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From: Greg Kurz <groug@kaod.org>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: <brijesh.singh@amd.com>, <pair@us.ibm.com>, <dgilbert@redhat.com>,
	<pasic@linux.ibm.com>, <qemu-devel@nongnu.org>,
	<cohuck@redhat.com>,
	"Richard Henderson" <richard.henderson@linaro.org>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	David Hildenbrand <david@redhat.com>, <borntraeger@de.ibm.com>,
	Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,
	Paolo Bonzini <pbonzini@redhat.com>, <mst@redhat.com>,
	<jun.nakajima@intel.com>, <thuth@redhat.com>,
	<pragyansri.pathi@intel.com>, <kvm@vger.kernel.org>,
	Eduardo Habkost <ehabkost@redhat.com>, <qemu-s390x@nongnu.org>,
	<qemu-ppc@nongnu.org>, <frankja@linux.ibm.com>,
	<berrange@redhat.com>, <andi.kleen@intel.com>
Subject: Re: [PATCH v7 09/13] confidential guest support: Update documentation
Date: Thu, 14 Jan 2021 11:07:26 +0100	[thread overview]
Message-ID: <20210114110726.189ee7fa@bahia.lan> (raw)
In-Reply-To: <20210113235811.1909610-10-david@gibson.dropbear.id.au>

On Thu, 14 Jan 2021 10:58:07 +1100
David Gibson <david@gibson.dropbear.id.au> wrote:

> Now that we've implemented a generic machine option for configuring various
> confidential guest support mechanisms:
>   1. Update docs/amd-memory-encryption.txt to reference this rather than
>      the earlier SEV specific option
>   2. Add a docs/confidential-guest-support.txt to cover the generalities of
>      the confidential guest support scheme
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---

LGTM

Reviewed-by: Greg Kurz <groug@kaod.org>

>  docs/amd-memory-encryption.txt      |  2 +-
>  docs/confidential-guest-support.txt | 43 +++++++++++++++++++++++++++++
>  2 files changed, 44 insertions(+), 1 deletion(-)
>  create mode 100644 docs/confidential-guest-support.txt
> 
> diff --git a/docs/amd-memory-encryption.txt b/docs/amd-memory-encryption.txt
> index 80b8eb00e9..145896aec7 100644
> --- a/docs/amd-memory-encryption.txt
> +++ b/docs/amd-memory-encryption.txt
> @@ -73,7 +73,7 @@ complete flow chart.
>  To launch a SEV guest
>  
>  # ${QEMU} \
> -    -machine ...,memory-encryption=sev0 \
> +    -machine ...,confidential-guest-support=sev0 \
>      -object sev-guest,id=sev0,cbitpos=47,reduced-phys-bits=1
>  
>  Debugging
> diff --git a/docs/confidential-guest-support.txt b/docs/confidential-guest-support.txt
> new file mode 100644
> index 0000000000..2790425b38
> --- /dev/null
> +++ b/docs/confidential-guest-support.txt
> @@ -0,0 +1,43 @@
> +Confidential Guest Support
> +==========================
> +
> +Traditionally, hypervisors such as qemu have complete access to a
> +guest's memory and other state, meaning that a compromised hypervisor
> +can compromise any of its guests.  A number of platforms have added
> +mechanisms in hardware and/or firmware which give guests at least some
> +protection from a compromised hypervisor.  This is obviously
> +especially desirable for public cloud environments.
> +
> +These mechanisms have different names and different modes of
> +operation, but are often referred to as Secure Guests or Confidential
> +Guests.  We use the term "Confidential Guest Support" to distinguish
> +this from other aspects of guest security (such as security against
> +attacks from other guests, or from network sources).
> +
> +Running a Confidential Guest
> +----------------------------
> +
> +To run a confidential guest you need to add two command line parameters:
> +
> +1. Use "-object" to create a "confidential guest support" object.  The
> +   type and parameters will vary with the specific mechanism to be
> +   used
> +2. Set the "confidential-guest-support" machine parameter to the ID of
> +   the object from (1).
> +
> +Example (for AMD SEV)::
> +
> +    qemu-system-x86_64 \
> +        <other parameters> \
> +        -machine ...,confidential-guest-support=sev0 \
> +        -object sev-guest,id=sev0,cbitpos=47,reduced-phys-bits=1
> +
> +Supported mechanisms
> +--------------------
> +
> +Currently supported confidential guest mechanisms are:
> +
> +AMD Secure Encrypted Virtualization (SEV)
> +    docs/amd-memory-encryption.txt
> +
> +Other mechanisms may be supported in future.


