On 21.05.2024 04:54, Marek Marczykowski-Górecki wrote: > On older systems, XHCI xcap had a layout that no other (interesting) registers > were placed on the same page as the debug capability, so Linux was fine with > making the whole page R/O. But at least on Tiger Lake and Alder Lake, Linux > needs to write to some other registers on the same page too. > > Add a generic API for making just parts of an MMIO page R/O and use it to fix > USB3 console with share=yes or share=hwdom options. More details in commit > messages. > > Technically it may still qualify for 4.19, since v1 was sent well before > last posting date. But I realize it's quite late and it isn't top > priority series, so if it won't hit 4.19, it's okay with me too. > > Marek Marczykowski-Górecki (2): > x86/mm: add API for marking only part of a MMIO page read only > drivers/char: Use sub-page ro API to make just xhci dbc cap RO > > xen/arch/x86/hvm/emulate.c | 2 +- > xen/arch/x86/hvm/hvm.c | 8 +- > xen/arch/x86/include/asm/mm.h | 18 ++- > xen/arch/x86/mm.c | 268 +++++++++++++++++++++++++++++++++- > xen/arch/x86/pv/ro-page-fault.c | 1 +- > xen/drivers/char/xhci-dbc.c | 27 +-- > 6 files changed, 309 insertions(+), 15 deletions(-)
Just to mention it here again, with v2 having been quite some time ago: Like for that other work of yours I'm not really convinced the complexity is worth the gain. Ultimately this may once again mean that I'll demand a 2nd maintainer's ack, once technically I may be okay to offer R-b. Jan
