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![Paolo Bonzini](/assets/img/avatar_default.png)
x86 Xen-for-KVM: * Allow the Xen runstate information to cross a page boundary * Allow XEN_RUNSTATE_UPDATE flag behaviour to be configured * add support for 32-bit guests in SCHEDOP_poll x86 fixes: * One-off fixes for various emulation flows (SGX, VMXON, NRIPS=0). * Reinstate IBPB on emulated VM-Exit that was incorrectly dropped a few years back when eliminating unnecessary barriers when switching between vmcs01 and vmcs02. * Clean up the MSR filter docs. * Clean up vmread_error_trampoline() to make it more obvious that params must be passed on the stack, even for x86-64. * Let userspace set all supported bits in MSR_IA32_FEAT_CTL irrespective of the current guest CPUID. * Fudge around a race with TSC refinement that results in KVM incorrectly thinking a guest needs TSC scaling when running on a CPU with a constant TSC, but no hardware-enumerated TSC frequency. * Advertise (on AMD) that the SMM_CTL MSR is not supported * Remove unnecessary exports Selftests: * Fix an inverted check in the access tracking perf test, and restore support for asserting that there aren't too many idle pages when running on bare metal. * Fix an ordering issue in the AMX test introduced by recent conversions to use kvm_cpu_has(), and harden the code to guard against similar bugs in the future. Anything that tiggers caching of KVM's supported CPUID, kvm_cpu_has() in this case, effectively hides opt-in XSAVE features if the caching occurs before the test opts in via prctl(). * Fix build errors that occur in certain setups (unsure exactly what is unique about the problematic setup) due to glibc overriding static_assert() to a variant that requires a custom message. * Introduce actual atomics for clear/set_bit() in selftests Documentation: * Remove deleted ioctls from documentation * Various fixes
949 lines
27 KiB
C
949 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* KVM dirty page logging test
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*
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* Copyright (C) 2018, Red Hat, Inc.
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*/
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#define _GNU_SOURCE /* for program_invocation_name */
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <errno.h>
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#include <linux/bitmap.h>
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#include <linux/bitops.h>
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#include <linux/atomic.h>
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#include <asm/barrier.h>
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#include "kvm_util.h"
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#include "test_util.h"
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#include "guest_modes.h"
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#include "processor.h"
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#define DIRTY_MEM_BITS 30 /* 1G */
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#define PAGE_SHIFT_4K 12
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/* The memory slot index to track dirty pages */
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#define TEST_MEM_SLOT_INDEX 1
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/* Default guest test virtual memory offset */
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#define DEFAULT_GUEST_TEST_MEM 0xc0000000
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/* How many pages to dirty for each guest loop */
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#define TEST_PAGES_PER_LOOP 1024
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/* How many host loops to run (one KVM_GET_DIRTY_LOG for each loop) */
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#define TEST_HOST_LOOP_N 32UL
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/* Interval for each host loop (ms) */
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#define TEST_HOST_LOOP_INTERVAL 10UL
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/* Dirty bitmaps are always little endian, so we need to swap on big endian */
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#if defined(__s390x__)
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# define BITOP_LE_SWIZZLE ((BITS_PER_LONG-1) & ~0x7)
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# define test_bit_le(nr, addr) \
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test_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
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# define __set_bit_le(nr, addr) \
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__set_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
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# define __clear_bit_le(nr, addr) \
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__clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
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# define __test_and_set_bit_le(nr, addr) \
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__test_and_set_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
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# define __test_and_clear_bit_le(nr, addr) \
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__test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr)
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#else
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# define test_bit_le test_bit
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# define __set_bit_le __set_bit
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# define __clear_bit_le __clear_bit
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# define __test_and_set_bit_le __test_and_set_bit
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# define __test_and_clear_bit_le __test_and_clear_bit
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#endif
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#define TEST_DIRTY_RING_COUNT 65536
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#define SIG_IPI SIGUSR1
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/*
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* Guest/Host shared variables. Ensure addr_gva2hva() and/or
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* sync_global_to/from_guest() are used when accessing from
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* the host. READ/WRITE_ONCE() should also be used with anything
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* that may change.
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*/
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static uint64_t host_page_size;
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static uint64_t guest_page_size;
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static uint64_t guest_num_pages;
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static uint64_t random_array[TEST_PAGES_PER_LOOP];
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static uint64_t iteration;
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/*
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* Guest physical memory offset of the testing memory slot.
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* This will be set to the topmost valid physical address minus
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* the test memory size.
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*/
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static uint64_t guest_test_phys_mem;
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/*
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* Guest virtual memory offset of the testing memory slot.
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* Must not conflict with identity mapped test code.
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*/
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static uint64_t guest_test_virt_mem = DEFAULT_GUEST_TEST_MEM;
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/*
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* Continuously write to the first 8 bytes of a random pages within
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* the testing memory region.
