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xen: use errno instead of rc for xc_domain_add_to_physmap

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In Xen 4.6 commit cd2f100f0f61b3f333d52d1737dd73f02daee592
"libxc: Fix do_memory_op to return negative value on errors"
made the libxc API less odd-ball: On errors, return value is
-1 and error code is in errno. On success the return value
is either 0 or an positive value.

Since we could be running with an old toolstack in which the
Exx value is in rc or the newer, we add an wrapper around
the xc_domain_add_to_physmap (called xen_xc_domain_add_to_physmap)
which will always return the EXX.

Xen 4.6 did not change the libxc functions mentioned (same parameters)
so we piggyback on the fact that Xen 4.6 has a new function:
commit 504ed2053362381ac01b98db9313454488b7db40 "tools/libxc: Expose
new hypercall xc_reserved_device_memory_map" and check for that.

Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Suggested-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2015-06-29 12:51:05 -04:00 • committed by Stefano Stabellini
parent 52c7265f60
commit 20a544c7dc
3 changed files with 25 additions and 2 deletions
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22
include/hw/xen/xen_common.h
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@ -417,4 +417,26 @@ static inline int xen_set_ioreq_server_state(XenXC xc, domid_t dom,
#endif
#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 460
static inline int xen_xc_domain_add_to_physmap(XenXC xch, uint32_t domid,
unsigned int space,
unsigned long idx,
xen_pfn_t gpfn)
{
return xc_domain_add_to_physmap(xch, domid, space, idx, gpfn);
}
#else
static inline int xen_xc_domain_add_to_physmap(XenXC xch, uint32_t domid,
unsigned int space,
unsigned long idx,
xen_pfn_t gpfn)
{
/* In Xen 4.6 rc is -1 and errno contains the error value. */
int rc = xc_domain_add_to_physmap(xch, domid, space, idx, gpfn);
if (rc == -1)
return errno;
return rc;
}
#endif
#endif /* QEMU_HW_XEN_COMMON_H */