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

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

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Konrad Rzeszutek Wilk 2018-06-20 20:11:39 -04:00 committed by Thomas Gleixner
parent 33966dd6b2
commit ca83b4a7f2
1 changed files with 18 additions and 13 deletions
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31
arch/x86/kvm/vmx.c
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@ -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);