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*/
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static void guest_code(void)
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{
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uint64_t addr;
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int i;
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/*
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* On s390x, all pages of a 1M segment are initially marked as dirty
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* when a page of the segment is written to for the very first time.
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* To compensate this specialty in this test, we need to touch all
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* pages during the first iteration.
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*/
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for (i = 0; i < guest_num_pages; i++) {
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addr = guest_test_virt_mem + i * guest_page_size;
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*(uint64_t *)addr = READ_ONCE(iteration);
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}
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while (true) {
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for (i = 0; i < TEST_PAGES_PER_LOOP; i++) {
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addr = guest_test_virt_mem;
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addr += (READ_ONCE(random_array[i]) % guest_num_pages)
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* guest_page_size;
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addr = align_down(addr, host_page_size);
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*(uint64_t *)addr = READ_ONCE(iteration);
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}
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/* Tell the host that we need more random numbers */
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GUEST_SYNC(1);
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}
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}
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/* Host variables */
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static bool host_quit;
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/* Points to the test VM memory region on which we track dirty logs */
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static void *host_test_mem;
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static uint64_t host_num_pages;
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/* For statistics only */
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static uint64_t host_dirty_count;
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static uint64_t host_clear_count;
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static uint64_t host_track_next_count;
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/* Whether dirty ring reset is requested, or finished */
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static sem_t sem_vcpu_stop;
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static sem_t sem_vcpu_cont;
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/*
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* This is only set by main thread, and only cleared by vcpu thread. It is
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* used to request vcpu thread to stop at the next GUEST_SYNC, since GUEST_SYNC
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* is the only place that we'll guarantee both "dirty bit" and "dirty data"
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* will match. E.g., SIG_IPI won't guarantee that if the vcpu is interrupted
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* after setting dirty bit but before the data is written.
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*/
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static atomic_t vcpu_sync_stop_requested;
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/*
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* This is updated by the vcpu thread to tell the host whether it's a
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* ring-full event. It should only be read until a sem_wait() of
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* sem_vcpu_stop and before vcpu continues to run.
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*/
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static bool dirty_ring_vcpu_ring_full;
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/*
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* This is only used for verifying the dirty pages. Dirty ring has a very
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* tricky case when the ring just got full, kvm will do userspace exit due to
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* ring full. When that happens, the very last PFN is set but actually the
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* data is not changed (the guest WRITE is not really applied yet), because
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* we found that the dirty ring is full, refused to continue the vcpu, and
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* recorded the dirty gfn with the old contents.
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*
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* For this specific case, it's safe to skip checking this pfn for this
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* bit, because it's a redundant bit, and when the write happens later the bit
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* will be set again. We use this variable to always keep track of the latest
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* dirty gfn we've collected, so that if a mismatch of data found later in the
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* verifying process, we let it pass.
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*/
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static uint64_t dirty_ring_last_page;
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enum log_mode_t {
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/* Only use KVM_GET_DIRTY_LOG for logging */
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LOG_MODE_DIRTY_LOG = 0,
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/* Use both KVM_[GET|CLEAR]_DIRTY_LOG for logging */
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LOG_MODE_CLEAR_LOG = 1,
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/* Use dirty ring for logging */
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LOG_MODE_DIRTY_RING = 2,
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LOG_MODE_NUM,
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/* Run all supported modes */
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LOG_MODE_ALL = LOG_MODE_NUM,
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};
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/* Mode of logging to test. Default is to run all supported modes */
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static enum log_mode_t host_log_mode_option = LOG_MODE_ALL;
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/* Logging mode for current run */
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static enum log_mode_t host_log_mode;
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static pthread_t vcpu_thread;
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static uint32_t test_dirty_ring_count = TEST_DIRTY_RING_COUNT;
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static void vcpu_kick(void)
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{
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pthread_kill(vcpu_thread, SIG_IPI);
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}
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/*
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* In our test we do signal tricks, let's use a better version of
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* sem_wait to avoid signal interrupts
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*/
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static void sem_wait_until(sem_t *sem)
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{
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int ret;
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do
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ret = sem_wait(sem);
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while (ret == -1 && errno == EINTR);
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}
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static bool clear_log_supported(void)
