The patch below does not apply to the 6.6-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>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 29da8c823abffdacb71c7c07ec48fcf9eb38757c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101638-lively-electable-a835@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 29da8c823abffdacb71c7c07ec48fcf9eb38757c Mon Sep 17 00:00:00 2001
From: Hou Wenlong <houwenlong.hwl(a)antgroup.com>
Date: Tue, 23 Sep 2025 08:37:38 -0700
Subject: [PATCH] KVM: SVM: Re-load current, not host, TSC_AUX on #VMEXIT from
SEV-ES guest
Prior to running an SEV-ES guest, set TSC_AUX in the host save area to the
current value in hardware, as tracked by the user return infrastructure,
instead of always loading the host's desired value for the CPU. If the
pCPU is also running a non-SEV-ES vCPU, loading the host's value on #VMEXIT
could clobber the other vCPU's value, e.g. if the SEV-ES vCPU preempted
the non-SEV-ES vCPU, in which case KVM expects the other vCPU's TSC_AUX
value to be resident in hardware.
Note, unlike TDX, which blindly _zeroes_ TSC_AUX on TD-Exit, SEV-ES CPUs
can load an arbitrary value. Stuff the current value in the host save
area instead of refreshing the user return cache so that KVM doesn't need
to track whether or not the vCPU actually enterred the guest and thus
loaded TSC_AUX from the host save area.
Opportunistically tag tsc_aux_uret_slot as read-only after init to guard
against unexpected modifications, and to make it obvious that using the
variable in sev_es_prepare_switch_to_guest() is safe.
Fixes: 916e3e5f26ab ("KVM: SVM: Do not use user return MSR support for virtualized TSC_AUX")
Cc: stable(a)vger.kernel.org
Suggested-by: Lai Jiangshan <jiangshan.ljs(a)antgroup.com>
Signed-off-by: Hou Wenlong <houwenlong.hwl(a)antgroup.com>
[sean: handle the SEV-ES case in sev_es_prepare_switch_to_guest()]
Reviewed-by: Xiaoyao Li <xiaoyao.li(a)intel.com>
Link: https://lore.kernel.org/r/20250923153738.1875174-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc(a)google.com>
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 019d920fe442..5529e4c3362b 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -4666,6 +4666,16 @@ void sev_es_prepare_switch_to_guest(struct vcpu_svm *svm, struct sev_es_save_are
hostsa->dr2_addr_mask = amd_get_dr_addr_mask(2);
hostsa->dr3_addr_mask = amd_get_dr_addr_mask(3);
}
+
+ /*
+ * TSC_AUX is always virtualized for SEV-ES guests when the feature is
+ * available, i.e. TSC_AUX is loaded on #VMEXIT from the host save area.
+ * Set the save area to the current hardware value, i.e. the current
+ * user return value, so that the correct value is restored on #VMEXIT.
+ */
+ if (cpu_feature_enabled(X86_FEATURE_V_TSC_AUX) &&
+ !WARN_ON_ONCE(tsc_aux_uret_slot < 0))
+ hostsa->tsc_aux = kvm_get_user_return_msr(tsc_aux_uret_slot);
}
void sev_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index b237b4081c91..6f486fb82144 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -195,7 +195,7 @@ static DEFINE_MUTEX(vmcb_dump_mutex);
* RDTSCP and RDPID are not used in the kernel, specifically to allow KVM to
* defer the restoration of TSC_AUX until the CPU returns to userspace.
*/
-static int tsc_aux_uret_slot __read_mostly = -1;
+int tsc_aux_uret_slot __ro_after_init = -1;
static int get_npt_level(void)
{
@@ -577,18 +577,6 @@ static int svm_enable_virtualization_cpu(void)
amd_pmu_enable_virt();
- /*
- * If TSC_AUX virtualization is supported, TSC_AUX becomes a swap type
- * "B" field (see sev_es_prepare_switch_to_guest()) for SEV-ES guests.
- * Since Linux does not change the value of TSC_AUX once set, prime the
- * TSC_AUX field now to avoid a RDMSR on every vCPU run.
- */
- if (boot_cpu_has(X86_FEATURE_V_TSC_AUX)) {
- u32 __maybe_unused msr_hi;
-
- rdmsr(MSR_TSC_AUX, sev_es_host_save_area(sd)->tsc_aux, msr_hi);
- }
-
return 0;
}
@@ -1406,10 +1394,10 @@ static void svm_prepare_switch_to_guest(struct kvm_vcpu *vcpu)
__svm_write_tsc_multiplier(vcpu->arch.tsc_scaling_ratio);
/*
- * TSC_AUX is always virtualized for SEV-ES guests when the feature is
- * available. The user return MSR support is not required in this case
- * because TSC_AUX is restored on #VMEXIT from the host save area
- * (which has been initialized in svm_enable_virtualization_cpu()).
