Re: [Xen-devel] [PATCH v3 49/52] libxc: add function to set hypervisor parameters

[Wei Liu]

On Wed, Aug 16, 2017 at 02:52:16PM +0200, Juergen Gross wrote:
> Add a new libxc function to set hypervisor parameters at runtime
> similar to boot time parameters via command line.
> 
> Cc: Ian Jackson 
> Cc: Wei Liu 
> Signed-off-by: Juergen Gross 

Acked-by: Wei Liu 

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[Xen-devel] [PATCH v3 49/52] libxc: add function to set hypervisor parameters

[Juergen Gross]

Add a new libxc function to set hypervisor parameters at runtime
similar to boot time parameters via command line.

Cc: Ian Jackson 
Cc: Wei Liu 
Signed-off-by: Juergen Gross 
---
V3:
- zero padding fields in sysctl.u.set_parameter
---
 tools/libxc/include/xenctrl.h |  1 +
 tools/libxc/xc_misc.c | 21 +
 2 files changed, 22 insertions(+)

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index c7710b8f36..ad5e6b3d77 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -1210,6 +1210,7 @@ int xc_readconsolering(xc_interface *xch,
int clear, int incremental, uint32_t *pindex);
 
 int xc_send_debug_keys(xc_interface *xch, char *keys);
+int xc_set_parameters(xc_interface *xch, char *params);
 
 typedef xen_sysctl_physinfo_t xc_physinfo_t;
 typedef xen_sysctl_cputopo_t xc_cputopo_t;
diff --git a/tools/libxc/xc_misc.c b/tools/libxc/xc_misc.c
index 2303293c6c..7e15e904e3 100644
--- a/tools/libxc/xc_misc.c
+++ b/tools/libxc/xc_misc.c
@@ -187,6 +187,27 @@ int xc_send_debug_keys(xc_interface *xch, char *keys)
 return ret;
 }
 
+int xc_set_parameters(xc_interface *xch, char *params)
+{
+int ret, len = strlen(params);
+DECLARE_SYSCTL;
+DECLARE_HYPERCALL_BOUNCE(params, len, XC_HYPERCALL_BUFFER_BOUNCE_IN);
+
+if ( xc_hypercall_bounce_pre(xch, params) )
+return -1;
+
+sysctl.cmd = XEN_SYSCTL_set_parameter;
+set_xen_guest_handle(sysctl.u.set_parameter.params, params);
+sysctl.u.set_parameter.size = len;
+memset(sysctl.u.set_parameter.pad, 0, sizeof(sysctl.u.set_parameter.pad));
+
+ret = do_sysctl(xch, );
+
+xc_hypercall_bounce_post(xch, params);
+
+return ret;
+}
+
 int xc_physinfo(xc_interface *xch,
 xc_physinfo_t *put_info)
 {
-- 
2.12.3


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