The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 2183de4161b90bd3851ccd3910c87b2c9adfc6ed Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc(a)google.com>
Date: Tue, 4 May 2021 10:17:23 -0700
Subject: [PATCH] KVM: x86: Move RDPID emulation intercept to its own enum
Add a dedicated intercept enum for RDPID instead of piggybacking RDTSCP.
Unlike VMX's ENABLE_RDTSCP, RDPID is not bound to SVM's RDTSCP intercept.
Fixes: fb6d4d340e05 ("KVM: x86: emulate RDPID")
Cc: stable(a)vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc(a)google.com>
Message-Id: <20210504171734.1434054-5-seanjc(a)google.com>
Reviewed-by: Jim Mattson <jmattson(a)google.com>
Signed-off-by: Paolo Bonzini <pbonzini(a)redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 77e1c89a95a7..8a0ccdb56076 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4502,7 +4502,7 @@ static const struct opcode group8[] = {
* from the register case of group9.
*/
static const struct gprefix pfx_0f_c7_7 = {
- N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdtscp),
+ N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdpid),
};
diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index 0d359115429a..f016838faedd 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -468,6 +468,7 @@ enum x86_intercept {
x86_intercept_clgi,
x86_intercept_skinit,
x86_intercept_rdtscp,
+ x86_intercept_rdpid,
x86_intercept_icebp,
x86_intercept_wbinvd,
x86_intercept_monitor,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 46573b862638..4a625c748275 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7437,8 +7437,9 @@ static int vmx_check_intercept(struct kvm_vcpu *vcpu,
/*
* RDPID causes #UD if disabled through secondary execution controls.
* Because it is marked as EmulateOnUD, we need to intercept it here.
+ * Note, RDPID is hidden behind ENABLE_RDTSCP.
*/
- case x86_intercept_rdtscp:
+ case x86_intercept_rdpid:
if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_RDTSCP)) {
exception->vector = UD_VECTOR;
exception->error_code_valid = false;
The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 2183de4161b90bd3851ccd3910c87b2c9adfc6ed Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc(a)google.com>
Date: Tue, 4 May 2021 10:17:23 -0700
Subject: [PATCH] KVM: x86: Move RDPID emulation intercept to its own enum
Add a dedicated intercept enum for RDPID instead of piggybacking RDTSCP.
Unlike VMX's ENABLE_RDTSCP, RDPID is not bound to SVM's RDTSCP intercept.
Fixes: fb6d4d340e05 ("KVM: x86: emulate RDPID")
Cc: stable(a)vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc(a)google.com>
Message-Id: <20210504171734.1434054-5-seanjc(a)google.com>
Reviewed-by: Jim Mattson <jmattson(a)google.com>
Signed-off-by: Paolo Bonzini <pbonzini(a)redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 77e1c89a95a7..8a0ccdb56076 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4502,7 +4502,7 @@ static const struct opcode group8[] = {
* from the register case of group9.
*/
static const struct gprefix pfx_0f_c7_7 = {
- N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdtscp),
+ N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdpid),
};
diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index 0d359115429a..f016838faedd 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -468,6 +468,7 @@ enum x86_intercept {
x86_intercept_clgi,
x86_intercept_skinit,
x86_intercept_rdtscp,
+ x86_intercept_rdpid,
x86_intercept_icebp,
x86_intercept_wbinvd,
x86_intercept_monitor,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 46573b862638..4a625c748275 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7437,8 +7437,9 @@ static int vmx_check_intercept(struct kvm_vcpu *vcpu,
/*
* RDPID causes #UD if disabled through secondary execution controls.
* Because it is marked as EmulateOnUD, we need to intercept it here.
+ * Note, RDPID is hidden behind ENABLE_RDTSCP.
