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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-31 02:36:45 +0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-31 02:36:45 +0400 |
commit | 1bc87b00556e8f7ba30a1010471951c5b8f71114 (patch) | |
tree | e73c2d187e2dff0df97ed82e32b45e362b923117 /virt/kvm/kvm_main.c | |
parent | acff987d94cbdb4049f3706bed1f1792f8ef6837 (diff) | |
parent | f1c1da2bde712812a3e0f9a7a7ebe7a916a4b5f4 (diff) | |
download | linux-1bc87b00556e8f7ba30a1010471951c5b8f71114.tar.xz |
Merge branch 'kvm-updates/3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm
* 'kvm-updates/3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm: (75 commits)
KVM: SVM: Keep intercepting task switching with NPT enabled
KVM: s390: implement sigp external call
KVM: s390: fix register setting
KVM: s390: fix return value of kvm_arch_init_vm
KVM: s390: check cpu_id prior to using it
KVM: emulate lapic tsc deadline timer for guest
x86: TSC deadline definitions
KVM: Fix simultaneous NMIs
KVM: x86 emulator: convert push %sreg/pop %sreg to direct decode
KVM: x86 emulator: switch lds/les/lss/lfs/lgs to direct decode
KVM: x86 emulator: streamline decode of segment registers
KVM: x86 emulator: simplify OpMem64 decode
KVM: x86 emulator: switch src decode to decode_operand()
KVM: x86 emulator: qualify OpReg inhibit_byte_regs hack
KVM: x86 emulator: switch OpImmUByte decode to decode_imm()
KVM: x86 emulator: free up some flag bits near src, dst
KVM: x86 emulator: switch src2 to generic decode_operand()
KVM: x86 emulator: expand decode flags to 64 bits
KVM: x86 emulator: split dst decode to a generic decode_operand()
KVM: x86 emulator: move memop, memopp into emulation context
...
Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r-- | virt/kvm/kvm_main.c | 112 |
1 files changed, 100 insertions, 12 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index aefdda390f5e..d9cfb782cb81 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -47,6 +47,8 @@ #include <linux/srcu.h> #include <linux/hugetlb.h> #include <linux/slab.h> +#include <linux/sort.h> +#include <linux/bsearch.h> #include <asm/processor.h> #include <asm/io.h> @@ -2391,24 +2393,92 @@ static void kvm_io_bus_destroy(struct kvm_io_bus *bus) int i; for (i = 0; i < bus->dev_count; i++) { - struct kvm_io_device *pos = bus->devs[i]; + struct kvm_io_device *pos = bus->range[i].dev; kvm_iodevice_destructor(pos); } kfree(bus); } +int kvm_io_bus_sort_cmp(const void *p1, const void *p2) +{ + const struct kvm_io_range *r1 = p1; + const struct kvm_io_range *r2 = p2; + + if (r1->addr < r2->addr) + return -1; + if (r1->addr + r1->len > r2->addr + r2->len) + return 1; + return 0; +} + +int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, + gpa_t addr, int len) +{ + if (bus->dev_count == NR_IOBUS_DEVS) + return -ENOSPC; + + bus->range[bus->dev_count++] = (struct kvm_io_range) { + .addr = addr, + .len = len, + .dev = dev, + }; + + sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), + kvm_io_bus_sort_cmp, NULL); + + return 0; +} + +int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, + gpa_t addr, int len) +{ + struct kvm_io_range *range, key; + int off; + + key = (struct kvm_io_range) { + .addr = addr, + .len = len, + }; + + range = bsearch(&key, bus->range, bus->dev_count, + sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); + if (range == NULL) + return -ENOENT; + + off = range - bus->range; + + while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0) + off--; + + return off; +} + /* kvm_io_bus_write - called under kvm->slots_lock */ int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len, const void *val) { - int i; + int idx; struct kvm_io_bus *bus; + struct kvm_io_range range; + + range = (struct kvm_io_range) { + .addr = addr, + .len = len, + }; bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); - for (i = 0; i < bus->dev_count; i++) - if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) + idx = kvm_io_bus_get_first_dev(bus, addr, len); + if (idx < 0) + return -EOPNOTSUPP; + + while (idx < bus->dev_count && + kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { + if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val)) return 0; + idx++; + } + return -EOPNOTSUPP; } @@ -2416,19 +2486,33 @@ int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len, void *val) { - int i; + int idx; struct kvm_io_bus *bus; + struct kvm_io_range range; + + range = (struct kvm_io_range) { + .addr = addr, + .len = len, + }; bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); - for (i = 0; i < bus->dev_count; i++) - if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) + idx = kvm_io_bus_get_first_dev(bus, addr, len); + if (idx < 0) + return -EOPNOTSUPP; + + while (idx < bus->dev_count && + kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { + if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val)) return 0; + idx++; + } + return -EOPNOTSUPP; } /* Caller must hold slots_lock. */ -int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, - struct kvm_io_device *dev) +int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, + int len, struct kvm_io_device *dev) { struct kvm_io_bus *new_bus, *bus; @@ -2440,7 +2524,7 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, if (!new_bus) return -ENOMEM; memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); - new_bus->devs[new_bus->dev_count++] = dev; + kvm_io_bus_insert_dev(new_bus, dev, addr, len); rcu_assign_pointer(kvm->buses[bus_idx], new_bus); synchronize_srcu_expedited(&kvm->srcu); kfree(bus); @@ -2464,9 +2548,13 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, r = -ENOENT; for (i = 0; i < new_bus->dev_count; i++) - if (new_bus->devs[i] == dev) { + if (new_bus->range[i].dev == dev) { r = 0; - new_bus->devs[i] = new_bus->devs[--new_bus->dev_count]; + new_bus->dev_count--; + new_bus->range[i] = new_bus->range[new_bus->dev_count]; + sort(new_bus->range, new_bus->dev_count, + sizeof(struct kvm_io_range), + kvm_io_bus_sort_cmp, NULL); break; } |