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Re: [PATCH 3/5] mmu: don't set the present bit unconditionally

From Paolo Bonzini <pbonzini@redhat.com>
Newsgroups linux.kernel
Subject Re: [PATCH 3/5] mmu: don't set the present bit unconditionally
Date 2016-07-05 13:00 +0200
Message-ID <rRwf8-1IO-5@gated-at.bofh.it> (permalink)
References <rOSYx-1Xl-7@gated-at.bofh.it> <rOSYx-1Xl-9@gated-at.bofh.it> <rOX2a-4Ab-35@gated-at.bofh.it> <rRryN-79U-13@gated-at.bofh.it>
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On 05/07/2016 07:50, Wanpeng Li wrote:
>> > This needs a comment:
>> >
>> >         /*
>> >          * There are two cases in which execonly is false: 1) for
>> >          * non-EPT page tables, in which case we need to set the
>> >          * P bit; 2) for EPT page tables where an X-- page table
> In the scenario of non-EPT shadow page table and non-nested, the
> present bit can't be set any more since
> context->guest_rsvd_check.bad_mt_xwr is always 0.

This will be fixed with a new shadow_present_mask variable.

Paolo

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Thread

[PATCH 3/5] mmu: don't set the present bit unconditionally Bandan Das <bsd@redhat.com> - 2016-06-28 06:40 +0200
  Re: [PATCH 3/5] mmu: don't set the present bit unconditionally Paolo Bonzini <pbonzini@redhat.com> - 2016-06-28 11:00 +0200
    Re: [PATCH 3/5] mmu: don't set the present bit unconditionally Bandan Das <bsd@redhat.com> - 2016-06-28 19:50 +0200
      Re: [PATCH 3/5] mmu: don't set the present bit unconditionally Paolo Bonzini <pbonzini@redhat.com> - 2016-06-28 22:30 +0200
    Re: [PATCH 3/5] mmu: don't set the present bit unconditionally Wanpeng Li <kernellwp@gmail.com> - 2016-07-05 08:00 +0200
      Re: [PATCH 3/5] mmu: don't set the present bit unconditionally Paolo Bonzini <pbonzini@redhat.com> - 2016-07-05 13:00 +0200
  Re: [PATCH 3/5] mmu: don't set the present bit unconditionally Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-06-29 05:30 +0200
    Re: [PATCH 3/5] mmu: don't set the present bit unconditionally Paolo Bonzini <pbonzini@redhat.com> - 2016-06-29 10:20 +0200
      Re: [PATCH 3/5] mmu: don't set the present bit unconditionally Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-06-30 09:30 +0200

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