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author | Peter Maydell <peter.maydell@linaro.org> | 2023-03-21 14:09:34 +0000 |
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committer | Peter Maydell <peter.maydell@linaro.org> | 2023-03-21 14:09:34 +0000 |
commit | 8de6e6e12e623ea402274d4cf24de20ed7e40717 (patch) | |
tree | cff4fa0dd52eb546af35b3c23221a6d3a6000e5e /docs | |
parent | 42d55ab1706912bd21c916dc818279f113ae2791 (diff) | |
parent | 5787d17a42f7af4bd117e5d6bfa54b1fdf93c255 (diff) | |
download | qemu-8de6e6e12e623ea402274d4cf24de20ed7e40717.zip qemu-8de6e6e12e623ea402274d4cf24de20ed7e40717.tar.gz qemu-8de6e6e12e623ea402274d4cf24de20ed7e40717.tar.bz2 |
Merge tag 'pull-target-arm-20230321' of https://git.linaro.org/people/pmaydell/qemu-arm into staging
target-arm queue:
* contrib/elf2dmp: Support Windows Server 2022
* hw/char/cadence_uart: Fix guards on invalid BRGR/BDIV settings
* target/arm: Add Neoverse-N1 IMPDEF registers
* hw/usb/imx: Fix out of bounds access in imx_usbphy_read()
* docs/system/arm/cpu-features.rst: Fix formatting
* target/arm: Don't advertise aarch64-pauth.xml to gdb
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#
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# XUO/K7vbsp69yi/rDDoHvQ3sqxJUuiF1Wuyj+hRK1JXRhLkRL+tBE7urlqqoJ1wH
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# IlZ69UELcYghcfIDRrRLXDSdfs98voRxIRDHy0rz64hUHlLBOnfqw/dcHvZBAB09
# CV7QPcDOR87jY228DT4EzA==
# =D7pq
# -----END PGP SIGNATURE-----
# gpg: Signature made Tue 21 Mar 2023 13:20:04 GMT
# gpg: using RSA key E1A5C593CD419DE28E8315CF3C2525ED14360CDE
# gpg: issuer "peter.maydell@linaro.org"
# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>" [ultimate]
# gpg: aka "Peter Maydell <pmaydell@gmail.com>" [ultimate]
# gpg: aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>" [ultimate]
# gpg: aka "Peter Maydell <peter@archaic.org.uk>" [ultimate]
# Primary key fingerprint: E1A5 C593 CD41 9DE2 8E83 15CF 3C25 25ED 1436 0CDE
* tag 'pull-target-arm-20230321' of https://git.linaro.org/people/pmaydell/qemu-arm:
target/arm: Don't advertise aarch64-pauth.xml to gdb
docs/system/arm/cpu-features.rst: Fix formatting
hw/usb/imx: Fix out of bounds access in imx_usbphy_read()
contrib/elf2dmp: add PE name check and Windows Server 2022 support
contrib/elf2dmp: move PE dir search to pe_get_data_dir_entry
contrib/elf2dmp: fix code style
hw/char/cadence_uart: Fix guards on invalid BRGR/BDIV settings
target/arm: Add Neoverse-N1 registers
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'docs')
-rw-r--r-- | docs/system/arm/cpu-features.rst | 76 |
1 files changed, 34 insertions, 42 deletions
diff --git a/docs/system/arm/cpu-features.rst b/docs/system/arm/cpu-features.rst index 00c4440..f4524b6 100644 --- a/docs/system/arm/cpu-features.rst +++ b/docs/system/arm/cpu-features.rst @@ -177,39 +177,32 @@ are named with the prefix "kvm-". KVM VCPU features may be probed, enabled, and disabled in the same way as other CPU features. Below is the list of KVM VCPU features and their descriptions. - kvm-no-adjvtime By default kvm-no-adjvtime is disabled. This - means that by default the virtual time - adjustment is enabled (vtime is not *not* - adjusted). - - When virtual time adjustment is enabled each - time the VM transitions back to running state - the VCPU's virtual counter is updated to ensure - stopped time is not counted. This avoids time - jumps surprising guest OSes and applications, - as long as they use the virtual counter for - timekeeping. However it has the side effect of - the virtual and physical counters diverging. - All timekeeping based on the virtual counter - will appear to lag behind any timekeeping that - does not subtract VM stopped time. The guest - may resynchronize its virtual counter with - other time sources as needed. - - Enable kvm-no-adjvtime to disable virtual time - adjustment, also restoring the legacy (pre-5.0) - behavior. - - kvm-steal-time Since v5.2, kvm-steal-time is enabled by - default when KVM is enabled, the feature is - supported, and the guest is 64-bit. - - When kvm-steal-time is enabled a 64-bit guest - can account for time its CPUs were not running - due to the host not scheduling the corresponding - VCPU threads. The accounting statistics may - influence the guest scheduler behavior and/or be - exposed to the guest userspace. +``kvm-no-adjvtime`` + By default kvm-no-adjvtime is disabled. This means that by default + the virtual time adjustment is enabled (vtime is not *not* adjusted). + + When virtual time adjustment is enabled each time the VM transitions + back to running state the VCPU's virtual counter is updated to + ensure stopped time is not counted. This avoids time jumps + surprising guest OSes and applications, as long as they use the + virtual counter for timekeeping. However it has the side effect of + the virtual and physical counters diverging. All timekeeping based + on the virtual counter will appear to lag behind any timekeeping + that does not subtract VM stopped time. The guest may resynchronize + its virtual counter with other time sources as needed. + + Enable kvm-no-adjvtime to disable virtual time adjustment, also + restoring the legacy (pre-5.0) behavior. + +``kvm-steal-time`` + Since v5.2, kvm-steal-time is enabled by default when KVM is + enabled, the feature is supported, and the guest is 64-bit. + + When kvm-steal-time is enabled a 64-bit guest can account for time + its CPUs were not running due to the host not scheduling the + corresponding VCPU threads. The accounting statistics may influence + the guest scheduler behavior and/or be exposed to the guest + userspace. TCG VCPU Features ================= @@ -217,16 +210,15 @@ TCG VCPU Features TCG VCPU features are CPU features that are specific to TCG. Below is the list of TCG VCPU features and their descriptions. - pauth-impdef When ``FEAT_Pauth`` is enabled, either the - *impdef* (Implementation Defined) algorithm - is enabled or the *architected* QARMA algorithm - is enabled. By default the impdef algorithm - is disabled, and QARMA is enabled. +``pauth-impdef`` + When ``FEAT_Pauth`` is enabled, either the *impdef* (Implementation + Defined) algorithm is enabled or the *architected* QARMA algorithm + is enabled. By default the impdef algorithm is disabled, and QARMA + is enabled. - The architected QARMA algorithm has good - cryptographic properties, but can be quite slow - to emulate. The impdef algorithm used by QEMU - is non-cryptographic but significantly faster. + The architected QARMA algorithm has good cryptographic properties, + but can be quite slow to emulate. The impdef algorithm used by QEMU + is non-cryptographic but significantly faster. SVE CPU Properties ================== |