[PATCH v6 3/7] KVM: x86: Prepare MSR bitmaps for userspace tracked MSRs
From: Alexander Graf
Date: Tue Sep 01 2020 - 16:16:04 EST
From: Aaron Lewis <aaronlewis@xxxxxxxxxx>
Prepare vmx and svm for a subsequent change that ensures the MSR permission
bitmap is set to allow an MSR that userspace is tracking to force a vmx_vmexit
in the guest.
Signed-off-by: Aaron Lewis <aaronlewis@xxxxxxxxxx>
Reviewed-by: Oliver Upton <oupton@xxxxxxxxxx>
Signed-off-by: Alexander Graf <graf@xxxxxxxxxx>
---
arch/x86/kvm/svm/svm.c | 48 +++++++++++-----------
arch/x86/kvm/vmx/nested.c | 2 +-
arch/x86/kvm/vmx/vmx.c | 83 +++++++++++++++++++--------------------
arch/x86/kvm/vmx/vmx.h | 2 +-
4 files changed, 67 insertions(+), 68 deletions(-)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index c0da4dd78ac5..eb673b59f7b7 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -564,7 +564,7 @@ static bool valid_msr_intercept(u32 index)
return false;
}
-static bool msr_write_intercepted(struct kvm_vcpu *vcpu, unsigned msr)
+static bool msr_write_intercepted(struct kvm_vcpu *vcpu, u32 msr)
{
u8 bit_write;
unsigned long tmp;
@@ -583,9 +583,11 @@ static bool msr_write_intercepted(struct kvm_vcpu *vcpu, unsigned msr)
return !!test_bit(bit_write, &tmp);
}
-static void set_msr_interception(u32 *msrpm, unsigned msr,
- int read, int write)
+static void set_msr_interception(struct kvm_vcpu *vcpu, u32 msr, int read,
+ int write)
{
+ struct vcpu_svm *svm = to_svm(vcpu);
+ u32 *msrpm = svm->msrpm;
u8 bit_read, bit_write;
unsigned long tmp;
u32 offset;
@@ -609,7 +611,7 @@ static void set_msr_interception(u32 *msrpm, unsigned msr,
msrpm[offset] = tmp;
}
-static void svm_vcpu_init_msrpm(u32 *msrpm)
+static void svm_vcpu_init_msrpm(struct kvm_vcpu *vcpu, u32 *msrpm)
{
int i;
@@ -619,7 +621,7 @@ static void svm_vcpu_init_msrpm(u32 *msrpm)
if (!direct_access_msrs[i].always)
continue;
- set_msr_interception(msrpm, direct_access_msrs[i].index, 1, 1);
+ set_msr_interception(vcpu, direct_access_msrs[i].index, 1, 1);
}
}
@@ -666,26 +668,26 @@ static void init_msrpm_offsets(void)
}
}
-static void svm_enable_lbrv(struct vcpu_svm *svm)
+static void svm_enable_lbrv(struct kvm_vcpu *vcpu)
{
- u32 *msrpm = svm->msrpm;
+ struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb->control.virt_ext |= LBR_CTL_ENABLE_MASK;
- set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
- set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
- set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
- set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
+ set_msr_interception(vcpu, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
+ set_msr_interception(vcpu, MSR_IA32_LASTBRANCHTOIP, 1, 1);
+ set_msr_interception(vcpu, MSR_IA32_LASTINTFROMIP, 1, 1);
+ set_msr_interception(vcpu, MSR_IA32_LASTINTTOIP, 1, 1);
}
-static void svm_disable_lbrv(struct vcpu_svm *svm)
+static void svm_disable_lbrv(struct kvm_vcpu *vcpu)
{
- u32 *msrpm = svm->msrpm;
+ struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb->control.virt_ext &= ~LBR_CTL_ENABLE_MASK;
- set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
- set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
- set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
- set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
+ set_msr_interception(vcpu, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
+ set_msr_interception(vcpu, MSR_IA32_LASTBRANCHTOIP, 0, 0);
+ set_msr_interception(vcpu, MSR_IA32_LASTINTFROMIP, 0, 0);
+ set_msr_interception(vcpu, MSR_IA32_LASTINTTOIP, 0, 0);
}
void disable_nmi_singlestep(struct vcpu_svm *svm)
@@ -1196,10 +1198,10 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
clear_page(svm->nested.hsave);
svm->msrpm = page_address(msrpm_pages);
- svm_vcpu_init_msrpm(svm->msrpm);
+ svm_vcpu_init_msrpm(vcpu, svm->msrpm);
svm->nested.msrpm = page_address(nested_msrpm_pages);
- svm_vcpu_init_msrpm(svm->nested.msrpm);
+ svm_vcpu_init_msrpm(vcpu, svm->nested.msrpm);
svm->vmcb = page_address(page);
clear_page(svm->vmcb);
@@ -2540,7 +2542,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
* We update the L1 MSR bit as well since it will end up
* touching the MSR anyway now.
