linux-kernel - [RFC PATCH v1 0/6] Support nested SNP KVM guests on Hyper-V

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Date:   Mon, 23 Jan 2023 16:51:22 +0000
From:   Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        linux-hyperv@...r.kernel.org,
        Brijesh Singh <brijesh.singh@....com>,
        Michael Roth <michael.roth@....com>,
        Ashish Kalra <ashish.kalra@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        linux-crypto@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        iommu@...ts.linux.dev
Subject: [RFC PATCH v1 0/6] Support nested SNP KVM guests on Hyper-V

This patch series enables SNP-host support when running on Hyper-V, which
allows launching nested SNP guests. No guest or qemu changes are necessary
for this to work.

Patch 1 deals with allocating an RMP table which is not provided by
firmware/hypervisor. Patch 2 implements MSR-based rmpupdate/psmash instructions
which are meant for virtualized environments. Patch 3 maintains the rmptable
for internal kernel page tracking. Patch 4 makes sure that the kernel does not
disable SNP support during early CPU init. Patch 5 allows SNP initialization to
proceed when no iommus are available. Patch 6 adds a quirk in psp command
buffer handling, because of differences in SNP firmware spec interpretation.

This series depends on

- "Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support" (applies on top of RFC v7)
  https://lore.kernel.org/lkml/20221214194056.161492-1-michael.roth@amd.com/
- "Support ACPI PSP on Hyper-V"
  https://lore.kernel.org/lkml/20230123152250.26413-1-jpiotrowski@linux.microsoft.com/

Jeremi Piotrowski (6):
  x86/hyperv: Allocate RMP table during boot
  x86/sev: Add support for NestedVirtSnpMsr
  x86/sev: Maintain shadow rmptable on Hyper-V
  x86/amd: Configure necessary MSRs for SNP during CPU init when running
    as a guest
  iommu/amd: Don't fail snp_enable when running virtualized
  crypto: ccp - Introduce quirk to always reclaim pages after SEV-legacy
    commands

 arch/x86/hyperv/hv_init.c          |   5 ++
 arch/x86/include/asm/cpufeatures.h |   1 +
 arch/x86/include/asm/hyperv-tlfs.h |   3 +
 arch/x86/include/asm/mshyperv.h    |   3 +
 arch/x86/include/asm/msr-index.h   |   2 +
 arch/x86/include/asm/sev.h         |   2 +
 arch/x86/kernel/cpu/amd.c          |   8 +-
 arch/x86/kernel/cpu/mshyperv.c     |  41 ++++++++++
 arch/x86/kernel/sev.c              | 122 ++++++++++++++++++++++++++---
 drivers/crypto/ccp/sev-dev.c       |   6 +-
 drivers/crypto/ccp/sp-dev.h        |   4 +
 drivers/crypto/ccp/sp-platform.c   |   1 +
 drivers/iommu/amd/init.c           |   6 ++
 13 files changed, 191 insertions(+), 13 deletions(-)

-- 
2.25.1