From: Tom Rini <trini@konsulko.com>
To: Simon Glass <sjg@chromium.org>
Cc: U-Boot Mailing List <u-boot@lists.denx.de>,
Bin Meng <bmeng.cn@gmail.com>,
Andrew Goodbody <andrew.goodbody@linaro.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Angelo Dureghello <angelo@kernel-space.org>,
Guillaume La Roque <glaroque@baylibre.com>,
Heinrich Schuchardt <xypron.glpk@gmx.de>,
Igor Opaniuk <igor.opaniuk@gmail.com>,
Jerome Forissier <jerome.forissier@linaro.org>,
Julien Masson <jmasson@baylibre.com>,
Julius Lehmann <lehmanju@devpi.de>,
Love Kumar <love.kumar@amd.com>,
Marek Vasut <marek.vasut+renesas@mailbox.org>,
Martyn Welch <martyn.welch@collabora.com>,
Mattijs Korpershoek <mkorpershoek@baylibre.com>,
Maximilian Brune <maximilian.brune@9elements.com>,
Moritz Fischer <moritzf@google.com>,
Patrick Rudolph <patrick.rudolph@9elements.com>,
Philip Oberfichtner <pro@denx.de>,
Quentin Schulz <quentin.schulz@cherry.de>,
Richard Weinberger <richard@nod.at>,
Stephen Warren <swarren@nvidia.com>,
Stephen Warren <swarren@wwwdotorg.org>,
Sughosh Ganu <sughosh.ganu@linaro.org>,
qemu-devel@nongnu.org
Subject: Re: [PATCH v4 00/47] x86: Improve operation under QEMU
Date: Fri, 7 Mar 2025 08:22:55 -0600 [thread overview]
Message-ID: <20250307142255.GL2640854@bill-the-cat> (raw)
In-Reply-To: <20250306160428.3041057-1-sjg@chromium.org>
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On Thu, Mar 06, 2025 at 09:03:27AM -0700, Simon Glass wrote:
> U-Boot can start and boot an OS in both qemu-x86 and qemu-x86_64 but it
> is not perfect.
>
> With both builds, executing the VESA ROM causes an intermittent hang, at
> least on some AMD CPUs.
>
> With qemu-x86_64 kvm cannot be used since the move to long mode (64-bit)
> is done in a way that works on real hardware but not with QEMU. This
> means that performance is 4-5x slower than it could be, at least on my
> CPU.
>
> We can work around the first problem by using Bochs, which is anyway a
> better choice than VESA for QEMU. The second can be addressed by using
> the same descriptor across the jump to long mode.
>
> With an MTRR fix this allows booting into Ubuntu on qemu-x86_64
>
> In v3 some e820 patches are included to make booting reliable and avoid
> ACPI tables being dropped. Also, several MTTR problems are addressed, to
> support memory sizes above 4GB reliably.
Do you plan to rebase the prerequisite series' this requires so that it
can be merged?
--
Tom
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next prev parent reply other threads:[~2025-03-07 14:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-06 16:03 [PATCH v4 00/47] x86: Improve operation under QEMU Simon Glass
2025-03-06 16:03 ` [PATCH v4 04/47] x86: qemu: Switch to bochs display Simon Glass
2025-03-06 16:03 ` [PATCH v4 05/47] x86: qemu: Enable dhrystone Simon Glass
2025-03-06 16:03 ` [PATCH v4 06/47] x86: qemu: Avoid accessing BSS too early Simon Glass
2025-03-06 16:03 ` [PATCH v4 28/47] x86: qemu: Support environment and cat command Simon Glass
2025-03-06 16:04 ` [PATCH v4 34/47] x86: qemu: Use the new e820 API Simon Glass
2025-03-07 14:22 ` Tom Rini [this message]
2025-03-14 14:44 ` [PATCH v4 00/47] x86: Improve operation under QEMU Simon Glass
2025-03-14 16:06 ` Tom Rini
2025-03-15 12:54 ` Simon Glass
2025-03-15 13:57 ` Tom Rini
2025-03-15 14:38 ` Simon Glass
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