diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 57 |
1 files changed, 43 insertions, 14 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index b20c9e47e92..b5eae7a00aa 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -113,7 +113,8 @@ static DEFINE_PER_CPU(struct list_head, vcpus_on_cpu); static unsigned long *vmx_io_bitmap_a; static unsigned long *vmx_io_bitmap_b; -static unsigned long *vmx_msr_bitmap; +static unsigned long *vmx_msr_bitmap_legacy; +static unsigned long *vmx_msr_bitmap_longmode; static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS); static DEFINE_SPINLOCK(vmx_vpid_lock); @@ -812,6 +813,7 @@ static void move_msr_up(struct vcpu_vmx *vmx, int from, int to) static void setup_msrs(struct vcpu_vmx *vmx) { int save_nmsrs; + unsigned long *msr_bitmap; vmx_load_host_state(vmx); save_nmsrs = 0; @@ -847,6 +849,15 @@ static void setup_msrs(struct vcpu_vmx *vmx) __find_msr_index(vmx, MSR_KERNEL_GS_BASE); #endif vmx->msr_offset_efer = __find_msr_index(vmx, MSR_EFER); + + if (cpu_has_vmx_msr_bitmap()) { + if (is_long_mode(&vmx->vcpu)) + msr_bitmap = vmx_msr_bitmap_longmode; + else + msr_bitmap = vmx_msr_bitmap_legacy; + + vmcs_write64(MSR_BITMAP, __pa(msr_bitmap)); + } } /* @@ -2082,7 +2093,7 @@ static void allocate_vpid(struct vcpu_vmx *vmx) spin_unlock(&vmx_vpid_lock); } -static void vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr) +static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr) { int f = sizeof(unsigned long); @@ -2104,6 +2115,13 @@ static void vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr) } } +static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only) +{ + if (!longmode_only) + __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr); + __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr); +} + /* * Sets up the vmcs for emulated real mode. */ @@ -2123,7 +2141,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b)); if (cpu_has_vmx_msr_bitmap()) - vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap)); + vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy)); vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */ @@ -3705,12 +3723,18 @@ static int __init vmx_init(void) goto out; } - vmx_msr_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL); - if (!vmx_msr_bitmap) { + vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL); + if (!vmx_msr_bitmap_legacy) { r = -ENOMEM; goto out1; } + vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL); + if (!vmx_msr_bitmap_longmode) { + r = -ENOMEM; + goto out2; + } + /* * Allow direct access to the PC debug port (it is often used for I/O * delays, but the vmexits simply slow things down). @@ -3720,19 +3744,21 @@ static int __init vmx_init(void) memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE); - memset(vmx_msr_bitmap, 0xff, PAGE_SIZE); + memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE); + memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE); set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */ r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE); if (r) - goto out2; + goto out3; - vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_FS_BASE); - vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_GS_BASE); - vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_CS); - vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_ESP); - vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_EIP); + vmx_disable_intercept_for_msr(MSR_FS_BASE, false); + vmx_disable_intercept_for_msr(MSR_GS_BASE, false); + vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true); + vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false); + vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false); + vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false); if (vm_need_ept()) { bypass_guest_pf = 0; @@ -3752,8 +3778,10 @@ static int __init vmx_init(void) return 0; +out3: + free_page((unsigned long)vmx_msr_bitmap_longmode); out2: - free_page((unsigned long)vmx_msr_bitmap); + free_page((unsigned long)vmx_msr_bitmap_legacy); out1: free_page((unsigned long)vmx_io_bitmap_b); out: @@ -3763,7 +3791,8 @@ out: static void __exit vmx_exit(void) { - free_page((unsigned long)vmx_msr_bitmap); + free_page((unsigned long)vmx_msr_bitmap_legacy); + free_page((unsigned long)vmx_msr_bitmap_longmode); free_page((unsigned long)vmx_io_bitmap_b); free_page((unsigned long)vmx_io_bitmap_a); |