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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 2016-06-29 10:20 +0200
Message-ID <rPiSZ-1Lg-11@gated-at.bofh.it> (permalink)
References <rOSYx-1Xl-7@gated-at.bofh.it> <rOSYx-1Xl-9@gated-at.bofh.it> <rPemm-7iT-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On 29/06/2016 05:17, Xiao Guangrong wrote:
>>
>> +++ b/arch/x86/kvm/mmu.c
>> @@ -2516,13 +2516,17 @@ static int set_spte(struct kvm_vcpu *vcpu, u64
>> *sptep,
>>               gfn_t gfn, kvm_pfn_t pfn, bool speculative,
>>               bool can_unsync, bool host_writable)
>>   {
>> -    u64 spte;
>> +    u64 spte = 0;
>>       int ret = 0;
>> +    struct kvm_mmu *context = &vcpu->arch.mmu;
>> +    bool execonly = !(context->guest_rsvd_check.bad_mt_xwr &
>> +              (1ull << VMX_EPT_EXECUTABLE_MASK));
> 
> Could we introduce a new field, say execonly, to "struct kvm_mmu"?
> That would make the code be more clearer.

Given how execonly is used, let's add shadow_present_mask instead.

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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