Second batch of KVM changes for 4.11 merge window
PPC:
* correct assumption about ASDR on POWER9
* fix MMIO emulation on POWER9
x86:
* add a simple test for ioperm
* cleanup TSS
(going through KVM tree as the whole undertaking was caused by VMX's
use of TSS)
* fix nVMX interrupt delivery
* fix some performance counters in the guest
And two cleanup patches.
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Merge tag 'kvm-4.11-2' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull more KVM updates from Radim Krčmář:
"Second batch of KVM changes for the 4.11 merge window:
PPC:
- correct assumption about ASDR on POWER9
- fix MMIO emulation on POWER9
x86:
- add a simple test for ioperm
- cleanup TSS (going through KVM tree as the whole undertaking was
caused by VMX's use of TSS)
- fix nVMX interrupt delivery
- fix some performance counters in the guest
... and two cleanup patches"
* tag 'kvm-4.11-2' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: nVMX: Fix pending events injection
x86/kvm/vmx: remove unused variable in segment_base()
selftests/x86: Add a basic selftest for ioperm
x86/asm: Tidy up TSS limit code
kvm: convert kvm.users_count from atomic_t to refcount_t
KVM: x86: never specify a sample period for virtualized in_tx_cp counters
KVM: PPC: Book3S HV: Don't use ASDR for real-mode HPT faults on POWER9
KVM: PPC: Book3S HV: Fix software walk of guest process page tables
This commit is contained in:
Linus Torvalds
Коммит
2d62e0768d
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|
@ -46,7 +46,7 @@ extern struct patb_entry *partition_tb;
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/* Bits in patb0 field */
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#define PATB_HR (1UL << 63)
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#define RPDB_MASK 0x0ffffffffffff00fUL
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#define RPDB_MASK 0x0fffffffffffff00UL
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#define RPDB_SHIFT (1UL << 8)
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#define RTS1_SHIFT 61 /* top 2 bits of radix tree size */
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#define RTS1_MASK (3UL << RTS1_SHIFT)
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@ -57,6 +57,7 @@ extern struct patb_entry *partition_tb;
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/* Bits in patb1 field */
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#define PATB_GR (1UL << 63) /* guest uses radix; must match HR */
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#define PRTS_MASK 0x1f /* process table size field */
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#define PRTB_MASK 0x0ffffffffffff000UL
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/*
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* Limit process table to PAGE_SIZE table. This
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|
|
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@ -32,6 +32,7 @@ int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
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u32 pid;
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int ret, level, ps;
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__be64 prte, rpte;
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unsigned long ptbl;
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unsigned long root, pte, index;
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unsigned long rts, bits, offset;
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unsigned long gpa;
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@ -53,8 +54,8 @@ int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
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return -EINVAL;
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/* Read partition table to find root of tree for effective PID */
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ret = kvm_read_guest(kvm, kvm->arch.process_table + pid * 16,
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&prte, sizeof(prte));
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ptbl = (kvm->arch.process_table & PRTB_MASK) + (pid * 16);
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ret = kvm_read_guest(kvm, ptbl, &prte, sizeof(prte));
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if (ret)
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return ret;
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|
|
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@ -1787,12 +1787,12 @@ kvmppc_hdsi:
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/* HPTE not found fault or protection fault? */
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andis. r0, r6, (DSISR_NOHPTE | DSISR_PROTFAULT)@h
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beq 1f /* if not, send it to the guest */
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andi. r0, r11, MSR_DR /* data relocation enabled? */
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beq 3f
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BEGIN_FTR_SECTION
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mfspr r5, SPRN_ASDR /* on POWER9, use ASDR to get VSID */
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b 4f
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END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
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andi. r0, r11, MSR_DR /* data relocation enabled? */
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beq 3f
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clrrdi r0, r4, 28
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PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */
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li r0, BOOK3S_INTERRUPT_DATA_SEGMENT
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@ -1879,12 +1879,12 @@ kvmppc_hisi:
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bne .Lradix_hisi /* for radix, just save ASDR */
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andis. r0, r11, SRR1_ISI_NOPT@h
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beq 1f
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andi. r0, r11, MSR_IR /* instruction relocation enabled? */
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beq 3f
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BEGIN_FTR_SECTION
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mfspr r5, SPRN_ASDR /* on POWER9, use ASDR to get VSID */
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b 4f
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END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
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andi. r0, r11, MSR_IR /* instruction relocation enabled? */
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beq 3f
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clrrdi r0, r10, 28
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PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */
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li r0, BOOK3S_INTERRUPT_INST_SEGMENT
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|
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@ -205,6 +205,8 @@ static inline void native_load_tr_desc(void)
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asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8));
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}
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DECLARE_PER_CPU(bool, __tss_limit_invalid);
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static inline void force_reload_TR(void)
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{
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struct desc_struct *d = get_cpu_gdt_table(smp_processor_id());
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|
@ -220,18 +222,20 @@ static inline void force_reload_TR(void)
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write_gdt_entry(d, GDT_ENTRY_TSS, &tss, DESC_TSS);
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load_TR_desc();
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this_cpu_write(__tss_limit_invalid, false);
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}
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DECLARE_PER_CPU(bool, need_tr_refresh);
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static inline void refresh_TR(void)
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/*
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* Call this if you need the TSS limit to be correct, which should be the case
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* if and only if you have TIF_IO_BITMAP set or you're switching to a task
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* with TIF_IO_BITMAP set.
