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Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when SEV is active

From Paolo Bonzini <pbonzini@redhat.com>
Newsgroups linux.kernel
Subject Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when SEV is active
Date 2016-09-22 19:10 +0200
Message-ID <skfFv-Hc-7@gated-at.bofh.it> (permalink)
References (2 earlier) <skdkl-7zs-15@gated-at.bofh.it> <skdu1-7CL-19@gated-at.bofh.it> <skdNn-7ZV-17@gated-at.bofh.it> <skdNn-7ZV-15@gated-at.bofh.it> <skfFv-Hc-9@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On 22/09/2016 19:07, Borislav Petkov wrote:
>> Which paragraph?
> "Linux relies on BIOS to set this bit if BIOS has determined that the
> reduction in the physical address space as a result of enabling memory
> encryption..."
> 
> Basically, you can enable SME in the BIOS and you're all set.

That's not how I read it.  I just figured that the BIOS has some magic
things high in the physical address space and if you reduce the physical
address space the BIOS (which is called from e.g. EFI runtime services)
would have problems with that.

Paolo

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Thread

Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Borislav Petkov <bp@suse.de> - 2016-09-22 16:40 +0200
  Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Paolo Bonzini <pbonzini@redhat.com> - 2016-09-22 16:50 +0200
    Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Paolo Bonzini <pbonzini@redhat.com> - 2016-09-22 17:10 +0200
      Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Paolo Bonzini <pbonzini@redhat.com> - 2016-09-22 19:10 +0200
        Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Borislav Petkov <bp@suse.de> - 2016-09-22 19:30 +0200
      Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Borislav Petkov <bp@suse.de> - 2016-09-22 19:10 +0200
        Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Borislav Petkov <bp@suse.de> - 2016-09-22 21:20 +0200
          Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Borislav Petkov <bp@suse.de> - 2016-09-22 22:20 +0200
    Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Borislav Petkov <bp@suse.de> - 2016-09-22 17:10 +0200
    Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Paolo Bonzini <pbonzini@redhat.com> - 2016-09-22 21:00 +0200
  Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Paolo Bonzini <pbonzini@redhat.com> - 2016-09-22 20:30 +0200
    Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Borislav Petkov <bp@suse.de> - 2016-09-22 20:40 +0200
      Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Kai Huang <kaih.linux@gmail.com> - 2016-09-23 11:40 +0200
        Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when  SEV is active Borislav Petkov <bp@suse.de> - 2016-09-23 12:00 +0200

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