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{
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return kvm_has_cap(KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2);
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}
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static void clear_log_create_vm_done(struct kvm_vm *vm)
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{
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u64 manual_caps;
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manual_caps = kvm_check_cap(KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2);
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TEST_ASSERT(manual_caps, "MANUAL_CAPS is zero!");
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manual_caps &= (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE |
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KVM_DIRTY_LOG_INITIALLY_SET);
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vm_enable_cap(vm, KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2, manual_caps);
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}
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static void dirty_log_collect_dirty_pages(struct kvm_vcpu *vcpu, int slot,
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void *bitmap, uint32_t num_pages,
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uint32_t *unused)
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{
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kvm_vm_get_dirty_log(vcpu->vm, slot, bitmap);
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}
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static void clear_log_collect_dirty_pages(struct kvm_vcpu *vcpu, int slot,
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void *bitmap, uint32_t num_pages,
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uint32_t *unused)
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{
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kvm_vm_get_dirty_log(vcpu->vm, slot, bitmap);
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kvm_vm_clear_dirty_log(vcpu->vm, slot, bitmap, 0, num_pages);
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}
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/* Should only be called after a GUEST_SYNC */
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static void vcpu_handle_sync_stop(void)
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{
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if (atomic_read(&vcpu_sync_stop_requested)) {
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/* It means main thread is sleeping waiting */
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atomic_set(&vcpu_sync_stop_requested, false);
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sem_post(&sem_vcpu_stop);
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sem_wait_until(&sem_vcpu_cont);
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}
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}
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static void default_after_vcpu_run(struct kvm_vcpu *vcpu, int ret, int err)
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{
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struct kvm_run *run = vcpu->run;
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TEST_ASSERT(ret == 0 || (ret == -1 && err == EINTR),
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"vcpu run failed: errno=%d", err);
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TEST_ASSERT(get_ucall(vcpu, NULL) == UCALL_SYNC,
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"Invalid guest sync status: exit_reason=%s\n",
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exit_reason_str(run->exit_reason));
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vcpu_handle_sync_stop();
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}
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static bool dirty_ring_supported(void)
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{
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return (kvm_has_cap(KVM_CAP_DIRTY_LOG_RING) ||
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kvm_has_cap(KVM_CAP_DIRTY_LOG_RING_ACQ_REL));
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}
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static void dirty_ring_create_vm_done(struct kvm_vm *vm)
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{
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uint64_t pages;
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uint32_t limit;
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/*
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* We rely on vcpu exit due to full dirty ring state. Adjust
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* the ring buffer size to ensure we're able to reach the
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* full dirty ring state.
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*/
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pages = (1ul << (DIRTY_MEM_BITS - vm->page_shift)) + 3;
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pages = vm_adjust_num_guest_pages(vm->mode, pages);
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if (vm->page_size < getpagesize())
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pages = vm_num_host_pages(vm->mode, pages);
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limit = 1 << (31 - __builtin_clz(pages));
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test_dirty_ring_count = 1 << (31 - __builtin_clz(test_dirty_ring_count));
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test_dirty_ring_count = min(limit, test_dirty_ring_count);
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pr_info("dirty ring count: 0x%x\n", test_dirty_ring_count);
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/*
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* Switch to dirty ring mode after VM creation but before any
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* of the vcpu creation.
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*/
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vm_enable_dirty_ring(vm, test_dirty_ring_count *
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sizeof(struct kvm_dirty_gfn));
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}
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static inline bool dirty_gfn_is_dirtied(struct kvm_dirty_gfn *gfn)
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{
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return smp_load_acquire(&gfn->flags) == KVM_DIRTY_GFN_F_DIRTY;
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}
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static inline void dirty_gfn_set_collected(struct kvm_dirty_gfn *gfn)
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{
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smp_store_release(&gfn->flags, KVM_DIRTY_GFN_F_RESET);
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}
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static uint32_t dirty_ring_collect_one(struct kvm_dirty_gfn *dirty_gfns,
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int slot, void *bitmap,
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uint32_t num_pages, uint32_t *fetch_index)
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{
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struct kvm_dirty_gfn *cur;
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uint32_t count = 0;
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while (true) {
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cur = &dirty_gfns[*fetch_index % test_dirty_ring_count];
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if (!dirty_gfn_is_dirtied(cur))
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break;
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TEST_ASSERT(cur->slot == slot, "Slot number didn't match: "
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"%u != %u", cur->slot, slot);
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TEST_ASSERT(cur->offset < num_pages, "Offset overflow: "
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"0x%llx >= 0x%x", cur->offset, num_pages);
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//pr_info("fetch 0x%x page %llu\n", *fetch_index, cur->offset);
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__set_bit_le(cur->offset, bitmap);
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dirty_ring_last_page = cur->offset;
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dirty_gfn_set_collected(cur);
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(*fetch_index)++;
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count++;
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}
