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From: "Jiaxun Yang" <jiaxun.yang@flygoat.com>
To: "BALATON Zoltan" <balaton@eik.bme.hu>,
	"Philippe Mathieu-Daudé" <f4bug@amsat.org>
Cc: "Peter Maydell" <peter.maydell@linaro.org>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"Huacai Chen" <chenhuacai@kernel.org>,
	"Mark Cave-Ayland" <mark.cave-ayland@ilande.co.uk>,
	"BALATON Zoltan via" <qemu-devel@nongnu.org>,
	"Hervé Poussineau" <hpoussin@reactos.org>
Subject: Re: [PATCH v2 08/13] vt82c686: Move creation of ISA devices to the ISA bridge
Date: Mon, 11 Jan 2021 09:38:22 +0800	[thread overview]
Message-ID: <f5466f0b-cc4f-4a71-8c06-7971198a7602@www.fastmail.com> (raw)
In-Reply-To: <1b55216e-4526-6f50-eac2-f91797a64e7@eik.bme.hu>



On Mon, Jan 11, 2021, at 3:25 AM, BALATON Zoltan wrote:
> On Sun, 10 Jan 2021, Philippe Mathieu-Daudé wrote:
> > +PCI experts
> >
> > On 1/10/21 1:43 AM, BALATON Zoltan wrote:
> >> On Sun, 10 Jan 2021, Philippe Mathieu-Daudé wrote:

[...]

> > I'm not a PCI expert but my understanding is PCI device functions are
> > restricted to the PCI bus address space. The host bridge may map this
> > space within the host.
> >
> > QEMU might be using get_system_memory() because for some host bridge
> > the mapping is not implemented so it was easier this way?
> 
> Maybe, also one less indirection which if not really needed is a good 
> thing for performance so unless it's found to be needed to use another 
> address space here I'm happy with this as it matches what other similar 
> devices do and it seems to work. Maybe a separate address space is only 
> really needed if we have an iommu?

Hi Zoltan,

It is possible for bonito to remap PCI address space so maybe it's essential for bonito.

Appreciate for your work. I'm going to help with reviewing as well.

> 
> Regards,
> BALATON Zoltan

-- 
- Jiaxun


  reply	other threads:[~2021-01-11  1:39 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-09 20:16 [PATCH v2 00/13] vt82c686b clean ups and vt8231 emulation BALATON Zoltan
2021-01-09 20:16 ` [PATCH v2 04/13] vt82c686: Fix up power management io base and config BALATON Zoltan
2021-02-20 18:58   ` Philippe Mathieu-Daudé
2021-02-20 22:33     ` BALATON Zoltan
2021-01-09 20:16 ` [PATCH v2 02/13] vt82c686: Reorganise code BALATON Zoltan
2021-01-09 20:16 ` [PATCH v2 08/13] vt82c686: Move creation of ISA devices to the ISA bridge BALATON Zoltan
2021-01-10  0:21   ` Philippe Mathieu-Daudé
2021-01-10  0:43     ` BALATON Zoltan
2021-01-10 11:34       ` Philippe Mathieu-Daudé
2021-01-10 19:25         ` BALATON Zoltan
2021-01-11  1:38           ` Jiaxun Yang [this message]
2021-01-11 10:28             ` BALATON Zoltan
2021-01-25 17:57               ` Philippe Mathieu-Daudé
2021-02-01 20:04           ` BALATON Zoltan
2021-02-04 12:35             ` Jiaxun Yang
2021-02-04 13:10               ` BALATON Zoltan
2021-02-09 16:55             ` BALATON Zoltan
2021-02-17 20:36               ` BALATON Zoltan
2021-01-09 20:16 ` [PATCH v2 03/13] vt82c686: Fix SMBus IO base and configuration registers BALATON Zoltan
2021-01-12 12:54   ` Jiaxun Yang
2021-01-12 22:25     ` BALATON Zoltan
2021-01-13  2:24       ` Jiaxun Yang
2021-01-09 20:16 ` [PATCH v2 13/13] vt82c686: Add emulation of VT8231 south bridge BALATON Zoltan
2021-01-09 20:16 ` [PATCH v2 09/13] vt82c686: Fix superio_cfg_{read,write}() functions BALATON Zoltan
2021-02-20 19:24   ` Philippe Mathieu-Daudé
2021-02-20 22:00     ` BALATON Zoltan
2021-01-09 20:16 ` [PATCH v2 01/13] vt82c686: Move superio memory region to SuperIOConfig struct BALATON Zoltan
2021-01-10  0:06   ` Philippe Mathieu-Daudé
2021-01-13  2:26   ` Jiaxun Yang
2021-01-09 20:16 ` [PATCH v2 05/13] vt82c686: Set user_creatable=false for VT82C686B_PM BALATON Zoltan
2021-01-09 23:41   ` Philippe Mathieu-Daudé
2021-01-13  2:27   ` Jiaxun Yang
2021-01-09 20:16 ` [PATCH v2 07/13] vt82c686: Simplify vt82c686b_realize() BALATON Zoltan
2021-01-09 20:16 ` [PATCH v2 11/13] vt82c686: QOM-ify superio related functionality BALATON Zoltan
2021-01-09 20:16 ` [PATCH v2 12/13] vt82c686: Add VT8231_SUPERIO based on VIA_SUPERIO BALATON Zoltan
2021-01-09 20:16 ` [PATCH v2 06/13] vt82c686: Make vt82c686b-pm an abstract base class and add vt8231-pm based on it BALATON Zoltan
2021-01-09 23:42   ` Philippe Mathieu-Daudé
2021-01-09 20:16 ` [PATCH v2 10/13] vt82c686: Implement control of serial port io ranges via config regs BALATON Zoltan
2021-02-20 19:30   ` Philippe Mathieu-Daudé
2021-02-20 22:53     ` BALATON Zoltan
2021-02-21  9:48 ` [PATCH v2 00/13] vt82c686b clean ups and vt8231 emulation Philippe Mathieu-Daudé

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