Commit 2d62e076 authored by Linus Torvalds's avatar Linus Torvalds

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
parents be834aaf 16ce771b
......@@ -46,7 +46,7 @@ extern struct patb_entry *partition_tb;
/* Bits in patb0 field */
#define PATB_HR (1UL << 63)
#define RPDB_MASK 0x0ffffffffffff00fUL
#define RPDB_MASK 0x0fffffffffffff00UL
#define RPDB_SHIFT (1UL << 8)
#define RTS1_SHIFT 61 /* top 2 bits of radix tree size */
#define RTS1_MASK (3UL << RTS1_SHIFT)
......@@ -57,6 +57,7 @@ extern struct patb_entry *partition_tb;
/* Bits in patb1 field */
#define PATB_GR (1UL << 63) /* guest uses radix; must match HR */
#define PRTS_MASK 0x1f /* process table size field */
#define PRTB_MASK 0x0ffffffffffff000UL
/*
* Limit process table to PAGE_SIZE table. This
......
......@@ -32,6 +32,7 @@ int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
u32 pid;
int ret, level, ps;
__be64 prte, rpte;
unsigned long ptbl;
unsigned long root, pte, index;
unsigned long rts, bits, offset;
unsigned long gpa;
......@@ -53,8 +54,8 @@ int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
return -EINVAL;
/* Read partition table to find root of tree for effective PID */
ret = kvm_read_guest(kvm, kvm->arch.process_table + pid * 16,
&prte, sizeof(prte));
ptbl = (kvm->arch.process_table & PRTB_MASK) + (pid * 16);
ret = kvm_read_guest(kvm, ptbl, &prte, sizeof(prte));
if (ret)
return ret;
......
......@@ -1787,12 +1787,12 @@ kvmppc_hdsi:
/* HPTE not found fault or protection fault? */
andis. r0, r6, (DSISR_NOHPTE | DSISR_PROTFAULT)@h
beq 1f /* if not, send it to the guest */
andi. r0, r11, MSR_DR /* data relocation enabled? */
beq 3f
BEGIN_FTR_SECTION
mfspr r5, SPRN_ASDR /* on POWER9, use ASDR to get VSID */
b 4f
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
andi. r0, r11, MSR_DR /* data relocation enabled? */
beq 3f
clrrdi r0, r4, 28
PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */
li r0, BOOK3S_INTERRUPT_DATA_SEGMENT
......@@ -1879,12 +1879,12 @@ kvmppc_hisi:
bne .Lradix_hisi /* for radix, just save ASDR */
andis. r0, r11, SRR1_ISI_NOPT@h
beq 1f
andi. r0, r11, MSR_IR /* instruction relocation enabled? */
beq 3f
BEGIN_FTR_SECTION
mfspr r5, SPRN_ASDR /* on POWER9, use ASDR to get VSID */
b 4f
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
andi. r0, r11, MSR_IR /* instruction relocation enabled? */
beq 3f
clrrdi r0, r10, 28
PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */
li r0, BOOK3S_INTERRUPT_INST_SEGMENT
......
......@@ -205,6 +205,8 @@ static inline void native_load_tr_desc(void)
asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8));
}
DECLARE_PER_CPU(bool, __tss_limit_invalid);
static inline void force_reload_TR(void)
{
struct desc_struct *d = get_cpu_gdt_table(smp_processor_id());
......@@ -220,18 +222,20 @@ static inline void force_reload_TR(void)
write_gdt_entry(d, GDT_ENTRY_TSS, &tss, DESC_TSS);
load_TR_desc();
this_cpu_write(__tss_limit_invalid, false);
}
DECLARE_PER_CPU(bool, need_tr_refresh);
static inline void refresh_TR(void)
/*
* Call this if you need the TSS limit to be correct, which should be the case
* if and only if you have TIF_IO_BITMAP set or you're switching to a task
* with TIF_IO_BITMAP set.
