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Kashyap Chamarthy 3b2c52c017 qemu-cpu-models.rst: Document -noTSX, mds-no, taa-no, and tsx-ctrl 
- Add the '-noTSX' variants for CascadeLake and SkyLake.

- Document the three MSR bits: 'mds-no', 'taa-no', and 'tsx-ctrl'

  Two confusing things about 'mds-no' (and the first point applies to
  the other two MSRs too):

  (1) The 'mds-no' bit will _not_ show up in the guest's /proc/cpuinfo.
      Rather it is used to fill in the guest's sysfs:

        /sys/devices/system/cpu/vulnerabilities/mds:Not affected

      Paolo confirmed on IRC as such.

  (2) There are _three_ variants[+] of CascadeLake CPUs, with different
      stepping levels: 5, 6, and 7.  To quote wikichip.org[*]:

        "note that while steppings 6 & 7 are fully mitigated, earlier
        stepping 5 is not protected against MSBDS, MLPDS, nor MDSUM"

      The above is also indicated in the Intel's document[+], as
      indicated by "No" under the three columns of MFBDS, MSBDS, and
      MLPDS.

  I've expressed this in the docs without belabouring the details.

      [+] https://software.intel.com/security-software-guidance/insights/processors-affected-microarchitectural-data-sampling
      [*] https://en.wikichip.org/wiki/intel/microarchitectures/cascade_lake#Key_changes_from_Skylake

Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
Message-Id: <20200225165618.6571-3-kchamart@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-03-16 23:02:25 +01:00
..
arm docs: add Orange Pi PC document 2020-03-12 16:27:33 +00:00
build-platforms.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
conf.py docs: Generate qemu.1 manpage with Sphinx 2020-03-06 11:06:55 +00:00
cpu-models-mips.rst.inc docs/system: Convert qemu-cpu-models.texi to rST 2020-03-06 10:05:12 +00:00
cpu-models-x86.rst.inc qemu-cpu-models.rst: Document -noTSX, mds-no, taa-no, and tsx-ctrl 2020-03-16 23:02:25 +01:00
deprecated.rst net: Remove deprecated [hub_id name] tuple of 'hostfwd_add' / 'hostfwd_remove' 2020-03-09 18:44:04 +00:00
device-url-syntax.rst.inc docs: Split out sections for the manpage into .rst.inc files 2020-03-06 11:06:55 +00:00
gdb.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
images.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
index.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
invocation.rst docs: Split out sections for the manpage into .rst.inc files 2020-03-06 11:06:55 +00:00
ivshmem.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
keys.rst docs: Split out sections for the manpage into .rst.inc files 2020-03-06 11:06:55 +00:00
keys.rst.inc docs: Split out sections for the manpage into .rst.inc files 2020-03-06 11:06:55 +00:00
license.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
linuxboot.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
managed-startup.rst docs/system: convert managed startup to rST. 2020-03-06 10:05:12 +00:00
monitor.rst hmp-commands-info.hx: Add rST documentation fragments 2020-03-06 10:05:12 +00:00
mux-chardev.rst docs: Split out sections for the manpage into .rst.inc files 2020-03-06 11:06:55 +00:00
mux-chardev.rst.inc docs: Split out sections for the manpage into .rst.inc files 2020-03-06 11:06:55 +00:00
net.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
qemu-block-drivers.rst docs: Create defs.rst.inc as a place to define substitutions 2020-03-06 10:04:58 +00:00
qemu-block-drivers.rst.inc
qemu-cpu-models.rst docs/system: Convert qemu-cpu-models.texi to rST 2020-03-06 10:05:12 +00:00
qemu-manpage.rst docs: Generate qemu.1 manpage with Sphinx 2020-03-06 11:06:55 +00:00
quickstart.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
security.rst docs/system: Convert security.texi to rST format 2020-03-06 10:05:12 +00:00
target-arm.rst docs: add Orange Pi PC document 2020-03-12 16:27:33 +00:00
target-i386-desc.rst.inc docs: Split out sections for the manpage into .rst.inc files 2020-03-06 11:06:55 +00:00
target-i386.rst docs: Split out sections for the manpage into .rst.inc files 2020-03-06 11:06:55 +00:00
target-m68k.rst docs: Roll semihosting option information into qemu-options.hx 2020-03-06 10:05:12 +00:00
target-mips.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
target-ppc.rst docs: Roll -prom-env and -g target-specific info into qemu-options.hx 2020-03-06 10:05:18 +00:00
target-sparc64.rst docs: Roll -prom-env and -g target-specific info into qemu-options.hx 2020-03-06 10:05:18 +00:00
target-sparc.rst docs: Roll -prom-env and -g target-specific info into qemu-options.hx 2020-03-06 10:05:18 +00:00
target-xtensa.rst docs: Roll semihosting option information into qemu-options.hx 2020-03-06 10:05:12 +00:00
targets.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
tls.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
usb.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00
vfio-ap.rst
vnc-security.rst docs/system: convert Texinfo documentation to rST 2020-03-06 10:05:12 +00:00