linux-kernel - Re: [PATCH v7 1/6] PCI: endpoint: Add dynamic_inbound

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aWao64gu48V6aD+n@lizhi-Precision-Tower-5810>
Date: Tue, 13 Jan 2026 15:19:55 -0500
From: Frank Li <Frank.li@....com>
To: Koichiro Den <den@...inux.co.jp>
Cc: jingoohan1@...il.com, mani@...nel.org, lpieralisi@...nel.org,
	kwilczynski@...nel.org, robh@...nel.org, bhelgaas@...gle.com,
	cassel@...nel.org, vigneshr@...com, s-vadapalli@...com,
	hongxing.zhu@....com, l.stach@...gutronix.de, shawnguo@...nel.org,
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
	minghuan.Lian@....com, mingkai.hu@....com, roy.zang@....com,
	jesper.nilsson@...s.com, heiko@...ech.de,
	srikanth.thokala@...el.com, marek.vasut+renesas@...il.com,
	yoshihiro.shimoda.uh@...esas.com, geert+renesas@...der.be,
	magnus.damm@...il.com, christian.bruel@...s.st.com,
	mcoquelin.stm32@...il.com, alexandre.torgue@...s.st.com,
	thierry.reding@...il.com, jonathanh@...dia.com,
	hayashi.kunihiko@...ionext.com, mhiramat@...nel.org,
	kishon@...nel.org, jirislaby@...nel.org, rongqianfeng@...o.com,
	18255117159@....com, shawn.lin@...k-chips.com,
	nicolas.frattaroli@...labora.com, linux.amoon@...il.com,
	vidyas@...dia.com, linux-omap@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
	linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...s.com,
	linux-rockchip@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH v7 1/6] PCI: endpoint: Add dynamic_inbound_mapping EPC
 feature

On Wed, Jan 14, 2026 at 01:27:14AM +0900, Koichiro Den wrote:
> Introduce a new EPC feature bit (dynamic_inbound_mapping) that indicates
> whether an Endpoint Controller can update the inbound address
> translation for a BAR without requiring the EPF driver to clear/reset
> the BAR first.
>
> Endpoint Function drivers (e.g. vNTB) can use this information to decide
> whether it really is safe to call pci_epc_set_bar() multiple times to
> update inbound mappings for the BAR.
>
> Suggested-by: Niklas Cassel <cassel@...nel.org>
> Reviewed-by: Niklas Cassel <cassel@...nel.org>
> Signed-off-by: Koichiro Den <den@...inux.co.jp>
> ---
Reviewed-by: Frank Li <Frank.Li@....com>
>  include/linux/pci-epc.h | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
> index 4286bfdbfdfa..4c8516756c56 100644
> --- a/include/linux/pci-epc.h
> +++ b/include/linux/pci-epc.h
> @@ -223,6 +223,10 @@ struct pci_epc_bar_desc {
>  /**
>   * struct pci_epc_features - features supported by a EPC device per function
>   * @linkup_notifier: indicate if the EPC device can notify EPF driver on link up
> + * @dynamic_inbound_mapping: indicate if the EPC device supports updating
> + *                           inbound mappings for an already configured BAR
> + *                           (i.e. allow calling pci_epc_set_bar() again
> + *                           without first calling pci_epc_clear_bar())
>   * @msi_capable: indicate if the endpoint function has MSI capability
>   * @msix_capable: indicate if the endpoint function has MSI-X capability
>   * @intx_capable: indicate if the endpoint can raise INTx interrupts
> @@ -231,6 +235,7 @@ struct pci_epc_bar_desc {
>   */
>  struct pci_epc_features {
>  	unsigned int	linkup_notifier : 1;
> +	unsigned int	dynamic_inbound_mapping : 1;
>  	unsigned int	msi_capable : 1;
>  	unsigned int	msix_capable : 1;
>  	unsigned int	intx_capable : 1;
> --
> 2.51.0
>