summaryrefslogtreecommitdiff
path: root/arch/x86/kvm/vmx.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kvm/vmx.c')
-rw-r--r--arch/x86/kvm/vmx.c209
1 files changed, 165 insertions, 44 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 32eb58866292..c00f03de1b79 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -71,7 +71,10 @@ static bool __read_mostly enable_unrestricted_guest = 1;
module_param_named(unrestricted_guest,
enable_unrestricted_guest, bool, S_IRUGO);
-static bool __read_mostly emulate_invalid_guest_state = 0;
+static bool __read_mostly enable_ept_ad_bits = 1;
+module_param_named(eptad, enable_ept_ad_bits, bool, S_IRUGO);
+
+static bool __read_mostly emulate_invalid_guest_state = true;
module_param(emulate_invalid_guest_state, bool, S_IRUGO);
static bool __read_mostly vmm_exclusive = 1;
@@ -615,6 +618,10 @@ static void kvm_cpu_vmxon(u64 addr);
static void kvm_cpu_vmxoff(void);
static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr);
+static void vmx_set_segment(struct kvm_vcpu *vcpu,
+ struct kvm_segment *var, int seg);
+static void vmx_get_segment(struct kvm_vcpu *vcpu,
+ struct kvm_segment *var, int seg);
static DEFINE_PER_CPU(struct vmcs *, vmxarea);
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
@@ -789,6 +796,11 @@ static inline bool cpu_has_vmx_ept_4levels(void)
return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT;
}
+static inline bool cpu_has_vmx_ept_ad_bits(void)
+{
+ return vmx_capability.ept & VMX_EPT_AD_BIT;
+}
+
static inline bool cpu_has_vmx_invept_individual_addr(void)
{
return vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT;
@@ -849,6 +861,12 @@ static inline bool cpu_has_vmx_rdtscp(void)
SECONDARY_EXEC_RDTSCP;
}
+static inline bool cpu_has_vmx_invpcid(void)
+{
+ return vmcs_config.cpu_based_2nd_exec_ctrl &
+ SECONDARY_EXEC_ENABLE_INVPCID;
+}
+
static inline bool cpu_has_virtual_nmis(void)
{
return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
@@ -1470,13 +1488,6 @@ static void __vmx_load_host_state(struct vcpu_vmx *vmx)
loadsegment(ds, vmx->host_state.ds_sel);
loadsegment(es, vmx->host_state.es_sel);
}
-#else
- /*
- * The sysexit path does not restore ds/es, so we must set them to
- * a reasonable value ourselves.
- */
- loadsegment(ds, __USER_DS);
- loadsegment(es, __USER_DS);
#endif
reload_tss();
#ifdef CONFIG_X86_64
@@ -1739,6 +1750,11 @@ static bool vmx_rdtscp_supported(void)
return cpu_has_vmx_rdtscp();
}
+static bool vmx_invpcid_supported(void)
+{
+ return cpu_has_vmx_invpcid() && enable_ept;
+}
+
/*
* Swap MSR entry in host/guest MSR entry array.
*/
@@ -2458,7 +2474,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
SECONDARY_EXEC_ENABLE_EPT |
SECONDARY_EXEC_UNRESTRICTED_GUEST |
SECONDARY_EXEC_PAUSE_LOOP_EXITING |
- SECONDARY_EXEC_RDTSCP;
+ SECONDARY_EXEC_RDTSCP |
+ SECONDARY_EXEC_ENABLE_INVPCID;
if (adjust_vmx_controls(min2, opt2,
MSR_IA32_VMX_PROCBASED_CTLS2,
&_cpu_based_2nd_exec_control) < 0)
@@ -2645,8 +2662,12 @@ static __init int hardware_setup(void)
!cpu_has_vmx_ept_4levels()) {
enable_ept = 0;
enable_unrestricted_guest = 0;
+ enable_ept_ad_bits = 0;
}
+ if (!cpu_has_vmx_ept_ad_bits())
+ enable_ept_ad_bits = 0;
+
if (!cpu_has_vmx_unrestricted_guest())
enable_unrestricted_guest = 0;
@@ -2770,6 +2791,7 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
{
unsigned long flags;
struct vcpu_vmx *vmx = to_vmx(vcpu);
+ struct kvm_segment var;
if (enable_unrestricted_guest)
return;
@@ -2813,20 +2835,23 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
if (emulate_invalid_guest_state)
goto continue_rmode;
- vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
- vmcs_write32(GUEST_SS_LIMIT, 0xffff);
- vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
+ vmx_get_segment(vcpu, &var, VCPU_SREG_SS);
+ vmx_set_segment(vcpu, &var, VCPU_SREG_SS);
+
+ vmx_get_segment(vcpu, &var, VCPU_SREG_CS);
+ vmx_set_segment(vcpu, &var, VCPU_SREG_CS);
- vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
- vmcs_write32(GUEST_CS_LIMIT, 0xffff);
- if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
- vmcs_writel(GUEST_CS_BASE, 0xf0000);
- vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
+ vmx_get_segment(vcpu, &var, VCPU_SREG_ES);
+ vmx_set_segment(vcpu, &var, VCPU_SREG_ES);
- fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es);
- fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds);
- fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs);
- fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs);
+ vmx_get_segment(vcpu, &var, VCPU_SREG_DS);
+ vmx_set_segment(vcpu, &var, VCPU_SREG_DS);
+
+ vmx_get_segment(vcpu, &var, VCPU_SREG_GS);
+ vmx_set_segment(vcpu, &var, VCPU_SREG_GS);
+
+ vmx_get_segment(vcpu, &var, VCPU_SREG_FS);
+ vmx_set_segment(vcpu, &var, VCPU_SREG_FS);
continue_rmode:
kvm_mmu_reset_context(vcpu);
@@ -3027,6 +3052,8 @@ static u64 construct_eptp(unsigned long root_hpa)
/* TODO write the value reading from MSR */
eptp = VMX_EPT_DEFAULT_MT |
VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
+ if (enable_ept_ad_bits)
+ eptp |= VMX_EPT_AD_ENABLE_BIT;
eptp |= (root_hpa & PAGE_MASK);
return eptp;
@@ -3153,11 +3180,22 @@ static int __vmx_get_cpl(struct kvm_vcpu *vcpu)
static int vmx_get_cpl(struct kvm_vcpu *vcpu)
{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+ /*
+ * If we enter real mode with cs.sel & 3 != 0, the normal CPL calculations
+ * fail; use the cache instead.
+ */
+ if (unlikely(vmx->emulation_required && emulate_invalid_guest_state)) {
+ return vmx->cpl;
+ }
+
if (!test_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail)) {
__set_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
- to_vmx(vcpu)->cpl = __vmx_get_cpl(vcpu);
+ vmx->cpl = __vmx_get_cpl(vcpu);
}
- return to_vmx(vcpu)->cpl;
+
+ return vmx->cpl;
}
@@ -3165,7 +3203,7 @@ static u32 vmx_segment_access_rights(struct kvm_segment *var)
{
u32 ar;
- if (var->unusable)
+ if (var->unusable || !var->present)
ar = 1 << 16;
else {
ar = var->type & 15;
@@ -3177,8 +3215,6 @@ static u32 vmx_segment_access_rights(struct kvm_segment *var)
ar |= (var->db & 1) << 14;
ar |= (var->g & 1) << 15;
}
- if (ar == 0) /* a 0 value means unusable */
- ar = AR_UNUSABLE_MASK;
return ar;
}
@@ -3229,6 +3265,44 @@ static void vmx_set_segment(struct kvm_vcpu *vcpu,
vmcs_write32(sf->ar_bytes, ar);
__clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
+
+ /*
+ * Fix segments for real mode guest in hosts that don't have
+ * "unrestricted_mode" or it was disabled.
+ * This is done to allow migration of the guests from hosts with
+ * unrestricted guest like Westmere to older host that don't have
+ * unrestricted guest like Nehelem.
+ */
+ if (!enable_unrestricted_guest && vmx->rmode.vm86_active) {
+ switch (seg) {
+ case VCPU_SREG_CS:
+ vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
+ vmcs_write32(GUEST_CS_LIMIT, 0xffff);
+ if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
+ vmcs_writel(GUEST_CS_BASE, 0xf0000);
+ vmcs_write16(GUEST_CS_SELECTOR,
+ vmcs_readl(GUEST_CS_BASE) >> 4);
+ break;
+ case VCPU_SREG_ES:
+ fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es);
+ break;
+ case VCPU_SREG_DS:
+ fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds);
+ break;
+ case VCPU_SREG_GS:
+ fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs);
+ break;
+ case VCPU_SREG_FS:
+ fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs);
+ break;
+ case VCPU_SREG_SS:
+ vmcs_write16(GUEST_SS_SELECTOR,
+ vmcs_readl(GUEST_SS_BASE) >> 4);
+ vmcs_write32(GUEST_SS_LIMIT, 0xffff);
+ vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
+ break;
+ }
+ }
}
static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
@@ -3731,6 +3805,8 @@ static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx)
if (!enable_ept) {
exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
enable_unrestricted_guest = 0;
+ /* Enable INVPCID for non-ept guests may cause performance regression. */
+ exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID;
}
if (!enable_unrestricted_guest)
exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
@@ -4489,7 +4565,7 @@ static int handle_cr(struct kvm_vcpu *vcpu)
break;
}
vcpu->run->exit_reason = 0;
- pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
+ vcpu_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
(int)(exit_qualification >> 4) & 3, cr);
return 0;
}
@@ -4769,6 +4845,7 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
{
unsigned long exit_qualification;
gpa_t gpa;
+ u32 error_code;
int gla_validity;
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
