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Currently, kvm_riscv_gstage_ioremap() is used to map IMSIC gpa to the
spa of IMSIC guest interrupt file.
The PAGE_KERNEL_IO property includes global setting whereas it does not
include user mode settings, so when accessing the IMSIC address in the
virtual machine, a guest page fault will occur, this is not expected.
According to the RISC-V Privileged Architecture Spec, for G-stage address
translation, all memory accesses are considered to be user-level accesses
as though executed in U-mode.
Fixes: 659ad6d82c ("RISC-V: KVM: Use PAGE_KERNEL_IO in kvm_riscv_gstage_ioremap()")
Signed-off-by: Fangyu Yu <fangyu.yu@linux.alibaba.com>
Reviewed-by: Radim Krčmář <rkrcmar@ventanamicro.com>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Link: https://lore.kernel.org/r/20250807070729.89701-1-fangyu.yu@linux.alibaba.com
Signed-off-by: Anup Patel <anup@brainfault.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.