Re: [PATCH v6 1/3] x86/iommu: remove regions not to be mapped

[Paul Durrant <xadimgnik@xxxxxxxxx>]

On 25/01/2024 13:26, Roger Pau Monne wrote:
> Introduce the code to remove regions not to be mapped from the rangeset
> that will be used to setup the IOMMU page tables for the hardware domain.
>
> This change also introduces two new functions: remove_xen_ranges() and
> vpci_subtract_mmcfg() that copy the logic in xen_in_range() and
> vpci_is_mmcfg_address() respectively and remove the ranges that would otherwise
> be intercepted by the original functions.
>
> Note that the rangeset is still not populated.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> ---
> Changes since v6:
>   - Fix subtraction to be done against the address, not the mfn.
>
> Changes since v4:
>   - Fix off-by-one when removing the Xen used ranges, as the rangesets are
>     inclusive.
>
> Changes since v3:
>   - Remove unnecessary line wrapping.
>
> Changes since v1:
>   - Split from bigger patch.
> ---
>   xen/arch/x86/hvm/io.c               | 16 ++++++++
>   xen/arch/x86/include/asm/hvm/io.h   |  3 ++
>   xen/arch/x86/include/asm/setup.h    |  1 +
>   xen/arch/x86/setup.c                | 48 +++++++++++++++++++++++
>   xen/drivers/passthrough/x86/iommu.c | 61 +++++++++++++++++++++++++++++
>   5 files changed, 129 insertions(+)
Reviewed-by: Paul Durrant <paul@xxxxxxx>