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KVM userspaces need to be aware of the host SATP to allow them to advertise it back to the guest OS. Since this information is used to build the guest FDT we can't wait for the SATP reg to be readable. We just need to read the SATP mode, thus we can use the existing 'satp_mode' global that represents the SATP reg with MODE set and both ASID and PPN cleared. E.g. for a 32 bit host running with sv32 satp_mode is 0x80000000, for a 64 bit host running sv57 satp_mode is 0xa000000000000000, and so on. Add a new userspace virtual config register 'satp_mode' to allow userspace to read the current SATP mode the host is using with GET_ONE_REG API before spinning the vcpu. 'satp_mode' can't be changed via KVM, so SET_ONE_REG is allowed as long as userspace writes the existing 'satp_mode'. Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Anup Patel <anup@brainfault.org> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 Restructured Text 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.