+ * TSC_AUX is always virtualized (context switched by hardware) for
+ * SEV-ES guests when the feature is available. For non-SEV-ES guests,
+ * context switch TSC_AUX via the user_return MSR infrastructure (not
+ * all CPUs support TSC_AUX virtualization).
*/
if (likely(tsc_aux_uret_slot >= 0) &&
(!boot_cpu_has(X86_FEATURE_V_TSC_AUX) || !sev_es_guest(vcpu->kvm)))
@@ -3004,8 +2992,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
* TSC_AUX is always virtualized for SEV-ES guests when the
* feature is available. The user return MSR support is not
* required in this case because TSC_AUX is restored on #VMEXIT
- * from the host save area (which has been initialized in
- * svm_enable_virtualization_cpu()).
+ * from the host save area.
*/
if (boot_cpu_has(X86_FEATURE_V_TSC_AUX) && sev_es_guest(vcpu->kvm))
break;
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 10d5cbc259e1..ec3fb318ca83 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -52,6 +52,8 @@ extern bool x2avic_enabled;
extern bool vnmi;
extern int lbrv;
+extern int tsc_aux_uret_slot __ro_after_init;
+
/*
* Clean bits in VMCB.
* VMCB_ALL_CLEAN_MASK might also need to
The patch below does not apply to the 5.10-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>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 195a1b7d8388c0ec2969a39324feb8bebf9bb907
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101631-croon-serving-8366@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 195a1b7d8388c0ec2969a39324feb8bebf9bb907 Mon Sep 17 00:00:00 2001
From: Yang Shi <yang(a)os.amperecomputing.com>
Date: Thu, 18 Sep 2025 09:23:49 -0700
Subject: [PATCH] arm64: kprobes: call set_memory_rox() for kprobe page
The kprobe page is allocated by execmem allocator with ROX permission.
It needs to call set_memory_rox() to set proper permission for the
direct map too. It was missed.
Fixes: 10d5e97c1bf8 ("arm64: use PAGE_KERNEL_ROX directly in alloc_insn_page")
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Yang Shi <yang(a)os.amperecomputing.com>
Reviewed-by: Catalin Marinas <catalin.marinas(a)arm.com>
Signed-off-by: Will Deacon <will(a)kernel.org>
diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
index 0c5d408afd95..8ab6104a4883 100644
--- a/arch/arm64/kernel/probes/kprobes.c
+++ b/arch/arm64/kernel/probes/kprobes.c
@@ -10,6 +10,7 @@
#define pr_fmt(fmt) "kprobes: " fmt
+#include <linux/execmem.h>
#include <linux/extable.h>
#include <linux/kasan.h>
#include <linux/kernel.h>
@@ -41,6 +42,17 @@ DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
static void __kprobes
post_kprobe_handler(struct kprobe *, struct kprobe_ctlblk *, struct pt_regs *);
+void *alloc_insn_page(void)
+{
+ void *addr;
+
+ addr = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE);
+ if (!addr)
+ return NULL;
+ set_memory_rox((unsigned long)addr, 1);
+ return addr;
+}
+
static void __kprobes arch_prepare_ss_slot(struct kprobe *p)
{
kprobe_opcode_t *addr = p->ainsn.xol_insn;
Hi Stable,
Please provide a quote for your products:
Include:
1.Pricing (per unit)
2.Delivery cost & timeline
3.Quote expiry date
Deadline: October
Thanks!
Danny Peddinti
PathnSitu Trading
The patch below does not apply to the 6.6-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>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 6eb350a2233100a283f882c023e5ad426d0ed63b
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101555-glimpse-gauntlet-5c2a@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 6eb350a2233100a283f882c023e5ad426d0ed63b Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx(a)linutronix.de>
Date: Wed, 13 Aug 2025 17:02:30 +0200
Subject: [PATCH] rseq: Protect event mask against membarrier IPI
rseq_need_restart() reads and clears task::rseq_event_mask with preemption
disabled to guard against the scheduler.
But membarrier() uses an IPI and sets the PREEMPT bit in the event mask
from the IPI, which leaves that RMW operation unprotected.
Use guard(irq) if CONFIG_MEMBARRIER is enabled to fix that.
