On 26/03/2019 04:03, Amit Daniel Kachhap wrote:
> Hi,
>
> On 3/26/19 1:34 AM, Kristina Martsenko wrote:
>> On 19/03/2019 08:30, Amit Daniel Kachhap wrote:
>>> From: Mark Rutland <mark.rutland@xxxxxxx>
>>>
>>> When pointer authentication is supported, a guest may wish to use it.
>>> This patch adds the necessary KVM infrastructure for this to work, with
>>> a semi-lazy context switch of the pointer auth state.
>>
>> [...]
>>
>>> + if (test_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, vcpu->arch.features) ||
>>> + test_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, vcpu->arch.features)) {
>>> + /* Verify that KVM startup matches the conditions for ptrauth */
>>> + if (WARN_ON(!vcpu_has_ptrauth(vcpu)))
>>> + return -EINVAL;
>>> + }
>>
>> I think this now needs to have "goto out;" instead of "return -EINVAL;",
>> since 5.1-rcX contains commit e761a927bc9a ("KVM: arm/arm64: Reset the
>> VCPU without preemption and vcpu state loaded") which changed some of
>> this code.
> ok missed the changes for this commit.
One more thing - I think the WARN_ON() here should be removed. Otherwise
if panic_on_warn is set then userspace can panic the kernel. I think
WARN_ON is only for internal kernel errors (see comment in
include/asm-generic/bug.h).
Thanks,
Kristina
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