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RISC-V: KVM: Remove unnecessary HGATP csr_read

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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>
This commit is contained in:
Guo Ren (Alibaba DAMO Academy) 2025-08-21 10:25:41 -04:00 committed by Anup Patel
parent 2b351e3d04
commit 9eac3744db
1 changed files with 1 additions and 4 deletions
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5
arch/riscv/kvm/vmid.c
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@ -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();