[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging-4.16] x86/irq: skip unmap_domain_pirq XSM during destruction
commit b58fb6e81bd55b6bd946abc3070770f7994c9ef9 Author: Jason Andryuk <jandryuk@xxxxxxxxx> AuthorDate: Tue Jun 7 13:55:39 2022 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Tue Jun 7 13:55:39 2022 +0200 x86/irq: skip unmap_domain_pirq XSM during destruction xsm_unmap_domain_irq was seen denying unmap_domain_pirq when called from complete_domain_destroy as an RCU callback. The source context was an unexpected, random domain. Since this is a xen-internal operation, going through the XSM hook is inapproriate. Check d->is_dying and skip the XSM hook when set since this is a cleanup operation for a domain being destroyed. Suggested-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> master commit: 2e6f95a942d1927a53f077c301db0b799c54c05a master date: 2022-04-08 14:51:52 +0200 --- xen/arch/x86/irq.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c index 67cbf6b979..47b86af5dc 100644 --- a/xen/arch/x86/irq.c +++ b/xen/arch/x86/irq.c @@ -2342,8 +2342,14 @@ int unmap_domain_pirq(struct domain *d, int pirq) nr = msi_desc->msi.nvec; } - ret = xsm_unmap_domain_irq(XSM_HOOK, d, irq, - msi_desc ? msi_desc->dev : NULL); + /* + * When called by complete_domain_destroy via RCU, current is a random + * domain. Skip the XSM check since this is a Xen-initiated action. + */ + if ( !d->is_dying ) + ret = xsm_unmap_domain_irq(XSM_HOOK, d, irq, + msi_desc ? msi_desc->dev : NULL); + if ( ret ) goto done; -- generated by git-patchbot for /home/xen/git/xen.git#staging-4.16
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