This patchset primarily adds guest Floating Point Unit (FPU) and MIPS SIMD Architecture (MSA) support to MIPS KVM, by enabling the host FPU/MSA while in guest mode. This patchset depends on Paul Burton's FP/MSA fixes patchset, which will make it into 4.0. I've only included the 3 patches (15, 19, 20) that have changed since v1, which can be found here: http://thread.gmane.org/gmane.linux.kernel.api/8984 The corresponding QEMU patchset can be found here: http://thread.gmane.org/gmane.comp.emulators.kvm.devel/134314 Assuming there are no further review comments I'll submit a pull request once Ralf has applied the FP/MSA fixes for me to merge. Changes in v2: - Add missing MSA vector and control register id bit patterns to API documentation. - Rebased on KVM queue (KVM_CAP_MIPS_FPU & KVM_CAP_MIPS_MSA increased to 108 & 109 after KVM_CAP_S390_VECTOR_REGISTERS took 107). - Just call kvm_vm_ioctl_check_extension() from kvm_vcpu_ioctl_enable_cap() rather than duplicating the extension presence conditions (Paolo). Original description: - Adds KVM_CAP_MIPS_FPU and KVM_CAP_MIPS_MSA capabilities which must be enabled to add FPU/MSA to the guest. - Supports FR=0, FR=1, FRE=1 floating point register modes and 128-bit vector registers. - Does not support UFR/UFE (guest user control of FR/FRE bits), or MSA vector partitioning. - Context restore is lazy: done on first actual use. - Context save is lazy: once restored, host FPU/MSA gets enabled/disabled when guest enables/disables it, with registers left loaded as long as possible. - So the state that can be loaded at any one time is: - No FPRs/vector state - FR=0 FPRs (change of FR discards FP state) - FR=1 FPRs - Vector state (includes FR=1 FPRs) - Vector state only (when guest CU1=0, FR=0) - FCSR/MSACSR status registers are saved/restored around guest execution, since care must be taken to handle FP exceptions when writing these registers. The patches are arranged roughly in groups: - Patch 1 is a related minimal stable fix which can be applied in advance of the others (patch 18 fills it out a bit). - Patch 2 is a generic MIPS change required to be able to restore FCSR/MSACSR registers with exceptions pending. - Patches 3..10 add various misc KVM improvements and cleanups, most of which the later patches depend on. - Patches 11..15 add the main guest FPU support. - Patches 16..20 add the main guest MSA support (structured like 11.15). James Hogan (20): MIPS: KVM: Handle MSA Disabled exceptions from guest MIPS: Clear [MSA]FPE CSR.Cause after notify_die() MIPS: KVM: Handle TRAP exceptions from guest kernel MIPS: KVM: Implement PRid CP0 register access MIPS: KVM: Sort kvm_mips_get_reg() registers MIPS: KVM: Drop pr_info messages on init/exit MIPS: KVM: Clean up register definitions a little MIPS: KVM: Simplify default guest Config registers MIPS: KVM: Add Config4/5 and writing of Config registers MIPS: KVM: Add vcpu_get_regs/vcpu_set_regs callback MIPS: KVM: Add base guest FPU support MIPS: KVM: Emulate FPU bits in COP0 interface MIPS: KVM: Add FP exception handling MIPS: KVM: Expose FPU registers MIPS: KVM: Wire up FPU capability MIPS: KVM: Add base guest MSA support MIPS: KVM: Emulate MSA bits in COP0 interface MIPS: KVM: Add MSA exception handling MIPS: KVM: Expose MSA registers MIPS: KVM: Wire up MSA capability Documentation/virtual/kvm/api.txt | 54 +++++ arch/mips/include/asm/kdebug.h | 3 +- arch/mips/include/asm/kvm_host.h | 125 +++++++--- arch/mips/include/uapi/asm/kvm.h | 160 ++++++++----- arch/mips/kernel/asm-offsets.c | 39 ++++ arch/mips/kernel/genex.S | 14 +- arch/mips/kernel/traps.c | 16 +- arch/mips/kvm/Makefile | 8 +- arch/mips/kvm/emulate.c | 332 ++++++++++++++++++++++++++- arch/mips/kvm/fpu.S | 122 ++++++++++ arch/mips/kvm/locore.S | 38 +++ arch/mips/kvm/mips.c | 472 +++++++++++++++++++++++++++++++++++++- arch/mips/kvm/msa.S | 161 +++++++++++++ arch/mips/kvm/stats.c | 4 + arch/mips/kvm/tlb.c | 6 + arch/mips/kvm/trap_emul.c | 199 +++++++++++++++- include/uapi/linux/kvm.h | 2 + 17 files changed, 1631 insertions(+), 124 deletions(-) create mode 100644 arch/mips/kvm/fpu.S create mode 100644 arch/mips/kvm/msa.S Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> Cc: Paul Burton <paul.burton@xxxxxxxxxx> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Cc: Gleb Natapov <gleb@xxxxxxxxxx> Cc: Jonathan Corbet <corbet@xxxxxxx> Cc: linux-mips@xxxxxxxxxxxxxx Cc: kvm@xxxxxxxxxxxxxxx Cc: linux-api@xxxxxxxxxxxxxxx Cc: linux-doc@xxxxxxxxxxxxxxx -- 2.0.5
