linux-kernel - Re: [PATCH 2/3] nVMX: Implement emulated Page Modification Logging

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <jpgbmr8fq54.fsf@linux.bootlegged.copy>
Date:   Thu, 04 May 2017 14:11:51 -0400
From:   Bandan Das <bsd@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] nVMX: Implement emulated Page Modification Logging

Paolo Bonzini <pbonzini@...hat.com> writes:

> On 04/05/2017 00:14, Bandan Das wrote:
>> +	if (vmx->nested.pml_full) {
>> +		exit_reason = EXIT_REASON_PML_FULL;
>> +		vmx->nested.pml_full = false;
>> +	} else if (fault->error_code & PFERR_RSVD_MASK)
>>  		exit_reason = EXIT_REASON_EPT_MISCONFIG;
>>  	else
>>  		exit_reason = EXIT_REASON_EPT_VIOLATION;
>> +	/*
>> +	 * The definition of bit 12 for EPT violations and PML
>> +	 * full event is the same, so pass it through since
>> +	 * the rest of the bits are undefined.
>> +	 */
>
> Please zero all other bits instead.  It's as easy as adding an "u64
> exit_qualification" local variable.

Will do, thanks for the review.

Bandan

> Paolo
>
>>  	nested_vmx_vmexit(vcpu, exit_reason, 0, vcpu->arch.exit_qualification);