Commit 9eac3744 authored by Guo Ren (Alibaba DAMO Academy)'s avatar Guo Ren (Alibaba DAMO Academy) Committed by Anup Patel
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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: default avatarFangyu Yu <fangyu.yu@linux.alibaba.com>
Signed-off-by: default avatarFangyu Yu <fangyu.yu@linux.alibaba.com>
Signed-off-by: default avatarGuo Ren (Alibaba DAMO Academy) <guoren@kernel.org>
Reviewed-by: default avatarNutty Liu <nutty.liu@hotmail.com>
Link: https://lore.kernel.org/r/20250821142542.2472079-3-guoren@kernel.org


Signed-off-by: default avatarAnup Patel <anup@brainfault.org>
parent 2b351e3d

arch/riscv/kvm/vmid.c

+1 −4
Original line number Diff line number Diff line
@@ -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();