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| author | Andy Chiu <andy.chiu@sifive.com> | 2023-06-05 14:07:18 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-06-08 17:16:53 +0300 |
| commit | 1fd96a3e9d5d4febe1a8486590ad52c048d1be77 (patch) | |
| tree | c8f955b0183f12182763b56926e58441fc516a59 /arch/riscv/kvm | |
| parent | 50724efcb370c61c64f75614763fb411e087f70c (diff) | |
| download | linux-1fd96a3e9d5d4febe1a8486590ad52c048d1be77.tar.xz | |
riscv: Add prctl controls for userspace vector management
This patch add two riscv-specific prctls, to allow usespace control the
use of vector unit:
* PR_RISCV_V_SET_CONTROL: control the permission to use Vector at next,
or all following execve for a thread. Turning off a thread's Vector
live is not possible since libraries may have registered ifunc that
may execute Vector instructions.
* PR_RISCV_V_GET_CONTROL: get the same permission setting for the
current thread, and the setting for following execve(s).
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Greentime Hu <greentime.hu@sifive.com>
Reviewed-by: Vincent Chen <vincent.chen@sifive.com>
Link: https://lore.kernel.org/r/20230605110724.21391-22-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/kvm')
| -rw-r--r-- | arch/riscv/kvm/vcpu.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index e5e045852e6a..de24127e7e93 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -88,6 +88,8 @@ static bool kvm_riscv_vcpu_isa_enable_allowed(unsigned long ext) switch (ext) { case KVM_RISCV_ISA_EXT_H: return false; + case KVM_RISCV_ISA_EXT_V: + return riscv_v_vstate_ctrl_user_allowed(); default: break; } |