A-profile CPU architecture support¶
QEMU’s TCG emulation includes support for the Armv5, Armv6, Armv7 and Armv8 versions of the A-profile architecture. It also has support for the following architecture extensions:
- FEAT_AA32BF16 (AArch32 BFloat16 instructions) 
- FEAT_AA32HPD (AArch32 hierarchical permission disables) 
- FEAT_AA32I8MM (AArch32 Int8 matrix multiplication instructions) 
- FEAT_AES (AESD and AESE instructions) 
- FEAT_BF16 (AArch64 BFloat16 instructions) 
- FEAT_BTI (Branch Target Identification) 
- FEAT_DIT (Data Independent Timing instructions) 
- FEAT_DPB (DC CVAP instruction) 
- FEAT_DotProd (Advanced SIMD dot product instructions) 
- FEAT_FCMA (Floating-point complex number instructions) 
- FEAT_FHM (Floating-point half-precision multiplication instructions) 
- FEAT_FP16 (Half-precision floating-point data processing) 
- FEAT_FRINTTS (Floating-point to integer instructions) 
- FEAT_FlagM (Flag manipulation instructions v2) 
- FEAT_FlagM2 (Enhancements to flag manipulation instructions) 
- FEAT_HPDS (Hierarchical permission disables) 
- FEAT_I8MM (AArch64 Int8 matrix multiplication instructions) 
- FEAT_JSCVT (JavaScript conversion instructions) 
- FEAT_LOR (Limited ordering regions) 
- FEAT_LRCPC (Load-acquire RCpc instructions) 
- FEAT_LRCPC2 (Load-acquire RCpc instructions v2) 
- FEAT_LSE (Large System Extensions) 
- FEAT_MTE (Memory Tagging Extension) 
- FEAT_MTE2 (Memory Tagging Extension) 
- FEAT_MTE3 (MTE Asymmetric Fault Handling) 
- FEAT_PAN (Privileged access never) 
- FEAT_PAN2 (AT S1E1R and AT S1E1W instruction variants affected by PSTATE.PAN) 
- FEAT_PAuth (Pointer authentication) 
- FEAT_PMULL (PMULL, PMULL2 instructions) 
- FEAT_PMUv3p1 (PMU Extensions v3.1) 
- FEAT_PMUv3p4 (PMU Extensions v3.4) 
- FEAT_RDM (Advanced SIMD rounding double multiply accumulate instructions) 
- FEAT_RNG (Random number generator) 
- FEAT_SB (Speculation Barrier) 
- FEAT_SEL2 (Secure EL2) 
- FEAT_SHA1 (SHA1 instructions) 
- FEAT_SHA256 (SHA256 instructions) 
- FEAT_SHA3 (Advanced SIMD SHA3 instructions) 
- FEAT_SHA512 (Advanced SIMD SHA512 instructions) 
- FEAT_SM3 (Advanced SIMD SM3 instructions) 
- FEAT_SM4 (Advanced SIMD SM4 instructions) 
- FEAT_SPECRES (Speculation restriction instructions) 
- FEAT_SSBS (Speculative Store Bypass Safe) 
- FEAT_TLBIOS (TLB invalidate instructions in Outer Shareable domain) 
- FEAT_TLBIRANGE (TLB invalidate range instructions) 
- FEAT_TTCNP (Translation table Common not private translations) 
- FEAT_TTST (Small translation tables) 
- FEAT_UAO (Unprivileged Access Override control) 
- FEAT_VHE (Virtualization Host Extensions) 
- FEAT_VMID16 (16-bit VMID) 
- FEAT_XNX (Translation table stage 2 Unprivileged Execute-never) 
- SVE (The Scalable Vector Extension) 
- SVE2 (The Scalable Vector Extension v2) 
For information on the specifics of these extensions, please refer to the Armv8-A Arm Architecture Reference Manual.
When a specific named CPU is being emulated, only those features which
are present in hardware for that CPU are emulated. (If a feature is
not in the list above then it is not supported, even if the real
hardware should have it.) The max CPU enables all features.
R-profile CPU architecture support¶
QEMU’s TCG emulation support for R-profile CPUs is currently limited. We emulate only the Cortex-R5 and Cortex-R5F CPUs.
M-profile CPU architecture support¶
QEMU’s TCG emulation includes support for Armv6-M, Armv7-M, Armv8-M, and Armv8.1-M versions of the M-profile architucture. It also has support for the following architecture extensions:
- FP (Floating-point Extension) 
- FPCXT (FPCXT access instructions) 
- HP (Half-precision floating-point instructions) 
- LOB (Low Overhead loops and Branch future) 
- M (Main Extension) 
- MPU (Memory Protection Unit Extension) 
- PXN (Privileged Execute Never) 
- RAS (Reliability, Serviceability and Availability): “minimum RAS Extension” only 
- S (Security Extension) 
- ST (System Timer Extension) 
For information on the specifics of these extensions, please refer to the Armv8-M Arm Architecture Reference Manual.
When a specific named CPU is being emulated, only those features which
are present in hardware for that CPU are emulated. (If a feature is
not in the list above then it is not supported, even if the real
hardware should have it.) There is no equivalent of the max CPU for
M-profile.