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*/
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static inline void refresh_tss_limit(void)
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{
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DEBUG_LOCKS_WARN_ON(preemptible());
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if (unlikely(this_cpu_read(need_tr_refresh))) {
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if (unlikely(this_cpu_read(__tss_limit_invalid)))
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force_reload_TR();
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this_cpu_write(need_tr_refresh, false);
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}
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}
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/*
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|
@ -250,7 +254,7 @@ static inline void invalidate_tss_limit(void)
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if (unlikely(test_thread_flag(TIF_IO_BITMAP)))
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force_reload_TR();
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else
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this_cpu_write(need_tr_refresh, true);
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this_cpu_write(__tss_limit_invalid, true);
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}
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static inline void native_load_gdt(const struct desc_ptr *dtr)
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|
|
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|
|
@ -48,8 +48,14 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
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t->io_bitmap_ptr = bitmap;
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set_thread_flag(TIF_IO_BITMAP);
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/*
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* Now that we have an IO bitmap, we need our TSS limit to be
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* correct. It's fine if we are preempted after doing this:
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* with TIF_IO_BITMAP set, context switches will keep our TSS
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* limit correct.
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*/
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preempt_disable();
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refresh_TR();
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refresh_tss_limit();
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preempt_enable();
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}
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|
|
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|
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@ -69,8 +69,8 @@ __visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss) = {
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};
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EXPORT_PER_CPU_SYMBOL(cpu_tss);
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DEFINE_PER_CPU(bool, need_tr_refresh);
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EXPORT_PER_CPU_SYMBOL_GPL(need_tr_refresh);
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DEFINE_PER_CPU(bool, __tss_limit_invalid);
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EXPORT_PER_CPU_SYMBOL_GPL(__tss_limit_invalid);
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/*
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* this gets called so that we can store lazy state into memory and copy the
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|
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@ -222,7 +222,7 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
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* Make sure that the TSS limit is correct for the CPU
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* to notice the IO bitmap.
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*/
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refresh_TR();
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refresh_tss_limit();
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} else if (test_tsk_thread_flag(prev_p, TIF_IO_BITMAP)) {
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/*
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* Clear any possible leftover bits:
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|
|
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|
|
@ -113,12 +113,19 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
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.config = config,
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};
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attr.sample_period = (-pmc->counter) & pmc_bitmask(pmc);
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if (in_tx)
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attr.config |= HSW_IN_TX;
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if (in_tx_cp)
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if (in_tx_cp) {
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/*
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* HSW_IN_TX_CHECKPOINTED is not supported with nonzero
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* period. Just clear the sample period so at least
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* allocating the counter doesn't fail.
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*/
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attr.sample_period = 0;
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attr.config |= HSW_IN_TX_CHECKPOINTED;
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attr.sample_period = (-pmc->counter) & pmc_bitmask(pmc);
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}
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|
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event = perf_event_create_kernel_counter(&attr, -1, current,
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intr ? kvm_perf_overflow_intr :
|
||||
|
|
|
|||
|
|
@ -2053,7 +2053,6 @@ static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
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|||
static unsigned long segment_base(u16 selector)
|
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{
|
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struct desc_ptr *gdt = this_cpu_ptr(&host_gdt);
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struct desc_struct *d;