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return count;
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}
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static void dirty_ring_wait_vcpu(void)
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{
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/* This makes sure that hardware PML cache flushed */
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vcpu_kick();
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sem_wait_until(&sem_vcpu_stop);
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}
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static void dirty_ring_continue_vcpu(void)
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{
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pr_info("Notifying vcpu to continue\n");
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sem_post(&sem_vcpu_cont);
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}
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static void dirty_ring_collect_dirty_pages(struct kvm_vcpu *vcpu, int slot,
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void *bitmap, uint32_t num_pages,
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uint32_t *ring_buf_idx)
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{
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uint32_t count = 0, cleared;
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bool continued_vcpu = false;
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dirty_ring_wait_vcpu();
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if (!dirty_ring_vcpu_ring_full) {
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/*
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* This is not a ring-full event, it's safe to allow
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* vcpu to continue
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*/
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dirty_ring_continue_vcpu();
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continued_vcpu = true;
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}
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/* Only have one vcpu */
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count = dirty_ring_collect_one(vcpu_map_dirty_ring(vcpu),
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slot, bitmap, num_pages,
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ring_buf_idx);
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cleared = kvm_vm_reset_dirty_ring(vcpu->vm);
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/* Cleared pages should be the same as collected */
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TEST_ASSERT(cleared == count, "Reset dirty pages (%u) mismatch "
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"with collected (%u)", cleared, count);
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if (!continued_vcpu) {
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TEST_ASSERT(dirty_ring_vcpu_ring_full,
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"Didn't continue vcpu even without ring full");
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dirty_ring_continue_vcpu();
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}
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pr_info("Iteration %ld collected %u pages\n", iteration, count);
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}
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static void dirty_ring_after_vcpu_run(struct kvm_vcpu *vcpu, int ret, int err)
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{
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struct kvm_run *run = vcpu->run;
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/* A ucall-sync or ring-full event is allowed */
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if (get_ucall(vcpu, NULL) == UCALL_SYNC) {
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/* We should allow this to continue */
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;
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} else if (run->exit_reason == KVM_EXIT_DIRTY_RING_FULL ||
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(ret == -1 && err == EINTR)) {
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/* Update the flag first before pause */
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WRITE_ONCE(dirty_ring_vcpu_ring_full,
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run->exit_reason == KVM_EXIT_DIRTY_RING_FULL);
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sem_post(&sem_vcpu_stop);
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pr_info("vcpu stops because %s...\n",
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dirty_ring_vcpu_ring_full ?
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"dirty ring is full" : "vcpu is kicked out");
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sem_wait_until(&sem_vcpu_cont);
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pr_info("vcpu continues now.\n");
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} else {
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TEST_ASSERT(false, "Invalid guest sync status: "
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"exit_reason=%s\n",
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exit_reason_str(run->exit_reason));
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}
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}
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static void dirty_ring_before_vcpu_join(void)
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{
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/* Kick another round of vcpu just to make sure it will quit */
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sem_post(&sem_vcpu_cont);
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}
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struct log_mode {
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const char *name;
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/* Return true if this mode is supported, otherwise false */
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bool (*supported)(void);
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/* Hook when the vm creation is done (before vcpu creation) */
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void (*create_vm_done)(struct kvm_vm *vm);
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/* Hook to collect the dirty pages into the bitmap provided */
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void (*collect_dirty_pages) (struct kvm_vcpu *vcpu, int slot,
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void *bitmap, uint32_t num_pages,
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uint32_t *ring_buf_idx);
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/* Hook to call when after each vcpu run */
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void (*after_vcpu_run)(struct kvm_vcpu *vcpu, int ret, int err);
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void (*before_vcpu_join) (void);
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} log_modes[LOG_MODE_NUM] = {
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{
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.name = "dirty-log",
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.collect_dirty_pages = dirty_log_collect_dirty_pages,
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.after_vcpu_run = default_after_vcpu_run,
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},
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{
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.name = "clear-log",
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.supported = clear_log_supported,
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.create_vm_done = clear_log_create_vm_done,
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.collect_dirty_pages = clear_log_collect_dirty_pages,
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.after_vcpu_run = default_after_vcpu_run,
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},
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{
|
|
.name = "dirty-ring",
|
|
.supported = dirty_ring_supported,
|
|
.create_vm_done = dirty_ring_create_vm_done,
|
|
.collect_dirty_pages = dirty_ring_collect_dirty_pages,
|
|
.before_vcpu_join = dirty_ring_before_vcpu_join,
|
|
.after_vcpu_run = dirty_ring_after_vcpu_run,
|
|
},
|
|
};
|
|
|
|
/*
|
|
* We use this bitmap to track some pages that should have its dirty
|
|
* bit set in the _next_ iteration. For example, if we detected the
|
|
* page value changed to current iteration but at the same time the
|
|
* page bit is cleared in the latest bitmap, then the system must
|
|
* report that write in the next get dirty log call.
