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Message-Id: <2E6A99FD-CA67-44E7-9ADB-A037CFDFB0CA@gmail.com>
Date: Mon, 15 Jul 2019 12:59:51 +0800
From: Yi Wang <up2wing@...il.com>
To: Yi Wang <wang.yi59@....com.cn>, pbonzini@...hat.com
Cc: rkrcmar@...hat.com, tglx@...utronix.de, mingo@...hat.com,
bp@...en8.de, hpa@...or.com, x86@...nel.org, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, xue.zhihong@....com.cn,
wang.liang82@....com.cn, Yi Wang <up2wing@...il.com>
Subject: Re: [PATCH] kvm: x86: ioapic and apic debug macros cleanup
Hi Paolo,
Would you help to review this patch, plz?
Many thanks.
---
Best wishes
Yi Wang
> 在 2019年7月6日，01:08，Yi Wang <wang.yi59@....com.cn> 写道：
>
> The ioapic_debug and apic_debug have been not used
> for years, and kvm tracepoints are enough for debugging,
> so remove them as Paolo suggested.
>
> However, there may be something wrong when pv evi get/put
> user, so it's better to retain some log there.
>
> Signed-off-by: Yi Wang <wang.yi59@....com.cn>
> ---
> arch/x86/kvm/ioapic.c | 15 --------
> arch/x86/kvm/lapic.c | 98 +++++----------------------------------------------
> 2 files changed, 9 insertions(+), 104 deletions(-)
>
> diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c
> index 1add1bc..d859ae8 100644
> --- a/arch/x86/kvm/ioapic.c
> +++ b/arch/x86/kvm/ioapic.c
> @@ -45,11 +45,6 @@
> #include "lapic.h"
> #include "irq.h"
>
> -#if 0
> -#define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
> -#else
> -#define ioapic_debug(fmt, arg...)
> -#endif
> static int ioapic_service(struct kvm_ioapic *vioapic, int irq,
> bool line_status);
>
> @@ -294,7 +289,6 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
> default:
> index = (ioapic->ioregsel - 0x10) >> 1;
>
> - ioapic_debug("change redir index %x val %x\n", index, val);
> if (index >= IOAPIC_NUM_PINS)
> return;
> e = &ioapic->redirtbl[index];
> @@ -343,12 +337,6 @@ static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
> entry->fields.remote_irr))
> return -1;
>
> - ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
> - "vector=%x trig_mode=%x\n",
> - entry->fields.dest_id, entry->fields.dest_mode,
> - entry->fields.delivery_mode, entry->fields.vector,
> - entry->fields.trig_mode);
> -
> irqe.dest_id = entry->fields.dest_id;
> irqe.vector = entry->fields.vector;
> irqe.dest_mode = entry->fields.dest_mode;
> @@ -515,7 +503,6 @@ static int ioapic_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
> if (!ioapic_in_range(ioapic, addr))
> return -EOPNOTSUPP;
>
> - ioapic_debug("addr %lx\n", (unsigned long)addr);
> ASSERT(!(addr & 0xf)); /* check alignment */
>
> addr &= 0xff;
> @@ -558,8 +545,6 @@ static int ioapic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
> if (!ioapic_in_range(ioapic, addr))
> return -EOPNOTSUPP;
>
> - ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
> - (void*)addr, len, val);
> ASSERT(!(addr & 0xf)); /* check alignment */
>
> switch (len) {
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 4dabc31..0f3b57e 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -52,9 +52,6 @@
> #define PRIu64 "u"
> #define PRIo64 "o"
>
> -/* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
> -#define apic_debug(fmt, arg...) do {} while (0)
> -
> /* 14 is the version for Xeon and Pentium 8.4.8*/
> #define APIC_VERSION (0x14UL | ((KVM_APIC_LVT_NUM - 1) << 16))
> #define LAPIC_MMIO_LENGTH (1 << 12)
> @@ -631,7 +628,7 @@ static bool pv_eoi_get_pending(struct kvm_vcpu *vcpu)
> {
> u8 val;
> if (pv_eoi_get_user(vcpu, &val) < 0)
> - apic_debug("Can't read EOI MSR value: 0x%llx\n",
> + printk(KERN_WARNING "Can't read EOI MSR value: 0x%llx\n",
> (unsigned long long)vcpu->arch.pv_eoi.msr_val);
> return val & 0x1;
> }
> @@ -639,7 +636,7 @@ static bool pv_eoi_get_pending(struct kvm_vcpu *vcpu)
> static void pv_eoi_set_pending(struct kvm_vcpu *vcpu)
> {
> if (pv_eoi_put_user(vcpu, KVM_PV_EOI_ENABLED) < 0) {
> - apic_debug("Can't set EOI MSR value: 0x%llx\n",
> + printk(KERN_WARNING "Can't set EOI MSR value: 0x%llx\n",
> (unsigned long long)vcpu->arch.pv_eoi.msr_val);
> return;
> }
> @@ -649,7 +646,7 @@ static void pv_eoi_set_pending(struct kvm_vcpu *vcpu)
> static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
> {
> if (pv_eoi_put_user(vcpu, KVM_PV_EOI_DISABLED) < 0) {
