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| author | Fangyu Yu <fangyu.yu@linux.alibaba.com> | 2025-10-16 04:26:59 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2025-10-17 10:40:01 +0300 |
| commit | 873f10cf8e4d59605bc38fa1051dea8ee56fe3be (patch) | |
| tree | b8bb4b1c9c0c996e94c5d817b690e3fc4e5451f3 /tools/testing/selftests/bpf/prog_tests/autoload.c | |
| parent | ea138a607709bf72c162f62d2a670fe899d73daa (diff) | |
| download | linux-873f10cf8e4d59605bc38fa1051dea8ee56fe3be.tar.xz | |
RISC-V: KVM: Read HGEIP CSR on the correct cpu
When executing kvm_riscv_vcpu_aia_has_interrupts, the vCPU may have
migrated and the IMSIC VS-file have not been updated yet, currently
the HGEIP CSR should be read from the imsic->vsfile_cpu ( the pCPU
before migration ) via on_each_cpu_mask, but this will trigger an
IPI call and repeated IPI within a period of time is expensive in
a many-core systems.
Just let the vCPU execute and update the correct IMSIC VS-file via
kvm_riscv_vcpu_aia_imsic_update may be a simple solution.
Fixes: 4cec89db80ba ("RISC-V: KVM: Move HGEI[E|P] CSR access to IMSIC virtualization")
Signed-off-by: Fangyu Yu <fangyu.yu@linux.alibaba.com>
Reviewed-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Anup Patel <anup@brainfault.org>
Tested-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251016012659.82998-1-fangyu.yu@linux.alibaba.com
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/autoload.c')
0 files changed, 0 insertions, 0 deletions