4.19-stable review patch. If anyone has any objections, please let me know.
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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 --- arch/arm/kvm/coproc.c | 4 ++-- arch/arm64/kvm/sys_regs.c | 8 +++++--- 2 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c index cb094e55dc5f..fd6cde23bb5d 100644 --- a/arch/arm/kvm/coproc.c +++ b/arch/arm/kvm/coproc.c @@ -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); } diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 22fbbdbece3c..fe18e68f9a20 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -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; + } }