*/
- case x86_intercept_rdtscp:
+ case x86_intercept_rdpid:
if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_RDTSCP)) {
exception->vector = UD_VECTOR;
exception->error_code_valid = false;
The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 2183de4161b90bd3851ccd3910c87b2c9adfc6ed Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc(a)google.com>
Date: Tue, 4 May 2021 10:17:23 -0700
Subject: [PATCH] KVM: x86: Move RDPID emulation intercept to its own enum
Add a dedicated intercept enum for RDPID instead of piggybacking RDTSCP.
Unlike VMX's ENABLE_RDTSCP, RDPID is not bound to SVM's RDTSCP intercept.
Fixes: fb6d4d340e05 ("KVM: x86: emulate RDPID")
Cc: stable(a)vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc(a)google.com>
Message-Id: <20210504171734.1434054-5-seanjc(a)google.com>
Reviewed-by: Jim Mattson <jmattson(a)google.com>
Signed-off-by: Paolo Bonzini <pbonzini(a)redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 77e1c89a95a7..8a0ccdb56076 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4502,7 +4502,7 @@ static const struct opcode group8[] = {
* from the register case of group9.
*/
static const struct gprefix pfx_0f_c7_7 = {
- N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdtscp),
+ N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdpid),
};
diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index 0d359115429a..f016838faedd 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -468,6 +468,7 @@ enum x86_intercept {
x86_intercept_clgi,
x86_intercept_skinit,
x86_intercept_rdtscp,
+ x86_intercept_rdpid,
x86_intercept_icebp,
x86_intercept_wbinvd,
x86_intercept_monitor,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 46573b862638..4a625c748275 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7437,8 +7437,9 @@ static int vmx_check_intercept(struct kvm_vcpu *vcpu,
/*
* RDPID causes #UD if disabled through secondary execution controls.
* Because it is marked as EmulateOnUD, we need to intercept it here.
+ * Note, RDPID is hidden behind ENABLE_RDTSCP.
*/
- case x86_intercept_rdtscp:
+ case x86_intercept_rdpid:
if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_RDTSCP)) {
exception->vector = UD_VECTOR;
exception->error_code_valid = false;
The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 2183de4161b90bd3851ccd3910c87b2c9adfc6ed Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc(a)google.com>
Date: Tue, 4 May 2021 10:17:23 -0700
Subject: [PATCH] KVM: x86: Move RDPID emulation intercept to its own enum
Add a dedicated intercept enum for RDPID instead of piggybacking RDTSCP.
Unlike VMX's ENABLE_RDTSCP, RDPID is not bound to SVM's RDTSCP intercept.
Fixes: fb6d4d340e05 ("KVM: x86: emulate RDPID")
Cc: stable(a)vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc(a)google.com>
Message-Id: <20210504171734.1434054-5-seanjc(a)google.com>
Reviewed-by: Jim Mattson <jmattson(a)google.com>
Signed-off-by: Paolo Bonzini <pbonzini(a)redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 77e1c89a95a7..8a0ccdb56076 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4502,7 +4502,7 @@ static const struct opcode group8[] = {
* from the register case of group9.
*/
static const struct gprefix pfx_0f_c7_7 = {
- N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdtscp),
+ N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdpid),
};
diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index 0d359115429a..f016838faedd 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -468,6 +468,7 @@ enum x86_intercept {
x86_intercept_clgi,
x86_intercept_skinit,
x86_intercept_rdtscp,
+ x86_intercept_rdpid,
x86_intercept_icebp,
x86_intercept_wbinvd,
x86_intercept_monitor,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 46573b862638..4a625c748275 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7437,8 +7437,9 @@ static int vmx_check_intercept(struct kvm_vcpu *vcpu,
/*
* RDPID causes #UD if disabled through secondary execution controls.
* Because it is marked as EmulateOnUD, we need to intercept it here.
+ * Note, RDPID is hidden behind ENABLE_RDTSCP.
*/
- case x86_intercept_rdtscp:
+ case x86_intercept_rdpid:
if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_RDTSCP)) {
exception->vector = UD_VECTOR;
exception->error_code_valid = false;
The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 2183de4161b90bd3851ccd3910c87b2c9adfc6ed Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc(a)google.com>
Date: Tue, 4 May 2021 10:17:23 -0700
Subject: [PATCH] KVM: x86: Move RDPID emulation intercept to its own enum
Add a dedicated intercept enum for RDPID instead of piggybacking RDTSCP.
