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Commit ca83b4a7 authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk Committed by Thomas Gleixner
Browse files

x86/KVM/VMX: Add find_msr() helper function 



.. to help find the MSR on either the guest or host MSR list.

Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 33966dd6

arch/x86/kvm/vmx.c

+18 −13
Original line number Diff line number Diff line
@@ -2421,9 +2421,20 @@ static void clear_atomic_switch_msr_special(struct vcpu_vmx *vmx, 
	vm_exit_controls_clearbit(vmx, exit);

}



static int find_msr(struct vmx_msrs *m, unsigned int msr)

{

	unsigned int i;



	for (i = 0; i < m->nr; ++i) {

		if (m->val[i].index == msr)

			return i;

	}

	return -ENOENT;

}



static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr)

{

	unsigned i;

	int i;

	struct msr_autoload *m = &vmx->msr_autoload;



	switch (msr) {
@@ -2444,11 +2455,8 @@ static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr) 
		}

		break;

	}

	for (i = 0; i < m->guest.nr; ++i)

		if (m->guest.val[i].index == msr)

			break;



	if (i == m->guest.nr)

	i = find_msr(&m->guest, msr);

	if (i < 0)

		return;

	--m->guest.nr;

	--m->host.nr;
@@ -2472,7 +2480,7 @@ static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx, 
static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,

				  u64 guest_val, u64 host_val)

{

	unsigned i;

	int i;

	struct msr_autoload *m = &vmx->msr_autoload;



	switch (msr) {
@@ -2507,16 +2515,13 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr, 
		wrmsrl(MSR_IA32_PEBS_ENABLE, 0);

	}



	for (i = 0; i < m->guest.nr; ++i)

		if (m->guest.val[i].index == msr)

			break;



	i = find_msr(&m->guest, msr);

	if (i == NR_AUTOLOAD_MSRS) {

		printk_once(KERN_WARNING "Not enough msr switch entries. "

				"Can't add msr %x\n", msr);

		return;

	} else if (i == m->guest.nr) {

		++m->guest.nr;

	} else if (i < 0) {

		i = m->guest.nr++;

		++m->host.nr;

		vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr);

		vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr);