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OpenCloudOS-Kernel/arch/mips/kvm/Kconfig

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KVM/MIPS32: Infrastructure/build files. - Add the KVM option to MIPS build files. - Add default config files for KVM host/guest kernels. - Change the link address for the Malta KVM Guest kernel to UM (0x40100000). - Add KVM Kconfig file with KVM/MIPS specific options Signed-off-by: Sanjay Lal <sanjayl@kymasys.com> Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2012-11-22 10:33:59 +08:00
#
# KVM configuration
#
source "virt/kvm/Kconfig"
menuconfig VIRTUALIZATION
bool "Virtualization"
---help---
Say Y here to get to see options for using your Linux host to run
other operating systems inside virtual machines (guests).
This option alone does not add any kernel code.
If you say N, all options in this submenu will be skipped and disabled.
if VIRTUALIZATION
config KVM
tristate "Kernel-based Virtual Machine (KVM) support"
depends on HAVE_KVM
MIPS; KVM: Convert exception entry to uasm Convert the whole of locore.S (assembly to enter guest and handle exception entry) to be generated dynamically with uasm. This is done with minimal changes to the resulting code. The main changes are: - Some constants are generated by uasm using LUI+ADDIU instead of LUI+ORI. - Loading of lo and hi are swapped around in vcpu_run but not when resuming the guest after an exit. Both bits of logic are now generated by the same code. - Register MOVEs in uasm use different ADDU operand ordering to GNU as, putting zero register into rs instead of rt. - The JALR.HB to call the C exit handler is switched to JALR, since the hazard barrier would appear to be unnecessary. This will allow further optimisation in the future to dynamically handle the capabilities of the CPU. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim KrÄmář <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-06-24 00:34:39 +08:00
select EXPORT_UASM
KVM/MIPS32: Infrastructure/build files. - Add the KVM option to MIPS build files. - Add default config files for KVM host/guest kernels. - Change the link address for the Malta KVM Guest kernel to UM (0x40100000). - Add KVM Kconfig file with KVM/MIPS specific options Signed-off-by: Sanjay Lal <sanjayl@kymasys.com> Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2012-11-22 10:33:59 +08:00
select PREEMPT_NOTIFIERS
select ANON_INODES
KVM: MIPS/MMU: Use generic dirty log & protect helper MIPS hasn't up to this point properly supported dirty page logging, as pages in slots with dirty logging enabled aren't made clean, and tlbmod exceptions from writes to clean pages have been assumed to be due to guest TLB protection and unconditionally passed to the guest. Use the generic dirty logging helper kvm_get_dirty_log_protect() to properly implement kvm_vm_ioctl_get_dirty_log(), similar to how ARM does. This uses xchg to clear the dirty bits when reading them, rather than wiping them out afterwards with a memset, which would potentially wipe recently set bits that weren't caught by kvm_get_dirty_log(). It also makes the pages clean again using the kvm_arch_mmu_enable_log_dirty_pt_masked() architecture callback so that further writes after the shadow memslot is flushed will trigger tlbmod exceptions and dirty handling. 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
2016-12-06 22:50:52 +08:00
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
KVM/MIPS32: Infrastructure/build files. - Add the KVM option to MIPS build files. - Add default config files for KVM host/guest kernels. - Change the link address for the Malta KVM Guest kernel to UM (0x40100000). - Add KVM Kconfig file with KVM/MIPS specific options Signed-off-by: Sanjay Lal <sanjayl@kymasys.com> Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2012-11-22 10:33:59 +08:00
select KVM_MMIO
rcu: Make SRCU optional by using CONFIG_SRCU SRCU is not necessary to be compiled by default in all cases. For tinification efforts not compiling SRCU unless necessary is desirable. The current patch tries to make compiling SRCU optional by introducing a new Kconfig option CONFIG_SRCU which is selected when any of the components making use of SRCU are selected. If we do not select CONFIG_SRCU, srcu.o will not be compiled at all. text data bss dec hex filename 2007 0 0 2007 7d7 kernel/rcu/srcu.o Size of arch/powerpc/boot/zImage changes from text data bss dec hex filename 831552 64180 23944 919676 e087c arch/powerpc/boot/zImage : before 829504 64180 23952 917636 e0084 arch/powerpc/boot/zImage : after so the savings are about ~2000 bytes. Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com> CC: Josh Triplett <josh@joshtriplett.org> CC: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> [ paulmck: resolve conflict due to removal of arch/ia64/kvm/Kconfig. ]
2014-12-06 00:24:45 +08:00
select SRCU
KVM/MIPS32: Infrastructure/build files. - Add the KVM option to MIPS build files. - Add default config files for KVM host/guest kernels. - Change the link address for the Malta KVM Guest kernel to UM (0x40100000). - Add KVM Kconfig file with KVM/MIPS specific options Signed-off-by: Sanjay Lal <sanjayl@kymasys.com> Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2012-11-22 10:33:59 +08:00
---help---
Support for hosting Guest kernels.
Currently supported on MIPS32 processors.
config KVM_MIPS_DYN_TRANS
bool "KVM/MIPS: Dynamic binary translation to reduce traps"
depends on KVM
---help---
When running in Trap & Emulate mode patch privileged
instructions to reduce the number of traps.
If unsure, say Y.
config KVM_MIPS_DEBUG_COP0_COUNTERS
bool "Maintain counters for COP0 accesses"
depends on KVM
---help---
Maintain statistics for Guest COP0 accesses.
A histogram of COP0 accesses is printed when the VM is
shutdown.
If unsure, say N.
source drivers/vhost/Kconfig
endif # VIRTUALIZATION