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[RFC PATCH v2 0/6] RISC-V: Add dynamic TSO support

by Christoph Müllner

The upcoming RISC-V Ssdtso specification introduces a bit in the senvcfg CSR to switch the memory consistency model of user mode at run-time from RVWMO to TSO. The active consistency model can therefore be switched on a per-hart base and managed by the kernel on a per-process base. This patchset implements basic Ssdtso support and adds a prctl API on top so that user-space processes can switch to a stronger memory consistency model (than the kernel was written for) at run-time. The patchset also comes with a short documentation of the prctl API. This series is based on the third draft of the Ssdtso specification which can be found here: https://github.com/riscv/riscv-ssdtso/releases/tag/v1.0-draft3 Note, that the Ssdtso specification is in development state (i.e., not frozen or even ratified) which is also the reason why this series is marked as RFC. This series saw the following changes since v1: * Reordered/restructured patches * Fixed build issues * Addressed typos * Removed ability to switch TSO->WMO * Moved the state from per-thread to per-process * Reschedule all CPUs after switching * Some cleanups in the documentation * Adding compatibility with Ztso (spec change in draft 3) This patchset can also be found in this GitHub branch: https://github.com/cmuellner/linux/tree/ssdtso-v2 A QEMU implementation of DTSO can be found in this GitHub branch: https://github.com/cmuellner/qemu/tree/ssdtso-v2 Christoph Müllner (6): mm: Add dynamic memory consistency model switching uapi: prctl: Add new prctl call to set/get the memory consistency model RISC-V: Enable dynamic memory consistency model support with Ssdtso RISC-V: Implement prctl call to set/get the memory consistency model RISC-V: Expose Ssdtso via hwprobe API RISC-V: selftests: Add DTSO tests Documentation/arch/riscv/hwprobe.rst | 3 + .../mm/dynamic-memory-consistency-model.rst | 86 ++++++++++++++++ Documentation/mm/index.rst | 1 + arch/Kconfig | 14 +++ arch/riscv/Kconfig | 11 +++ arch/riscv/include/asm/csr.h | 1 + arch/riscv/include/asm/dtso.h | 97 +++++++++++++++++++ arch/riscv/include/asm/hwcap.h | 1 + arch/riscv/include/asm/processor.h | 7 ++ arch/riscv/include/asm/switch_to.h | 3 + arch/riscv/include/uapi/asm/hwprobe.h | 1 + arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/asm-offsets.c | 3 + arch/riscv/kernel/cpufeature.c | 1 + arch/riscv/kernel/dtso.c | 67 +++++++++++++ arch/riscv/kernel/sys_hwprobe.c | 2 + include/linux/sched.h | 5 + include/uapi/linux/prctl.h | 5 + kernel/sys.c | 12 +++ tools/testing/selftests/riscv/Makefile | 2 +- tools/testing/selftests/riscv/dtso/.gitignore | 1 + tools/testing/selftests/riscv/dtso/Makefile | 11 +++ tools/testing/selftests/riscv/dtso/dtso.c | 82 ++++++++++++++++ 23 files changed, 416 insertions(+), 1 deletion(-) create mode 100644 Documentation/mm/dynamic-memory-consistency-model.rst create mode 100644 arch/riscv/include/asm/dtso.h create mode 100644 arch/riscv/kernel/dtso.c create mode 100644 tools/testing/selftests/riscv/dtso/.gitignore create mode 100644 tools/testing/selftests/riscv/dtso/Makefile create mode 100644 tools/testing/selftests/riscv/dtso/dtso.c -- 2.43.0

1 week, 1 day

[PATCH v4 10/10] RISC-V: KVM: selftests: Add Zalasr extensions to get-reg-list test

by Xu Lu

The KVM RISC-V allows Zalasr extensions for Guest/VM so add these extensions to get-reg-list test. Signed-off-by: Xu Lu <luxu.kernel(a)bytedance.com> --- tools/testing/selftests/kvm/riscv/get-reg-list.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/testing/selftests/kvm/riscv/get-reg-list.c b/tools/testing/selftests/kvm/riscv/get-reg-list.c index a0b7dabb50406..3020e37f621ba 100644 --- a/tools/testing/selftests/kvm/riscv/get-reg-list.c +++ b/tools/testing/selftests/kvm/riscv/get-reg-list.c @@ -65,6 +65,7 @@ bool filter_reg(__u64 reg) case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZAAMO: case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZABHA: case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZACAS: + case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZALASR: case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZALRSC: case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZAWRS: case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_ZBA: @@ -517,6 +518,7 @@ static const char *isa_ext_single_id_to_str(__u64 reg_off) KVM_ISA_EXT_ARR(ZAAMO), KVM_ISA_EXT_ARR(ZABHA), KVM_ISA_EXT_ARR(ZACAS), + KVM_ISA_EXT_ARR(ZALASR), KVM_ISA_EXT_ARR(ZALRSC), KVM_ISA_EXT_ARR(ZAWRS), KVM_ISA_EXT_ARR(ZBA), @@ -1112,6 +1114,7 @@ KVM_ISA_EXT_SIMPLE_CONFIG(svvptc, SVVPTC); KVM_ISA_EXT_SIMPLE_CONFIG(zaamo, ZAAMO); KVM_ISA_EXT_SIMPLE_CONFIG(zabha, ZABHA); KVM_ISA_EXT_SIMPLE_CONFIG(zacas, ZACAS); +KVM_ISA_EXT_SIMPLE_CONFIG(zalasr, ZALASR); KVM_ISA_EXT_SIMPLE_CONFIG(zalrsc, ZALRSC); KVM_ISA_EXT_SIMPLE_CONFIG(zawrs, ZAWRS); KVM_ISA_EXT_SIMPLE_CONFIG(zba, ZBA); @@ -1187,6 +1190,7 @@ struct vcpu_reg_list *vcpu_configs[] = { &config_zabha, &config_zacas, &config_zalrsc, + &config_zalasr, &config_zawrs, &config_zba, &config_zbb, -- 2.20.1