|
|
*/
|
|
static unsigned long *host_bmap_track;
|
|
|
|
static void log_modes_dump(void)
|
|
{
|
|
int i;
|
|
|
|
printf("all");
|
|
for (i = 0; i < LOG_MODE_NUM; i++)
|
|
printf(", %s", log_modes[i].name);
|
|
printf("\n");
|
|
}
|
|
|
|
static bool log_mode_supported(void)
|
|
{
|
|
struct log_mode *mode = &log_modes[host_log_mode];
|
|
|
|
if (mode->supported)
|
|
return mode->supported();
|
|
|
|
return true;
|
|
}
|
|
|
|
static void log_mode_create_vm_done(struct kvm_vm *vm)
|
|
{
|
|
struct log_mode *mode = &log_modes[host_log_mode];
|
|
|
|
if (mode->create_vm_done)
|
|
mode->create_vm_done(vm);
|
|
}
|
|
|
|
static void log_mode_collect_dirty_pages(struct kvm_vcpu *vcpu, int slot,
|
|
void *bitmap, uint32_t num_pages,
|
|
uint32_t *ring_buf_idx)
|
|
{
|
|
struct log_mode *mode = &log_modes[host_log_mode];
|
|
|
|
TEST_ASSERT(mode->collect_dirty_pages != NULL,
|
|
"collect_dirty_pages() is required for any log mode!");
|
|
mode->collect_dirty_pages(vcpu, slot, bitmap, num_pages, ring_buf_idx);
|
|
}
|
|
|
|
static void log_mode_after_vcpu_run(struct kvm_vcpu *vcpu, int ret, int err)
|
|
{
|
|
struct log_mode *mode = &log_modes[host_log_mode];
|
|
|
|
if (mode->after_vcpu_run)
|
|
mode->after_vcpu_run(vcpu, ret, err);
|
|
}
|
|
|
|
static void log_mode_before_vcpu_join(void)
|
|
{
|
|
struct log_mode *mode = &log_modes[host_log_mode];
|
|
|
|
if (mode->before_vcpu_join)
|
|
mode->before_vcpu_join();
|
|
}
|
|
|
|
static void generate_random_array(uint64_t *guest_array, uint64_t size)
|
|
{
|
|
uint64_t i;
|
|
|
|
for (i = 0; i < size; i++)
|
|
guest_array[i] = random();
|
|
}
|
|
|
|
static void *vcpu_worker(void *data)
|
|
{
|
|
int ret;
|
|
struct kvm_vcpu *vcpu = data;
|
|
struct kvm_vm *vm = vcpu->vm;
|
|
uint64_t *guest_array;
|
|
uint64_t pages_count = 0;
|
|
struct kvm_signal_mask *sigmask = alloca(offsetof(struct kvm_signal_mask, sigset)
|
|
+ sizeof(sigset_t));
|
|
sigset_t *sigset = (sigset_t *) &sigmask->sigset;
|
|
|
|
/*
|
|
* SIG_IPI is unblocked atomically while in KVM_RUN. It causes the
|
|
* ioctl to return with -EINTR, but it is still pending and we need
|
|
* to accept it with the sigwait.
|
|
*/
|
|
sigmask->len = 8;
|
|
pthread_sigmask(0, NULL, sigset);
|
|
sigdelset(sigset, SIG_IPI);
|
|
vcpu_ioctl(vcpu, KVM_SET_SIGNAL_MASK, sigmask);
|
|
|
|
sigemptyset(sigset);
|
|
sigaddset(sigset, SIG_IPI);
|
|
|
|
guest_array = addr_gva2hva(vm, (vm_vaddr_t)random_array);
|
|
|
|
while (!READ_ONCE(host_quit)) {
|
|
/* Clear any existing kick signals */
|
|
generate_random_array(guest_array, TEST_PAGES_PER_LOOP);
|
|
pages_count += TEST_PAGES_PER_LOOP;
|
|
/* Let the guest dirty the random pages */
|
|
ret = __vcpu_run(vcpu);
|
|
if (ret == -1 && errno == EINTR) {
|
|
int sig = -1;
|
|
sigwait(sigset, &sig);
|
|
assert(sig == SIG_IPI);
|
|
}
|
|
log_mode_after_vcpu_run(vcpu, ret, errno);
|
|
}
|
|
|
|
pr_info("Dirtied %"PRIu64" pages\n", pages_count);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap)
|
|
{
|
|
uint64_t step = vm_num_host_pages(mode, 1);
|
|
uint64_t page;
|
|
uint64_t *value_ptr;
|
|
uint64_t min_iter = 0;
|
|
|
|
for (page = 0; page < host_num_pages; page += step) {
|
|
value_ptr = host_test_mem + page * host_page_size;
|
|
|
|
/* If this is a special page that we were tracking... */
|
|
if (__test_and_clear_bit_le(page, host_bmap_track)) {
|
|
host_track_next_count++;
|
|
TEST_ASSERT(test_bit_le(page, bmap),
|
|
"Page %"PRIu64" should have its dirty bit "
|
|
"set in this iteration but it is missing",
|
|
page);
|
|
}
|
|
|
|
if (__test_and_clear_bit_le(page, bmap)) {
|
|
bool matched;
|
|
|
|
host_dirty_count++;
|
|
|
|
/*
|
|
* If the bit is set, the value written onto
|
|
* the corresponding page should be either the
|
|
* previous iteration number or the current one.
|
|
*/
|
|
matched = (*value_ptr == iteration ||
|
|
*value_ptr == iteration - 1);
|
|
|
|
if (host_log_mode == LOG_MODE_DIRTY_RING && !matched) {
|
|
if (*value_ptr == iteration - 2 && min_iter <= iteration - 2) {
|
|
/*
|
|
* Short answer: this case is special
|
|
* only for dirty ring test where the
|
|
* page is the last page before a kvm
|
|
* dirty ring full in iteration N-2.
|
|
*
|
|
* Long answer: Assuming ring size R,
|
|
* one possible condition is:
|
|
*
|
|
* main thr vcpu thr
|
|
* -------- --------
|
|
* iter=1
|
|
* write 1 to page 0~(R-1)
|
|
* full, vmexit
|
|
* collect 0~(R-1)
|
|
* kick vcpu
|
|
* write 1 to (R-1)~(2R-2)
|
|
* full, vmexit
|
|
* iter=2
|
|
* collect (R-1)~(2R-2)
|
|
* kick vcpu
|
|
* write 1 to (2R-2)
|
|
* (NOTE!!! "1" cached in cpu reg)
|
|
* write 2 to (2R-1)~(3R-3)
|
|
* full, vmexit
|
|
* iter=3
|
|
* collect (2R-2)~(3R-3)
|
|
* (here if we read value on page
|
|
* "2R-2" is 1, while iter=3!!!)
|
|
*
|
|
* This however can only happen once per iteration.
|
|
*/
|
|
min_iter = iteration - 1;
|
|
continue;
|
|
} else if (page == dirty_ring_last_page) {
|
|
/*
|
|
* Please refer to comments in
|
|
* dirty_ring_last_page.
|
|
*/
|
|
continue;
|
|
}
|
|
}
|
|
|
|
TEST_ASSERT(matched,
|
|
"Set page %"PRIu64" value %"PRIu64
|
|
" incorrect (iteration=%"PRIu64")",
|
|
page, *value_ptr, iteration);
|
|
} else {
|
|
host_clear_count++;
|
|
/*
|
|
* If cleared, the value written can be any
|
|
* value smaller or equals to the iteration
|
|
* number. Note that the value can be exactly
|
|
* (iteration-1) if that write can happen
|
|
* like this:
|
|
*
|
|
* (1) increase loop count to "iteration-1"
|
|
* (2) write to page P happens (with value
|
|
* "iteration-1")
|
|
* (3) get dirty log for "iteration-1"; we'll
|
|
* see that page P bit is set (dirtied),
|
|
* and not set the bit in host_bmap_track
|
|
* (4) increase loop count to "iteration"
|
|
* (which is current iteration)
|
|
* (5) get dirty log for current iteration,
|
|
* we'll see that page P is cleared, with
|
|
* value "iteration-1".
|
|
*/
|
|
TEST_ASSERT(*value_ptr <= iteration,
|
|
"Clear page %"PRIu64" value %"PRIu64
|
|
" incorrect (iteration=%"PRIu64")",
|
|
page, *value_ptr, iteration);
|
|
if (*value_ptr == iteration) {
|
|
/*
|
|
* This page is _just_ modified; it
|
|
* should report its dirtyness in the
|
|
* next run
|
|
*/
|
|
__set_bit_le(page, host_bmap_track);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct kvm_vm *create_vm(enum vm_guest_mode mode, struct kvm_vcpu **vcpu,
|
|
uint64_t extra_mem_pages, void *guest_code)
|
|
{
|
|
struct kvm_vm *vm;
|
|
|
|
pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode));
|
|
|
|
vm = __vm_create(mode, 1, extra_mem_pages);
|
|
|
|
log_mode_create_vm_done(vm);
|
|
*vcpu = vm_vcpu_add(vm, 0, guest_code);
|
|
return vm;
|
|
}
|
|
|
|
struct test_params {
|
|
unsigned long iterations;
|
|
unsigned long interval;
|
|
uint64_t phys_offset;
|
|
};
|
|
|
|
static void run_test(enum vm_guest_mode mode, void *arg)
|
|
{
|
|
struct test_params *p = arg;
|
|
struct kvm_vcpu *vcpu;
|
|
struct kvm_vm *vm;
|
|
unsigned long *bmap;
|
|
uint32_t ring_buf_idx = 0;
|
|
|
|
if (!log_mode_supported()) {
|
|
print_skip("Log mode '%s' not supported",
|
|
log_modes[host_log_mode].name);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We reserve page table for 2 times of extra dirty mem which
|
|
* will definitely cover the original (1G+) test range. Here
|
|
* we do the calculation with 4K page size which is the
|
|
* smallest so the page number will be enough for all archs
|
|
* (e.g., 64K page size guest will need even less memory for
|
|
* page tables).
