From: "Michael Kelley (LINUX)" <mikelley@microsoft.com>
To: Dave Hansen <dave.hansen@intel.com>, Borislav Petkov <bp@alien8.de>
Cc: "hpa@zytor.com" <hpa@zytor.com>,
KY Srinivasan <kys@microsoft.com>,
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Subject: RE: [PATCH v5 06/14] x86/ioremap: Support hypervisor specified range to map as encrypted
Date: Thu, 9 Feb 2023 17:47:07 +0000 [thread overview]
Message-ID: <BYAPR21MB16886D92828BA2CA8D47FEA4D7D99@BYAPR21MB1688.namprd21.prod.outlook.com> (raw)
In-Reply-To: <4216dea6-d899-aecb-2207-caa2ae7db0e3@intel.com>
From: Dave Hansen <dave.hansen@intel.com> Sent: Wednesday, February 8, 2023 9:24 AM
>
> On 2/7/23 04:41, Borislav Petkov wrote:
> > Or are there no similar TDX solutions planned where the guest runs
> > unmodified and under a paravisor?
>
> I actually don't think paravisors make *ANY* sense for Linux. If you
> have to modify the guest, then just modify it to talk to the hypervisor
> directly. This code is... modifying the guest. What does putting a
> paravisor in the middle do for you?
One of the original goals of the paravisor was to make fewer
modifications to the guest, especially in areas that aren't directly related
to the hypervisor. It's arguable as to whether that goal played out in
reality.
But another significant goal is to be able to move some device emulation
from the hypervisor/VMM to the guest context. In a CoCo VM, this move
is from outside the TCB to inside the TCB. A great example is a virtual
TPM. Per the CoCo VM threat model, a guest can't rely on a vTPM
provided by the host. But a guest *can* rely on a vTPM implemented in
a more privileged layer of the guest context. With CoCo VMs in the
Azure public cloud, the paravisor also provides other device emulation, like
the IO-APIC to solve some of the ugly interrupt delivery issues. In a
complete solution, it should be possible for a customer to provide his
own paravisor, or at least to inspect/audit the vendor-provided paravisor
code so that it can be certified against whatever security standards the
customer requires. For Azure CoCo VMs, this part is a work-in-progress.
This could turn into an extended discussion, and I've given only a
fairly high-level answer. There are architects at Microsoft who could
probably give a better rendition of why we've pursued the paravisor
approach with SEV-SNP guests.
Michael
>
> It might help with binary drivers, but we don't do upstream kernel work
> to make silly binary Linux drivers happy.
>
> So, no, there's no similar TDX solutions planned, at least for Linux
> guests. Unless I missed the memo. Kirill?
next prev parent reply other threads:[~2023-02-09 17:47 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-12 21:42 [PATCH v5 00/14] Add PCI pass-thru support to Hyper-V Confidential VMs Michael Kelley
2023-01-12 21:42 ` [PATCH v5 01/14] x86/ioapic: Gate decrypted mapping on cc_platform_has() attribute Michael Kelley
2023-01-12 21:42 ` [PATCH v5 02/14] x86/hyperv: Reorder code to facilitate future work Michael Kelley
2023-01-12 21:42 ` [PATCH v5 03/14] Drivers: hv: Explicitly request decrypted in vmap_pfn() calls Michael Kelley
2023-01-12 21:42 ` [PATCH v5 04/14] x86/mm: Handle decryption/re-encryption of bss_decrypted consistently Michael Kelley
