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Commit bd80158a authored by Jan Kiszka's avatar Jan Kiszka Committed by Avi Kivity
Browse files

KVM: Clean up and extend rate-limited output 



The use of printk_ratelimit is discouraged, replace it with
pr*_ratelimited or __ratelimit. While at it, convert remaining
guest-triggerable printks to rate-limited variants.

Signed-off-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 7712de87

arch/x86/kvm/i8259.c

+8 −7
Original line number Diff line number Diff line
@@ -34,6 +34,9 @@ 
#include <linux/kvm_host.h>

#include "trace.h"



#define pr_pic_unimpl(fmt, ...)	\

	pr_err_ratelimited("kvm: pic: " fmt, ## __VA_ARGS__)



static void pic_irq_request(struct kvm *kvm, int level);



static void pic_lock(struct kvm_pic *s)
@@ -306,9 +309,9 @@ static void pic_ioport_write(void *opaque, u32 addr, u32 val) 
			}

			s->init_state = 1;

			if (val & 0x02)

				printk(KERN_ERR "single mode not supported");

				pr_pic_unimpl("single mode not supported");

			if (val & 0x08)

				printk(KERN_ERR

				pr_pic_unimpl(

					"level sensitive irq not supported");

		} else if (val & 0x08) {

			if (val & 0x04)
@@ -467,8 +470,7 @@ static int picdev_write(struct kvm_pic *s, 
		return -EOPNOTSUPP;



	if (len != 1) {

		if (printk_ratelimit())

			printk(KERN_ERR "PIC: non byte write\n");

		pr_pic_unimpl("non byte write\n");

		return 0;

	}

	pic_lock(s);
@@ -496,8 +498,7 @@ static int picdev_read(struct kvm_pic *s, 
		return -EOPNOTSUPP;



	if (len != 1) {

		if (printk_ratelimit())

			printk(KERN_ERR "PIC: non byte read\n");

		pr_pic_unimpl("non byte read\n");

		return 0;

	}

	pic_lock(s);

arch/x86/kvm/mmu_audit.c

+3 −3
Original line number Diff line number Diff line
@@ -121,16 +121,16 @@ static void audit_mappings(struct kvm_vcpu *vcpu, u64 *sptep, int level) 


static void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)

{

	static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);

	unsigned long *rmapp;

	struct kvm_mmu_page *rev_sp;

	gfn_t gfn;





	rev_sp = page_header(__pa(sptep));

	gfn = kvm_mmu_page_get_gfn(rev_sp, sptep - rev_sp->spt);



	if (!gfn_to_memslot(kvm, gfn)) {

		if (!printk_ratelimit())

		if (!__ratelimit(&ratelimit_state))

			return;

		audit_printk(kvm, "no memslot for gfn %llx\n", gfn);

		audit_printk(kvm, "index %ld of sp (gfn=%llx)\n",
@@ -141,7 +141,7 @@ static void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep) 


	rmapp = gfn_to_rmap(kvm, gfn, rev_sp->role.level);

	if (!*rmapp) {

		if (!printk_ratelimit())

		if (!__ratelimit(&ratelimit_state))

			return;

		audit_printk(kvm, "no rmap for writable spte %llx\n",

			     *sptep);

arch/x86/kvm/vmx.c

+6 −7
Original line number Diff line number Diff line
@@ -2762,7 +2762,7 @@ static void enter_lmode(struct kvm_vcpu *vcpu) 


	guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);

	if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {

		printk(KERN_DEBUG "%s: tss fixup for long mode. \n",

		pr_debug_ratelimited("%s: tss fixup for long mode. \n",

				     __func__);

		vmcs_write32(GUEST_TR_AR_BYTES,

			     (guest_tr_ar & ~AR_TYPE_MASK)
@@ -5634,8 +5634,8 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu) 
		return 0;



	if (unlikely(vmx->fail)) {

		printk(KERN_INFO "%s failed vm entry %x\n",

		       __func__, vmcs_read32(VM_INSTRUCTION_ERROR));

		pr_info_ratelimited("%s failed vm entry %x\n", __func__,

				    vmcs_read32(VM_INSTRUCTION_ERROR));

		return 1;

	}
@@ -6612,9 +6612,8 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
	if (vmcs12->vm_entry_msr_load_count > 0 ||

	    vmcs12->vm_exit_msr_load_count > 0 ||

	    vmcs12->vm_exit_msr_store_count > 0) {

		if (printk_ratelimit())

			printk(KERN_WARNING

			  "%s: VMCS MSR_{LOAD,STORE} unsupported\n", __func__);

		pr_warn_ratelimited("%s: VMCS MSR_{LOAD,STORE} unsupported\n",

				    __func__);

		nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);

		return 1;

	}

include/linux/kvm_host.h

+3 −5
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/msi.h>

#include <linux/slab.h>

#include <linux/rcupdate.h>

#include <linux/ratelimit.h>

#include <asm/signal.h>



#include <linux/kvm.h>
@@ -282,11 +283,8 @@ struct kvm { 


/* The guest did something we don't support. */

#define pr_unimpl(vcpu, fmt, ...)					\

 do {									\

	if (printk_ratelimit())						\

		printk(KERN_ERR "kvm: %i: cpu%i " fmt,			\

		       current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \

 } while (0)

	pr_err_ratelimited("kvm: %i: cpu%i " fmt,			\

			   current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__)



#define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)

#define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)