@@ -4793,7 +4870,13 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
trace_kvm_page_fault(gpa, exit_qualification);
- return kvm_mmu_page_fault(vcpu, gpa, exit_qualification & 0x3, NULL, 0);
+
+ /* It is a write fault? */
+ error_code = exit_qualification & (1U << 1);
+ /* ept page table is present? */
+ error_code |= (exit_qualification >> 3) & 0x1;
+
+ return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0);
}
static u64 ept_rsvd_mask(u64 spte, int level)
@@ -4908,15 +4991,18 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
int ret = 1;
u32 cpu_exec_ctrl;
bool intr_window_requested;
+ unsigned count = 130;
cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING;
- while (!guest_state_valid(vcpu)) {
- if (intr_window_requested
- && (kvm_get_rflags(&vmx->vcpu) & X86_EFLAGS_IF))
+ while (!guest_state_valid(vcpu) && count-- != 0) {
+ if (intr_window_requested && vmx_interrupt_allowed(vcpu))
return handle_interrupt_window(&vmx->vcpu);
+ if (test_bit(KVM_REQ_EVENT, &vcpu->requests))
+ return 1;
+
err = emulate_instruction(vcpu, 0);
if (err == EMULATE_DO_MMIO) {
@@ -4924,8 +5010,12 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
goto out;
}
- if (err != EMULATE_DONE)
+ if (err != EMULATE_DONE) {
+ vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
+ vcpu->run->internal.ndata = 0;
return 0;
+ }
if (signal_pending(current))
goto out;
@@ -4933,7 +5023,7 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
schedule();
}
- vmx->emulation_required = 0;
+ vmx->emulation_required = !guest_state_valid(vcpu);
out:
return ret;
}
@@ -6273,6 +6363,19 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
#endif
);
+#ifndef CONFIG_X86_64
+ /*
+ * The sysexit path does not restore ds/es, so we must set them to
+ * a reasonable value ourselves.
+ *
+ * We can't defer this to vmx_load_host_state() since that function
+ * may be executed in interrupt context, which saves and restore segments
+ * around it, nullifying its effect.
+ */
+ loadsegment(ds, __USER_DS);
+ loadsegment(es, __USER_DS);
+#endif
+
vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
| (1 << VCPU_EXREG_RFLAGS)
| (1 << VCPU_EXREG_CPL)
@@ -6467,6 +6570,23 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
}
}
}
+
+ exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
+ /* Exposing INVPCID only when PCID is exposed */
+ best = kvm_find_cpuid_entry(vcpu, 0x7, 0);
+ if (vmx_invpcid_supported() &&
+ best && (best->ecx & bit(X86_FEATURE_INVPCID)) &&
+ guest_cpuid_has_pcid(vcpu)) {
+ exec_control |= SECONDARY_EXEC_ENABLE_INVPCID;
+ vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
+ exec_control);
+ } else {
+ exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID;
+ vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
+ exec_control);
+ if (best)
+ best->ecx &= ~bit(X86_FEATURE_INVPCID);
+ }
}
static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
@@ -7201,6 +7321,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
.cpuid_update = vmx_cpuid_update,
.rdtscp_supported = vmx_rdtscp_supported,
+ .invpcid_supported = vmx_invpcid_supported,
.set_supported_cpuid = vmx_set_supported_cpuid,
@@ -7230,23 +7351,21 @@ static int __init vmx_init(void)
if (!vmx_io_bitmap_a)
return -ENOMEM;
+ r = -ENOMEM;
+
vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_io_bitmap_b) {
- r = -ENOMEM;
+ if (!vmx_io_bitmap_b)
goto out;
- }
vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_msr_bitmap_legacy) {
- r = -ENOMEM;
+ if (!vmx_msr_bitmap_legacy)
goto out1;
- }
+
vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_msr_bitmap_longmode) {
- r = -ENOMEM;
+ if (!vmx_msr_bitmap_longmode)
goto out2;
- }
+
/*
* Allow direct access to the PC debug port (it is often used for I/O
@@ -7275,8 +7394,10 @@ static int __init vmx_init(void)
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
if (enable_ept) {
- kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
- VMX_EPT_EXECUTABLE_MASK);
+ kvm_mmu_set_mask_ptes(0ull,
+ (enable_ept_ad_bits) ? VMX_EPT_ACCESS_BIT : 0ull,
+ (enable_ept_ad_bits) ? VMX_EPT_DIRTY_BIT : 0ull,
+ 0ull, VMX_EPT_EXECUTABLE_MASK);
ept_set_mmio_spte_mask();
kvm_enable_tdp();
} else
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-23 07:04:57 +0300