RISC-V: KVM: Avoid one-word masks for SBI v0.1 all-harts

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KVM already treats a NULL hart-mask pointer in SBI v0.1 calls as all
harts, matching OpenSBI's legacy handling. The current handler builds that
target set as (1UL << online_vcpus) - 1 before iterating the mask.

That expression shifts by the type width once the VM has BITS_PER_LONG
online vCPUs, and a single word cannot represent larger VMs. A count-based
mask also selects the wrong IDs when vCPU IDs are sparse.

Handle SEND_IPI with a NULL hart-mask by iterating all online vCPUs
directly. For remote fence calls, use the existing hbase == -1UL
convention so the common fence request helper targets the whole VM
without consulting hmask.

Non-NULL guest hart masks keep the existing v0.1 behavior.

Fixes: a046c2d857 ("RISC-V: KVM: Reorganize SBI code by moving SBI v0.1 to its own file")
Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260718040000.010.826fe94e-caplitmus-rv@iscas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>

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Pengpeng Hou 2026-07-18 12:39:29 +08:00 • committed by Anup Patel

parent 4a94f45ef7

commit f06b670cfd

1 changed files with 30 additions and 22 deletions

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arch/riscv/kvm/vcpu_sbi_v01.c

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