> - apic_debug("Can't clear EOI MSR value: 0x%llx\n",
> + printk(KERN_WARNING "Can't clear EOI MSR value: 0x%llx\n",
> (unsigned long long)vcpu->arch.pv_eoi.msr_val);
> return;
> }
> @@ -683,9 +680,6 @@ static bool __apic_update_ppr(struct kvm_lapic *apic, u32 *new_ppr)
> else
> ppr = isrv & 0xf0;
>
> - apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
> - apic, ppr, isr, isrv);
> -
> *new_ppr = ppr;
> if (old_ppr != ppr)
> kvm_lapic_set_reg(apic, APIC_PROCPRI, ppr);
> @@ -762,8 +756,6 @@ static bool kvm_apic_match_logical_addr(struct kvm_lapic *apic, u32 mda)
> return ((logical_id >> 4) == (mda >> 4))
> && (logical_id & mda & 0xf) != 0;
> default:
> - apic_debug("Bad DFR vcpu %d: %08x\n",
> - apic->vcpu->vcpu_id, kvm_lapic_get_reg(apic, APIC_DFR));
> return false;
> }
> }
> @@ -802,10 +794,6 @@ bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
> struct kvm_lapic *target = vcpu->arch.apic;
> u32 mda = kvm_apic_mda(vcpu, dest, source, target);
>
> - apic_debug("target %p, source %p, dest 0x%x, "
> - "dest_mode 0x%x, short_hand 0x%x\n",
> - target, source, dest, dest_mode, short_hand);
> -
> ASSERT(target);
> switch (short_hand) {
> case APIC_DEST_NOSHORT:
> @@ -820,8 +808,6 @@ bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
> case APIC_DEST_ALLBUT:
> return target != source;
> default:
> - apic_debug("kvm: apic: Bad dest shorthand value %x\n",
> - short_hand);
> return false;
> }
> }
> @@ -1097,15 +1083,10 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
> smp_wmb();
> kvm_make_request(KVM_REQ_EVENT, vcpu);
> kvm_vcpu_kick(vcpu);
> - } else {
> - apic_debug("Ignoring de-assert INIT to vcpu %d\n",
> - vcpu->vcpu_id);
> }
> break;
>
> case APIC_DM_STARTUP:
> - apic_debug("SIPI to vcpu %d vector 0x%02x\n",
> - vcpu->vcpu_id, vector);
> result = 1;
> apic->sipi_vector = vector;
> /* make sure sipi_vector is visible for the receiver */
> @@ -1223,14 +1204,6 @@ static void apic_send_ipi(struct kvm_lapic *apic)
>
> trace_kvm_apic_ipi(icr_low, irq.dest_id);
>
> - apic_debug("icr_high 0x%x, icr_low 0x%x, "
> - "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
> - "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x, "
> - "msi_redir_hint 0x%x\n",
> - icr_high, icr_low, irq.shorthand, irq.dest_id,
> - irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
> - irq.vector, irq.msi_redir_hint);
> -
> kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq, NULL);
> }
>
> @@ -1284,7 +1257,6 @@ static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
>
> switch (offset) {
> case APIC_ARBPRI:
> - apic_debug("Access APIC ARBPRI register which is for P6\n");
> break;
>
> case APIC_TMCCT: /* Timer CCR */
> @@ -1321,17 +1293,11 @@ int kvm_lapic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
> /* this bitmask has a bit cleared for each reserved register */
> static const u64 rmask = 0x43ff01ffffffe70cULL;
>
> - if ((alignment + len) > 4) {
> - apic_debug("KVM_APIC_READ: alignment error %x %d\n",
> - offset, len);
> + if ((alignment + len) > 4)
> return 1;
> - }
>
> - if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
> - apic_debug("KVM_APIC_READ: read reserved register %x\n",
> - offset);
> + if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4))))
> return 1;
> - }
>
> result = __apic_read(apic, offset & ~0xf);
>
> @@ -1389,9 +1355,6 @@ static void update_divide_count(struct kvm_lapic *apic)
> tmp1 = tdcr & 0xf;
> tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
> apic->divide_count = 0x1 << (tmp2 & 0x7);
> -
> - apic_debug("timer divide count is 0x%x\n",
> - apic->divide_count);
> }
>
> static void limit_periodic_timer_frequency(struct kvm_lapic *apic)
> @@ -1616,16 +1579,6 @@ static bool set_target_expiration(struct kvm_lapic *apic)
>
> limit_periodic_timer_frequency(apic);
>
> - apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
> - PRIx64 ", "
> - "timer initial count 0x%x, period %lldns, "
> - "expire @ 0x%016" PRIx64 ".\n", __func__,
> - APIC_BUS_CYCLE_NS, ktime_to_ns(now),
> - kvm_lapic_get_reg(apic, APIC_TMICT),
> - apic->lapic_timer.period,
> - ktime_to_ns(ktime_add_ns(now,
> - apic->lapic_timer.period)));
> -
> apic->lapic_timer.tscdeadline = kvm_read_l1_tsc(apic->vcpu, tscl) +
> nsec_to_cycles(apic->vcpu, apic->lapic_timer.period);
