On 8/6/24 01:50, Peter Zijlstra wrote:
On Mon, Aug 05, 2024 at 09:52:06PM -0700, Guenter Roeck wrote:Hi Peter, On Thu, Aug 01, 2024 at 10:55:31AM -0000, tip-bot2 for Peter Zijlstra wrote:The following commit has been merged into the x86/urgent branch of tip: Commit-ID: 49947e7aedfea2573bada0c95b85f6c2363bef9f Gitweb: https://git.kernel.org/tip/49947e7aedfea2573bada0c95b85f6c2363bef9f Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx> AuthorDate: Thu, 01 Aug 2024 12:42:25 +02:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Thu, 01 Aug 2024 12:48:23 +02:00 x86/mm: Fix pti_clone_entry_text() for i386 While x86_64 has PMD aligned text sections, i386 does not have this luxery. Notably ALIGN_ENTRY_TEXT_END is empty and _etext has PAGE alignment. This means that text on i386 can be page granular at the tail end, which in turn means that the PTI text clones should consistently account for this. Make pti_clone_entry_text() consistent with pti_clone_kernel_text(). Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>With this patch in the tree, some of my qemu tests (those with PAE enabled) report several WARNING backtraces. WARNING: CPU: 0 PID: 1 at arch/x86/mm/pti.c:256 pti_clone_pgtable+0x298/0x2dc WARNING: CPU: 0 PID: 1 at arch/x86/mm/pti.c:394 pti_clone_pgtable+0x29a/0x2dc The backtraces are repeated multiple times. Please see https://kerneltests.org/builders/qemu-x86-master/builds/253/steps/qemubuildcommand/logs/stdio for complete logs.Could you try the below patch? If that don't work, could you provide the .config, I'm assuming that'll work with the bits I grabbed last time.
Unfortunately that makes it worse: It causes qemu to quit immediately without logging anything. I created http://server.roeck-us.net/qemu/x86-v6.11-rc2/ with all the relevant information. Please let me know if you need anything else. Thanks, Guenter
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