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author | Avi Kivity <avi@redhat.com> | 2012-05-08 17:00:13 +0300 |
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committer | Avi Kivity <avi@redhat.com> | 2012-05-08 17:00:13 +0300 |
commit | f2569053e0b3ae092e2f35514f8d108647baa01f (patch) | |
tree | f850e7d06b446c6bc598d12d40b2582ef274abf7 /Documentation | |
parent | 9f4260e73ac43aaa91eb5de95950e1de7002f467 (diff) | |
parent | 54771e6217ce05a474827d9b23ff03de9d2ef2a0 (diff) | |
download | op-kernel-dev-f2569053e0b3ae092e2f35514f8d108647baa01f.zip op-kernel-dev-f2569053e0b3ae092e2f35514f8d108647baa01f.tar.gz |
Merge branch 'for-upstream' of git://github.com/agraf/linux-2.6 into next
PPC updates from Alex.
* 'for-upstream' of git://github.com/agraf/linux-2.6:
KVM: PPC: Emulator: clean up SPR reads and writes
KVM: PPC: Emulator: clean up instruction parsing
kvm/powerpc: Add new ioctl to retreive server MMU infos
kvm/book3s: Make kernel emulated H_PUT_TCE available for "PR" KVM
KVM: PPC: bookehv: Fix r8/r13 storing in level exception handler
KVM: PPC: Book3S: Enable IRQs during exit handling
KVM: PPC: Fix PR KVM on POWER7 bare metal
KVM: PPC: Fix stbux emulation
KVM: PPC: bookehv: Use lwz/stw instead of PPC_LL/PPC_STL for 32-bit fields
KVM: PPC: Book3S: PR: No isync in slbie path
KVM: PPC: Book3S: PR: Optimize entry path
KVM: PPC: booke(hv): Fix save/restore of guest accessible SPRGs.
KVM: PPC: Restrict PPC_[L|ST]D macro to asm code
KVM: PPC: bookehv: Use a Macro for saving/restoring guest registers to/from their 64 bit copies.
KVM: PPC: Use clockevent multiplier and shifter for decrementer
KVM: Use minimum and maximum address mapped by TLB1
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/virtual/kvm/api.txt | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index eb62761..9301266 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1860,6 +1860,76 @@ See KVM_GET_PIT2 for details on struct kvm_pit_state2. This IOCTL replaces the obsolete KVM_SET_PIT. +4.74 KVM_PPC_GET_SMMU_INFO + +Capability: KVM_CAP_PPC_GET_SMMU_INFO +Architectures: powerpc +Type: vm ioctl +Parameters: None +Returns: 0 on success, -1 on error + +This populates and returns a structure describing the features of +the "Server" class MMU emulation supported by KVM. +This can in turn be used by userspace to generate the appropariate +device-tree properties for the guest operating system. + +The structure contains some global informations, followed by an +array of supported segment page sizes: + + struct kvm_ppc_smmu_info { + __u64 flags; + __u32 slb_size; + __u32 pad; + struct kvm_ppc_one_seg_page_size sps[KVM_PPC_PAGE_SIZES_MAX_SZ]; + }; + +The supported flags are: + + - KVM_PPC_PAGE_SIZES_REAL: + When that flag is set, guest page sizes must "fit" the backing + store page sizes. When not set, any page size in the list can + be used regardless of how they are backed by userspace. + + - KVM_PPC_1T_SEGMENTS + The emulated MMU supports 1T segments in addition to the + standard 256M ones. + +The "slb_size" field indicates how many SLB entries are supported + +The "sps" array contains 8 entries indicating the supported base +page sizes for a segment in increasing order. Each entry is defined +as follow: + + struct kvm_ppc_one_seg_page_size { + __u32 page_shift; /* Base page shift of segment (or 0) */ + __u32 slb_enc; /* SLB encoding for BookS */ + struct kvm_ppc_one_page_size enc[KVM_PPC_PAGE_SIZES_MAX_SZ]; + }; + +An entry with a "page_shift" of 0 is unused. Because the array is +organized in increasing order, a lookup can stop when encoutering +such an entry. + +The "slb_enc" field provides the encoding to use in the SLB for the +page size. The bits are in positions such as the value can directly +be OR'ed into the "vsid" argument of the slbmte instruction. + +The "enc" array is a list which for each of those segment base page +size provides the list of supported actual page sizes (which can be +only larger or equal to the base page size), along with the +corresponding encoding in the hash PTE. Similarily, the array is +8 entries sorted by increasing sizes and an entry with a "0" shift +is an empty entry and a terminator: + + struct kvm_ppc_one_page_size { + __u32 page_shift; /* Page shift (or 0) */ + __u32 pte_enc; /* Encoding in the HPTE (>>12) */ + }; + +The "pte_enc" field provides a value that can OR'ed into the hash +PTE's RPN field (ie, it needs to be shifted left by 12 to OR it +into the hash PTE second double word). + 5. The kvm_run structure ------------------------ |