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struct desc_struct *table;
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unsigned long v;
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|
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|
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@ -10642,6 +10641,11 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
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{
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struct vcpu_vmx *vmx = to_vmx(vcpu);
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|
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if (vcpu->arch.exception.pending ||
|
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vcpu->arch.nmi_injected ||
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vcpu->arch.interrupt.pending)
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return -EBUSY;
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|
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if (nested_cpu_has_preemption_timer(get_vmcs12(vcpu)) &&
|
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vmx->nested.preemption_timer_expired) {
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if (vmx->nested.nested_run_pending)
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|
|
@ -10651,8 +10655,7 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
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}
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if (vcpu->arch.nmi_pending && nested_exit_on_nmi(vcpu)) {
|
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if (vmx->nested.nested_run_pending ||
|
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vcpu->arch.interrupt.pending)
|
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if (vmx->nested.nested_run_pending)
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return -EBUSY;
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nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
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NMI_VECTOR | INTR_TYPE_NMI_INTR |
|
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|
|
|
|||
|
|
@ -26,6 +26,7 @@
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|||
#include <linux/context_tracking.h>
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#include <linux/irqbypass.h>
|
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#include <linux/swait.h>
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#include <linux/refcount.h>
|
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#include <asm/signal.h>
|
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|
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#include <linux/kvm.h>
|
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|
|
@ -401,7 +402,7 @@ struct kvm {
|
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#endif
|
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struct kvm_vm_stat stat;
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struct kvm_arch arch;
|
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atomic_t users_count;
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refcount_t users_count;
|
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#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
|
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struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
|
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spinlock_t ring_lock;
|
||||
|
|
|
|||
|
|
@ -5,7 +5,7 @@ include ../lib.mk
|
|||
.PHONY: all all_32 all_64 warn_32bit_failure clean
|
||||
|
||||
TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt ptrace_syscall test_mremap_vdso \
|
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check_initial_reg_state sigreturn ldt_gdt iopl mpx-mini-test \
|
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check_initial_reg_state sigreturn ldt_gdt iopl mpx-mini-test ioperm \
|
||||
protection_keys test_vdso
|
||||
TARGETS_C_32BIT_ONLY := entry_from_vm86 syscall_arg_fault test_syscall_vdso unwind_vdso \
|
||||
test_FCMOV test_FCOMI test_FISTTP \
|
||||
|
|
|
|||
|
|
@ -0,0 +1,170 @@
|
|||
/*
|
||||
* ioperm.c - Test case for ioperm(2)
|
||||
* Copyright (c) 2015 Andrew Lutomirski
|
||||
*/
|
||||
|
||||
#define _GNU_SOURCE
|
||||
#include <err.h>
|
||||
#include <stdio.h>
|
||||
#include <stdint.h>
|
||||
#include <signal.h>
|
||||
#include <setjmp.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <errno.h>
|
||||
#include <unistd.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/wait.h>
|
||||
#include <stdbool.h>
|
||||
#include <sched.h>
|
||||
#include <sys/io.h>
|
||||
|
||||
static int nerrs = 0;
|
||||
|
||||
static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
|
||||
int flags)
|
||||
{
|
||||
struct sigaction sa;
|
||||
memset(&sa, 0, sizeof(sa));
|
||||
sa.sa_sigaction = handler;
|
||||
sa.sa_flags = SA_SIGINFO | flags;
|
||||
sigemptyset(&sa.sa_mask);
|
||||
if (sigaction(sig, &sa, 0))
|
||||
err(1, "sigaction");
|
||||
|
||||
}
|
||||
|
||||
static void clearhandler(int sig)
|
||||
{
|
||||
struct sigaction sa;
|
||||
memset(&sa, 0, sizeof(sa));
|
||||
sa.sa_handler = SIG_DFL;
|
||||
sigemptyset(&sa.sa_mask);
|
||||
if (sigaction(sig, &sa, 0))
|
||||
err(1, "sigaction");
|
||||
}
|
||||
|
||||
static jmp_buf jmpbuf;
|
||||
|
||||
static void sigsegv(int sig, siginfo_t *si, void *ctx_void)
|
||||
{
|
||||
siglongjmp(jmpbuf, 1);
|
||||
}
|
||||
|
||||
static bool try_outb(unsigned short port)
|
||||
{
|
||||
sethandler(SIGSEGV, sigsegv, SA_RESETHAND);
|
||||
if (sigsetjmp(jmpbuf, 1) != 0) {
|
||||
return false;
|
||||
} else {
|
||||
asm volatile ("outb %%al, %w[port]"
|
||||
: : [port] "Nd" (port), "a" (0));
|
||||
return true;
|
||||
}
|
||||
clearhandler(SIGSEGV);
|
||||
}
|
||||
|
||||
static void expect_ok(unsigned short port)
|
||||
{
|
||||
if (!try_outb(port)) {
|
||||
printf("[FAIL]\toutb to 0x%02hx failed\n", port);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
printf("[OK]\toutb to 0x%02hx worked\n", port);
|
||||
}
|
||||
|
||||
static void expect_gp(unsigned short port)
|
||||
{
|
||||
if (try_outb(port)) {
|
||||
printf("[FAIL]\toutb to 0x%02hx worked\n", port);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
printf("[OK]\toutb to 0x%02hx failed\n", port);
|
||||
}
|
||||
|
||||
int main(void)
|
||||
{
|
||||
cpu_set_t cpuset;
|
||||
CPU_ZERO(&cpuset);
|
||||
CPU_SET(0, &cpuset);
|
||||
if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0)
|
||||
err(1, "sched_setaffinity to CPU 0");
|
||||
|
||||
expect_gp(0x80);
|
||||
expect_gp(0xed);
|
||||
|
||||
/*
|
||||
* Probe for ioperm support. Note that clearing ioperm bits
|
||||
* works even as nonroot.
