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Date: Tue, 14 Jan 2014 09:01:50 +0100 From: Paolo Bonzini <pbonzini@...hat.com> To: Dave Hansen <dave@...1.net> CC: linux-kernel@...r.kernel.org, x86@...nel.org, bp@...e.de, dtor@...are.com, kys@...rosoft.com, haiyangz@...rosoft.com, agraf@...e.de, gleb@...hat.com Subject: Re: [PATCH 2/2] x86 Kconfig: move guest-side options under "Virtualization" Il 14/01/2014 01:11, Dave Hansen ha scritto: > We now have two groups of options in "Virtualization": one for > host-side support and a matching one for guest-side stuff. We do > not need separate submenus for this stuff since there are so few > options. > > Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com> > Cc: Borislav Petkov <bp@...e.de> > Cc: Dmitry Torokhov <dtor@...are.com> > Cc: K. Y. Srinivasan <kys@...rosoft.com> > Cc: Haiyang Zhang <haiyangz@...rosoft.com> > Cc: Alexander Graf <agraf@...e.de> > Cc: Gleb Natapov <gleb@...hat.com> > Cc: Paolo Bonzini <pbonzini@...hat.com> > --- > > linux.git-davehans/arch/x86/Kconfig | 83 ---------------------------- > linux.git-davehans/arch/x86/Kconfig.virt | 85 +++++++++++++++++++++++++++++ > linux.git-davehans/arch/x86/kvm/Kconfig | 2 > linux.git-davehans/arch/x86/lguest/Kconfig | 1 > 4 files changed, 85 insertions(+), 86 deletions(-) > > diff -puN arch/x86/Kconfig~x86-Kconfig-move-paravirt-under-virtualization-really arch/x86/Kconfig > --- linux.git/arch/x86/Kconfig~x86-Kconfig-move-paravirt-under-virtualization-really 2014-01-13 16:10:05.721497873 -0800 > +++ linux.git-davehans/arch/x86/Kconfig 2014-01-13 16:10:05.758499543 -0800 > @@ -1018,89 +1018,6 @@ config X86_ES7000 > Support for Unisys ES7000 systems. Say 'Y' here if this kernel is > supposed to run on an IA32-based Unisys ES7000 system. > > -menuconfig HYPERVISOR_GUEST > - bool "Linux guest support" > - ---help--- > - Say Y here to enable options for running Linux under various hyper- > - visors. This option enables basic hypervisor detection and platform > - setup. > - > - If you say N, all options in this submenu will be skipped and > - disabled, and Linux guest support won't be built in. > - > -if HYPERVISOR_GUEST > - > -config PARAVIRT > - bool "Enable paravirtualization code" > - ---help--- > - This changes the kernel so it can modify itself when it is run > - under a hypervisor, potentially improving performance significantly > - over full virtualization. However, when run without a hypervisor > - the kernel is theoretically slower and slightly larger. > - > -config PARAVIRT_DEBUG > - bool "paravirt-ops debugging" > - depends on PARAVIRT && DEBUG_KERNEL > - ---help--- > - Enable to debug paravirt_ops internals. Specifically, BUG if > - a paravirt_op is missing when it is called. > - > -config PARAVIRT_SPINLOCKS > - bool "Paravirtualization layer for spinlocks" > - depends on PARAVIRT && SMP > - select UNINLINE_SPIN_UNLOCK > - ---help--- > - Paravirtualized spinlocks allow a pvops backend to replace the > - spinlock implementation with something virtualization-friendly > - (for example, block the virtual CPU rather than spinning). > - > - It has a minimal impact on native kernels and gives a nice performance > - benefit on paravirtualized KVM / Xen kernels. > - > - If you are unsure how to answer this question, answer Y. > - > -source "arch/x86/xen/Kconfig" > - > -config KVM_GUEST > - bool "KVM Guest support (including kvmclock)" > - depends on PARAVIRT > - select PARAVIRT_CLOCK > - default y > - ---help--- > - This option enables various optimizations for running under the KVM > - hypervisor. It includes a paravirtualized clock, so that instead > - of relying on a PIT (or probably other) emulation by the > - underlying device model, the host provides the guest with > - timing infrastructure such as time of day, and system time > - > -config KVM_DEBUG_FS > - bool "Enable debug information for KVM Guests in debugfs" > - depends on KVM_GUEST && DEBUG_FS > - default n > - ---help--- > - This option enables collection of various statistics for KVM guest. > - Statistics are displayed in debugfs filesystem. Enabling this option > - may incur significant overhead. > - > -source "arch/x86/lguest/Kconfig" > - > -config PARAVIRT_TIME_ACCOUNTING > - bool "Paravirtual steal time accounting" > - depends on PARAVIRT > - default n > - ---help--- > - Select this option to enable fine granularity task steal time > - accounting. Time spent executing other tasks in parallel with > - the current vCPU is discounted from the vCPU power. To account for > - that, there can be a small performance impact. > - > - If in doubt, say N here. > - > -config PARAVIRT_CLOCK > - bool > - > -endif #HYPERVISOR_GUEST > - > config