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

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[ Upstream commit b36b0fe96af13460278bf9b173beced1bd15f85d ]

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: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20210106153958.584169-4-dwmw2@infradead.org
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Woodhouse 2021-01-06 15:39:56 +00:00 committed by Greg Kroah-Hartman
parent a09d4e7acd
commit 5fa6987258
2 changed files with 14 additions and 1 deletions
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4
Documentation/admin-guide/kernel-parameters.txt
View File

@ -5452,6 +5452,10 @@
This option is obsoleted by the "nopv" option, which This option is obsoleted by the "nopv" option, which
has equivalent effect for XEN platform. 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] xen_scrub_pages= [XEN]
Boolean option to control scrubbing pages before giving them back Boolean option to control scrubbing pages before giving them back
to Xen, for use by other domains. Can be also changed at runtime to Xen, for use by other domains. Can be also changed at runtime

11
arch/x86/xen/enlighten_hvm.c
View File

@ -175,6 +175,8 @@ static int xen_cpu_dead_hvm(unsigned int cpu)
return 0; return 0;
} }
static bool no_vector_callback __initdata;
static void __init xen_hvm_guest_init(void) static void __init xen_hvm_guest_init(void)
{ {
if (xen_pv_domain()) if (xen_pv_domain())
@ -194,7 +196,7 @@ static void __init xen_hvm_guest_init(void)
xen_panic_handler_init(); 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_have_vector_callback = 1;
xen_hvm_smp_init(); xen_hvm_smp_init();
@ -220,6 +222,13 @@ static __init int xen_parse_nopv(char *arg)
} }
early_param("xen_nopv", xen_parse_nopv); 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) bool __init xen_hvm_need_lapic(void)
{ {
if (xen_pv_domain()) if (xen_pv_domain())