linux/arch/mips/kvm
James Hogan a27660f3e4 KVM: MIPS: Abstract guest CP0 register access for VZ
Abstract the MIPS KVM guest CP0 register access macros into inline
functions which are generated by macros. This allows them to be
generated differently for VZ, where they will usually need to access the
hardware guest CP0 context rather than the saved values in RAM.

Accessors for each individual register are generated using these macros:

 - __BUILD_KVM_*_SW() for registers which are not present in the VZ
   hardware guest context, so kvm_{read,write}_c0_guest_##name() will
   access the saved value in RAM regardless of whether VZ is enabled.

 - __BUILD_KVM_*_HW() for registers which are present in the VZ hardware
   guest context, so kvm_{read,write}_c0_guest_##name() will access the
   hardware register when VZ is enabled.

These build the underlying accessors using further macros:

 - __BUILD_KVM_*_SAVED() builds e.g. kvm_{read,write}_sw_gc0_##name()
   functions for accessing the saved versions of the registers in RAM.
   This is used for implementing the common
   kvm_{read,write}_c0_guest_##name() accessors with T&E where registers
   are always stored in RAM, but are also available with VZ HW registers
   to allow them to be accessed while saved.

 - __BUILD_KVM_*_VZ() builds e.g. kvm_{read,write}_vz_gc0_##name()
   functions for accessing the VZ hardware guest context registers
   directly. This is used for implementing the common
   kvm_{read,write}_c0_guest_##name() accessors with VZ.

 - __BUILD_KVM_*_WRAP() builds wrappers with different names, which
   allows the common kvm_{read,write}_c0_guest_##name() functions to be
   implemented using the VZ accessors while still having the SAVED
   accessors available too.

 - __BUILD_KVM_SAVE_VZ() builds functions for saving and restoring VZ
   hardware guest context register state to RAM, improving conciseness
   of VZ context saving and restoring.

Similar macros exist for generating modifiers (set, clear, change),
either with a normal unlocked read/modify/write, or using atomic LL/SC
sequences.

These changes change the types of 32-bit registers to u32 instead of
unsigned long, which requires some changes to printk() functions in MIPS
KVM.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
2017-03-28 14:53:50 +01:00
..
00README.txt
callback.c MIPS: KVM: Convert EXPORT_SYMBOL to _GPL 2016-01-24 03:13:24 +01:00
commpage.c MIPS: kvm: Audit and remove any unnecessary uses of module.h 2016-10-05 01:31:20 +02:00
commpage.h MIPS: KVM: Rename files to remove the prefix "kvm_" and "kvm_mips_" 2014-06-30 16:52:03 +02:00
dyntrans.c KVM: MIPS/T&E: Use lockless GVA helpers for dyntrans 2017-02-03 15:21:12 +00:00
emulate.c KVM: MIPS: Abstract guest CP0 register access for VZ 2017-03-28 14:53:50 +01:00
entry.c KVM: MIPS: Use CP0_BadInstr[P] for emulation 2017-02-03 15:21:07 +00:00
fpu.S MIPS: KVM: Fix fpu.S misassembly with r6 2016-07-05 16:09:11 +02:00
hypcall.c KVM: MIPS: Implement HYPCALL emulation 2017-03-28 14:53:33 +01:00
interrupt.c KVM: MIPS/T&E: Implement CP0_EBase register 2017-02-03 15:21:30 +00:00
interrupt.h MIPS; KVM: Convert exception entry to uasm 2016-07-05 16:08:46 +02:00
Kconfig KVM: MIPS/MMU: Implement KVM_CAP_SYNC_MMU 2017-02-03 15:21:28 +00:00
Makefile KVM: MIPS: Implement HYPCALL emulation 2017-03-28 14:53:33 +01:00
mips.c KVM: MIPS: Abstract guest CP0 register access for VZ 2017-03-28 14:53:50 +01:00
mmu.c KVM: MIPS/MMU: Implement KVM_CAP_SYNC_MMU 2017-02-03 15:21:28 +00:00
msa.S MIPS: KVM: Add base guest MSA support 2015-03-27 21:25:19 +00:00
stats.c MIPS: KVM: Clean up kvm_exit trace event 2016-06-14 11:16:23 +02:00
tlb.c KVM: MIPS/Emulate: Use lockless GVA helpers for cache emulation 2017-02-03 15:21:15 +00:00
trace.h KVM: MIPS: Add guest exit exception callback 2017-03-28 14:53:49 +01:00
trap_emul.c KVM: MIPS: Abstract guest CP0 register access for VZ 2017-03-28 14:53:50 +01:00