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arm/arm64: KVM: Don't panic on failure to properly reset system registers

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[ Upstream commit 20589c8cc47dce5854c8bf1b44a9fc63d798d26d ]

Failing to properly reset system registers is pretty bad. But not
quite as bad as bringing the whole machine down... So warn loudly,
but slightly more gracefully.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marc Zyngier 2018-12-20 13:07:40 +00:00 committed by Greg Kroah-Hartman
parent b78379c337
commit c831293622
2 changed files with 7 additions and 5 deletions
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4
arch/arm/kvm/coproc.c
View File

@ -1450,6 +1450,6 @@ void kvm_reset_coprocs(struct kvm_vcpu *vcpu)
reset_coproc_regs(vcpu, table, num);
for (num = 1; num < NR_CP15_REGS; num++)
if (vcpu_cp15(vcpu, num) == 0x42424242)
panic("Didn't reset vcpu_cp15(vcpu, %zi)", num);
WARN(vcpu_cp15(vcpu, num) == 0x42424242,
"Didn't reset vcpu_cp15(vcpu, %zi)", num);
}

8
arch/arm64/kvm/sys_regs.c
View File

@ -2586,7 +2586,9 @@ void kvm_reset_sys_regs(struct kvm_vcpu *vcpu)
table = get_target_table(vcpu->arch.target, true, &num);
reset_sys_reg_descs(vcpu, table, num);
for (num = 1; num < NR_SYS_REGS; num++)
if (__vcpu_sys_reg(vcpu, num) == 0x4242424242424242)
panic("Didn't reset __vcpu_sys_reg(%zi)", num);
for (num = 1; num < NR_SYS_REGS; num++) {
if (WARN(__vcpu_sys_reg(vcpu, num) == 0x4242424242424242,
"Didn't reset __vcpu_sys_reg(%zi)\n", num))
break;
}
}