From: Gerd Hoffmann <kraxel@redhat.com>
To: Igor Mammedov <imammedo@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>,
Eduardo Habkost <ehabkost@redhat.com>,
Sergio Lopez <slp@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
qemu-devel@nongnu.org, Shannon Zhao <shannon.zhaosl@gmail.com>,
qemu-arm@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>,
Richard Henderson <rth@twiddle.net>
Subject: Re: [PATCH v3 14/22] microvm: use 2G split unconditionally
Date: Tue, 26 May 2020 06:48:39 +0200 [thread overview]
Message-ID: <20200526044839.bncj6iltugnzgfmy@sirius.home.kraxel.org> (raw)
In-Reply-To: <20200525183615.5f8e67d3@redhat.com>
> > Well, I think we can (should) drop max-ram-below-4g too. There is
> > no reason to use that with microvm, other that shooting yourself into
> > the foot (by making mmio overlap with ram).
> >
> > With that being gone too there isn't much logic left ...
>
> I wonder if we need 2G split for microvm at all?
> Can we map 1 contiguous big blob from 0 GPA and overlay bios & other x86 TOLUD stuff?
I think it would work, but it has some drawbacks:
(1) we loose a bit of memory.
(2) we loose a gigabyte page.
(3) we wouldn't have guard pages (unused address space) between
between ram and mmio space.
take care,
Gerd
next prev parent reply other threads:[~2020-05-26 4:49 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 13:19 [PATCH v3 00/22] microvm: add acpi support Gerd Hoffmann
2020-05-20 13:19 ` [PATCH v3 01/22] microvm: name qboot binary qboot.bin Gerd Hoffmann
2020-05-20 13:25 ` Philippe Mathieu-Daudé
2020-05-25 11:02 ` Gerd Hoffmann
2020-05-25 12:26 ` Philippe Mathieu-Daudé
2020-05-20 13:19 ` [PATCH v3 02/22] [testing] seabios: update submodule to master snapshot Gerd Hoffmann
2020-05-20 13:19 ` [PATCH v3 03/22] [testing] seabios: update config & build rules Gerd Hoffmann
2020-05-20 13:19 ` [PATCH v3 04/22] [testing] seabios: update binaries to master snapshot Gerd Hoffmann
2020-05-20 13:19 ` [PATCH v3 05/22] acpi: make build_madt() more generic Gerd Hoffmann
2020-05-20 13:19 ` [PATCH v3 06/22] acpi: create acpi-common.c and move madt code Gerd Hoffmann
2020-05-20 13:31 ` Philippe Mathieu-Daudé
2020-05-20 13:19 ` [PATCH v3 07/22] acpi: madt: skip pci override on pci-less systems Gerd Hoffmann
2020-05-20 13:19 ` [PATCH v3 08/22] acpi: fadt: add hw-reduced sleep register support Gerd Hoffmann
2020-05-20 13:19 ` [PATCH v3 09/22] acpi: ged: rename event memory region Gerd Hoffmann
2020-05-20 13:33 ` Philippe Mathieu-Daudé
2020-05-21 7:58 ` Igor Mammedow
2020-05-20 13:19 ` [PATCH v3 10/22] acpi: ged: add control regs Gerd Hoffmann
2020-05-21 8:58 ` Igor Mammedov
2020-05-20 13:19 ` [PATCH v3 11/22] acpi: ged: add x86 device variant Gerd Hoffmann
2020-05-21 9:01 ` Igor Mammedov
2020-05-20 13:19 ` [PATCH v3 12/22] acpi: move acpi_dsdt_add_power_button() to ged Gerd Hoffmann
2020-05-20 13:32 ` Philippe Mathieu-Daudé
2020-05-21 9:03 ` Igor Mammedov
2020-05-20 13:19 ` [PATCH v3 13/22] x86: coldplug cpus Gerd Hoffmann
2020-05-20 14:07 ` Igor Mammedov
2020-05-20 13:19 ` [PATCH v3 14/22] microvm: use 2G split unconditionally Gerd Hoffmann
2020-05-20 13:34 ` Philippe Mathieu-Daudé
2020-05-21 9:14 ` Igor Mammedov
2020-05-21 9:29 ` Igor Mammedov
2020-05-25 11:45 ` Gerd Hoffmann
2020-05-25 16:36 ` Igor Mammedov
2020-05-26 4:48 ` Gerd Hoffmann [this message]
2020-05-27 12:25 ` Igor Mammedov
2020-05-27 13:06 ` Paolo Bonzini
2020-05-27 14:26 ` Igor Mammedov
2020-05-27 14:35 ` Igor Mammedov
2020-05-27 14:54 ` Paolo Bonzini
2020-05-28 7:19 ` Gerd Hoffmann
2020-05-28 7:17 ` Gerd Hoffmann
2020-05-20 13:19 ` [PATCH v3 15/22] microvm: make virtio irq base runtime configurable Gerd Hoffmann
2020-05-20 13:29 ` Philippe Mathieu-Daudé
2020-05-25 11:49 ` Gerd Hoffmann
2020-05-25 12:27 ` Philippe Mathieu-Daudé
2020-05-20 13:19 ` [PATCH v3 16/22] microvm/acpi: add minimal acpi support Gerd Hoffmann
2020-05-21 10:09 ` Igor Mammedov
2020-05-20 13:19 ` [PATCH v3 17/22] microvm/acpi: add acpi_dsdt_add_virtio() for x86 Gerd Hoffmann
2020-05-21 10:12 ` Igor Mammedov
2020-05-20 13:19 ` [PATCH v3 18/22] microvm/acpi: use GSI 16-23 for virtio Gerd Hoffmann
2020-05-21 10:13 ` Igor Mammedov
2020-05-20 13:20 ` [PATCH v3 19/22] microvm/acpi: use seabios with acpi=on Gerd Hoffmann
2020-05-21 10:14 ` Igor Mammedov
2020-05-20 13:20 ` [PATCH v3 20/22] microvm/acpi: disable virtio-mmio cmdline hack Gerd Hoffmann
2020-05-20 13:20 ` [PATCH v3 21/22] [RfC] acpi: add per machine type acpi default Gerd Hoffmann
2020-05-21 10:26 ` Igor Mammedov
2020-05-20 13:20 ` [PATCH v3 22/22] [RfC] acpi: flip default to off for microvm Gerd Hoffmann
2020-05-21 10:36 ` Igor Mammedov
2020-05-25 12:11 ` Gerd Hoffmann
2020-05-20 15:46 ` [PATCH v3 00/22] microvm: add acpi support no-reply
2020-05-20 15:50 ` no-reply
2020-05-20 15:51 ` no-reply
2020-05-20 15:53 ` no-reply
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