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Re: [PATCH] arm/vgic-v3: Fix write_ignore_64's check in __vgic_v3_rdistr_rd_mmio_write()
- To: Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 20 May 2025 15:24:43 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Tue, 20 May 2025 14:25:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20/05/2025 2:47 pm, Oleksandr Tyshchenko wrote:
> An attempt to write access the register (i.e. GICR_PROPBASER, GICR_PENDBASER)
> which should be ignored (i.e. no virtual ITS present) causes the data about
Do you mean "data abort" here? If not, I can't parse the sentence.
> due to incorrect check at the write_ignore_64 label. The check should be
> inverted.
>
> Fixes: c4d6bbdc12e5 ("xen/arm: vgic-v3: Support 32-bit access for 64-bit
> registers")
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
> ---
> xen/arch/arm/vgic-v3.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/xen/arch/arm/vgic-v3.c b/xen/arch/arm/vgic-v3.c
> index 2eaa48fadb..b366b046a2 100644
> --- a/xen/arch/arm/vgic-v3.c
> +++ b/xen/arch/arm/vgic-v3.c
> @@ -649,7 +649,7 @@ bad_width:
> return 0;
>
> write_ignore_64:
> - if ( vgic_reg64_check_access(dabt) ) goto bad_width;
> + if ( !vgic_reg64_check_access(dabt) ) goto bad_width;
As you're modifying anyway, the goto should be on the next line.
~Andrew
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