These patches change the MIPS KVM exception entry code to be dynamically
assembled by the MIPS "uasm" in-kernel assembler, directly into unmapped
memory at run time by a new entry.c. Previously this code was statically
assembled from locore.S at build time and later copied into unmapped
memory at run time.
Patches 1-5 add support for the necessary instructions to uasm.
Patches 6-8 do the minimal-change conversion of locore.S to entry.c
using uasm (I've used -M10% so the diff is shown as a file move).
Patches 9-14 make some related improvements that are possible now that
it is dynamically generated, such as avoiding messy runtime conditionals
in assembly code, making use of KScratch registers when available, and
simplifying the initial GP register save sequence & jump to common code.
Ralf: Since the uasm patches (1-5) are needed for the later patches, I
suggest these all go together via the KVM tree (on which the whole
patchset is based), so Acks are welcome if they're okay with you.
James Hogan (14):
MIPS: uasm: Add CFC1/CTC1 instructions
MIPS: uasm: Add CFCMSA/CTCMSA instructions
MIPS: uasm: Add DI instruction
MIPS: uasm: Add MTHI/MTLO instructions
MIPS: uasm: Add r6 MUL encoding
MIPS; KVM: Convert exception entry to uasm
MIPS: KVM: Add dumping of generated entry code
MIPS: KVM: Drop now unused asm offsets
MIPS: KVM: Omit FPU handling entry code if possible
MIPS: KVM: Check MSA presence at uasm time
MIPS: KVM: Drop redundant restore of DDATA_LO
MIPS: KVM: Dynamically choose scratch registers
MIPS: KVM: Relative branch to common exit handler
MIPS: KVM: Save k0 straight into VCPU structure
arch/mips/include/asm/kvm_host.h | 9 +-
arch/mips/include/asm/uasm.h | 7 +
arch/mips/include/uapi/asm/inst.h | 71 ++-
arch/mips/kernel/asm-offsets.c | 66 ---
arch/mips/kvm/Kconfig | 1 +
arch/mips/kvm/Makefile | 2 +-
arch/mips/kvm/{locore.S => entry.c} | 976 +++++++++++++++++++-----------------
arch/mips/kvm/interrupt.h | 4 -
arch/mips/kvm/mips.c | 66 ++-
arch/mips/mm/uasm-micromips.c | 13 +-
arch/mips/mm/uasm-mips.c | 11 +
arch/mips/mm/uasm.c | 24 +-
12 files changed, 695 insertions(+), 555 deletions(-)
rename arch/mips/kvm/{locore.S => entry.c} (15%)
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
--
2.4.10
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