| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20210504171734.1434054-14-seanjc@google.com>
Date: Tue, 4 May 2021 10:17:32 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: Sean Christopherson <seanjc@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, Xiaoyao Li <xiaoyao.li@...el.com>,
Reiji Watanabe <reijiw@...gle.com>
Subject: [PATCH 13/15] 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@...gle.com>
---
arch/x86/include/asm/kvm_host.h | 3 +--
arch/x86/kvm/svm/svm.c | 5 +----
arch/x86/kvm/vmx/vmx.c | 19 ++++---------------
arch/x86/kvm/x86.c | 19 +++++++++++--------
4 files changed, 17 insertions(+), 29 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 10663610f105..a4b912f7e427 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1778,9 +1778,8 @@ 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);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 231b9650d864..de921935e8de 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -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)) {
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 7a53568b34fc..26f82f302391 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -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)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2fd46e917666..adca491d3b4b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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 @@ int kvm_probe_user_return_msr(u32 msr)
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)
{
@@ -8169,6 +8171,7 @@ 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)
--
2.31.1.527.g47e6f16901-goog
Powered by blists - more mailing lists