> apic->lapic_timer.target_expiration = ktime_add_ns(now, apic->lapic_timer.period);
> @@ -1828,8 +1781,6 @@ static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
> if (apic->lvt0_in_nmi_mode != lvt0_in_nmi_mode) {
> apic->lvt0_in_nmi_mode = lvt0_in_nmi_mode;
> if (lvt0_in_nmi_mode) {
> - apic_debug("Receive NMI setting on APIC_LVT0 "
> - "for cpu %d\n", apic->vcpu->vcpu_id);
> atomic_inc(&apic->vcpu->kvm->arch.vapics_in_nmi_mode);
> } else
> atomic_dec(&apic->vcpu->kvm->arch.vapics_in_nmi_mode);
> @@ -1943,8 +1894,6 @@ int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
> case APIC_TDCR: {
> uint32_t old_divisor = apic->divide_count;
>
> - if (val & 4)
> - apic_debug("KVM_WRITE:TDCR %x\n", val);
> kvm_lapic_set_reg(apic, APIC_TDCR, val);
> update_divide_count(apic);
> if (apic->divide_count != old_divisor &&
> @@ -1956,10 +1905,8 @@ int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
> break;
> }
> case APIC_ESR:
> - if (apic_x2apic_mode(apic) && val != 0) {
> - apic_debug("KVM_WRITE:ESR not zero %x\n", val);
> + if (apic_x2apic_mode(apic) && val != 0)
> ret = 1;
> - }
> break;
>
> case APIC_SELF_IPI:
> @@ -1972,8 +1919,7 @@ int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
> ret = 1;
> break;
> }
> - if (ret)
> - apic_debug("Local APIC Write to read-only register %x\n", reg);
> +
> return ret;
> }
> EXPORT_SYMBOL_GPL(kvm_lapic_reg_write);
> @@ -2001,19 +1947,11 @@ static int apic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
> * 32/64/128 bits registers must be accessed thru 32 bits.
> * Refer SDM 8.4.1
> */
> - if (len != 4 || (offset & 0xf)) {
> - /* Don't shout loud, $infamous_os would cause only noise. */
> - apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
> + if (len != 4 || (offset & 0xf))
> return 0;
> - }
>
> val = *(u32*)data;
>
> - /* too common printing */
> - if (offset != APIC_EOI)
> - apic_debug("%s: offset 0x%x with length 0x%x, and value is "
> - "0x%x\n", __func__, offset, len, val);
> -
> kvm_lapic_reg_write(apic, offset & 0xff0, val);
>
> return 0;
> @@ -2146,11 +2084,6 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
> if ((value & MSR_IA32_APICBASE_ENABLE) &&
> apic->base_address != APIC_DEFAULT_PHYS_BASE)
> pr_warn_once("APIC base relocation is unsupported by KVM");
> -
> - /* with FSB delivery interrupt, we can restart APIC functionality */
> - apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
> - "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
> -
> }
>
> void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
> @@ -2161,8 +2094,6 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
> if (!apic)
> return;
>
> - apic_debug("%s\n", __func__);
> -
> /* Stop the timer in case it's a reset to an active apic */
> hrtimer_cancel(&apic->lapic_timer.timer);
>
> @@ -2215,11 +2146,6 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
>
> vcpu->arch.apic_arb_prio = 0;
> vcpu->arch.apic_attention = 0;
> -
> - apic_debug("%s: vcpu=%p, id=0x%x, base_msr="
> - "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
> - vcpu, kvm_lapic_get_reg(apic, APIC_ID),
> - vcpu->arch.apic_base, apic->base_address);
> }
>
> /*
> @@ -2291,7 +2217,6 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu, int timer_advance_ns)
> struct kvm_lapic *apic;
>
> ASSERT(vcpu != NULL);
> - apic_debug("apic_init %d\n", vcpu->vcpu_id);
>
> apic = kzalloc(sizeof(*apic), GFP_KERNEL_ACCOUNT);
> if (!apic)
> @@ -2645,11 +2570,8 @@ int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
> if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(apic))
> return 1;
>
> - if (reg == APIC_DFR || reg == APIC_ICR2) {
> - apic_debug("KVM_APIC_READ: read x2apic reserved register %x\n",
> - reg);
> + if (reg == APIC_DFR || reg == APIC_ICR2)
> return 1;
> - }
>
> if (kvm_lapic_reg_read(apic, reg, 4, &low))
> return 1;
> @@ -2747,8 +2669,6 @@ void kvm_apic_accept_events(struct kvm_vcpu *vcpu)
> /* evaluate pending_events before reading the vector */
> smp_rmb();
> sipi_vector = apic->sipi_vector;
> - apic_debug("vcpu %d received sipi with vector # %x\n",
> - vcpu->vcpu_id, sipi_vector);
> kvm_vcpu_deliver_sipi_vector(vcpu, sipi_vector);
> vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
> }
> --
> 1.8.3.1
>
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