The following commit has been merged into the x86/urgent branch of tip:

Commit-ID: 7e0815b3e09986d2fe651199363e135b9358132a Gitweb: https://git.kernel.org/tip/7e0815b3e09986d2fe651199363e135b9358132a Author: Thomas Gleixner tglx@linutronix.de AuthorDate: Thu, 28 Apr 2022 15:50:54 +02:00 Committer: Thomas Gleixner tglx@linutronix.de CommitterDate: Fri, 29 Apr 2022 14:37:39 +02:00

x86/pci/xen: Disable PCI/MSI[-X] masking for XEN_HVM guests

When a XEN_HVM guest uses the XEN PIRQ/Eventchannel mechanism, then PCI/MSI[-X] masking is solely controlled by the hypervisor, but contrary to XEN_PV guests this does not disable PCI/MSI[-X] masking in the PCI/MSI layer.

This can lead to a situation where the PCI/MSI layer masks an MSI[-X] interrupt and the hypervisor grants the write despite the fact that it already requested the interrupt. As a consequence interrupt delivery on the affected device is not happening ever.

Set pci_msi_ignore_mask to prevent that like it's done for XEN_PV guests already.

Fixes: 809f9267bbab ("xen: map MSIs into pirqs") Reported-by: Jeremi Piotrowski jpiotrowski@linux.microsoft.com Reported-by: Dusty Mabe dustymabe@redhat.com Reported-by: Salvatore Bonaccorso carnil@debian.org Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Noah Meyerhans noahm@debian.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/87tuaduxj5.ffs@tglx

--- arch/x86/pci/xen.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c index 9bb1e29..b94f727 100644 --- a/arch/x86/pci/xen.c +++ b/arch/x86/pci/xen.c @@ -467,7 +467,6 @@ static __init void xen_setup_pci_msi(void) else xen_msi_ops.setup_msi_irqs = xen_setup_msi_irqs; xen_msi_ops.teardown_msi_irqs = xen_pv_teardown_msi_irqs; - pci_msi_ignore_mask = 1; } else if (xen_hvm_domain()) { xen_msi_ops.setup_msi_irqs = xen_hvm_setup_msi_irqs; xen_msi_ops.teardown_msi_irqs = xen_teardown_msi_irqs; @@ -481,6 +480,11 @@ static __init void xen_setup_pci_msi(void) * in allocating the native domain and never use it. */ x86_init.irqs.create_pci_msi_domain = xen_create_pci_msi_domain; + /* + * With XEN PIRQ/Eventchannels in use PCI/MSI[-X] masking is solely + * controlled by the hypervisor. + */ + pci_msi_ignore_mask = 1; }

#else /* CONFIG_PCI_MSI */