Booting with Shadow Stacks leads to the following assert on a debug hypervisor:
(XEN) [ 11.625166] Assertion 'local_irq_is_enabled()' failed at arch/x86/smp.c:265 (XEN) [ 11.629410] ----[ Xen-4.17.0-10.24-d x86_64 debug=y Not tainted ]---- (XEN) [ 11.633679] CPU: 0 (XEN) [ 11.637834] RIP: e008:[<ffff82d040345300>] flush_area_mask+0x40/0x13e [...] (XEN) [ 11.806158] Xen call trace: (XEN) [ 11.811255] [<ffff82d040345300>] R flush_area_mask+0x40/0x13e (XEN) [ 11.816459] [<ffff82d040338a40>] F modify_xen_mappings+0xc5/0x958 (XEN) [ 11.821689] [<ffff82d0404474f9>] F arch/x86/alternative.c#_alternative_instructions+0xb7/0xb9 (XEN) [ 11.827053] [<ffff82d0404476cc>] F alternative_branches+0xf/0x12 (XEN) [ 11.832416] [<ffff82d04044e37d>] F __start_xen+0x1ef4/0x2776 (XEN) [ 11.837809] [<ffff82d040203344>] F __high_start+0x94/0xa0 Fix this by switching to state SYS_STATE_smp_boot after alternatives have been applied. Fixes: (78e072bc37 'x86/mm: avoid inadvertently degrading a TLB flush to local only') Signed-off-by: Roger Pau Monné <[email protected]> --- xen/arch/x86/setup.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c index 53a73010e0..318f02f6ae 100644 --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -1853,12 +1853,12 @@ void __init noreturn __start_xen(unsigned long mbi_p) console_init_postirq(); - system_state = SYS_STATE_smp_boot; - do_presmp_initcalls(); alternative_branches(); + system_state = SYS_STATE_smp_boot; + /* * NB: when running as a PV shim VCPUOP_up/down is wired to the shim * physical cpu_add/remove functions, so launch the guest with only -- 2.36.0
