Hi Dave, > -----Original Message----- > From: linux-arm-kernel <linux-arm-kernel-bounces@xxxxxxxxxxxxxxxxxxx> On > Behalf Of Dave Martin > Sent: Tuesday, February 19, 2019 4:52 AM > To: kvmarm@xxxxxxxxxxxxxxxxxxxxx > Cc: Peter Maydell <peter.maydell@xxxxxxxxxx>; Okamoto, Takayuki/?本 高幸 > <tokamoto@xxxxxxxxxxxxxx>; Christoffer Dall <cdall@xxxxxxxxxx>; Ard > Biesheuvel <ard.biesheuvel@xxxxxxxxxx>; Marc Zyngier > <marc.zyngier@xxxxxxx>; Catalin Marinas <catalin.marinas@xxxxxxx>; Will > Deacon <will.deacon@xxxxxxx>; Zhang, Lei/? 雷 > <zhang.lei@xxxxxxxxxxxxxx>; Julien Grall <julien.grall@xxxxxxx>; Alex Bennée > <alex.bennee@xxxxxxxxxx>; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > Subject: [PATCH v5 00/26] KVM: arm64: SVE guest support > > This series implements support for allowing KVM guests to use the Arm > Scalable Vector Extension (SVE), superseding the previous v4 series [1]. > > The patches are also available on a branch for reviewer convenience. [2] > > The patches are based on v5.0-rc6. > > They depend on another small series currently under review [3] that does a bit > of relevant refactoring (as well as fixing an anomaly not directly related to this > series). A base branch [4] is provided so that reviewers don't need to hunt > down both series independently. [>] I tested the patch on A64FX chip which SVE feature had been implemented. All of tests have been passed. Please add follows : Tested-by: zhang.lei <zhang.lei@xxxxxxxxxxxxxx> > > This series contains no major update except for the removal of multiple register > slice support in the user register access ioctls. The ABI is kept as-is so that > this functionality can be added back in later on if/when needed. ioctl access > to nonexistent slices now yields ENOENT, which is more consistent with the > notion of an absent register. > > For a description of minor updates, see the individual patches. > > > Functionality testing and stress-testing has been done, using a hacked-up > kvmtool [5]: > > * Arm Fast Model: full testing of arm64 defconfig, including running > non-SVE and SVE guests with mixtures of vector lengths. limited > testing of other configurations. > > * ThunderX2: basic testing of arm64 defconfig, including booting guests > (no SVE support on this hardware). > > * Full build-bisect testing and sparse testing of every commit done > for arm64 (defconfig, CONFIG_ARM64_SVE=n, CONFIG_KVM=n) and arm > (multi_v7_defconfig, CONFIG_KVM=y). One new sparse warning, > probably spurious (see note in patch 22). > > > AArch32 host testing is pending. I will ping this series with a reply to the cover > letter when that testing has been completed. > > > Known issues: > > * **Possible bug** > > SVE state corruption has been in the host when running on the Arm > Fast Model. > > After some investigation with the model engineers, it appears that > there may be a model bug in this area. I have also obtained detailed > trace of failure cases, which is also suggestive of a model bug. No > clear evidence has been obtained to show that there is a bug in > Linux, so far. > > All available evidence suggests that this bug will not affect non-SVE > hardware: the symptom is unexpected zeroing of bits 128 and above of > the vector registers (which don't exist prior to SVE). > > * kvmtool support is not mature > > > [1] [RFC PATCH v4 00/24] KVM: arm64: SVE guest support > https://lists.cs.columbia.edu/pipermail/kvmarm/2019-January/034134.html > > [2] This series in git: > http://linux-arm.org/git?p=linux-dm.git;a=shortlog;h=refs/heads/sve-kvm/v5 > /head > git://linux-arm.org/linux-dm.git sve-kvm/v5/head > > [3] [PATCH v2 0/2] Fix KVM_GET_REG_LIST invalid register ID regression > https://lists.cs.columbia.edu/pipermail/kvmarm/2018-December/033810.htm > l > > [4] Base of this series in git: > http://linux-arm.org/git?p=linux-dm.git;a=shortlog;h=refs/heads/sve-kvm/v5 > /base > git://linux-arm.org/linux-dm.git sve-kvm/v5/base > > [5] [RFC PATCH 00/12] arm64: SVE guest support test hacks > https://lists.cs.columbia.edu/pipermail/kvmarm/2019-January/034162.html > > > Dave Martin (26): > KVM: Documentation: Document arm64 core registers in detail > arm64: fpsimd: Always set TIF_FOREIGN_FPSTATE on task state flush > KVM: arm64: Delete orphaned declaration for __fpsimd_enabled() > KVM: arm64: Refactor kvm_arm_num_regs() for easier maintenance > KVM: arm64: Add missing #include of <linux/bitmap.h> to kvm_host.h > arm64/sve: Check SVE virtualisability > arm64/sve: Clarify role of the VQ map maintenance functions > arm64/sve: Enable SVE state tracking for non-task contexts > KVM: arm64: Add a vcpu flag to control SVE visibility for the guest > KVM: arm64: Propagate vcpu into read_id_reg() > KVM: arm64: Extend reset_unknown() to handle mixed RES0/UNKNOWN > registers > KVM: arm64: Support runtime sysreg visibility filtering > KVM: arm64/sve: System register context switch and access support > KVM: arm64/sve: Context switch the SVE registers > KVM: Allow 2048-bit register access via ioctl interface > KVM: arm64: Add missing #include of <linux/string.h> in guest.c > KVM: arm64: Reject ioctl access to FPSIMD V-regs on SVE vcpus > KVM: arm64/sve: Add SVE support to register access ioctl interface > KVM: arm64: Enumerate SVE register indices for KVM_GET_REG_LIST > arm64/sve: In-kernel vector length availability query interface > KVM: arm/arm64: Add hook to finalize the vcpu configuration > KVM: arm64/sve: Add pseudo-register for the guest's vector lengths > KVM: arm64/sve: Allow userspace to enable SVE for vcpus > KVM: arm64: Add a capabillity to advertise SVE support > KVM: Document errors for KVM_GET_ONE_REG and KVM_SET_ONE_REG > KVM: arm64/sve: Document KVM API extensions for SVE > > Documentation/virtual/kvm/api.txt | 93 ++++++++++ > arch/arm/include/asm/kvm_host.h | 4 + > arch/arm64/include/asm/fpsimd.h | 33 +++- > arch/arm64/include/asm/kvm_host.h | 35 +++- > arch/arm64/include/asm/kvm_hyp.h | 1 - > arch/arm64/include/asm/sysreg.h | 3 + > arch/arm64/include/uapi/asm/kvm.h | 22 +++ > arch/arm64/kernel/cpufeature.c | 2 +- > arch/arm64/kernel/fpsimd.c | 172 +++++++++++++------ > arch/arm64/kernel/signal.c | 5 - > arch/arm64/kvm/fpsimd.c | 17 +- > arch/arm64/kvm/guest.c | 348 > +++++++++++++++++++++++++++++++++++--- > arch/arm64/kvm/hyp/switch.c | 69 ++++++-- > arch/arm64/kvm/reset.c | 87 +++++++++- > arch/arm64/kvm/sys_regs.c | 144 ++++++++++++++-- > arch/arm64/kvm/sys_regs.h | 24 ++- > include/uapi/linux/kvm.h | 2 + > virt/kvm/arm/arm.c | 8 + > 18 files changed, 944 insertions(+), 125 deletions(-) > > -- > 2.1.4 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel Thanks, Zhang Lei
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