Fixes: 2a36ab717e8f ("rseq/membarrier: Add MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ")
Signed-off-by: Thomas Gleixner <tglx(a)linutronix.de>
Reviewed-by: Boqun Feng <boqun.feng(a)gmail.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com>
Cc: stable(a)vger.kernel.org
diff --git a/include/linux/rseq.h b/include/linux/rseq.h
index bc8af3eb5598..1fbeb61babeb 100644
--- a/include/linux/rseq.h
+++ b/include/linux/rseq.h
@@ -7,6 +7,12 @@
#include <linux/preempt.h>
#include <linux/sched.h>
+#ifdef CONFIG_MEMBARRIER
+# define RSEQ_EVENT_GUARD irq
+#else
+# define RSEQ_EVENT_GUARD preempt
+#endif
+
/*
* Map the event mask on the user-space ABI enum rseq_cs_flags
* for direct mask checks.
@@ -41,9 +47,8 @@ static inline void rseq_handle_notify_resume(struct ksignal *ksig,
static inline void rseq_signal_deliver(struct ksignal *ksig,
struct pt_regs *regs)
{
- preempt_disable();
- __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask);
- preempt_enable();
+ scoped_guard(RSEQ_EVENT_GUARD)
+ __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask);
rseq_handle_notify_resume(ksig, regs);
}
diff --git a/kernel/rseq.c b/kernel/rseq.c
index b7a1ec327e81..2452b7366b00 100644
--- a/kernel/rseq.c
+++ b/kernel/rseq.c
@@ -342,12 +342,12 @@ static int rseq_need_restart(struct task_struct *t, u32 cs_flags)
/*
* Load and clear event mask atomically with respect to
- * scheduler preemption.
+ * scheduler preemption and membarrier IPIs.
*/
- preempt_disable();
- event_mask = t->rseq_event_mask;
- t->rseq_event_mask = 0;
- preempt_enable();
+ scoped_guard(RSEQ_EVENT_GUARD) {
+ event_mask = t->rseq_event_mask;
+ t->rseq_event_mask = 0;
+ }
return !!event_mask;
}
From: Celeste Liu <uwu(a)coelacanthus.name>
This issue was found by Runcheng Lu when develop HSCanT USB to CAN FD
converter[1]. The original developers may have only 3 interfaces
device to test so they write 3 here and wait for future change.
During the HSCanT development, we actually used 4 interfaces, so the
limitation of 3 is not enough now. But just increase one is not
future-proofed. Since the channel index type in gs_host_frame is u8,
just make canch[] become a flexible array with a u8 index, so it
naturally constraint by U8_MAX and avoid statically allocate 256
pointer for every gs_usb device.
[1]: https://github.com/cherry-embedded/HSCanT-hardware
Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices")
Reported-by: Runcheng Lu <runcheng.lu(a)hpmicro.com>
Cc: stable(a)vger.kernel.org
Reviewed-by: Vincent Mailhol <mailhol(a)kernel.org>
Signed-off-by: Celeste Liu <uwu(a)coelacanthus.name>
Link: https://patch.msgid.link/20250930-gs-usb-max-if-v5-1-863330bf6666@coelacant…
Signed-off-by: Marc Kleine-Budde <mkl(a)pengutronix.de>
---
drivers/net/can/usb/gs_usb.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index c9482d6e947b..9fb4cbbd6d6d 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -289,11 +289,6 @@ struct gs_host_frame {
#define GS_MAX_RX_URBS 30
#define GS_NAPI_WEIGHT 32
-/* Maximum number of interfaces the driver supports per device.
- * Current hardware only supports 3 interfaces. The future may vary.
- */
-#define GS_MAX_INTF 3
-
struct gs_tx_context {
struct gs_can *dev;
unsigned int echo_id;
@@ -324,7 +319,6 @@ struct gs_can {
/* usb interface struct */
struct gs_usb {
- struct gs_can *canch[GS_MAX_INTF];
struct usb_anchor rx_submitted;
struct usb_device *udev;
@@ -336,9 +330,11 @@ struct gs_usb {
unsigned int hf_size_rx;
u8 active_channels;
+ u8 channel_cnt;
unsigned int pipe_in;
unsigned int pipe_out;
+ struct gs_can *canch[] __counted_by(channel_cnt);
};
/* 'allocate' a tx context.
