On Mon, 25 May 2026 14:28:03 +0800, George Guo <[email protected]> wrote:
Hi, > [...] > > Bug fixes (patches 3-4) > ------------------------ > Patch 3 fixes a build failure with CONFIG_KFENCE=y: virt_to_phys() and > phys_to_virt() in asm/io.h expand to use offset_in_page() and > page_address(), which require <linux/mm.h> that was not included. This fix looks unrelated to KHO, it makes sense to send it as a separate patch. > > Patch 4 moves KEXEC_CONTROL_CODE from 0x100000 to 0x180000. QEMU > places its machine FDT at 0x100000 when booting with '-kernel'; the > previous placement silently overwrote the FDT with the relocation And I believe that patch 2 and patch 4 can be folded into patch 1 so that addition of KHO support will be a single patch. > trampoline, breaking earlycon in the kexec'd kernel. > > Selftest support (patches 5-7) > ------------------------------- > Patch 5 adds loongarch.conf and extends vmtest.sh to recognise > loongarch64 as a build target. QEMU's LoongArch virt machine is > FDT-only (no ACPI), so 'earlycon' must appear on the kernel cmdline or > the console UART is never discovered and the test log stays empty. > > Patch 6 disables SERIO_I8042 and its dependents in the QEMU_KCONFIG > fragment. QEMU's LoongArch virt machine has no i8042 controller; the > fallback port probe hits a page fault on the memory-mapped I/O range and > panics before reaching userspace. This should be folded into patch 5 for sure. > > Patch 7 polls the serial output for the test verdict and kills QEMU once > it appears. QEMU provides no EFI runtime services on LoongArch, so > machine_restart() falls through to an infinite idle loop and QEMU never > exits after kexec. And since without this selftest would hang on loongarch, the timeout handing should be folded into patch 5. In general, the rationale when adding new features is to make sure that after each patch there are no regressions and the new functionality either works or cannot be enabled until completely implemented. -- Sincerely yours, Mike.
