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| author |   Dexuan Cui <decui@microsoft.com> | 2020-12-01 16:45:10 -0800 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2020-12-02 11:22:55 +0100 |
| commit | 26ab12bb9d96133b7880141d68b5e01a8783de9d (patch) | |
| tree | 04cade33b453c1433dc295c42b9ce0a8a2c20bb8 | |
| parent | iommu/amd: Fix IOMMU interrupt generation in X2APIC mode (diff) | |
| download | linux-dev-26ab12bb9d96133b7880141d68b5e01a8783de9d.tar.xz linux-dev-26ab12bb9d96133b7880141d68b5e01a8783de9d.zip | |
iommu/hyper-v: Remove I/O-APIC ID check from hyperv_irq_remapping_select()
commit a491bb19f728 ("iommu/hyper-v: Implement select() method on remapping
irqdomain") restricted the irq_domain_ops::select() callback to match on
I/O-APIC index 0, which was correct until the parameter was changed to
carry the I/O APIC ID in commit f36a74b9345a.
If the ID is not 0 then the match fails. Therefore I/O-APIC init fails to
retrieve the parent irqdomain for the I/O-APIC resulting in a boot panic:
kernel BUG at arch/x86/kernel/apic/io_apic.c:2408!
Fix it by matching the I/O-APIC independent of the ID as there is only one
I/O APIC emulated by Hyper-V.
[ tglx: Amended changelog ]
Fixes: f36a74b9345a ("x86/ioapic: Use I/O-APIC ID for finding irqdomain, not index")
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lore.kernel.org/r/20201202004510.1818-1-decui@microsoft.com
| -rw-r--r-- | drivers/iommu/hyperv-iommu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c index 9438daa24fdb..1d21a0b5f724 100644 --- a/drivers/iommu/hyperv-iommu.c +++ b/drivers/iommu/hyperv-iommu.c @@ -105,8 +105,8 @@ static int hyperv_irq_remapping_select(struct irq_domain *d, struct irq_fwspec *fwspec, enum irq_domain_bus_token bus_token) { - /* Claim only the first (and only) I/OAPIC */ - return x86_fwspec_is_ioapic(fwspec) && fwspec->param[0] == 0; + /* Claim the only I/O APIC emulated by Hyper-V */ + return x86_fwspec_is_ioapic(fwspec); } static const struct irq_domain_ops hyperv_ir_domain_ops = { |