| Message ID | 20190925050649.14926-1-bharata@linux.ibm.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | KVM: PPC: Driver to manage pages of secure guest | expand |
On Wed, Sep 25, 2019 at 10:36:41AM +0530, Bharata B Rao wrote: > [The main change in this version is the introduction of new > locking to prevent concurrent page-in and page-out calls. More > details about this are present in patch 2/8] > > Hi, > > A pseries guest can be run as a secure guest on Ultravisor-enabled > POWER platforms. On such platforms, this driver will be used to manage > the movement of guest pages between the normal memory managed by > hypervisor(HV) and secure memory managed by Ultravisor(UV). > > Private ZONE_DEVICE memory equal to the amount of secure memory > available in the platform for running secure guests is created. > Whenever a page belonging to the guest becomes secure, a page from > this private device memory is used to represent and track that secure > page on the HV side. The movement of pages between normal and secure > memory is done via migrate_vma_pages(). The reverse movement is driven > via pagemap_ops.migrate_to_ram(). > > The page-in or page-out requests from UV will come to HV as hcalls and > HV will call back into UV via uvcalls to satisfy these page requests. > > These patches are against hmm.git > (https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/log/?h=hmm) > > plus > > Claudio Carvalho's base ultravisor enablement patches that are present > in Michael Ellerman's tree > (https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/log/?h=topic/ppc-kvm) > > These patches along with Claudio's above patches are required to > run secure pseries guests on KVM. This patchset is based on hmm.git > because hmm.git has migrate_vma cleanup and not-device memremap_pages > patchsets that are required by this patchset. FWIW this is all merged to Linus now and will be in rc1 Jason
[The main change in this version is the introduction of new locking to prevent concurrent page-in and page-out calls. More details about this are present in patch 2/8] Hi, A pseries guest can be run as a secure guest on Ultravisor-enabled POWER platforms. On such platforms, this driver will be used to manage the movement of guest pages between the normal memory managed by hypervisor(HV) and secure memory managed by Ultravisor(UV). Private ZONE_DEVICE memory equal to the amount of secure memory available in the platform for running secure guests is created. Whenever a page belonging to the guest becomes secure, a page from this private device memory is used to represent and track that secure page on the HV side. The movement of pages between normal and secure memory is done via migrate_vma_pages(). The reverse movement is driven via pagemap_ops.migrate_to_ram(). The page-in or page-out requests from UV will come to HV as hcalls and HV will call back into UV via uvcalls to satisfy these page requests. These patches are against hmm.git (https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/log/?h=hmm) plus Claudio Carvalho's base ultravisor enablement patches that are present in Michael Ellerman's tree (https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/log/?h=topic/ppc-kvm) These patches along with Claudio's above patches are required to run secure pseries guests on KVM. This patchset is based on hmm.git because hmm.git has migrate_vma cleanup and not-device memremap_pages patchsets that are required by this patchset. Changes in v9 ============= - Prevent concurrent page-in and page-out calls. - Ensure device PFNs are allocated for zero-pages that are sent to UV. - Failure to migrate a page during page-in will now return error via hcall. - Address review comments by Suka - Misc cleanups v8: https://lore.kernel.org/linux-mm/20190910082946.7849-2-bharata@linux.ibm.com/T/ Anshuman Khandual (1): KVM: PPC: Ultravisor: Add PPC_UV config option Bharata B Rao (6): KVM: PPC: Move pages between normal and secure memory KVM: PPC: Shared pages support for secure guests KVM: PPC: H_SVM_INIT_START and H_SVM_INIT_DONE hcalls KVM: PPC: Handle memory plug/unplug to secure VM KVM: PPC: Radix changes for secure guest KVM: PPC: Support reset of secure guest Suraj Jitindar Singh (1): KVM: PPC: Book3S HV: Define usage types for rmap array in guest memslot Documentation/virt/kvm/api.txt | 19 + arch/powerpc/Kconfig | 17 + arch/powerpc/include/asm/hvcall.h | 9 + arch/powerpc/include/asm/kvm_book3s_uvmem.h | 48 ++ arch/powerpc/include/asm/kvm_host.h | 57 +- arch/powerpc/include/asm/kvm_ppc.h | 2 + arch/powerpc/include/asm/ultravisor-api.h | 6 + arch/powerpc/include/asm/ultravisor.h | 36 ++ arch/powerpc/kvm/Makefile | 3 + arch/powerpc/kvm/book3s_64_mmu_radix.c | 22 + arch/powerpc/kvm/book3s_hv.c | 122 ++++ arch/powerpc/kvm/book3s_hv_rm_mmu.c | 2 +- arch/powerpc/kvm/book3s_hv_uvmem.c | 673 ++++++++++++++++++++ arch/powerpc/kvm/powerpc.c | 12 + include/uapi/linux/kvm.h | 1 + 15 files changed, 1024 insertions(+), 5 deletions(-) create mode 100644 arch/powerpc/include/asm/kvm_book3s_uvmem.h create mode 100644 arch/powerpc/kvm/book3s_hv_uvmem.c