1 week, 1 day

[PATCH v4 05/10] riscv: Apply Zalasr to smp_load_acquire/smp_store_release

by Xu Lu

Replace fence instructions with Zalasr instructions during smp_load_acquire() and smp_store_release() operations. |----------------------------------| | | __smp_store_release | | |-----------------------------| | | zalasr | !zalasr | | rl |-----------------------------| | | s{b|h|w|d}.rl | fence rw, w | | | | s{b|h|w|d} | |----------------------------------| | | __smp_load_acquire | | |-----------------------------| | | zalasr | !zalasr | | aq |-----------------------------| | | l{b|h|w|d}.aq | l{b|h|w|d} | | | | fence r, rw | |----------------------------------| Signed-off-by: Xu Lu <luxu.kernel(a)bytedance.com> --- arch/riscv/include/asm/barrier.h | 91 ++++++++++++++++++++++++++++---- 1 file changed, 80 insertions(+), 11 deletions(-) diff --git a/arch/riscv/include/asm/barrier.h b/arch/riscv/include/asm/barrier.h index b8c5726d86acb..9eaf94a028096 100644 --- a/arch/riscv/include/asm/barrier.h +++ b/arch/riscv/include/asm/barrier.h @@ -51,19 +51,88 @@ */ #define smp_mb__after_spinlock() RISCV_FENCE(iorw, iorw) -#define __smp_store_release(p, v) \ -do { \ - compiletime_assert_atomic_type(*p); \ - RISCV_FENCE(rw, w); \ - WRITE_ONCE(*p, v); \ +extern void __bad_size_call_parameter(void); + +#define __smp_store_release(p, v) \ +do { \ + typeof(p) __p = (p); \ + union { typeof(*p) __val; char __c[1]; } __u = \ + { .__val = (__force typeof(*p)) (v) }; \ + compiletime_assert_atomic_type(*p); \ + switch (sizeof(*p)) { \ + case 1: \ + asm volatile(ALTERNATIVE("fence rw, w;\t\nsb %0, 0(%1)\t\n", \ + SB_RL(%0, %1) "\t\nnop\t\n", \ + 0, RISCV_ISA_EXT_ZALASR, 1) \ + : : "r" (*(__u8 *)__u.__c), "r" (__p) \ + : "memory"); \ + break; \ + case 2: \ + asm volatile(ALTERNATIVE("fence rw, w;\t\nsh %0, 0(%1)\t\n", \ + SH_RL(%0, %1) "\t\nnop\t\n", \ + 0, RISCV_ISA_EXT_ZALASR, 1) \ + : : "r" (*(__u16 *)__u.__c), "r" (__p) \ + : "memory"); \ + break; \ + case 4: \ + asm volatile(ALTERNATIVE("fence rw, w;\t\nsw %0, 0(%1)\t\n", \ + SW_RL(%0, %1) "\t\nnop\t\n", \ + 0, RISCV_ISA_EXT_ZALASR, 1) \ + : : "r" (*(__u32 *)__u.__c), "r" (__p) \ + : "memory"); \ + break; \ + case 8: \ + asm volatile(ALTERNATIVE("fence rw, w;\t\nsd %0, 0(%1)\t\n", \ + SD_RL(%0, %1) "\t\nnop\t\n", \ + 0, RISCV_ISA_EXT_ZALASR, 1) \ + : : "r" (*(__u64 *)__u.__c), "r" (__p) \ + : "memory"); \ + break; \ + default: \ + __bad_size_call_parameter(); \ + break; \ + } \ } while (0) -#define __smp_load_acquire(p) \ -({ \ - typeof(*p) ___p1 = READ_ONCE(*p); \ - compiletime_assert_atomic_type(*p); \ - RISCV_FENCE(r, rw); \ - ___p1; \ +#define __smp_load_acquire(p) \ +({ \ + union { typeof(*p) __val; char __c[1]; } __u; \ + typeof(p) __p = (p); \ + compiletime_assert_atomic_type(*p); \ + switch (sizeof(*p)) { \ + case 1: \ + asm volatile(ALTERNATIVE("lb %0, 0(%1)\t\nfence r, rw\t\n", \ + LB_AQ(%0, %1) "\t\nnop\t\n", \ + 0, RISCV_ISA_EXT_ZALASR, 1) \ + : "=r" (*(__u8 *)__u.__c) : "r" (__p) \ + : "memory"); \ + break; \ + case 2: \ + asm volatile(ALTERNATIVE("lh %0, 0(%1)\t\nfence r, rw\t\n", \ + LH_AQ(%0, %1) "\t\nnop\t\n", \ + 0, RISCV_ISA_EXT_ZALASR, 1) \ + : "=r" (*(__u16 *)__u.__c) : "r" (__p) \ + : "memory"); \ + break; \ + case 4: \ + asm volatile(ALTERNATIVE("lw %0, 0(%1)\t\nfence r, rw\t\n", \ + LW_AQ(%0, %1) "\t\nnop\t\n", \ + 0, RISCV_ISA_EXT_ZALASR, 1) \ + : "=r" (*(__u32 *)__u.__c) : "r" (__p) \ + : "memory"); \ + break; \ + case 8: \ + asm volatile(ALTERNATIVE("ld %0, 0(%1)\t\nfence r, rw\t\n", \ + LD_AQ(%0, %1) "\t\nnop\t\n", \ + 0, RISCV_ISA_EXT_ZALASR, 1) \ + : "=r" (*(__u64 *)__u.__c) : "r" (__p) \ + : "memory"); \ + break; \ + default: \ + __bad_size_call_parameter(); \ + break; \ + } \ + __u.__val; \ }) #ifdef CONFIG_RISCV_ISA_ZAWRS -- 2.20.1