2023-01-12 21:42 ` [PATCH v5 05/14] init: Call mem_encrypt_init() after Hyper-V hypercall init is done Michael Kelley
2023-01-12 21:42 ` [PATCH v5 06/14] x86/ioremap: Support hypervisor specified range to map as encrypted Michael Kelley
2023-01-20 20:15 ` Borislav Petkov
2023-01-21 4:10 ` Michael Kelley (LINUX)
2023-01-25 14:55 ` Borislav Petkov
2023-02-02 5:49 ` Michael Kelley (LINUX)
2023-02-07 12:41 ` Borislav Petkov
2023-02-07 19:01 ` Michael Kelley (LINUX)
2023-02-07 19:33 ` Borislav Petkov
2023-02-07 19:48 ` Michael Kelley (LINUX)
2023-02-07 19:54 ` Borislav Petkov
2023-02-07 19:57 ` Michael Kelley (LINUX)
2023-02-08 0:18 ` Michael Kelley (LINUX)
2023-02-08 15:09 ` Dave Hansen
2023-02-09 17:29 ` Michael Kelley (LINUX)
2023-02-08 17:23 ` Dave Hansen
2023-02-09 17:47 ` Michael Kelley (LINUX) [this message]
2023-02-10 18:41 ` Sean Christopherson
2023-02-10 18:58 ` Dave Hansen
2023-02-10 19:03 ` Borislav Petkov
2023-02-10 19:15 ` Michael Kelley (LINUX)
2023-02-10 19:36 ` Borislav Petkov
2023-02-10 19:58 ` Dave Hansen
2023-02-10 20:50 ` Sean Christopherson
2023-02-10 20:57 ` Sean Christopherson
2023-02-10 21:27 ` Michael Kelley (LINUX)
2023-02-10 23:47 ` Sean Christopherson
2023-02-14 7:45 ` Michael Kelley (LINUX)
2023-02-16 13:32 ` Borislav Petkov
2023-02-16 16:16 ` Michael Kelley (LINUX)
2023-02-16 17:06 ` Borislav Petkov
2023-02-17 6:16 ` Michael Kelley (LINUX)
2023-02-17 14:55 ` Borislav Petkov
2023-02-22 22:13 ` Sean Christopherson
2023-02-22 22:33 ` Borislav Petkov
2023-02-22 22:54 ` Sean Christopherson
2023-02-22 23:34 ` Borislav Petkov
2023-02-23 1:21 ` Sean Christopherson
2023-02-23 10:45 ` Borislav Petkov
2023-02-23 20:01 ` Michael Kelley (LINUX)
2023-02-23 20:27 ` Dave Hansen
2023-03-06 21:51 ` Borislav Petkov
2023-03-09 11:12 ` David Woodhouse
2023-03-09 11:59 ` Borislav Petkov
2023-03-09 13:00 ` David Woodhouse
2023-03-09 14:19 ` Tom Lendacky
2023-03-09 14:36 ` Jörg Rödel
2023-03-09 14:45 ` Borislav Petkov
2023-03-09 15:45 ` David Woodhouse
2023-03-09 16:34 ` Borislav Petkov
2023-03-10 10:05 ` David Woodhouse
2023-02-23 20:26 ` Dave Hansen
2023-02-23 20:41 ` Dave Hansen
2023-02-23 20:51 ` Michael Kelley (LINUX)
2023-02-23 21:07 ` Sean Christopherson
2023-02-23 21:15 ` Michael Kelley (LINUX)
2023-02-23 21:24 ` Dave Hansen
2023-01-12 21:42 ` [PATCH v5 07/14] x86/hyperv: Change vTOM handling to use standard coco mechanisms Michael Kelley
2023-01-12 21:42 ` [PATCH v5 08/14] swiotlb: Remove bounce buffer remapping for Hyper-V Michael Kelley
2023-01-12 21:42 ` [PATCH v5 09/14] Drivers: hv: vmbus: Remove second mapping of VMBus monitor pages Michael Kelley
2023-01-12 21:42 ` [PATCH v5 10/14] Drivers: hv: vmbus: Remove second way of mapping ring buffers Michael Kelley
2023-01-12 21:42 ` [PATCH v5 11/14] hv_netvsc: Remove second mapping of send and recv buffers Michael Kelley
2023-01-12 21:42 ` [PATCH v5 12/14] Drivers: hv: Don't remap addresses that are above shared_gpa_boundary Michael Kelley
2023-01-12 21:42 ` [PATCH v5 13/14] PCI: hv: Add hypercalls to read/write MMIO space Michael Kelley
2023-01-12 21:42 ` [PATCH v5 14/14] PCI: hv: Enable PCI pass-thru devices in Confidential VMs Michael Kelley
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