  reply	other threads:[~2021-01-14 10:14 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-13 23:57 [PATCH v7 00/13] Generalize memory encryption models David Gibson
2021-01-13 23:57 ` [PATCH v7 01/13] qom: Allow optional sugar props David Gibson
2021-01-13 23:58 ` [PATCH v7 02/13] confidential guest support: Introduce new confidential guest support class David Gibson
2021-01-14  9:34   ` Daniel P. Berrangé
2021-01-14 10:42     ` David Gibson
2021-01-18 18:51   ` Dr. David Alan Gilbert
2021-01-21  1:06     ` David Gibson
2021-01-21  9:08       ` Dr. David Alan Gilbert
2021-01-29  2:32         ` David Gibson
2021-01-13 23:58 ` [PATCH v7 03/13] sev: Remove false abstraction of flash encryption David Gibson
2021-01-15 12:54   ` Cornelia Huck
2021-01-18  2:59     ` David Gibson
2021-01-13 23:58 ` [PATCH v7 04/13] confidential guest support: Move side effect out of machine_set_memory_encryption() David Gibson
2021-01-15 12:56   ` Cornelia Huck
2021-01-13 23:58 ` [PATCH v7 05/13] confidential guest support: Rework the "memory-encryption" property David Gibson
2021-01-15 13:06   ` Cornelia Huck
2021-01-13 23:58 ` [PATCH v7 06/13] sev: Add Error ** to sev_kvm_init() David Gibson
2021-01-13 23:58 ` [PATCH v7 07/13] confidential guest support: Introduce cgs "ready" flag David Gibson
2021-01-14  8:55   ` Greg Kurz
2021-01-15 13:12   ` Cornelia Huck
2021-01-18 19:47   ` Dr. David Alan Gilbert
2021-01-19  8:16     ` Cornelia Huck
2021-02-02  1:41       ` David Gibson
2021-01-13 23:58 ` [PATCH v7 08/13] confidential guest support: Move SEV initialization into arch specific code David Gibson
2021-01-15 13:24   ` Cornelia Huck
2021-01-18  3:03     ` David Gibson
2021-01-18  8:03       ` Cornelia Huck
2021-01-29  3:12         ` David Gibson
2021-01-13 23:58 ` [PATCH v7 09/13] confidential guest support: Update documentation David Gibson
2021-01-14 10:07   ` Greg Kurz [this message]
2021-01-15 15:36   ` Cornelia Huck
2021-01-29  2:36     ` David Gibson
2021-01-13 23:58 ` [PATCH v7 10/13] spapr: Add PEF based confidential guest support David Gibson
2021-01-15 15:41   ` Cornelia Huck
2021-01-29  2:43     ` David Gibson
2021-01-13 23:58 ` [PATCH v7 11/13] spapr: PEF: prevent migration David Gibson
2021-01-13 23:58 ` [PATCH v7 12/13] confidential guest support: Alter virtio default properties for protected guests David Gibson
2021-01-13 23:58 ` [PATCH v7 13/13] s390: Recognize confidential-guest-support option David Gibson
2021-01-14  9:10   ` Christian Borntraeger
2021-01-14  9:19     ` Christian Borntraeger
2021-01-14  9:24       ` Christian Borntraeger
2021-01-15  0:13         ` David Gibson
2021-01-14 11:45     ` David Gibson
2021-01-15 16:36   ` Cornelia Huck
2021-01-18 17:06     ` Christian Borntraeger

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