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.
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 | 4 +-
xen/arch/x86/include/asm/mm.h | 23 +++-
xen/arch/x86/mm.c | 261 +++++++++++++++++++++++++++++++++-
xen/arch/x86/pv/ro-page-fault.c | 6 +-
xen/drivers/char/xhci-dbc.c | 36 +++--
6 files changed, 313 insertions(+), 19 deletions(-)
base-commit: b25b28ede1cba43eda1e0b84ad967683b8196847
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git-series 0.9.1