RISC-V: KVM: Use try_cmpxchg for IMSIC MRIF RMW

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Currently the RMW for IMSIC MRIF is implemented with word LRSC loop.
This will only cover the lower 32bit on a 64bit system. Instead of
guard the implementation with CONFIG_64BIT here, use try_cmpxchg()
wrapper which has already take care this to fix this issue.
It can also use AMO instructions on supported system.

Fixes: db8b7e97d6 ("RISC-V: KVM: Add in-kernel virtualization of AIA IMSIC")
Signed-off-by: Yicong Yang <yang.yicong@picoheart.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260728141938.95845-1-yang.yicong@picoheart.com
Signed-off-by: Anup Patel <anup@brainfault.org>

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Yicong Yang 2026-07-28 22:19:38 +08:00 • committed by Anup Patel

parent 739dfb8b4b

commit e0ba6bf657

1 changed files with 5 additions and 9 deletions

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arch/riscv/kvm/aia_imsic.c

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