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RISC-V: KVM: Fix the size parameter check in SBI SFENCE calls

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[ Upstream commit 6aba0cb5bba6141158d5449f2cf53187b7f755f9 ]

As-per the SBI specification, an SBI remote fence operation applies
to the entire address space if either:
1) start_addr and size are both 0
2) size is equal to 2^XLEN-1

>From the above, only #1 is checked by SBI SFENCE calls so fix the
size parameter check in SBI SFENCE calls to cover #2 as well.

Fixes: 13acfec2db ("RISC-V: KVM: Add remote HFENCE functions based on VCPU requests")
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Link: https://lore.kernel.org/r/20250605061458.196003-2-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Anup Patel
2025-06-05 11:44:46 +05:30
committed by Greg Kroah-Hartman
parent a77d0a14ed
commit e20f0f44ec
1 changed files with 2 additions and 2 deletions
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4
arch/riscv/kvm/vcpu_sbi_replace.c
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@@ -103,7 +103,7 @@ static int kvm_sbi_ext_rfence_handler(struct kvm_vcpu *vcpu, struct kvm_run *run
kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_FENCE_I_SENT); kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_FENCE_I_SENT);
break; break;
case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA: case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
if (cp->a2 == 0 && cp->a3 == 0) if ((cp->a2 == 0 && cp->a3 == 0) || cp->a3 == -1UL)
kvm_riscv_hfence_vvma_all(vcpu->kvm, hbase, hmask); kvm_riscv_hfence_vvma_all(vcpu->kvm, hbase, hmask);
else else
kvm_riscv_hfence_vvma_gva(vcpu->kvm, hbase, hmask, kvm_riscv_hfence_vvma_gva(vcpu->kvm, hbase, hmask,
@@ -111,7 +111,7 @@ static int kvm_sbi_ext_rfence_handler(struct kvm_vcpu *vcpu, struct kvm_run *run
kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_HFENCE_VVMA_SENT); kvm_riscv_vcpu_pmu_incr_fw(vcpu, SBI_PMU_FW_HFENCE_VVMA_SENT);
break; break;
case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID: case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID:
if (cp->a2 == 0 && cp->a3 == 0) if ((cp->a2 == 0 && cp->a3 == 0) || cp->a3 == -1UL)
kvm_riscv_hfence_vvma_asid_all(vcpu->kvm, kvm_riscv_hfence_vvma_asid_all(vcpu->kvm,
hbase, hmask, cp->a4); hbase, hmask, cp->a4);
else else