*/
static inline void refresh_tss_limit(void)
{
DEBUG_LOCKS_WARN_ON(preemptible());
if (unlikely(this_cpu_read(need_tr_refresh))) {
if (unlikely(this_cpu_read(__tss_limit_invalid)))
force_reload_TR();
this_cpu_write(need_tr_refresh, false);
}
}
/*
......@@ -250,7 +254,7 @@ static inline void invalidate_tss_limit(void)
if (unlikely(test_thread_flag(TIF_IO_BITMAP)))
force_reload_TR();
else
this_cpu_write(need_tr_refresh, true);
this_cpu_write(__tss_limit_invalid, true);
}
static inline void native_load_gdt(const struct desc_ptr *dtr)
......
......@@ -48,8 +48,14 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
t->io_bitmap_ptr = bitmap;
set_thread_flag(TIF_IO_BITMAP);
/*
* Now that we have an IO bitmap, we need our TSS limit to be
* correct. It's fine if we are preempted after doing this:
* with TIF_IO_BITMAP set, context switches will keep our TSS
* limit correct.
*/
preempt_disable();
refresh_TR();
refresh_tss_limit();
preempt_enable();
}
......
......@@ -69,8 +69,8 @@ __visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss) = {
};
EXPORT_PER_CPU_SYMBOL(cpu_tss);
DEFINE_PER_CPU(bool, need_tr_refresh);
EXPORT_PER_CPU_SYMBOL_GPL(need_tr_refresh);
DEFINE_PER_CPU(bool, __tss_limit_invalid);
EXPORT_PER_CPU_SYMBOL_GPL(__tss_limit_invalid);
/*
* this gets called so that we can store lazy state into memory and copy the
......@@ -222,7 +222,7 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
* Make sure that the TSS limit is correct for the CPU
* to notice the IO bitmap.
*/
refresh_TR();
refresh_tss_limit();
} else if (test_tsk_thread_flag(prev_p, TIF_IO_BITMAP)) {
/*
* Clear any possible leftover bits:
......
......@@ -113,12 +113,19 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
.config = config,
};
attr.sample_period = (-pmc->counter) & pmc_bitmask(pmc);
if (in_tx)
attr.config |= HSW_IN_TX;
if (in_tx_cp)
if (in_tx_cp) {
/*
* HSW_IN_TX_CHECKPOINTED is not supported with nonzero
* period. Just clear the sample period so at least
* allocating the counter doesn't fail.
*/
attr.sample_period = 0;
attr.config |= HSW_IN_TX_CHECKPOINTED;
attr.sample_period = (-pmc->counter) & pmc_bitmask(pmc);
}
event = perf_event_create_kernel_counter(&attr, -1, current,
intr ? kvm_perf_overflow_intr :
......
......@@ -2053,7 +2053,6 @@ static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
static unsigned long segment_base(u16 selector)
{
struct desc_ptr *gdt = this_cpu_ptr(&host_gdt);
struct desc_struct *d;
struct desc_struct *table;
unsigned long v;
......@@ -10642,6 +10641,11 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (vcpu->arch.exception.pending ||
vcpu->arch.nmi_injected ||
vcpu->arch.interrupt.pending)
return -EBUSY;
if (nested_cpu_has_preemption_timer(get_vmcs12(vcpu)) &&
vmx->nested.preemption_timer_expired) {
if (vmx->nested.nested_run_pending)
......@@ -10651,8 +10655,7 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
}
if (vcpu->arch.nmi_pending && nested_exit_on_nmi(vcpu)) {
if (vmx->nested.nested_run_pending ||
vcpu->arch.interrupt.pending)
if (vmx->nested.nested_run_pending)
return -EBUSY;
nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
NMI_VECTOR | INTR_TYPE_NMI_INTR |
......
......@@ -26,6 +26,7 @@
#include <linux/context_tracking.h>
#include <linux/irqbypass.h>
#include <linux/swait.h>
#include <linux/refcount.h>
#include <asm/signal.h>
#include <linux/kvm.h>
......@@ -401,7 +402,7 @@ struct kvm {
#endif
struct kvm_vm_stat stat;
struct kvm_arch arch;
atomic_t users_count;
refcount_t users_count;
#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
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 \
check_initial_reg_state sigreturn ldt_gdt iopl mpx-mini-test \
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 \
......
/*
* 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)) {
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment