Merge tag 'driver-core-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-coregrafted

Pull driver core fixes from Danilo Krummrich:

 - Fix kernfs listxattr() not returning security xattr names (e.g.
   SELinux labels) when the kernfs node has no allocated kernfs_iattrs

 - Fix silent truncation of IRQ vector indices in the Rust PCI
   abstractions

 - Don't select OF from DRIVER_PE_KUNIT_TEST; skip the test when OF is
   disabled instead of silently enabling extra kernel functionality

 - Russ Weight is retiring from kernel development; update the Firmware
   Loader sysfs contact to the driver-core mailing list, add a CREDITS
   entry for Firmware Upload, and update MAINTAINERS accordingly

* tag 'driver-core-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core:
  MAINTAINERS: Remove Russ Weight from Firmware Loader
  CREDITS: Add CREDITS entry for Firmware Upload
  firmware_loader: Change contact for sysfs nodes
  rust: pci: reject IRQ vector indices that do not fit in u32
  kernfs: preserve security xattrs without allocating iattrs
  drivers: base: test: DRIVER_PE_KUNIT_TEST should not select OF

1 files changed, 147 insertions, 0 deletions

diff --git a/arch/x86/lib/msr.c b/arch/x86/lib/msr.c
new file mode 100644
index 000000000..dfdd1da89
--- /dev/null
+++ b/arch/x86/lib/msr.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/export.h>
+#include <linux/kvm_types.h>
+#include <linux/percpu.h>
+#include <linux/preempt.h>
+#include <asm/msr.h>
+#define CREATE_TRACE_POINTS
+#include <asm/msr-trace.h>
+
+struct msr __percpu *msrs_alloc(void)
+{
+	struct msr __percpu *msrs = NULL;
+
+	msrs = alloc_percpu(struct msr);
+	if (!msrs) {
+		pr_warn("%s: error allocating msrs\n", __func__);
+		return NULL;
+	}
+
+	return msrs;
+}
+EXPORT_SYMBOL(msrs_alloc);
+
+void msrs_free(struct msr __percpu *msrs)
+{
+	free_percpu(msrs);
+}
+EXPORT_SYMBOL(msrs_free);
+
+/**
+ * msr_read - Read an MSR with error handling
+ * @msr: MSR to read
+ * @m: value to read into
+ *
+ * It returns read data only on success, otherwise it doesn't change the output
+ * argument @m.
+ *
+ * Return: %0 for success, otherwise an error code
+ */
+static int msr_read(u32 msr, struct msr *m)
+{
+	int err;
+	u64 val;
+
+	err = rdmsrq_safe(msr, &val);
+	if (!err)
+		m->q = val;
+
+	return err;
+}
+
+/**
+ * msr_write - Write an MSR with error handling
+ *
+ * @msr: MSR to write
+ * @m: value to write
+ *
+ * Return: %0 for success, otherwise an error code
+ */
+static int msr_write(u32 msr, struct msr *m)
+{
+	return wrmsrq_safe(msr, m->q);
+}
+
+static inline int __flip_bit(u32 msr, u8 bit, bool set)
+{
+	struct msr m, m1;
+	int err = -EINVAL;
+
+	if (bit > 63)
+		return err;
+
+	err = msr_read(msr, &m);
+	if (err)
+		return err;
+
+	m1 = m;
+	if (set)
+		m1.q |=  BIT_64(bit);
+	else
+		m1.q &= ~BIT_64(bit);
+
+	if (m1.q == m.q)
+		return 0;
+
+	err = msr_write(msr, &m1);
+	if (err)
+		return err;
+
+	return 1;
+}
+
+/**
+ * msr_set_bit - Set @bit in a MSR @msr.
+ * @msr: MSR to write
+ * @bit: bit number to set
+ *
+ * Return:
+ * * < 0: An error was encountered.
+ * * = 0: Bit was already set.
+ * * > 0: Hardware accepted the MSR write.
+ */
+int msr_set_bit(u32 msr, u8 bit)
+{
+	return __flip_bit(msr, bit, true);
+}
+EXPORT_SYMBOL_FOR_KVM(msr_set_bit);
+
+/**
+ * msr_clear_bit - Clear @bit in a MSR @msr.
+ * @msr: MSR to write
+ * @bit: bit number to clear
+ *
+ * Return:
+ * * < 0: An error was encountered.
+ * * = 0: Bit was already cleared.
+ * * > 0: Hardware accepted the MSR write.
+ */
+int msr_clear_bit(u32 msr, u8 bit)
+{
+	return __flip_bit(msr, bit, false);
+}
+EXPORT_SYMBOL_FOR_KVM(msr_clear_bit);
+
+#ifdef CONFIG_TRACEPOINTS
+void do_trace_write_msr(u32 msr, u64 val, int failed)
+{
+	trace_write_msr(msr, val, failed);
+}
+EXPORT_SYMBOL(do_trace_write_msr);
+EXPORT_TRACEPOINT_SYMBOL(write_msr);
+
+void do_trace_read_msr(u32 msr, u64 val, int failed)
+{
+	trace_read_msr(msr, val, failed);
+}
+EXPORT_SYMBOL(do_trace_read_msr);
+EXPORT_TRACEPOINT_SYMBOL(read_msr);
+
+void do_trace_rdpmc(u32 msr, u64 val, int failed)
+{
+	trace_rdpmc(msr, val, failed);
+}
+EXPORT_SYMBOL(do_trace_rdpmc);
+EXPORT_TRACEPOINT_SYMBOL(rdpmc);
+
+#endif