linux-kernel - [PATCH v2 0/9] Add AMD SEV page encryption bitmap support.

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Date:   Tue,  1 Dec 2020 00:45:16 +0000
From:   Ashish Kalra <Ashish.Kalra@....com>
To:     pbonzini@...hat.com
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        joro@...tes.org, bp@...e.de, thomas.lendacky@....com,
        x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        srutherford@...gle.com, brijesh.singh@....com,
        dovmurik@...ux.vnet.ibm.com, tobin@....com, jejb@...ux.ibm.com,
        frankeh@...ibm.com, dgilbert@...hat.com
Subject: [PATCH v2 0/9] Add AMD SEV page encryption bitmap support.

From: Ashish Kalra <ashish.kalra@....com>

The series add support for AMD SEV page encryption bitmap.

SEV guest VMs have the concept of private and shared memory. Private memory
is encrypted with the guest-specific key, while shared memory may be encrypted
with hypervisor key. The patch series introduces a new hypercall.
The guest OS can use this hypercall to notify the page encryption status.

The patch adds new ioctls KVM_{SET,GET}_PAGE_ENC_BITMAP. The ioctl can be used
by qemu to get the page encryption bitmap. Qemu can consult this bitmap
during guest live migration / page migration and/or guest debugging to know
whether the page is encrypted.

The page encryption bitmap support is required for SEV guest live migration,
guest page migration and guest debugging.

The patch-set also adds support for bypassing unencrypted guest memory
regions for DBG_DECRYPT API calls, guest memory region encryption status
in sev_dbg_decrypt() is now referenced using the page encryption bitmap.

A branch containing these patches is available here:
https://github.com/AMDESE/linux/tree/sev-page-encryption-bitmap-v2

Changes since v1:
 - Fix in sev_dbg_crypt() to release RCU read lock if hva_to_gfn() fails
   when bypassing DBG_DECRYPT API calls for unencrypted guest memory.
 - Comment fix for Patch 7/9. 

Ashish Kalra (4):
  KVM: SVM: Add support for static allocation of unified Page Encryption
    Bitmap.
  KVM: x86: Mark _bss_decrypted section variables as decrypted in page
    encryption bitmap.
  KVM: x86: Add kexec support for SEV page encryption bitmap.
  KVM: SVM: Bypass DBG_DECRYPT API calls for unecrypted guest memory.

Brijesh Singh (5):
  KVM: x86: Add AMD SEV specific Hypercall3
  KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall
  KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl
  mm: x86: Invoke hypercall when page encryption status is changed.
  KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl

 Documentation/virt/kvm/api.rst        |  71 ++++++
 Documentation/virt/kvm/hypercalls.rst |  15 ++
 arch/x86/include/asm/kvm_host.h       |   7 +
 arch/x86/include/asm/kvm_para.h       |  12 +
 arch/x86/include/asm/mem_encrypt.h    |   4 +
 arch/x86/include/asm/paravirt.h       |  10 +
 arch/x86/include/asm/paravirt_types.h |   2 +
 arch/x86/kernel/kvm.c                 |  28 +++
 arch/x86/kernel/kvmclock.c            |  12 +
 arch/x86/kernel/paravirt.c            |   1 +
 arch/x86/kvm/svm/sev.c                | 321 ++++++++++++++++++++++++++
 arch/x86/kvm/svm/svm.c                |   5 +
 arch/x86/kvm/svm/svm.h                |   7 +
 arch/x86/kvm/vmx/vmx.c                |   1 +
 arch/x86/kvm/x86.c                    |  35 +++
 arch/x86/mm/mem_encrypt.c             |  63 ++++-
 arch/x86/mm/pat/set_memory.c          |   7 +
 include/uapi/linux/kvm.h              |  13 ++
 include/uapi/linux/kvm_para.h         |   1 +
 19 files changed, 614 insertions(+), 1 deletion(-)

-- 
2.17.1