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| author | Guo Ren (Alibaba DAMO Academy) <guoren@kernel.org> | 2025-08-21 10:25:41 -0400 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2025-09-16 10:54:03 +0530 |
| commit | 9eac3744db944e887c0a73ce0fb4e5680614dd70 (patch) | |
| tree | c2a4e1c883f0a1f4e4cbe14067968e213e722060 /arch/riscv | |
| parent | 2b351e3d04be9e1533f26c3464f1e44a5beace30 (diff) | |
| download | linux-9eac3744db944e887c0a73ce0fb4e5680614dd70.tar.gz | |
RISC-V: KVM: Remove unnecessary HGATP csr_read
The HGATP has been set to zero in gstage_mode_detect(), so there
is no need to save the old context. Unify the code convention
with gstage_mode_detect().
Reviewed-by: Fangyu Yu <fangyu.yu@linux.alibaba.com>
Signed-off-by: Fangyu Yu <fangyu.yu@linux.alibaba.com>
Signed-off-by: Guo Ren (Alibaba DAMO Academy) <guoren@kernel.org>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Link: https://lore.kernel.org/r/20250821142542.2472079-3-guoren@kernel.org
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/kvm/vmid.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/riscv/kvm/vmid.c b/arch/riscv/kvm/vmid.c index 5f33625f407065..abb1c2bf254234 100644 --- a/arch/riscv/kvm/vmid.c +++ b/arch/riscv/kvm/vmid.c @@ -25,15 +25,12 @@ static DEFINE_SPINLOCK(vmid_lock); void __init kvm_riscv_gstage_vmid_detect(void) { - unsigned long old; - /* Figure-out number of VMID bits in HW */ - old = csr_read(CSR_HGATP); csr_write(CSR_HGATP, (kvm_riscv_gstage_mode << HGATP_MODE_SHIFT) | HGATP_VMID); vmid_bits = csr_read(CSR_HGATP); vmid_bits = (vmid_bits & HGATP_VMID) >> HGATP_VMID_SHIFT; vmid_bits = fls_long(vmid_bits); - csr_write(CSR_HGATP, old); + csr_write(CSR_HGATP, 0); /* We polluted local TLB so flush all guest TLB */ kvm_riscv_local_hfence_gvma_all(); |