|
|
*/
|
|
vm = create_vm(mode, &vcpu,
|
|
2ul << (DIRTY_MEM_BITS - PAGE_SHIFT_4K), guest_code);
|
|
|
|
guest_page_size = vm->page_size;
|
|
/*
|
|
* A little more than 1G of guest page sized pages. Cover the
|
|
* case where the size is not aligned to 64 pages.
|
|
*/
|
|
guest_num_pages = (1ul << (DIRTY_MEM_BITS - vm->page_shift)) + 3;
|
|
guest_num_pages = vm_adjust_num_guest_pages(mode, guest_num_pages);
|
|
|
|
host_page_size = getpagesize();
|
|
host_num_pages = vm_num_host_pages(mode, guest_num_pages);
|
|
|
|
if (!p->phys_offset) {
|
|
guest_test_phys_mem = (vm->max_gfn - guest_num_pages) *
|
|
guest_page_size;
|
|
guest_test_phys_mem = align_down(guest_test_phys_mem, host_page_size);
|
|
} else {
|
|
guest_test_phys_mem = p->phys_offset;
|
|
}
|
|
|
|
#ifdef __s390x__
|
|
/* Align to 1M (segment size) */
|
|
guest_test_phys_mem = align_down(guest_test_phys_mem, 1 << 20);
|
|
#endif
|
|
|
|
pr_info("guest physical test memory offset: 0x%lx\n", guest_test_phys_mem);
|
|
|
|
bmap = bitmap_zalloc(host_num_pages);
|
|
host_bmap_track = bitmap_zalloc(host_num_pages);
|
|
|
|
/* Add an extra memory slot for testing dirty logging */
|
|
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
|
|
guest_test_phys_mem,
|
|
TEST_MEM_SLOT_INDEX,
|
|
guest_num_pages,
|
|
KVM_MEM_LOG_DIRTY_PAGES);
|
|
|
|
/* Do mapping for the dirty track memory slot */
|
|
virt_map(vm, guest_test_virt_mem, guest_test_phys_mem, guest_num_pages);
|
|
|
|
/* Cache the HVA pointer of the region */
|
|
host_test_mem = addr_gpa2hva(vm, (vm_paddr_t)guest_test_phys_mem);
|
|
|
|
/* Export the shared variables to the guest */
|
|
sync_global_to_guest(vm, host_page_size);
|
|
sync_global_to_guest(vm, guest_page_size);
|
|
sync_global_to_guest(vm, guest_test_virt_mem);
|
|
sync_global_to_guest(vm, guest_num_pages);
|
|
|
|
/* Start the iterations */
|
|
iteration = 1;
|
|
sync_global_to_guest(vm, iteration);
|
|
host_quit = false;
|
|
host_dirty_count = 0;
|
|
host_clear_count = 0;
|
|
host_track_next_count = 0;
|
|
WRITE_ONCE(dirty_ring_vcpu_ring_full, false);
|
|
|
|
pthread_create(&vcpu_thread, NULL, vcpu_worker, vcpu);
|
|
|
|
while (iteration < p->iterations) {
|
|
/* Give the vcpu thread some time to dirty some pages */
|
|
usleep(p->interval * 1000);
|
|
log_mode_collect_dirty_pages(vcpu, TEST_MEM_SLOT_INDEX,
|
|
bmap, host_num_pages,
|
|
&ring_buf_idx);
|
|
|
|
/*
|
|
* See vcpu_sync_stop_requested definition for details on why
|
|
* we need to stop vcpu when verify data.
|
|
*/
|
|
atomic_set(&vcpu_sync_stop_requested, true);
|
|
sem_wait_until(&sem_vcpu_stop);
|
|
/*
|
|
* NOTE: for dirty ring, it's possible that we didn't stop at
|
|
* GUEST_SYNC but instead we stopped because ring is full;
|
|
* that's okay too because ring full means we're only missing
|
|
* the flush of the last page, and since we handle the last
|
|
* page specially verification will succeed anyway.
