linux-kernel - [RFC PATCH V4 00/17] x86/hyperv/sev: Add AMD sev-snp enlightened guest support on hyperv

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Date:   Mon,  3 Apr 2023 13:43:48 -0400
From:   Tianyu Lan <ltykernel@...il.com>
To:     luto@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, seanjc@...gle.com, pbonzini@...hat.com,
        jgross@...e.com, tiala@...rosoft.com, kirill@...temov.name,
        jiangshan.ljs@...group.com, peterz@...radead.org,
        ashish.kalra@....com, srutherford@...gle.com,
        akpm@...ux-foundation.org, anshuman.khandual@....com,
        pawan.kumar.gupta@...ux.intel.com, adrian.hunter@...el.com,
        daniel.sneddon@...ux.intel.com, alexander.shishkin@...ux.intel.com,
        sandipan.das@....com, ray.huang@....com, brijesh.singh@....com,
        michael.roth@....com, thomas.lendacky@....com,
        venu.busireddy@...cle.com, sterritt@...gle.com,
        tony.luck@...el.com, samitolvanen@...gle.com, fenghua.yu@...el.com
Cc:     pangupta@....com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: [RFC PATCH V4 00/17] x86/hyperv/sev: Add AMD sev-snp enlightened guest support on hyperv

From: Tianyu Lan <tiala@...rosoft.com>


This patchset is to add AMD sev-snp enlightened guest
support on hyperv. Hyperv uses Linux direct boot mode
to boot up Linux kernel and so it needs to pvalidate
system memory by itself.

In hyperv case, there is no boot loader and so cc blob
is prepared by hypervisor. In this series, hypervisor
set the cc blob address directly into boot parameter
of Linux kernel. If the magic number on cc blob address
is valid, kernel will read cc blob.

Shared memory between guests and hypervisor should be
decrypted and zero memory after decrypt memory. The data
in the target address. It maybe smearedto avoid smearing
data.

Introduce #HV exception support in AMD sev snp code and
#HV handler.

Change since v3:
       - Replace struct sev_es_save_area with struct vmcb_save_area
       - Move smp, cpu and memory enumerating code from mshyperv.c to ivm.c
       - Handle nested entry case of do_exc_hv() case.
       - Check NMI event when irq is disabled

Change since v2:
       - Remove validate kernel memory code at boot stage
       - Split #HV page patch into two parts
       - Remove HV-APIC change due to enable x2apic from
       	 host side
       - Rework vmbus code to handle error of decrypt page
       - Spilt memory and cpu initialization patch. 
Change since v1:
       - Remove boot param changes for cc blob address and
       use setup head to pass cc blob info
       - Remove unnessary WARN and BUG check
       - Add system vector table map in the #HV exception
       - Fix interrupt exit issue when use #HV exception

Ashish Kalra (2):
  x86/sev: optimize system vector processing invoked from #HV exception
  x86/sev: Fix interrupt exit code paths from #HV exception

Tianyu Lan (15):
  x86/hyperv: Add sev-snp enlightened guest static key
  Drivers: hv: vmbus: Decrypt vmbus ring buffer
  x86/hyperv: Set Virtual Trust Level in VMBus init message
  x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp
    enlightened guest
  clocksource/drivers/hyper-v: decrypt hyperv tsc page in sev-snp
    enlightened guest
  x86/hyperv: decrypt VMBus pages for sev-snp enlightened guest
  drivers: hv: Decrypt percpu hvcall input arg page in sev-snp
    enlightened guest
  x86/hyperv: Initialize cpu and memory for sev-snp enlightened guest
  x86/hyperv: SEV-SNP enlightened guest don't support legacy rtc
  x86/hyperv: Add smp support for sev-snp guest
  x86/hyperv: Add hyperv-specific handling for VMMCALL under SEV-ES
  x86/sev: Add a #HV exception handler
  x86/sev: Add Check of #HV event in path
  x86/hyperv/sev: Add AMD sev-snp enlightened guest support on hyperv
  x86/sev: Remove restrict interrupt injection from
    SNP_FEATURES_IMPL_REQ

 arch/x86/boot/compressed/sev.c        |   1 -
 arch/x86/entry/entry_64.S             |  84 ++++++
 arch/x86/hyperv/hv_init.c             |  42 +++
 arch/x86/hyperv/ivm.c                 | 181 ++++++++++++
 arch/x86/include/asm/cpu_entry_area.h |   6 +
 arch/x86/include/asm/hyperv-tlfs.h    |   7 +
 arch/x86/include/asm/idtentry.h       | 105 ++++++-
 arch/x86/include/asm/irqflags.h       |  11 +
 arch/x86/include/asm/mem_encrypt.h    |   2 +
 arch/x86/include/asm/mshyperv.h       |  81 ++++-
 arch/x86/include/asm/page_64_types.h  |   1 +
 arch/x86/include/asm/sev.h            |  13 +
 arch/x86/include/asm/svm.h            |  15 +-
 arch/x86/include/asm/trapnr.h         |   1 +
 arch/x86/include/asm/traps.h          |   1 +
 arch/x86/include/asm/x86_init.h       |   2 +
 arch/x86/include/uapi/asm/svm.h       |   4 +
 arch/x86/kernel/cpu/common.c          |   1 +
 arch/x86/kernel/cpu/mshyperv.c        |  42 ++-
 arch/x86/kernel/dumpstack_64.c        |   9 +-
 arch/x86/kernel/idt.c                 |   1 +
 arch/x86/kernel/sev.c                 | 407 ++++++++++++++++++++++----
 arch/x86/kernel/traps.c               |  42 +++
 arch/x86/kernel/vmlinux.lds.S         |   7 +
 arch/x86/kernel/x86_init.c            |   4 +-
 arch/x86/mm/cpu_entry_area.c          |   2 +
 drivers/clocksource/hyperv_timer.c    |   2 +-
 drivers/hv/connection.c               |   1 +
 drivers/hv/hv.c                       |  42 ++-
 drivers/hv/hv_common.c                |  27 +-
 include/asm-generic/hyperv-tlfs.h     |  19 ++
 include/asm-generic/mshyperv.h        |   2 +
 include/linux/hyperv.h                |   4 +-
 33 files changed, 1092 insertions(+), 77 deletions(-)

-- 
2.25.1