From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Konrad Rzeszutek Wilk , Thomas Gleixner Subject: [PATCH 4.18 41/79] x86/KVM/VMX: Add find_msr() helper function Date: Tue, 14 Aug 2018 19:17:00 +0200 Message-Id: <20180814171338.381794965@linuxfoundation.org> In-Reply-To: <20180814171336.799314117@linuxfoundation.org> References: <20180814171336.799314117@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Konrad Rzeszutek Wilk .. to help find the MSR on either the guest or host MSR list. Signed-off-by: Konrad Rzeszutek Wilk Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/vmx.c | 31 ++++++++++++++++++------------- 1 file changed, 18 insertions(+), 13 deletions(-) --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2432,9 +2432,20 @@ static void clear_atomic_switch_msr_spec 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(stru } 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_specia 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 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);