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| author | Yong-Xuan Wang <yongxuan.wang@sifive.com> | 2026-10-05 19:02:38 -0600 |
|---|---|---|
| committer | Paul Walmsley <pjw@kernel.org> | 2026-10-05 19:02:38 -0600 |
| commit | 6694612317e5225086e39ca1ba97ada2b1942e48 (patch) | |
| tree | 93c71792c94fc369d79f50776ae784d812c67d36 /tools/lib/python/kdoc/python_version.py | |
| parent | 148ab873d8194cb44f29474da3b4428fa2e100d1 (diff) | |
| download | linux-next-6694612317e5225086e39ca1ba97ada2b1942e48.tar.gz linux-next-6694612317e5225086e39ca1ba97ada2b1942e48.zip | |
RISC-V: Clear HSTATUS.HU on CPU initialization
The RISC-V privileged specification does not mandate HSTATUS reset
values, leaving the HU bit potentially set after hardware reset.
When HU=1, hypervisor instructions (HLV/HLVX/HSV) can execute in
U-mode to access guest memory, which may cause unintended behavior
if not explicitly controlled.
Clear HSTATUS.HU during CPU initialization to ensure hypervisor
instructions are only available in HS-mode, preventing unexpected
guest memory access from U-mode code.
Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Link: https://patch.msgid.link/20260924-hstatus_hu-v2-1-7e970f5f1d8d@sifive.com
Cc: stable@vger.kernel.org
[pjw@kernel.org: capitalized RISCV_ISA_EXT_h to fix build; added stable cc]
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Diffstat (limited to 'tools/lib/python/kdoc/python_version.py')
0 files changed, 0 insertions, 0 deletions