diff options
| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2018-06-20 20:11:39 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-15 17:37:29 +0200 |
| commit | 452695e55b38f04dff86e292b1140aa12ad811db (patch) | |
| tree | 492b9b44f893bb29bd69bd18bf65d9900cef3435 | |
| parent | 6cfd9bd0167a598b0d5cda1d47c06171c58e78b5 (diff) | |
| download | linux-452695e55b38f04dff86e292b1140aa12ad811db.tar.gz | |
x86/KVM/VMX: Add find_msr() helper function
commit ca83b4a7f2d068da79a029d323024aa45decb250 upstream.
.. 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/kvm/vmx.c | 31 |
1 files changed, 18 insertions, 13 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 23f00bce5c9ce..39bc807f37999 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2432,9 +2432,20 @@ 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) { @@ -2455,11 +2466,8 @@ 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; @@ -2483,7 +2491,7 @@ 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) { @@ -2518,16 +2526,13 @@ 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); |