Commit 1ca3dec2 authored by Cédric Le Goater's avatar Cédric Le Goater Committed by Michael Ellerman

powerpc/xive: Prevent page fault issues in the machine crash handler

When the machine crash handler is invoked, all interrupts are masked
but interrupts which have not been started yet do not have an ESB page
mapped in the Linux address space. This crashes the 'crash kexec'
sequence on sPAPR guests.

To fix, force the mapping of the ESB page when an interrupt is being
mapped in the Linux IRQ number space. This is done by setting the
initial state of the interrupt to OFF which is not necessarily the
case on PowerNV.

Fixes: 243e2511 ("powerpc/xive: Native exploitation of the XIVE interrupt controller")
Cc: stable@vger.kernel.org # v4.12+
Signed-off-by: default avatarCédric Le Goater <clg@kaod.org>
Reviewed-by: default avatarGreg Kurz <groug@kaod.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191031063100.3864-1-clg@kaod.org
parent 1db550f4
......@@ -1035,6 +1035,15 @@ static int xive_irq_alloc_data(unsigned int virq, irq_hw_number_t hw)
xd->target = XIVE_INVALID_TARGET;
irq_set_handler_data(virq, xd);
/*
* Turn OFF by default the interrupt being mapped. A side
* effect of this check is the mapping the ESB page of the
* interrupt in the Linux address space. This prevents page
* fault issues in the crash handler which masks all
* interrupts.
*/
xive_esb_read(xd, XIVE_ESB_SET_PQ_01);
return 0;
}
......
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