NO_BOOTMEM > def_bool y > > diff -puN arch/x86/Kconfig.virt~x86-Kconfig-move-paravirt-under-virtualization-really arch/x86/Kconfig.virt > --- linux.git/arch/x86/Kconfig.virt~x86-Kconfig-move-paravirt-under-virtualization-really 2014-01-13 16:10:05.722497918 -0800 > +++ linux.git-davehans/arch/x86/Kconfig.virt 2014-01-13 16:10:35.730852434 -0800 > @@ -1,3 +1,5 @@ > +# No menu items in here, just common config variables: > +source "virt/kvm/Kconfig" > > menu "Virtualization" > > @@ -22,4 +24,87 @@ source drivers/lguest/Kconfig > > endif # HYPERVISOR_HOST > > +config HYPERVISOR_GUEST > + bool "Guest-Side Features (Linux running under a Hypervisor)" > + ---help--- > + Say Y here to enable options for running Linux under various hyper- > + visors. This option enables basic hypervisor detection and platform > + setup. > + > + If you say N, all options in this submenu will be skipped and > + disabled, and Linux guest support won't be built in. > + > +if HYPERVISOR_GUEST > + > +config PARAVIRT > + bool "Enable paravirtualization code" > + ---help--- > + This changes the kernel so it can modify itself when it is run > + under a hypervisor, potentially improving performance significantly > + over full virtualization. However, when run without a hypervisor > + the kernel is theoretically slower and slightly larger. > + > +config PARAVIRT_DEBUG > + bool "paravirt-ops debugging" > + depends on PARAVIRT && DEBUG_KERNEL > + ---help--- > + Enable to debug paravirt_ops internals. Specifically, BUG if > + a paravirt_op is missing when it is called. > + > +config PARAVIRT_SPINLOCKS > + bool "Paravirtualization layer for spinlocks" > + depends on PARAVIRT && SMP > + select UNINLINE_SPIN_UNLOCK > + ---help--- > + Paravirtualized spinlocks allow a pvops backend to replace the > + spinlock implementation with something virtualization-friendly > + (for example, block the virtual CPU rather than spinning). > + > + It has a minimal impact on native kernels and gives a nice performance > + benefit on paravirtualized KVM / Xen kernels. > + > + If you are unsure how to answer this question, answer Y. > + > +source "arch/x86/xen/Kconfig" > + > +config KVM_GUEST > + bool "KVM Guest support (including kvmclock)" > + depends on PARAVIRT > + select PARAVIRT_CLOCK > + default y > + ---help--- > + This option enables various optimizations for running under the KVM > + hypervisor. It includes a paravirtualized clock, so that instead > + of relying on a PIT (or probably other) emulation by the > + underlying device model, the host provides the guest with > + timing infrastructure such as time of day, and system time > + > +config KVM_DEBUG_FS > + bool "Enable debug information for KVM Guests in debugfs" > + depends on KVM_GUEST && DEBUG_FS > + default n > + ---help--- > + This option enables collection of various statistics for KVM guest. > + Statistics are displayed in debugfs filesystem. Enabling this option > + may incur significant overhead. > + > +source "arch/x86/lguest/Kconfig" > + > +config PARAVIRT_TIME_ACCOUNTING > + bool "Paravirtual steal time accounting" > + depends on PARAVIRT > + default n > + ---help--- > + Select this option to enable fine granularity task steal time > + accounting. Time spent executing other tasks in parallel with > + the current vCPU is discounted from the vCPU power. To account for > + that, there can be a small performance impact. > + > + If in doubt, say N here. > + > +config PARAVIRT_CLOCK > + bool > + > +endif # HYPERVISOR_GUEST > + > endmenu # "Virtualization" > diff -puN arch/x86/lguest/Kconfig~x86-Kconfig-move-paravirt-under-virtualization-really arch/x86/lguest/Kconfig > --- linux.git/arch/x86/lguest/Kconfig~x86-Kconfig-move-paravirt-under-virtualization-really 2014-01-13 16:10:05.724498009 -0800 > +++ linux.git-davehans/arch/x86/lguest/Kconfig 2014-01-13 16:10:05.759499589 -0800 > @@ -2,7 +2,6 @@ config LGUEST_GUEST > bool "Lguest guest support" > depends on X86_32 && PARAVIRT > select TTY > - select VIRTUALIZATION > select VIRTIO > select VIRTIO_CONSOLE > help > diff -puN arch/x86/kvm/Kconfig~x86-Kconfig-move-paravirt-under-virtualization-really arch/x86/kvm/Kconfig > --- linux.git/arch/x86/kvm/Kconfig~x86-Kconfig-move-paravirt-under-virtualization-really 2014-01-13 16:10:05.729498234 -0800 > +++ linux.git-davehans/arch/x86/kvm/Kconfig 2014-01-13 16:10:05.760499634 -0800 > @@ -2,8 +2,6 @@ > # KVM configuration > # > > -source "virt/kvm/Kconfig" > - > config KVM > tristate "Kernel-based Virtual Machine (KVM) support" > depends on HAVE_KVM > _ > Acked-by: Paolo Bonzini <pbonzini@...hat.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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