*/
- set_msr_interception(svm->msrpm, MSR_IA32_SPEC_CTRL, 1, 1);
+ set_msr_interception(vcpu, MSR_IA32_SPEC_CTRL, 1, 1);
break;
case MSR_IA32_PRED_CMD:
if (!msr->host_initiated &&
@@ -2555,7 +2557,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
break;
wrmsrl(MSR_IA32_PRED_CMD, PRED_CMD_IBPB);
- set_msr_interception(svm->msrpm, MSR_IA32_PRED_CMD, 0, 1);
+ set_msr_interception(vcpu, MSR_IA32_PRED_CMD, 0, 1);
break;
case MSR_AMD64_VIRT_SPEC_CTRL:
if (!msr->host_initiated &&
@@ -2619,9 +2621,9 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
svm->vmcb->save.dbgctl = data;
mark_dirty(svm->vmcb, VMCB_LBR);
if (data & (1ULL<<0))
- svm_enable_lbrv(svm);
+ svm_enable_lbrv(vcpu);
else
- svm_disable_lbrv(svm);
+ svm_disable_lbrv(vcpu);
break;
case MSR_VM_HSAVE_PA:
svm->nested.hsave_msr = data;
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index d4a4cec034d0..9313814d9e91 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4704,7 +4704,7 @@ static int enter_vmx_operation(struct kvm_vcpu *vcpu)
if (vmx_pt_mode_is_host_guest()) {
vmx->pt_desc.guest.ctl = 0;
- pt_update_intercept_for_msr(vmx);
+ pt_update_intercept_for_msr(vcpu);
}
return 0;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 13745f2a5ecd..1313e47a5a1e 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -342,7 +342,7 @@ module_param_cb(vmentry_l1d_flush, &vmentry_l1d_flush_ops, NULL, 0644);
static bool guest_state_valid(struct kvm_vcpu *vcpu);
static u32 vmx_segment_access_rights(struct kvm_segment *var);
-static __always_inline void vmx_disable_intercept_for_msr(unsigned long *msr_bitmap,
+static __always_inline void vmx_disable_intercept_for_msr(struct kvm_vcpu *vcpu,
u32 msr, int type);
void vmx_vmexit(void);
@@ -2081,7 +2081,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
* in the merging. We update the vmcs01 here for L1 as well
* since it will end up touching the MSR anyway now.
*/
- vmx_disable_intercept_for_msr(vmx->vmcs01.msr_bitmap,
+ vmx_disable_intercept_for_msr(vcpu,
MSR_IA32_SPEC_CTRL,
MSR_TYPE_RW);
break;
@@ -2117,8 +2117,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
* vmcs02.msr_bitmap here since it gets completely overwritten
* in the merging.
