Re: [PATCH v4 2/3] xen/arm: gic: acpi: Use the correct length for the GICC structure

[Bertrand Marquis <Bertrand.Marquis@xxxxxxx>]

Hi,

> On 19 Nov 2020, at 17:08, Julien Grall <julien@xxxxxxx> wrote:
> 
> From: Julien Grall <julien.grall@xxxxxxx>
> 
> The length of the GICC structure in the MADT ACPI table differs between
> version 5.1 and 6.0, although there are no other relevant differences.
> 
> Use the BAD_MADT_GICC_ENTRY macro, which was specifically designed to
> overcome this issue.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>

Cheers
Bertrand

> 
> ---
>    Changes in v3:
>        - Update the commit title as we also modify GICv3 code
>        - Use the correct length in more places
> 
>    Changes in v2:
>        - Patch added
> ---
> xen/arch/arm/acpi/boot.c | 2 +-
> xen/arch/arm/gic-v2.c    | 5 +++--
> xen/arch/arm/gic-v3.c    | 6 +++---
> xen/arch/arm/gic.c       | 2 +-
> 4 files changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c
> index 30e4bd1bc5a7..55c3e5cbc834 100644
> --- a/xen/arch/arm/acpi/boot.c
> +++ b/xen/arch/arm/acpi/boot.c
> @@ -131,7 +131,7 @@ acpi_parse_gic_cpu_interface(struct acpi_subtable_header 
> *header,
>     struct acpi_madt_generic_interrupt *processor =
>                container_of(header, struct acpi_madt_generic_interrupt, 
> header);
> 
> -    if ( BAD_MADT_ENTRY(processor, end) )
> +    if ( BAD_MADT_GICC_ENTRY(processor, end) )
>         return -EINVAL;
> 
>     acpi_table_print_madt_entry(header);
> diff --git a/xen/arch/arm/gic-v2.c b/xen/arch/arm/gic-v2.c
> index 581ea5ba6b2c..b2adc8ec9a64 100644
> --- a/xen/arch/arm/gic-v2.c
> +++ b/xen/arch/arm/gic-v2.c
> @@ -1136,7 +1136,8 @@ static int gicv2_make_hwdom_madt(const struct domain 
> *d, u32 offset)
> 
>     host_gicc = container_of(header, struct acpi_madt_generic_interrupt,
>                              header);
> -    size = sizeof(struct acpi_madt_generic_interrupt);
> +
> +    size = ACPI_MADT_GICC_LENGTH;
>     /* Add Generic Interrupt */
>     for ( i = 0; i < d->max_vcpus; i++ )
>     {
> @@ -1165,7 +1166,7 @@ gic_acpi_parse_madt_cpu(struct acpi_subtable_header 
> *header,
>     struct acpi_madt_generic_interrupt *processor =
>                container_of(header, struct acpi_madt_generic_interrupt, 
> header);
> 
> -    if ( BAD_MADT_ENTRY(processor, end) )
> +    if ( BAD_MADT_GICC_ENTRY(processor, end) )
>         return -EINVAL;
> 
>     /* Read from APIC table and fill up the GIC variables */
> diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
> index 2a344393a0e4..ac28013c1967 100644
> --- a/xen/arch/arm/gic-v3.c
> +++ b/xen/arch/arm/gic-v3.c
> @@ -1499,7 +1499,7 @@ static int gicv3_make_hwdom_madt(const struct domain 
> *d, u32 offset)
> 
>     host_gicc = container_of(header, struct acpi_madt_generic_interrupt,
>                              header);
> -    size = sizeof(struct acpi_madt_generic_interrupt);
> +    size = ACPI_MADT_GICC_LENGTH;
>     for ( i = 0; i < d->max_vcpus; i++ )
>     {
>         gicc = (struct acpi_madt_generic_interrupt *)(base_ptr + table_len);
> @@ -1558,7 +1558,7 @@ gic_acpi_parse_madt_cpu(struct acpi_subtable_header 
> *header,
>     struct acpi_madt_generic_interrupt *processor =
>                container_of(header, struct acpi_madt_generic_interrupt, 
> header);
> 
> -    if ( BAD_MADT_ENTRY(processor, end) )
> +    if ( BAD_MADT_GICC_ENTRY(processor, end) )
>         return -EINVAL;
> 
>     /* Read from APIC table and fill up the GIC variables */
> @@ -1628,7 +1628,7 @@ gic_acpi_get_madt_cpu_num(struct acpi_subtable_header 
> *header,
>     struct acpi_madt_generic_interrupt *cpuif;
> 
>     cpuif = (struct acpi_madt_generic_interrupt *)header;
> -    if ( BAD_MADT_ENTRY(cpuif, end) || !cpuif->gicr_base_address )
> +    if ( BAD_MADT_GICC_ENTRY(cpuif, end) || !cpuif->gicr_base_address )
>         return -EINVAL;
> 
>     return 0;
> diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
> index fe60619e99cf..3b0331b53830 100644
> --- a/xen/arch/arm/gic.c
> +++ b/xen/arch/arm/gic.c
> @@ -454,7 +454,7 @@ unsigned long gic_get_hwdom_madt_size(const struct domain 
> *d)
>     unsigned long madt_size;
> 
>     madt_size = sizeof(struct acpi_table_madt)
> -                + sizeof(struct acpi_madt_generic_interrupt) * d->max_vcpus
> +                + ACPI_MADT_GICC_LENGTH * d->max_vcpus
>                 + sizeof(struct acpi_madt_generic_distributor)
>                 + gic_hw_ops->get_hwdom_extra_madt_size(d);
> 
> -- 
> 2.17.1
>