@@ -599,7 +595,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
}
/* device reports out of range channel id */
- if (hf->channel >= GS_MAX_INTF)
+ if (hf->channel >= parent->channel_cnt)
goto device_detach;
dev = parent->canch[hf->channel];
@@ -699,7 +695,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
/* USB failure take down all interfaces */
if (rc == -ENODEV) {
device_detach:
- for (rc = 0; rc < GS_MAX_INTF; rc++) {
+ for (rc = 0; rc < parent->channel_cnt; rc++) {
if (parent->canch[rc])
netif_device_detach(parent->canch[rc]->netdev);
}
@@ -1460,17 +1456,19 @@ static int gs_usb_probe(struct usb_interface *intf,
icount = dconf.icount + 1;
dev_info(&intf->dev, "Configuring for %u interfaces\n", icount);
- if (icount > GS_MAX_INTF) {
+ if (icount > type_max(parent->channel_cnt)) {
dev_err(&intf->dev,
"Driver cannot handle more that %u CAN interfaces\n",
- GS_MAX_INTF);
+ type_max(parent->channel_cnt));
return -EINVAL;
}
- parent = kzalloc(sizeof(*parent), GFP_KERNEL);
+ parent = kzalloc(struct_size(parent, canch, icount), GFP_KERNEL);
if (!parent)
return -ENOMEM;
+ parent->channel_cnt = icount;
+
init_usb_anchor(&parent->rx_submitted);
usb_set_intfdata(intf, parent);
@@ -1531,7 +1529,7 @@ static void gs_usb_disconnect(struct usb_interface *intf)
return;
}
- for (i = 0; i < GS_MAX_INTF; i++)
+ for (i = 0; i < parent->channel_cnt; i++)
if (parent->canch[i])
gs_destroy_candev(parent->canch[i]);
base-commit: 2c95a756e0cfc19af6d0b32b0c6cf3bada334998
--
2.51.0
The patch below does not apply to the 6.12-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>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 898374fdd7f06fa4c4a66e8be3135efeae6128d5
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025101547-demeanor-rectify-27be@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 898374fdd7f06fa4c4a66e8be3135efeae6128d5 Mon Sep 17 00:00:00 2001
From: Olga Kornievskaia <okorniev(a)redhat.com>
Date: Tue, 19 Aug 2025 14:04:02 -0400
Subject: [PATCH] nfsd: unregister with rpcbind when deleting a transport
When a listener is added, a part of creation of transport also registers
program/port with rpcbind. However, when the listener is removed,
while transport goes away, rpcbind still has the entry for that
port/type.
When deleting the transport, unregister with rpcbind when appropriate.
---v2 created a new xpt_flag XPT_RPCB_UNREG to mark TCP and UDP
transport and at xprt destroy send rpcbind unregister if flag set.
Suggested-by: Chuck Lever <chuck.lever(a)oracle.com>
Fixes: d093c9089260 ("nfsd: fix management of listener transports")
Cc: stable(a)vger.kernel.org
Signed-off-by: Olga Kornievskaia <okorniev(a)redhat.com>
Reviewed-by: Jeff Layton <jlayton(a)kernel.org>
Signed-off-by: Chuck Lever <chuck.lever(a)oracle.com>
diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index 369a89aea186..2b886f7eb295 100644
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -104,6 +104,9 @@ enum {
* it has access to. It is NOT counted
* in ->sv_tmpcnt.
*/
+ XPT_RPCB_UNREG, /* transport that needs unregistering
+ * with rpcbind (TCP, UDP) on destroy
+ */
};
/*
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 8b1837228799..b800d704d807 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -1014,6 +1014,19 @@ static void svc_delete_xprt(struct svc_xprt *xprt)
struct svc_serv *serv = xprt->xpt_server;
struct svc_deferred_req *dr;
+ /* unregister with rpcbind for when transport type is TCP or UDP.
+ */
+ if (test_bit(XPT_RPCB_UNREG, &xprt->xpt_flags)) {
+ struct svc_sock *svsk = container_of(xprt, struct svc_sock,
+ sk_xprt);
+ struct socket *sock = svsk->sk_sock;
+
+ if (svc_register(serv, xprt->xpt_net, sock->sk->sk_family,
+ sock->sk->sk_protocol, 0) < 0)
+ pr_warn("failed to unregister %s with rpcbind\n",
+ xprt->xpt_class->xcl_name);
+ }
+
if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags))
return;
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index c0d5a27ba674..7b90abc5cf0e 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -836,6 +836,7 @@ static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
/* data might have come in before data_ready set up */
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
+ set_bit(XPT_RPCB_UNREG, &svsk->sk_xprt.xpt_flags);
/* make sure we get destination address info */
switch (svsk->sk_sk->sk_family) {
@@ -1350,6 +1351,7 @@ static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
if (sk->sk_state == TCP_LISTEN) {
strcpy(svsk->sk_xprt.xpt_remotebuf, "listener");
set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
+ set_bit(XPT_RPCB_UNREG, &svsk->sk_xprt.xpt_flags);
sk->sk_data_ready = svc_tcp_listen_data_ready;
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
} else {