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KVM: x86: Move uret MSR slot management to common x86 

Now that SVM and VMX both probe MSRs before "defining" user return slots
for them, consolidate the code for probe+define into common x86 and
eliminate the odd behavior of having the vendor code define the slot for
a given MSR.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210504171734.1434054-14-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-05-04 10:17:32 -07:00 committed by Paolo Bonzini
parent 9cc39a5a43
commit e5fda4bbad
4 changed files with 17 additions and 29 deletions
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3
arch/x86/include/asm/kvm_host.h
View File

@ -1777,9 +1777,8 @@ int kvm_pv_send_ipi(struct kvm *kvm, unsigned long ipi_bitmap_low,
unsigned long ipi_bitmap_high, u32 min,
unsigned long icr, int op_64_bit);
void kvm_define_user_return_msr(unsigned index, u32 msr);
int kvm_add_user_return_msr(u32 msr);
int kvm_find_user_return_msr(u32 msr);
int kvm_probe_user_return_msr(u32 msr);
int kvm_set_user_return_msr(unsigned index, u64 val, u64 mask);
u64 kvm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc);

5
arch/x86/kvm/svm/svm.c
View File

@ -959,10 +959,7 @@ static __init int svm_hardware_setup(void)
kvm_tsc_scaling_ratio_frac_bits = 32;
}
if (!kvm_probe_user_return_msr(MSR_TSC_AUX)) {
tsc_aux_uret_slot = 0;
kvm_define_user_return_msr(tsc_aux_uret_slot, MSR_TSC_AUX);
}
tsc_aux_uret_slot = kvm_add_user_return_msr(MSR_TSC_AUX);
/* Check for pause filtering support */
if (!boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {

19
arch/x86/kvm/vmx/vmx.c
View File

@ -454,9 +454,6 @@ static inline void vmx_segment_cache_clear(struct vcpu_vmx *vmx)
static unsigned long host_idt_base;
/* Number of user return MSRs that are actually supported in hardware. */
static int vmx_nr_uret_msrs;
#if IS_ENABLED(CONFIG_HYPERV)
static bool __read_mostly enlightened_vmcs = true;
module_param(enlightened_vmcs, bool, 0444);
@ -1218,7 +1215,7 @@ void vmx_prepare_switch_to_guest(struct kvm_vcpu *vcpu)
*/
if (!vmx->guest_uret_msrs_loaded) {
vmx->guest_uret_msrs_loaded = true;
for (i = 0; i < vmx_nr_uret_msrs; ++i) {
for (i = 0; i < kvm_nr_uret_msrs; ++i) {
if (!vmx->guest_uret_msrs[i].load_into_hardware)
continue;
@ -6921,7 +6918,7 @@ static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
goto free_vpid;
}
for (i = 0; i < vmx_nr_uret_msrs; ++i) {
for (i = 0; i < kvm_nr_uret_msrs; ++i) {
vmx->guest_uret_msrs[i].data = 0;
vmx->guest_uret_msrs[i].mask = -1ull;
}
@ -7810,20 +7807,12 @@ static __init void vmx_setup_user_return_msrs(void)
MSR_EFER, MSR_TSC_AUX, MSR_STAR,
MSR_IA32_TSX_CTRL,
};
u32 msr;
int i;
BUILD_BUG_ON(ARRAY_SIZE(vmx_uret_msrs_list) != MAX_NR_USER_RETURN_MSRS);
for (i = 0; i < ARRAY_SIZE(vmx_uret_msrs_list); ++i) {
msr = vmx_uret_msrs_list[i];
if (kvm_probe_user_return_msr(msr))
continue;
kvm_define_user_return_msr(vmx_nr_uret_msrs, msr);
vmx_nr_uret_msrs++;
}
for (i = 0; i < ARRAY_SIZE(vmx_uret_msrs_list); ++i)
kvm_add_user_return_msr(vmx_uret_msrs_list[i]);
}
static __init int hardware_setup(void)

19
arch/x86/kvm/x86.c
View File

@ -336,7 +336,7 @@ static void kvm_on_user_return(struct user_return_notifier *urn)
}
}
int kvm_probe_user_return_msr(u32 msr)
static int kvm_probe_user_return_msr(u32 msr)
{
u64 val;
int ret;
@ -350,16 +350,18 @@ out:
preempt_enable();
return ret;
}
EXPORT_SYMBOL_GPL(kvm_probe_user_return_msr);
void kvm_define_user_return_msr(unsigned slot, u32 msr)
int kvm_add_user_return_msr(u32 msr)
{
BUG_ON(slot >= KVM_MAX_NR_USER_RETURN_MSRS);
kvm_uret_msrs_list[slot] = msr;
if (slot >= kvm_nr_uret_msrs)
kvm_nr_uret_msrs = slot + 1;
BUG_ON(kvm_nr_uret_msrs >= KVM_MAX_NR_USER_RETURN_MSRS);
if (kvm_probe_user_return_msr(msr))
return -1;
kvm_uret_msrs_list[kvm_nr_uret_msrs] = msr;
return kvm_nr_uret_msrs++;
}
EXPORT_SYMBOL_GPL(kvm_define_user_return_msr);
EXPORT_SYMBOL_GPL(kvm_add_user_return_msr);
int kvm_find_user_return_msr(u32 msr)
{
@ -8132,6 +8134,7 @@ int kvm_arch_init(void *opaque)
printk(KERN_ERR "kvm: failed to allocate percpu kvm_user_return_msrs\n");
goto out_free_x86_emulator_cache;
}
kvm_nr_uret_msrs = 0;
r = kvm_mmu_module_init();
if (r)