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xen/privcmd: add PRIVCMD_MMAPBATCH_V2 ioctl

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PRIVCMD_MMAPBATCH_V2 extends PRIVCMD_MMAPBATCH with an additional
field for reporting the error code for every frame that could not be
mapped.  libxc prefers PRIVCMD_MMAPBATCH_V2 over PRIVCMD_MMAPBATCH.

Also expand PRIVCMD_MMAPBATCH to return appropriate error-encoding top nibble
in the mfn array.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Andres Lagar-Cavilla
2012-08-31 09:59:30 -04:00
committed by Konrad Rzeszutek Wilk
parent 69870a8478
commit ceb90fa0a8
2 changed files with 121 additions and 29 deletions
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24
include/xen/privcmd.h
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@@ -58,13 +58,33 @@ struct privcmd_mmapbatch {
int num; /* number of pages to populate */
domid_t dom; /* target domain */
__u64 addr; /* virtual address */
xen_pfn_t __user *arr; /* array of mfns - top nibble set on err */
xen_pfn_t __user *arr; /* array of mfns - or'd with
PRIVCMD_MMAPBATCH_*_ERROR on err */
};
#define PRIVCMD_MMAPBATCH_MFN_ERROR 0xf0000000U
#define PRIVCMD_MMAPBATCH_PAGED_ERROR 0x80000000U
struct privcmd_mmapbatch_v2 {
unsigned int num; /* number of pages to populate */
domid_t dom; /* target domain */
__u64 addr; /* virtual address */
const xen_pfn_t __user *arr; /* array of mfns */
int __user *err; /* array of error codes */
};
/*
* @cmd: IOCTL_PRIVCMD_HYPERCALL
* @arg: &privcmd_hypercall_t
* Return: Value returned from execution of the specified hypercall.
*
* @cmd: IOCTL_PRIVCMD_MMAPBATCH_V2
* @arg: &struct privcmd_mmapbatch_v2
* Return: 0 on success (i.e., arg->err contains valid error codes for
* each frame). On an error other than a failed frame remap, -1 is
* returned and errno is set to EINVAL, EFAULT etc. As an exception,
* if the operation was otherwise successful but any frame failed with
* -ENOENT, then -1 is returned and errno is set to ENOENT.
*/
#define IOCTL_PRIVCMD_HYPERCALL \
_IOC(_IOC_NONE, 'P', 0, sizeof(struct privcmd_hypercall))
@@ -72,5 +92,7 @@ struct privcmd_mmapbatch {
_IOC(_IOC_NONE, 'P', 2, sizeof(struct privcmd_mmap))
#define IOCTL_PRIVCMD_MMAPBATCH \
_IOC(_IOC_NONE, 'P', 3, sizeof(struct privcmd_mmapbatch))
#define IOCTL_PRIVCMD_MMAPBATCH_V2 \
_IOC(_IOC_NONE, 'P', 4, sizeof(struct privcmd_mmapbatch_v2))
#endif /* __LINUX_PUBLIC_PRIVCMD_H__ */