From 40d8338d095e6117112f4d303e5d6cf776069e38 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Date: Thu, 29 Sep 2016 22:41:31 +0200 Subject: [PATCH] KVM: VMX: remove functions that enable msr intercepts MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit All intercepts are enabled at the beginning, so they can only be used if we disabled an intercept that we wanted to have enabled. This was done for TMCCT to simplify a loop that disables all x2APIC MSR intercepts, but just keeping TMCCT enabled yields better results. Signed-off-by: Radim Krčmář --- arch/x86/kvm/vmx.c | 57 ++++------------------------------------------ 1 file changed, 4 insertions(+), 53 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 7ef5898af46a..684e72d0c41b 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -4575,41 +4575,6 @@ static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, } } -static void __vmx_enable_intercept_for_msr(unsigned long *msr_bitmap, - u32 msr, int type) -{ - int f = sizeof(unsigned long); - - if (!cpu_has_vmx_msr_bitmap()) - return; - - /* - * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals - * have the write-low and read-high bitmap offsets the wrong way round. - * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. - */ - if (msr <= 0x1fff) { - if (type & MSR_TYPE_R) - /* read-low */ - __set_bit(msr, msr_bitmap + 0x000 / f); - - if (type & MSR_TYPE_W) - /* write-low */ - __set_bit(msr, msr_bitmap + 0x800 / f); - - } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { - msr &= 0x1fff; - if (type & MSR_TYPE_R) - /* read-high */ - __set_bit(msr, msr_bitmap + 0x400 / f); - - if (type & MSR_TYPE_W) - /* write-high */ - __set_bit(msr, msr_bitmap + 0xc00 / f); - - } -} - /* * If a msr is allowed by L0, we should check whether it is allowed by L1. * The corresponding bit will be cleared unless both of L0 and L1 allow it. @@ -4665,21 +4630,6 @@ static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only) msr, MSR_TYPE_R | MSR_TYPE_W); } -static void vmx_enable_intercept_msr_read_x2apic(u32 msr, bool apicv_active) -{ - if (apicv_active) { - __vmx_enable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic_apicv, - msr, MSR_TYPE_R); - __vmx_enable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic_apicv, - msr, MSR_TYPE_R); - } else { - __vmx_enable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic, - msr, MSR_TYPE_R); - __vmx_enable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic, - msr, MSR_TYPE_R); - } -} - static void vmx_disable_intercept_msr_read_x2apic(u32 msr, bool apicv_active) { if (apicv_active) { @@ -6490,11 +6440,12 @@ static __init int hardware_setup(void) /* * enable_apicv && kvm_vcpu_apicv_active() */ - for (msr = 0x800; msr <= 0x8ff; msr++) + for (msr = 0x800; msr <= 0x8ff; msr++) { + if (msr == 0x839 /* TMCCT */) + continue; vmx_disable_intercept_msr_read_x2apic(msr, true); + } - /* TMCCT */ - vmx_enable_intercept_msr_read_x2apic(0x839, true); /* TPR */ vmx_disable_intercept_msr_write_x2apic(0x808, true); /* EOI */ -- 2.30.2