linux-kernel - [PATCH kernel v3 0/3] KVM: SEV: Enable AMD SEV-ES DebugSwap

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Date:   Fri, 20 Jan 2023 14:10:44 +1100
From:   Alexey Kardashevskiy <aik@....com>
To:     Alexey Kardashevskiy <aik@....com>
CC:     <kvm@...r.kernel.org>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>, Yury Norov <yury.norov@...il.com>,
        Venu Busireddy <venu.busireddy@...cle.com>,
        Tony Luck <tony.luck@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Sean Christopherson" <seanjc@...gle.com>,
        Sandipan Das <sandipan.das@....com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Michael Roth <michael.roth@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Kim Phillips <kim.phillips@....com>,
        Kees Cook <keescook@...omium.org>,
        Juergen Gross <jgross@...e.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Borislav Petkov <bp@...en8.de>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH kernel v3 0/3] KVM: SEV: Enable AMD SEV-ES DebugSwap

This is to use another AMD SEV-ES hardware assisted register swap,
more detail in 2/3. The patches are fairly independend but required in
this order.

The previous conversation is here:
https://lore.kernel.org/all/20221209043804.942352-1-aik@amd.com/

This is based on sha1
195df42eb64d Ingo Molnar "Merge branch into tip/master: 'x86/platform'"
in order to have recently added X86_FEATURE_NO_NESTED_DATA_BP cpu
feature.

Please comment. Thanks.



Alexey Kardashevskiy (3):
  x86/amd: Cache debug register values in percpu variables
  KVM: SEV: Enable data breakpoints in SEV-ES
  x86/sev: Do not handle #VC for DR7 read/write

 arch/x86/include/asm/debugreg.h        |  9 +++-
 arch/x86/include/asm/msr-index.h       |  1 +
 arch/x86/include/asm/svm.h             |  1 +
 arch/x86/kvm/svm/svm.h                 | 16 +++++--
 tools/arch/x86/include/asm/msr-index.h |  1 +
 arch/x86/kernel/cpu/amd.c              | 47 ++++++++++++++------
 arch/x86/kernel/hw_breakpoint.c        |  4 +-
 arch/x86/kernel/sev.c                  |  6 +++
 arch/x86/kvm/svm/sev.c                 | 29 ++++++++++++
 arch/x86/kvm/svm/svm.c                 |  3 +-
 10 files changed, 94 insertions(+), 23 deletions(-)

-- 
2.38.1