linux-kernel - Re: [PATCH v2 07/11] x86: drop SWIOTLB and PHYS_ADDR_T

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Message-Id: <0866384c-990f-40b2-8815-2525f9323453@app.fastmail.com>
Date: Sun, 22 Dec 2024 22:19:39 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "kernel test robot" <oliver.sang@...el.com>,
 "Arnd Bergmann" <arnd@...nel.org>
Cc: oe-lkp@...ts.linux.dev, "kernel test robot" <lkp@...el.com>,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
 "Thomas Gleixner" <tglx@...utronix.de>, "Ingo Molnar" <mingo@...hat.com>,
 "Borislav Petkov" <bp@...en8.de>,
 "Dave Hansen" <dave.hansen@...ux.intel.com>,
 "H. Peter Anvin" <hpa@...or.com>,
 "Linus Torvalds" <torvalds@...ux-foundation.org>,
 "Andy Shevchenko" <andy@...nel.org>, "Matthew Wilcox" <willy@...radead.org>
Subject: Re: [PATCH v2 07/11] x86: drop SWIOTLB and PHYS_ADDR_T_64BIT for PAE

On Fri, Dec 20, 2024, at 03:52, kernel test robot wrote:
>
> config: i386-randconfig-001-20241213
> compiler: gcc-12
> test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)
>

I haven't been able to figure this out, apparently something goes
wrong on a KVM guest that has more than 32-bit of addressing (RAM+MMIO)
when it uses a 32-bit phys_addr_t.

I changed the patch now to only drop SWIOTLB, not PHYS_ADDR_T_64BIT.

       Arnd