Commit b36b0fe9 authored by David Woodhouse's avatar David Woodhouse Committed by Juergen Gross

x86/xen: Add xen_no_vector_callback option to test PCI INTX delivery

It's useful to be able to test non-vector event channel delivery, to make
sure Linux will work properly on older Xen which doesn't have it.

It's also useful for those working on Xen and Xen-compatible hypervisors,
because there are guest kernels still in active use which use PCI INTX
even when vector delivery is available.
Signed-off-by: default avatarDavid Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20210106153958.584169-4-dwmw2@infradead.orgSigned-off-by: default avatarJuergen Gross <jgross@suse.com>
parent 8f4fd86a
......@@ -5964,6 +5964,10 @@
This option is obsoleted by the "nopv" option, which
has equivalent effect for XEN platform.
xen_no_vector_callback
[KNL,X86,XEN] Disable the vector callback for Xen
event channel interrupts.
xen_scrub_pages= [XEN]
Boolean option to control scrubbing pages before giving them back
to Xen, for use by other domains. Can be also changed at runtime
......
......@@ -188,6 +188,8 @@ static int xen_cpu_dead_hvm(unsigned int cpu)
return 0;
}
static bool no_vector_callback __initdata;
static void __init xen_hvm_guest_init(void)
{
if (xen_pv_domain())
......@@ -207,7 +209,7 @@ static void __init xen_hvm_guest_init(void)
xen_panic_handler_init();
if (xen_feature(XENFEAT_hvm_callback_vector))
if (!no_vector_callback && xen_feature(XENFEAT_hvm_callback_vector))
xen_have_vector_callback = 1;
xen_hvm_smp_init();
......@@ -233,6 +235,13 @@ static __init int xen_parse_nopv(char *arg)
}
early_param("xen_nopv", xen_parse_nopv);
static __init int xen_parse_no_vector_callback(char *arg)
{
no_vector_callback = true;
return 0;
}
early_param("xen_no_vector_callback", xen_parse_no_vector_callback);
bool __init xen_hvm_need_lapic(void)
{
if (xen_pv_domain())
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment