[SRU][Jammy][PULL] Jammy update: v5.15.193 upstream stable release

[bethany.jamison at canonical.com]

This pull request (10 commits) includes the following Jammy stable patchsets:

        Jammy update: v5.15.193 upstream stable release
        https://bugs.launchpad.net/bugs/2127112

Note also that the 'stable-next' branch head contains this and all
prior pending upstream stable releases. I recommend fetching and
applying just this reference ('stable-next') instead of each
tags/jammy-stable-* reference:

  git://git.launchpad.net/~bjamison/+git/ubuntu-kernel-stable-jammy stable-next

 -Bethany Jamison

------------------------------------------------------------------------

The following changes since commit f3505b6f4f5ac8d45c490f9332abf14f78720f32:

  UBUNTU: Upstream stable to v5.15.192 (2025-10-08 10:59:32 -0500)

are available in the Git repository at:

  git://git.launchpad.net/~bjamison/+git/ubuntu-kernel-stable-jammy tags/jammy-stable-v5.15.193

for you to fetch changes up to d3c7c6a9c592d7d13e522f97278a6a8d92a5e74a:

  UBUNTU: Upstream stable to v5.15.193 (2025-10-08 12:50:18 -0500)

----------------------------------------------------------------
Bethany Jamison (2):
      UBUNTU: [Config] enable CONFIG_MITIGATION_VMSCAPE
      UBUNTU: Upstream stable to v5.15.193

Greg Kroah-Hartman (1):
      Linux 5.15.193

Pawan Gupta (7):
      Documentation/hw-vuln: Add VMSCAPE documentation
      x86/vmscape: Enumerate VMSCAPE bug
      x86/vmscape: Add conditional IBPB mitigation
      x86/vmscape: Enable the mitigation
      x86/bugs: Move cpu_bugs_smt_update() down
      x86/vmscape: Warn when STIBP is disabled with SMT
      x86/vmscape: Add old Intel CPUs to affected list

 Documentation/ABI/testing/sysfs-devices-system-cpu |   1 +
 Documentation/admin-guide/hw-vuln/index.rst        |   1 +
 Documentation/admin-guide/hw-vuln/vmscape.rst      | 110 +++++++++
 Documentation/admin-guide/kernel-parameters.txt    |  11 +
 Makefile                                           |   2 +-
 arch/x86/Kconfig                                   |   9 +
 arch/x86/include/asm/cpufeatures.h                 |   2 +
 arch/x86/include/asm/entry-common.h                |   7 +
 arch/x86/include/asm/nospec-branch.h               |   2 +
 arch/x86/kernel/cpu/bugs.c                         | 264 +++++++++++++++------
 arch/x86/kernel/cpu/common.c                       |  77 +++---
 arch/x86/kvm/x86.c                                 |   9 +
 debian.master/config/annotations                   |   1 +
 debian.master/upstream-stable                      |   2 +-
 drivers/base/cpu.c                                 |   6 +
 include/linux/cpu.h                                |   1 +
 16 files changed, 395 insertions(+), 110 deletions(-)
 create mode 100644 Documentation/admin-guide/hw-vuln/vmscape.rst