*/
- vmx_disable_intercept_for_msr(vmx->vmcs01.msr_bitmap, MSR_IA32_PRED_CMD,
- MSR_TYPE_W);
+ vmx_disable_intercept_for_msr(vcpu, MSR_IA32_PRED_CMD, MSR_TYPE_W);
break;
case MSR_IA32_CR_PAT:
if (!kvm_pat_valid(data))
@@ -2168,7 +2167,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
return 1;
vmcs_write64(GUEST_IA32_RTIT_CTL, data);
vmx->pt_desc.guest.ctl = data;
- pt_update_intercept_for_msr(vmx);
+ pt_update_intercept_for_msr(vcpu);
break;
case MSR_IA32_RTIT_STATUS:
if (!pt_can_write_msr(vmx))
@@ -3691,9 +3690,11 @@ void free_vpid(int vpid)
spin_unlock(&vmx_vpid_lock);
}
-static __always_inline void vmx_disable_intercept_for_msr(unsigned long *msr_bitmap,
+static __always_inline void vmx_disable_intercept_for_msr(struct kvm_vcpu *vcpu,
u32 msr, int type)
{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ unsigned long *msr_bitmap = vmx->vmcs01.msr_bitmap;
int f = sizeof(unsigned long);
if (!cpu_has_vmx_msr_bitmap())
@@ -3729,9 +3730,11 @@ static __always_inline void vmx_disable_intercept_for_msr(unsigned long *msr_bit
}
}
-static __always_inline void vmx_enable_intercept_for_msr(unsigned long *msr_bitmap,
+static __always_inline void vmx_enable_intercept_for_msr(struct kvm_vcpu *vcpu,
u32 msr, int type)
{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ unsigned long *msr_bitmap = vmx->vmcs01.msr_bitmap;
int f = sizeof(unsigned long);
if (!cpu_has_vmx_msr_bitmap())
@@ -3767,13 +3770,13 @@ static __always_inline void vmx_enable_intercept_for_msr(unsigned long *msr_bitm
}
}
-static __always_inline void vmx_set_intercept_for_msr(unsigned long *msr_bitmap,
- u32 msr, int type, bool value)
+static __always_inline void vmx_set_intercept_for_msr(struct kvm_vcpu *vcpu,
+ u32 msr, int type, bool value)
{
if (value)
- vmx_enable_intercept_for_msr(msr_bitmap, msr, type);
+ vmx_enable_intercept_for_msr(vcpu, msr, type);
else
- vmx_disable_intercept_for_msr(msr_bitmap, msr, type);
+ vmx_disable_intercept_for_msr(vcpu, msr, type);
}
static u8 vmx_msr_bitmap_mode(struct kvm_vcpu *vcpu)
@@ -3791,8 +3794,8 @@ static u8 vmx_msr_bitmap_mode(struct kvm_vcpu *vcpu)
return mode;
}
-static void vmx_update_msr_bitmap_x2apic(unsigned long *msr_bitmap,
- u8 mode)
+static void vmx_update_msr_bitmap_x2apic(struct kvm_vcpu *vcpu,
+ unsigned long *msr_bitmap, u8 mode)
{
int msr;
@@ -3807,11 +3810,11 @@ static void vmx_update_msr_bitmap_x2apic(unsigned long *msr_bitmap,
* TPR reads and writes can be virtualized even if virtual interrupt
* delivery is not in use.
*/
- vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_TASKPRI), MSR_TYPE_RW);
+ vmx_disable_intercept_for_msr(vcpu, X2APIC_MSR(APIC_TASKPRI), MSR_TYPE_RW);
if (mode & MSR_BITMAP_MODE_X2APIC_APICV) {
- vmx_enable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_TMCCT), MSR_TYPE_R);
- vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_EOI), MSR_TYPE_W);
- vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_SELF_IPI), MSR_TYPE_W);
+ vmx_enable_intercept_for_msr(vcpu, X2APIC_MSR(APIC_TMCCT), MSR_TYPE_RW);
+ vmx_disable_intercept_for_msr(vcpu, X2APIC_MSR(APIC_EOI), MSR_TYPE_W);
+ vmx_disable_intercept_for_msr(vcpu, X2APIC_MSR(APIC_SELF_IPI), MSR_TYPE_W);
}
}
}
@@ -3827,30 +3830,24 @@ void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu)
return;
if (changed & (MSR_BITMAP_MODE_X2APIC | MSR_BITMAP_MODE_X2APIC_APICV))
- vmx_update_msr_bitmap_x2apic(msr_bitmap, mode);
+ vmx_update_msr_bitmap_x2apic(vcpu, msr_bitmap, mode);
vmx->msr_bitmap_mode = mode;
}
-void pt_update_intercept_for_msr(struct vcpu_vmx *vmx)
+void pt_update_intercept_for_msr(struct kvm_vcpu *vcpu)
{
- unsigned long *msr_bitmap = vmx->vmcs01.msr_bitmap;
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
bool flag = !(vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN);
u32 i;
- vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_STATUS,
- MSR_TYPE_RW, flag);
- vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_OUTPUT_BASE,
- MSR_TYPE_RW, flag);
- vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_OUTPUT_MASK,
- MSR_TYPE_RW, flag);
- vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_CR3_MATCH,
- MSR_TYPE_RW, flag);
+ vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_STATUS, MSR_TYPE_RW, flag);
+ vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_OUTPUT_BASE, MSR_TYPE_RW, flag);
+ vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_OUTPUT_MASK, MSR_TYPE_RW, flag);
+ vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_CR3_MATCH, MSR_TYPE_RW, flag);
for (i = 0; i < vmx->pt_desc.addr_range; i++) {
- vmx_set_intercept_for_msr(msr_bitmap,
- MSR_IA32_RTIT_ADDR0_A + i * 2, MSR_TYPE_RW, flag);
- vmx_set_intercept_for_msr(msr_bitmap,
- MSR_IA32_RTIT_ADDR0_B + i * 2, MSR_TYPE_RW, flag);
+ vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_ADDR0_A + i * 2, MSR_TYPE_RW, flag);
+ vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_ADDR0_B + i * 2, MSR_TYPE_RW, flag);
}
}
@@ -6905,18 +6902,18 @@ static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
goto free_pml;
msr_bitmap = vmx->vmcs01.msr_bitmap;
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_TSC, MSR_TYPE_R);
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_FS_BASE, MSR_TYPE_RW);
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_GS_BASE, MSR_TYPE_RW);
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_KERNEL_GS_BASE, MSR_TYPE_RW);
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_CS, MSR_TYPE_RW);
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_ESP, MSR_TYPE_RW);
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_EIP, MSR_TYPE_RW);
+ vmx_disable_intercept_for_msr(vcpu, MSR_IA32_TSC, MSR_TYPE_R);
+ vmx_disable_intercept_for_msr(vcpu, MSR_FS_BASE, MSR_TYPE_RW);
+ vmx_disable_intercept_for_msr(vcpu, MSR_GS_BASE, MSR_TYPE_RW);
+ vmx_disable_intercept_for_msr(vcpu, MSR_KERNEL_GS_BASE, MSR_TYPE_RW);
+ vmx_disable_intercept_for_msr(vcpu, MSR_IA32_SYSENTER_CS, MSR_TYPE_RW);
+ vmx_disable_intercept_for_msr(vcpu, MSR_IA32_SYSENTER_ESP, MSR_TYPE_RW);
+ vmx_disable_intercept_for_msr(vcpu, MSR_IA32_SYSENTER_EIP, MSR_TYPE_RW);
if (kvm_cstate_in_guest(vcpu->kvm)) {
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C1_RES, MSR_TYPE_R);
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C3_RESIDENCY, MSR_TYPE_R);
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C6_RESIDENCY, MSR_TYPE_R);
- vmx_disable_intercept_for_msr(msr_bitmap, MSR_CORE_C7_RESIDENCY, MSR_TYPE_R);
+ vmx_disable_intercept_for_msr(vcpu, MSR_CORE_C1_RES, MSR_TYPE_R);
+ vmx_disable_intercept_for_msr(vcpu, MSR_CORE_C3_RESIDENCY, MSR_TYPE_R);
+ vmx_disable_intercept_for_msr(vcpu, MSR_CORE_C6_RESIDENCY, MSR_TYPE_R);
+ vmx_disable_intercept_for_msr(vcpu, MSR_CORE_C7_RESIDENCY, MSR_TYPE_R);
}
vmx->msr_bitmap_mode = 0;
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 639798e4a6ca..b3c74f0fe8a1 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -350,7 +350,7 @@ bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu);
void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked);
void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu);
struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr);
-void pt_update_intercept_for_msr(struct vcpu_vmx *vmx);
+void pt_update_intercept_for_msr(struct kvm_vcpu *vcpu);
void vmx_update_host_rsp(struct vcpu_vmx *vmx, unsigned long host_rsp);
int vmx_find_msr_index(struct vmx_msrs *m, u32 msr);
int vmx_handle_memory_failure(struct kvm_vcpu *vcpu, int r,
--
2.17.1
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Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
Ust-ID: DE 289 237 879