RISC-V: KVM: Write hgatp register with valid mode bits

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[ Upstream commit 2b351e3d04 ]

According to the RISC-V Privileged Architecture Spec, when MODE=Bare
is selected,software must write zero to the remaining fields of hgatp.

We have detected the valid mode supported by the HW before, So using a
valid mode to detect how many vmid bits are supported.

Fixes: fd7bb4a251 ("RISC-V: KVM: Implement VMID allocator")
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Reviewed-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
Reviewed-by: Guo Ren (Alibaba DAMO Academy) <guoren@kernel.org>
Signed-off-by: Fangyu Yu <fangyu.yu@linux.alibaba.com>
Signed-off-by: Guo Ren (Alibaba DAMO Academy) <guoren@kernel.org>
Link: https://lore.kernel.org/r/20250821142542.2472079-2-guoren@kernel.org
Signed-off-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Fangyu Yu 2025-08-21 10:25:40 -04:00 • committed by Greg Kroah-Hartman

parent 9239611af7

commit d00b61cd37

1 changed files with 2 additions and 1 deletions

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arch/riscv/kvm/vmid.c

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