Unlike VMX's ENABLE_RDTSCP, RDPID is not bound to SVM's RDTSCP intercept.
Fixes: fb6d4d340e05 ("KVM: x86: emulate RDPID")
Cc: stable(a)vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc(a)google.com>
Message-Id: <20210504171734.1434054-5-seanjc(a)google.com>
Reviewed-by: Jim Mattson <jmattson(a)google.com>
Signed-off-by: Paolo Bonzini <pbonzini(a)redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 77e1c89a95a7..8a0ccdb56076 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4502,7 +4502,7 @@ static const struct opcode group8[] = {
* from the register case of group9.
*/
static const struct gprefix pfx_0f_c7_7 = {
- N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdtscp),
+ N, N, N, II(DstMem | ModRM | Op3264 | EmulateOnUD, em_rdpid, rdpid),
};
diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index 0d359115429a..f016838faedd 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -468,6 +468,7 @@ enum x86_intercept {
x86_intercept_clgi,
x86_intercept_skinit,
x86_intercept_rdtscp,
+ x86_intercept_rdpid,
x86_intercept_icebp,
x86_intercept_wbinvd,
x86_intercept_monitor,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 46573b862638..4a625c748275 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7437,8 +7437,9 @@ static int vmx_check_intercept(struct kvm_vcpu *vcpu,
/*
* RDPID causes #UD if disabled through secondary execution controls.
* Because it is marked as EmulateOnUD, we need to intercept it here.
+ * Note, RDPID is hidden behind ENABLE_RDTSCP.
*/
- case x86_intercept_rdtscp:
+ case x86_intercept_rdpid:
if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_RDTSCP)) {
exception->vector = UD_VECTOR;
exception->error_code_valid = false;
The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable(a)vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From b6b4fbd90b155a0025223df2c137af8a701d53b3 Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc(a)google.com>
Date: Tue, 4 May 2021 15:56:31 -0700
Subject: [PATCH] x86/cpu: Initialize MSR_TSC_AUX if RDTSCP *or* RDPID is
supported
Initialize MSR_TSC_AUX with CPU node information if RDTSCP or RDPID is
supported. This fixes a bug where vdso_read_cpunode() will read garbage
via RDPID if RDPID is supported but RDTSCP is not. While no known CPU
supports RDPID but not RDTSCP, both Intel's SDM and AMD's APM allow for
RDPID to exist without RDTSCP, e.g. it's technically a legal CPU model
for a virtual machine.
Note, technically MSR_TSC_AUX could be initialized if and only if RDPID
is supported since RDTSCP is currently not used to retrieve the CPU node.
But, the cost of the superfluous WRMSR is negigible, whereas leaving
MSR_TSC_AUX uninitialized is just asking for future breakage if someone
decides to utilize RDTSCP.
Fixes: a582c540ac1b ("x86/vdso: Use RDPID in preference to LSL when available")
Signed-off-by: Sean Christopherson <seanjc(a)google.com>
Signed-off-by: Thomas Gleixner <tglx(a)linutronix.de>
Cc: stable(a)vger.kernel.org
Link: https://lore.kernel.org/r/20210504225632.1532621-2-seanjc@google.com
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 6bdb69a9a7dc..490bed07fe35 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1851,7 +1851,7 @@ static inline void setup_getcpu(int cpu)
unsigned long cpudata = vdso_encode_cpunode(cpu, early_cpu_to_node(cpu));
struct desc_struct d = { };
- if (boot_cpu_has(X86_FEATURE_RDTSCP))
+ if (boot_cpu_has(X86_FEATURE_RDTSCP) || boot_cpu_has(X86_FEATURE_RDPID))
write_rdtscp_aux(cpudata);
/* Store CPU and node number in limit. */