[PATCH 09/56] KVM: arm64: Tolerate an empty target_table list
From: Marc Zyngier <maz@kernel.org>
Date: 2020-08-05 17:59:02
Also in:
kvm, kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
From: James Morse <james.morse@arm.com> Before emptying the target_table lists, and then removing their infrastructure, add some tolerance to an empty list. Instead of bugging-out on an empty list, pretend we already reached the end in the two-list-walk. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200622113317.20477-3-james.morse@arm.com (local) --- arch/arm64/kvm/sys_regs.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 6333a7cd92d3..fb448bfc83ec 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c@@ -2809,7 +2809,10 @@ static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind) i2 = sys_reg_descs; end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs); - BUG_ON(i1 == end1 || i2 == end2); + if (i1 == end1) + i1 = NULL; + + BUG_ON(i2 == end2); /* Walk carefully, as both tables may refer to the same register. */ while (i1 || i2) {
--
2.27.0
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