen/privcmd.
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*
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* Copyright (c) 2003-2005, K A Fraser
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __LINUX_PUBLIC_PRIVCMD_H__
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#define __LINUX_PUBLIC_PRIVCMD_H__
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <xen/interface/xen.h>
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struct privcmd_hypercall {
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__u64 op;
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__u64 arg[5];
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};
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struct privcmd_mmap_entry {
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__u64 va;
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/*
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* This should be a GFN. It's not possible to change the name because
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* it's exposed to the user-space.
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*/
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__u64 mfn;
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__u64 npages;
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};
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struct privcmd_mmap {
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int num;
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domid_t dom; /* target domain */
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struct privcmd_mmap_entry __user *entry;
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};
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struct privcmd_mmapbatch {
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int num; /* number of pages to populate */
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domid_t dom; /* target domain */
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__u64 addr; /* virtual address */
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xen_pfn_t __user *arr; /* array of mfns - or'd with
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PRIVCMD_MMAPBATCH_*_ERROR on err */
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};
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#define PRIVCMD_MMAPBATCH_MFN_ERROR 0xf0000000U
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#define PRIVCMD_MMAPBATCH_PAGED_ERROR 0x80000000U
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struct privcmd_mmapbatch_v2 {
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unsigned int num; /* number of pages to populate */
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domid_t dom; /* target domain */
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__u64 addr; /* virtual address */
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const xen_pfn_t __user *arr; /* array of mfns */
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int __user *err; /* array of error codes */
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};
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struct privcmd_dm_op_buf {
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void __user *uptr;
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size_t size;
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};
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struct privcmd_dm_op {
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domid_t dom;
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__u16 num;
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const struct privcmd_dm_op_buf __user *ubufs;
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};
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struct privcmd_mmap_resource {
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domid_t dom;
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__u32 type;
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__u32 id;
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__u32 idx;
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__u64 num;
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__u64 addr;
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};
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/*
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* @cmd: IOCTL_PRIVCMD_HYPERCALL
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* @arg: &privcmd_hypercall_t
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* Return: Value returned from execution of the specified hypercall.
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*
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* @cmd: IOCTL_PRIVCMD_MMAPBATCH_V2
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* @arg: &struct privcmd_mmapbatch_v2
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* Return: 0 on success (i.e., arg->err contains valid error codes for
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* each frame). On an error other than a failed frame remap, -1 is
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* returned and errno is set to EINVAL, EFAULT etc. As an exception,
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* if the operation was otherwise successful but any frame failed with
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* -ENOENT, then -1 is returned and errno is set to ENOENT.
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*/
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#define IOCTL_PRIVCMD_HYPERCALL \
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_IOC(_IOC_NONE, 'P', 0, sizeof(struct privcmd_hypercall))
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#define IOCTL_PRIVCMD_MMAP \
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_IOC(_IOC_NONE, 'P', 2, sizeof(struct privcmd_mmap))
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#define IOCTL_PRIVCMD_MMAPBATCH \
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_IOC(_IOC_NONE, 'P', 3, sizeof(struct privcmd_mmapbatch))
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#define IOCTL_PRIVCMD_MMAPBATCH_V2 \
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_IOC(_IOC_NONE, 'P', 4, sizeof(struct privcmd_mmapbatch_v2))
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#define IOCTL_PRIVCMD_DM_OP \
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_IOC(_IOC_NONE, 'P', 5, sizeof(struct privcmd_dm_op))
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#define IOCTL_PRIVCMD_RESTRICT \
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_IOC(_IOC_NONE, 'P', 6, sizeof(domid_t))
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#define IOCTL_PRIVCMD_MMAP_RESOURCE \
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_IOC(_IOC_NONE, 'P', 7, sizeof(struct privcmd_mmap_resource))
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#endif /* __LINUX_PUBLIC_PRIVCMD_H__ */
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