From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bharata B Rao Date: Wed, 16 Dec 2020 08:58:12 +0000 Subject: [PATCH v2 0/2] Support for H_RPT_INVALIDATE in PowerPC KVM Message-Id: <20201216085447.1265433-1-bharata@linux.ibm.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit To: kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: aneesh.kumar@linux.ibm.com, npiggin@gmail.com, Bharata B Rao , david@gibson.dropbear.id.au 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@linux.ibm.com/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