This part of the Secure Encrypted Paging (SEV-SNP) series focuses on the changes required in a host OS for SEV-SNP support. The series builds upon SEV-SNP Part-1 https://marc.info/?l=kvm&m=161660430125343&w=2 .
This series provides the basic building blocks to support booting the SEV-SNP VMs, it does not cover all the security enhancement introduced by the SEV-SNP such as interrupt protection. The CCP driver is enhanced to provide new APIs that use the SEV-SNP specific commands defined in the SEV-SNP firmware specification. The KVM driver uses those APIs to create and managed the SEV-SNP guests. The GHCB specification version 2 introduces new set of NAE's that is used by the SEV-SNP guest to communicate with the hypervisor. The series provides support to handle the following new NAE events: - Register GHCB GPA - Page State Change Request The RMP check is enforced as soon as SEV-SNP is enabled. Not every memory access requires an RMP check. In particular, the read accesses from the hypervisor do not require RMP checks because the data confidentiality is already protected via memory encryption. When hardware encounters an RMP checks failure, it raises a page-fault exception. If RMP check failure is due to the page-size mismatch, then split the large page to resolve the fault. See patch 4 and 7 for further details. The series does not provide support for the following SEV-SNP specific NAE's yet: * Query Attestation * AP bring up * Interrupt security The series is based on kvm/master commit: 87aa9ec939ec KVM: x86/mmu: Fix TDP MMU zap collapsible SPTEs The complete source is available at https://github.com/AMDESE/linux/tree/sev-snp-part-2-rfc1 Cc: Thomas Gleixner <t...@linutronix.de> Cc: Ingo Molnar <mi...@redhat.com> Cc: Borislav Petkov <b...@alien8.de> Cc: Joerg Roedel <jroe...@suse.de> Cc: "H. Peter Anvin" <h...@zytor.com> Cc: Tony Luck <tony.l...@intel.com> Cc: Dave Hansen <dave.han...@intel.com> Cc: "Peter Zijlstra (Intel)" <pet...@infradead.org> Cc: Paolo Bonzini <pbonz...@redhat.com> Cc: Tom Lendacky <thomas.lenda...@amd.com> Cc: David Rientjes <rient...@google.com> Cc: Sean Christopherson <sea...@google.com> Cc: x...@kernel.org Cc: k...@vger.kernel.org Additional resources --------------------- SEV-SNP whitepaper https://www.amd.com/system/files/TechDocs/SEV-SNP-strengthening-vm-isolation-with-integrity-protection-and-more.pdf APM 2: https://www.amd.com/system/files/TechDocs/24593.pdf (section 15.36) GHCB spec v2: The draft specification is posted on AMD-SEV-SNP mailing list: https://lists.suse.com/mailman/private/amd-sev-snp/ Copy of draft spec is also available at https://github.com/AMDESE/AMDSEV/blob/sev-snp-devel/docs/56421-Guest_Hypervisor_Communication_Block_Standardization.pdf GHCB spec v1: SEV-SNP firmware specification: https://developer.amd.com/sev/ Brijesh Singh (30): x86: Add the host SEV-SNP initialization support x86/sev-snp: add RMP entry lookup helpers x86: add helper functions for RMPUPDATE and PSMASH instruction x86/mm: split the physmap when adding the page in RMP table x86: define RMP violation #PF error code x86/fault: dump the RMP entry on #PF mm: add support to split the large THP based on RMP violation crypto:ccp: define the SEV-SNP commands crypto: ccp: Add support to initialize the AMD-SP for SEV-SNP crypto: ccp: shutdown SNP firmware on kexec crypto:ccp: provide APIs to issue SEV-SNP commands crypto ccp: handle the legacy SEV command when SNP is enabled KVM: SVM: add initial SEV-SNP support KVM: SVM: make AVIC backing, VMSA and VMCB memory allocation SNP safe KVM: SVM: define new SEV_FEATURES field in the VMCB Save State Area KVM: SVM: add KVM_SNP_INIT command KVM: SVM: add KVM_SEV_SNP_LAUNCH_START command KVM: SVM: add KVM_SEV_SNP_LAUNCH_UPDATE command KVM: SVM: Reclaim the guest pages when SEV-SNP VM terminates KVM: SVM: add KVM_SEV_SNP_LAUNCH_FINISH command KVM: X86: Add kvm_x86_ops to get the max page level for the TDP x86/mmu: Introduce kvm_mmu_map_tdp_page() for use by SEV KVM: X86: Introduce kvm_mmu_get_tdp_walk() for SEV-SNP use KVM: X86: define new RMP check related #NPF error bits KVM: X86: update page-fault trace to log the 64-bit error code KVM: SVM: add support to handle GHCB GPA register VMGEXIT KVM: SVM: add support to handle MSR based Page State Change VMGEXIT KVM: SVM: add support to handle Page State Change VMGEXIT KVM: X86: export the kvm_zap_gfn_range() for the SNP use KVM: X86: Add support to handle the RMP nested page fault arch/x86/include/asm/kvm_host.h | 14 + arch/x86/include/asm/msr-index.h | 6 + arch/x86/include/asm/sev-snp.h | 68 +++ arch/x86/include/asm/svm.h | 12 +- arch/x86/include/asm/trap_pf.h | 2 + arch/x86/kvm/lapic.c | 5 +- arch/x86/kvm/mmu.h | 5 +- arch/x86/kvm/mmu/mmu.c | 76 ++- arch/x86/kvm/svm/sev.c | 925 ++++++++++++++++++++++++++++++- arch/x86/kvm/svm/svm.c | 28 +- arch/x86/kvm/svm/svm.h | 49 ++ arch/x86/kvm/trace.h | 6 +- arch/x86/kvm/vmx/vmx.c | 8 + arch/x86/mm/fault.c | 157 ++++++ arch/x86/mm/mem_encrypt.c | 163 ++++++ drivers/crypto/ccp/sev-dev.c | 312 ++++++++++- drivers/crypto/ccp/sev-dev.h | 3 + drivers/crypto/ccp/sp-pci.c | 12 + include/linux/mm.h | 6 +- include/linux/psp-sev.h | 311 +++++++++++ include/uapi/linux/kvm.h | 42 ++ include/uapi/linux/psp-sev.h | 27 + mm/memory.c | 11 + 23 files changed, 2224 insertions(+), 24 deletions(-) -- 2.17.1
