This patchset adds support for the new hcall H_RPT_INVALIDATE and replaces the nested tlb flush calls with this new hcall if support for the same exists. Changes in v2: ------------- - Not enabling the hcall by default now, userspace can enable it when required. - Added implementation for process-scoped invalidations in the hcall. v1: https://lore.kernel.org/linuxppc-dev/20201019112642.53016-1-bharata@xxxxxxxxxxxxx/T/#t H_RPT_INVALIDATE ================ Syntax: int64 /* H_Success: Return code on successful completion */ /* H_Busy - repeat the call with the same */ /* H_Parameter, H_P2, H_P3, H_P4, H_P5 : Invalid parameters */ hcall(const uint64 H_RPT_INVALIDATE, /* Invalidate RPT translation lookaside information */ uint64 pid, /* PID/LPID to invalidate */ uint64 target, /* Invalidation target */ uint64 type, /* Type of lookaside information */ uint64 pageSizes, /* Page sizes */ uint64 start, /* Start of Effective Address (EA) range (inclusive) */ uint64 end) /* End of EA range (exclusive) */ Invalidation targets (target) ----------------------------- Core MMU 0x01 /* All virtual processors in the partition */ Core local MMU 0x02 /* Current virtual processor */ Nest MMU 0x04 /* All nest/accelerator agents in use by the partition */ A combination of the above can be specified, except core and core local. Type of translation to invalidate (type) --------------------------------------- NESTED 0x0001 /* Invalidate nested guest partition-scope */ TLB 0x0002 /* Invalidate TLB */ PWC 0x0004 /* Invalidate Page Walk Cache */ PRT 0x0008 /* Invalidate Process Table Entries if NESTED is clear */ PAT 0x0008 /* Invalidate Partition Table Entries if NESTED is set */ A combination of the above can be specified. Page size mask (pageSizes) -------------------------- 4K 0x01 64K 0x02 2M 0x04 1G 0x08 All sizes (-1UL) A combination of the above can be specified. All page sizes can be selected with -1. Semantics: Invalidate radix tree lookaside information matching the parameters given. * Return H_P2, H_P3 or H_P4 if target, type, or pageSizes parameters are different from the defined values. * Return H_PARAMETER if NESTED is set and pid is not a valid nested LPID allocated to this partition * Return H_P5 if (start, end) doesn't form a valid range. Start and end should be a valid Quadrant address and end > start. * Return H_NotSupported if the partition is not in running in radix translation mode. * May invalidate more translation information than requested. * If start = 0 and end = -1, set the range to cover all valid addresses. Else start and end should be aligned to 4kB (lower 11 bits clear). * If NESTED is clear, then invalidate process scoped lookaside information. Else pid specifies a nested LPID, and the invalidation is performed on nested guest partition table and nested guest partition scope real addresses. * If pid = 0 and NESTED is clear, then valid addresses are quadrant 3 and quadrant 0 spaces, Else valid addresses are quadrant 0. * Pages which are fully covered by the range are to be invalidated. Those which are partially covered are considered outside invalidation range, which allows a caller to optimally invalidate ranges that may contain mixed page sizes. * Return H_SUCCESS on success. Bharata B Rao (2): KVM: PPC: Book3S HV: Add support for H_RPT_INVALIDATE KVM: PPC: Book3S HV: Use H_RPT_INVALIDATE in nested KVM Documentation/virt/kvm/api.rst | 17 +++ .../include/asm/book3s/64/tlbflush-radix.h | 18 +++ arch/powerpc/include/asm/kvm_book3s.h | 3 + arch/powerpc/kvm/book3s_64_mmu_radix.c | 27 +++- arch/powerpc/kvm/book3s_hv.c | 121 ++++++++++++++++++ arch/powerpc/kvm/book3s_hv_nested.c | 106 ++++++++++++++- arch/powerpc/kvm/powerpc.c | 3 + arch/powerpc/mm/book3s64/radix_tlb.c | 4 - include/uapi/linux/kvm.h | 1 + 9 files changed, 289 insertions(+), 11 deletions(-) -- 2.26.2