|
||||
*/
|
||||
printf("[RUN]\tenable 0x80\n");
|
||||
if (ioperm(0x80, 1, 1) != 0) {
|
||||
printf("[OK]\tioperm(0x80, 1, 1) failed (%d) -- try running as root\n",
|
||||
errno);
|
||||
return 0;
|
||||
}
|
||||
expect_ok(0x80);
|
||||
expect_gp(0xed);
|
||||
|
||||
printf("[RUN]\tdisable 0x80\n");
|
||||
if (ioperm(0x80, 1, 0) != 0) {
|
||||
printf("[FAIL]\tioperm(0x80, 1, 0) failed (%d)", errno);
|
||||
return 1;
|
||||
}
|
||||
expect_gp(0x80);
|
||||
expect_gp(0xed);
|
||||
|
||||
/* Make sure that fork() preserves ioperm. */
|
||||
if (ioperm(0x80, 1, 1) != 0) {
|
||||
printf("[FAIL]\tioperm(0x80, 1, 0) failed (%d)", errno);
|
||||
return 1;
|
||||
}
|
||||
|
||||
pid_t child = fork();
|
||||
if (child == -1)
|
||||
err(1, "fork");
|
||||
|
||||
if (child == 0) {
|
||||
printf("[RUN]\tchild: check that we inherited permissions\n");
|
||||
expect_ok(0x80);
|
||||
expect_gp(0xed);
|
||||
return 0;
|
||||
} else {
|
||||
int status;
|
||||
if (waitpid(child, &status, 0) != child ||
|
||||
!WIFEXITED(status)) {
|
||||
printf("[FAIL]\tChild died\n");
|
||||
nerrs++;
|
||||
} else if (WEXITSTATUS(status) != 0) {
|
||||
printf("[FAIL]\tChild failed\n");
|
||||
nerrs++;
|
||||
} else {
|
||||
printf("[OK]\tChild succeeded\n");
|
||||
}
|
||||
}
|
||||
|
||||
/* Test the capability checks. */
|
||||
|
||||
printf("\tDrop privileges\n");
|
||||
if (setresuid(1, 1, 1) != 0) {
|
||||
printf("[WARN]\tDropping privileges failed\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
printf("[RUN]\tdisable 0x80\n");
|
||||
if (ioperm(0x80, 1, 0) != 0) {
|
||||
printf("[FAIL]\tioperm(0x80, 1, 0) failed (%d)", errno);
|
||||
return 1;
|
||||
}
|
||||
printf("[OK]\tit worked\n");
|
||||
|
||||
printf("[RUN]\tenable 0x80 again\n");
|
||||
if (ioperm(0x80, 1, 1) == 0) {
|
||||
printf("[FAIL]\tit succeeded but should have failed.\n");
|
||||
return 1;
|
||||
}
|
||||
printf("[OK]\tit failed\n");
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -619,7 +619,7 @@ static struct kvm *kvm_create_vm(unsigned long type)
|
|||
mutex_init(&kvm->lock);
|
||||
mutex_init(&kvm->irq_lock);
|
||||
mutex_init(&kvm->slots_lock);
|
||||
atomic_set(&kvm->users_count, 1);
|
||||
refcount_set(&kvm->users_count, 1);
|
||||
INIT_LIST_HEAD(&kvm->devices);
|
||||
|
||||
r = kvm_arch_init_vm(kvm, type);
|
||||
|
|
@ -749,13 +749,13 @@ static void kvm_destroy_vm(struct kvm *kvm)
|
|||
|
||||
void kvm_get_kvm(struct kvm *kvm)
|
||||
{
|
||||
atomic_inc(&kvm->users_count);
|
||||
refcount_inc(&kvm->users_count);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kvm_get_kvm);
|
||||
|
||||
void kvm_put_kvm(struct kvm *kvm)
|
||||
{
|
||||
if (atomic_dec_and_test(&kvm->users_count))
|
||||
if (refcount_dec_and_test(&kvm->users_count))
|
||||
kvm_destroy_vm(kvm);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kvm_put_kvm);
|
||||
|
|
@ -3641,7 +3641,7 @@ static int kvm_debugfs_open(struct inode *inode, struct file *file,
|
|||
* To avoid the race between open and the removal of the debugfs
|
||||
* directory we test against the users count.
|
||||
*/
|
||||
if (!atomic_add_unless(&stat_data->kvm->users_count, 1, 0))
|
||||
if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
|
||||
return -ENOENT;
|
||||
|
||||
if (simple_attr_open(inode, file, get, set, fmt)) {
|
||||
|
|
|
|||
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