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Message-ID: <20120314002255.GC15362@amt.cnet> Date: Tue, 13 Mar 2012 21:22:55 -0300 From: Marcelo Tosatti <mtosatti@...hat.com> To: Eric B Munson <emunson@...bm.net> Cc: avi@...hat.com, mingo@...hat.com, hpa@...or.com, ryanh@...ux.vnet.ibm.com, aliguori@...ibm.com, kvm@...r.kernel.org, linux-arch@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/4 V16] Avoid soft lockup message when KVM is stopped by host Applied, thanks. On Sat, Mar 10, 2012 at 02:37:24PM -0500, Eric B Munson wrote: > Changes from V15: > Add arch/*/include/asm/kvm_para.h that includes the asm-generic version > > Changes from V14: > Update documentation for the pvclock api > > Changes from V13: > Expand on KVM_KVMCLOCK_CTRL ioctl documentation > > Changes from V12: > Re-add missing kvm.c code after rebase > Rename CAP to KVM_CAP_KVMCLOCK_CTRL > Rename ioctl to KVM_KVMCLOCK_CTRL > > Changes from V11: > Re-add asm-generic stub > Correct api.txt typo > add kvm_make_request() call after setting PVCLOCK_GUEST_STOPPED > > Changes from V10: > Return ioctl to per vcpu instead of per vm > > Changes from V9: > Use kvm_for_each_vcpu to iterate online vcpu's > > Changes from V8: > Make KVM_GUEST_PAUSED a per vm ioctl instead of per vcpu > > Changes from V7: > Define KVM_CAP_GUEST_PAUSED and support check > Call mark_page_dirty () after setting PVCLOCK_GUEST_STOPPED > > Changes from V6: > Use __this_cpu_and when clearing the PVCLOCK_GUEST_STOPPED flag > > Changes from V5: > Collapse generic check_and_clear_guest_stopped into patch 2 > Include check_and_clear_guest_stopped defintion to ia64, s390, and powerpc > Change check_and_clear_guest_stopped to use __get_cpu_var instead of taking the > cpuid arg. > Protect check_and_clear_guest_stopped declaration with CONFIG_KVM_CLOCK check > > Changes from V4: > Rename KVM_GUEST_PAUSED to KVMCLOCK_GUEST_PAUSED > Add description of KVMCLOCK_GUEST_PAUSED ioctl to api.txt > > Changes from V3: > Include CC's on patch 3 > Drop clear flag ioctl and have the watchdog clear the flag when it is reset > > Changes from V2: > A new kvm functions defined in kvm_para.h, the only change to pvclock is the > initial flag definition > > Changes from V1: > (Thanks Marcelo) > Host code has all been moved to arch/x86/kvm/x86.c > KVM_PAUSE_GUEST was renamed to KVM_GUEST_PAUSED > > When a guest kernel is stopped by the host hypervisor it can look like a soft > lockup to the guest kernel. This false warning can mask later soft lockup > warnings which may be real. This patch series adds a method for a host > hypervisor to communicate to a guest kernel that it is being stopped. The > final patch in the series has the watchdog check this flag when it goes to > issue a soft lockup warning and skip the warning if the guest knows it was > stopped. > > It was attempted to solve this in Qemu, but the side effects of saving and > restoring the clock and tsc for each vcpu put the wall clock of the guest behind > by the amount of time of the pause. This forces a guest to have ntp running > in order to keep the wall clock accurate. > > Cc: mingo@...hat.com > Cc: hpa@...or.com > Cc: ryanh@...ux.vnet.ibm.com > Cc: aliguori@...ibm.com > Cc: mtosatti@...hat.com > Cc: kvm@...r.kernel.org > Cc: linux-arch@...r.kernel.org > Cc: x86@...nel.org > Cc: linux-kernel@...r.kernel.org > > Eric B Munson (4): > Add flag to indicate that a vm was stopped by the host > Add functions to check if the host has stopped the vm > Add ioctl for KVM_KVMCLOCK_CTRL > Add check for suspended vm in softlockup detector > > Documentation/virtual/kvm/api.txt | 20 ++++++++++++++++++++ > Documentation/virtual/kvm/msr.txt | 4 ++++ > arch/alpha/include/asm/kvm_para.h | 1 + > arch/arm/include/asm/kvm_para.h | 1 + > arch/avr32/include/asm/kvm_para.h | 1 + > arch/blackfin/include/asm/kvm_para.h | 1 + > arch/c6x/include/asm/kvm_para.h | 1 + > arch/frv/include/asm/kvm_para.h | 1 + > arch/h8300/include/asm/kvm_para.h | 1 + > arch/hexagon/include/asm/kvm_para.h | 1 + > arch/ia64/include/asm/kvm_para.h | 5 +++++ > arch/m68k/include/asm/kvm_para.h | 1 + > arch/microblaze/include/asm/kvm_para.h | 1 + > arch/mips/include/asm/kvm_para.h | 1 + > arch/mn10300/include/asm/kvm_para.h | 1 + > arch/openrisc/include/asm/kvm_para.h | 1 + > arch/parisc/include/asm/kvm_para.h | 1 + > arch/powerpc/include/asm/kvm_para.h | 5 +++++ > arch/s390/include/asm/kvm_para.h | 5 +++++ > arch/score/include/asm/kvm_para.h | 1 + > arch/sh/include/asm/kvm_para.h | 1 + > arch/sparc/include/asm/kvm_para.h | 1 + > arch/tile/include/asm/kvm_para.h | 1 + > arch/um/include/asm/kvm_para.h | 1 + > arch/unicore32/include/asm/kvm_para.h | 1 + > arch/x86/include/asm/kvm_para.h | 8 ++++++++ > arch/x86/include/asm/pvclock-abi.h | 1 + > arch/x86/kernel/kvmclock.c | 21 +++++++++++++++++++++ > arch/x86/kvm/x86.c | 22 ++++++++++++++++++++++ > arch/xtensa/include/asm/kvm_para.h | 1 + > include/asm-generic/kvm_para.h | 14 ++++++++++++++ > include/linux/kvm.h | 3 +++ > kernel/watchdog.c | 12 ++++++++++++ > 33 files changed, 141 insertions(+), 0 deletions(-) > create mode 100644 arch/alpha/include/asm/kvm_para.h > create mode 100644 arch/arm/include/asm/kvm_para.h > create mode 100644 arch/avr32/include/asm/kvm_para.h > create mode 100644 arch/blackfin/include/asm/kvm_para.h > create mode 100644 arch/c6x/include/asm/kvm_para.h > create mode 100644 arch/frv/include/asm/kvm_para.h > create mode 100644 arch/h8300/include/asm/kvm_para.h > create mode 100644 arch/hexagon/include/asm/kvm_para.h > create mode 100644 arch/m68k/include/asm/kvm_para.h > create mode 100644 arch/microblaze/include/asm/kvm_para.h > create mode 100644 arch/mips/include/asm/kvm_para.h > create mode 100644 arch/mn10300/include/asm/kvm_para.h > create mode 100644 arch/openrisc/include/asm/kvm_para.h > create mode 100644 arch/parisc/include/asm/kvm_para.h > create mode 100644 arch/score/include/asm/kvm_para.h > create mode 100644 arch/sh/include/asm/kvm_para.h > create mode 100644 arch/sparc/include/asm/kvm_para.h > create mode 100644 arch/tile/include/asm/kvm_para.h > create mode 100644 arch/um/include/asm/kvm_para.h > create mode 100644 arch/unicore32/include/asm/kvm_para.h > create mode 100644 arch/xtensa/include/asm/kvm_para.h > create mode 100644 include/asm-generic/kvm_para.h > > -- > 1.7.5.4 > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- 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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