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David Woodhouse authored
My virtual IOMMU implementation is whining that the guest is reading a register that doesn't exist. Only read the VCCAP_REG if the corresponding capability is set in ECAP_REG to indicate that it actually exists. Fixes: 3375303e ("iommu/vt-d: Add custom allocator for IOASID") Signed-off-by:
David Woodhouse <dwmw@amazon.co.uk> Reviewed-by:
Liu Yi L <yi.l.liu@intel.com> Cc: stable@vger.kernel.org # v5.7+ Acked-by:
Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/de32b150ffaa752e0cff8571b17dfb1213fbe71c.camel@infradead.orgSigned-off-by:
Will Deacon <will@kernel.org>
d76b42e9