|
|
*/
|
|
assert(host_log_mode == LOG_MODE_DIRTY_RING ||
|
|
atomic_read(&vcpu_sync_stop_requested) == false);
|
|
vm_dirty_log_verify(mode, bmap);
|
|
sem_post(&sem_vcpu_cont);
|
|
|
|
iteration++;
|
|
sync_global_to_guest(vm, iteration);
|
|
}
|
|
|
|
/* Tell the vcpu thread to quit */
|
|
host_quit = true;
|
|
log_mode_before_vcpu_join();
|
|
pthread_join(vcpu_thread, NULL);
|
|
|
|
pr_info("Total bits checked: dirty (%"PRIu64"), clear (%"PRIu64"), "
|
|
"track_next (%"PRIu64")\n", host_dirty_count, host_clear_count,
|
|
host_track_next_count);
|
|
|
|
free(bmap);
|
|
free(host_bmap_track);
|
|
kvm_vm_free(vm);
|
|
}
|
|
|
|
static void help(char *name)
|
|
{
|
|
puts("");
|
|
printf("usage: %s [-h] [-i iterations] [-I interval] "
|
|
"[-p offset] [-m mode]\n", name);
|
|
puts("");
|
|
printf(" -c: hint to dirty ring size, in number of entries\n");
|
|
printf(" (only useful for dirty-ring test; default: %"PRIu32")\n",
|
|
TEST_DIRTY_RING_COUNT);
|
|
printf(" -i: specify iteration counts (default: %"PRIu64")\n",
|
|
TEST_HOST_LOOP_N);
|
|
printf(" -I: specify interval in ms (default: %"PRIu64" ms)\n",
|
|
TEST_HOST_LOOP_INTERVAL);
|
|
printf(" -p: specify guest physical test memory offset\n"
|
|
" Warning: a low offset can conflict with the loaded test code.\n");
|
|
printf(" -M: specify the host logging mode "
|
|
"(default: run all log modes). Supported modes: \n\t");
|
|
log_modes_dump();
|
|
guest_modes_help();
|
|
puts("");
|
|
exit(0);
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct test_params p = {
|
|
.iterations = TEST_HOST_LOOP_N,
|
|
.interval = TEST_HOST_LOOP_INTERVAL,
|
|
};
|
|
int opt, i;
|
|
sigset_t sigset;
|
|
|
|
sem_init(&sem_vcpu_stop, 0, 0);
|
|
sem_init(&sem_vcpu_cont, 0, 0);
|
|
|
|
guest_modes_append_default();
|
|
|
|
while ((opt = getopt(argc, argv, "c:hi:I:p:m:M:")) != -1) {
|
|
switch (opt) {
|
|
case 'c':
|
|
test_dirty_ring_count = strtol(optarg, NULL, 10);
|
|
break;
|
|
case 'i':
|
|
p.iterations = strtol(optarg, NULL, 10);
|
|
break;
|
|
case 'I':
|
|
p.interval = strtol(optarg, NULL, 10);
|
|
break;
|
|
case 'p':
|
|
p.phys_offset = strtoull(optarg, NULL, 0);
|
|
break;
|
|
case 'm':
|
|
guest_modes_cmdline(optarg);
|
|
break;
|
|
case 'M':
|
|
if (!strcmp(optarg, "all")) {
|
|
host_log_mode_option = LOG_MODE_ALL;
|
|
break;
|
|
}
|
|
for (i = 0; i < LOG_MODE_NUM; i++) {
|
|
if (!strcmp(optarg, log_modes[i].name)) {
|
|
pr_info("Setting log mode to: '%s'\n",
|
|
optarg);
|
|
host_log_mode_option = i;
|
|
break;
|
|
}
|
|
}
|
|
if (i == LOG_MODE_NUM) {
|
|
printf("Log mode '%s' invalid. Please choose "
|
|
"from: ", optarg);
|
|
log_modes_dump();
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'h':
|
|
default:
|
|
help(argv[0]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
TEST_ASSERT(p.iterations > 2, "Iterations must be greater than two");
|
|
TEST_ASSERT(p.interval > 0, "Interval must be greater than zero");
|
|
|
|
pr_info("Test iterations: %"PRIu64", interval: %"PRIu64" (ms)\n",
|
|
p.iterations, p.interval);
|
|
|
|
srandom(time(0));
|
|
|
|
/* Ensure that vCPU threads start with SIG_IPI blocked. */
|
|
sigemptyset(&sigset);
|
|
sigaddset(&sigset, SIG_IPI);
|
|
pthread_sigmask(SIG_BLOCK, &sigset, NULL);
|
|
|
|
if (host_log_mode_option == LOG_MODE_ALL) {
|
|
/* Run each log mode */
|
|
for (i = 0; i < LOG_MODE_NUM; i++) {
|
|
pr_info("Testing Log Mode '%s'\n", log_modes[i].name);
|
|
host_log_mode = i;
|
|
for_each_guest_mode(run_test, &p);
|
|
}
|
|
} else {
|
|
host_log_mode = host_log_mode_option;
|
|
for_each_guest_mode(run_test, &p);
|
|
}
|
|
|
|
return 0;
|
|
}
|