linux-kernel - [PATCH v2 0/3] SEV-ES TSC_AUX virtualization fix and optimization

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 15 Sep 2023 15:54:29 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <x86@...nel.org>
CC:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Babu Moger <babu.moger@....com>
Subject: [PATCH v2 0/3] SEV-ES TSC_AUX virtualization fix and optimization

This patch series provides fixes to the TSC_AUX virtualization support
and an optimization to reduce the number of WRMSRs to TSC_AUX when
it is virtualized.

---

Changes since v1:
- Move TSC_AUX virtualization support out of init_vmcb_after_set_cpuid()
  path and into the vcpu_after_set_cpuid() path
- Add an additional patch to properly set or clear intercepts based
  on TSC_AUX virtualization requirements
- Simplify the TSC_AUX virtualization optimization to set the host save
  area TSC_AUX value once during svm_hardware_enable().
- Since the TSC_AUX virtualization can't be disabled for an SEV-ES guest,
  eliminate the "v_tsc_aux" flag and check against the host feature and
  type of guest, directly.

Patches based on https://git.kernel.org/pub/scm/virt/kvm/kvm.git master
and commit:
  7c7cce2cf7ee ("Merge tag 'kvmarm-fixes-6.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD")

Tom Lendacky (3):
  KVM: SVM: Fix TSC_AUX virtualization setup
  KVM: SVM: Fix TSC_AUX virtualization intercept update logic
  KVM: SVM: Do not use user return MSR support for virtualized TSC_AUX

 arch/x86/kvm/svm/sev.c | 34 +++++++++++++++++++++++++--------
 arch/x86/kvm/svm/svm.c | 43 ++++++++++++++++++++++++++++++++++--------
 arch/x86/kvm/svm/svm.h |  1 +
 3 files changed, 62 insertions(+), 16 deletions(-)

-- 
2.41.0