From: Andi Kleen <ak@linux.intel.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: "Kuppuswamy,
Sathyanarayanan" <sathyanarayanan.kuppuswamy@linux.intel.com>,
Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Linux PCI <linux-pci@vger.kernel.org>,
linux-mips@vger.kernel.org,
James E J Bottomley <James.Bottomley@hansenpartnership.com>,
Dave Hansen <dave.hansen@intel.com>,
Peter H Anvin <hpa@zytor.com>,
sparclinux@vger.kernel.org, Rajat Jain <rajatja@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-arch <linux-arch@vger.kernel.org>,
Jonathan Corbet <corbet@lwn.net>, Helge Deller <deller@gmx.de>,
X86 ML <x86@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Arnd Bergmann <arnd@arndb.de>, Tony Luck <tony.luck@intel.com>,
Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
Dan Williams <dan.j.williams@intel.com>,
virtualization@lists.linux-foundation.org,
Richard Henderson <rth@twiddle.net>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
linux-parisc@vger.kernel.org,
Sean Christopherson <seanjc@google.com>,
Linux Doc Mailing List <linux-doc@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-alpha@vger.kernel.org,
"David S . Miller" <davem@davemloft.net>,
Kirill Shutemov <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH v4 11/15] pci: Add pci_iomap_shared{,_range}
Date: Tue, 24 Aug 2021 13:14:02 -0700 [thread overview]
Message-ID: <a80fc61a-bc55-b82c-354b-b57863ab03db@linux.intel.com> (raw)
In-Reply-To: <20210824185541.GA3485816@bjorn-Precision-5520>
On 8/24/2021 11:55 AM, Bjorn Helgaas wrote:
> [+cc Rajat; I still don't know what "shared memory with a hypervisor
> in a confidential guest" means,
A confidential guest is a guest which uses memory encryption to isolate
itself from the host. It doesn't trust the host. But it still needs to
communicate with the host for IO, so it has some special memory areas
that are explicitly marked shared. These are used to do IO with the
host. All their usage needs to be carefully hardened to avoid any
security attacks on the guest, that's why we want to limit this
interaction only to a small set of hardened drivers. For MMIO, the set
is currently only virtio and MSI-X.
-Andi
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next prev parent reply other threads:[~2021-08-24 20:14 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210805005218.2912076-1-sathyanarayanan.kuppuswamy@linux.intel.com>
[not found] ` <20210805005218.2912076-11-sathyanarayanan.kuppuswamy@linux.intel.com>
2021-08-12 19:46 ` [PATCH v4 10/15] asm/io.h: Add ioremap_shared fallback Bjorn Helgaas
2021-08-13 7:58 ` Christoph Hellwig
[not found] ` <20210805005218.2912076-12-sathyanarayanan.kuppuswamy@linux.intel.com>
2021-08-13 8:02 ` [PATCH v4 11/15] pci: Add pci_iomap_shared{,_range} Christoph Hellwig
2021-08-23 23:56 ` Michael S. Tsirkin
[not found] ` <26a3cce5-ddf7-cbe6-a41e-58a2aea48f78@linux.intel.com>
2021-08-24 1:04 ` Dan Williams
2021-08-24 2:14 ` Andi Kleen
2021-08-24 9:47 ` Michael S. Tsirkin
2021-08-24 17:20 ` Andi Kleen
2021-08-24 18:55 ` Bjorn Helgaas
2021-08-24 20:14 ` Andi Kleen [this message]
2021-08-24 20:31 ` Bjorn Helgaas
2021-08-24 20:50 ` Andi Kleen
2021-08-24 21:05 ` Dan Williams
2021-08-25 14:52 ` Bjorn Helgaas
2021-08-29 15:27 ` Michael S. Tsirkin
2021-08-29 16:17 ` Andi Kleen
2021-08-29 22:26 ` Michael S. Tsirkin
2021-08-30 5:11 ` Andi Kleen
2021-08-30 20:59 ` Michael S. Tsirkin
2021-08-31 0:23 ` Andi Kleen
2021-09-10 9:54 ` Michael S. Tsirkin
2021-09-10 16:34 ` Andi Kleen
2021-09-11 23:54 ` Michael S. Tsirkin
2021-09-13 5:53 ` Michael S. Tsirkin
2021-09-24 22:43 ` Andi Kleen
2021-09-27 9:07 ` Michael S. Tsirkin
[not found] ` <CACK8Z6E+__kZqU8mVUnYhFc0wz_e81qBLO3ffqSDghVtztNeQw@mail.gmail.com>
2021-08-24 21:59 ` Dan Williams
2021-08-24 7:07 ` Christoph Hellwig
2021-08-24 17:04 ` Andi Kleen
2021-08-29 15:34 ` Michael S. Tsirkin
2021-08-29 16:43 ` Andi Kleen
2021-08-24 9:12 ` Michael S. Tsirkin
[not found] ` <20210805005218.2912076-13-sathyanarayanan.kuppuswamy@linux.intel.com>
2021-08-13 8:07 ` [PATCH v4 12/15] pci: Mark MSI data shared Christoph Hellwig
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