1 week, 1 day

[PATCH] selftests/bpf: fix qdisc kfunc declarations

by Sun Jian

The qdisc BPF selftests fail to build because qdisc-related kfuncs are used without proper declarations, and struct bpf_sk_buff_ptr is only introduced in a function prototype scope, triggering -Wvisibility and type mismatch errors under -Werror. Fix the build by: - adding a file-scope forward declaration for struct bpf_sk_buff_ptr - declaring qdisc kfuncs (bpf_qdisc_* and bpf_skb_get_hash/bpf_kfree_skb) as __ksym in the shared header - including required BPF headers in qdisc test progs Tested: make -C tools/testing/selftests/bpf OUTPUT=/tmp/selftests-bpf \ /tmp/selftests-bpf/bpf_qdisc_fifo.bpf.o \ /tmp/selftests-bpf/bpf_qdisc_fq.bpf.o \ /tmp/selftests-bpf/bpf_qdisc_fail__incompl_ops.bpf.o Signed-off-by: Sun Jian <sun.jian.kdev(a)gmail.com> --- .../selftests/bpf/progs/bpf_qdisc_common.h | 17 +++++++++++++++++ .../bpf/progs/bpf_qdisc_fail__incompl_ops.c | 4 ++++ .../selftests/bpf/progs/bpf_qdisc_fifo.c | 4 ++++ .../testing/selftests/bpf/progs/bpf_qdisc_fq.c | 1 + 4 files changed, 26 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/bpf_qdisc_common.h b/tools/testing/selftests/bpf/progs/bpf_qdisc_common.h index 3754f581b328..bed2294c35f9 100644 --- a/tools/testing/selftests/bpf/progs/bpf_qdisc_common.h +++ b/tools/testing/selftests/bpf/progs/bpf_qdisc_common.h @@ -3,6 +3,9 @@ #ifndef _BPF_QDISC_COMMON_H #define _BPF_QDISC_COMMON_H +#include <vmlinux.h> +#include <bpf/bpf_helpers.h> + #define NET_XMIT_SUCCESS 0x00 #define NET_XMIT_DROP 0x01 /* skb dropped */ #define NET_XMIT_CN 0x02 /* congestion notification */ @@ -14,6 +17,20 @@ struct bpf_sk_buff_ptr; +/* kfunc declarations provided via vmlinux BTF */ +extern void bpf_qdisc_skb_drop(struct sk_buff *skb, + struct bpf_sk_buff_ptr *to_free) __ksym; + +extern void bpf_qdisc_bstats_update(struct Qdisc *sch, + const struct sk_buff *skb) __ksym; + +extern void bpf_qdisc_watchdog_schedule(struct Qdisc *sch, + u64 expire, u64 delta_ns) __ksym; + +extern __u32 bpf_skb_get_hash(struct sk_buff *skb) __ksym; + +extern void bpf_kfree_skb(struct sk_buff *skb) __ksym; + static struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) { return (struct qdisc_skb_cb *)skb->cb; diff --git a/tools/testing/selftests/bpf/progs/bpf_qdisc_fail__incompl_ops.c b/tools/testing/selftests/bpf/progs/bpf_qdisc_fail__incompl_ops.c index f188062ed730..8f9b2d2cb9a1 100644 --- a/tools/testing/selftests/bpf/progs/bpf_qdisc_fail__incompl_ops.c +++ b/tools/testing/selftests/bpf/progs/bpf_qdisc_fail__incompl_ops.c @@ -1,6 +1,10 @@ // SPDX-License-Identifier: GPL-2.0 #include <vmlinux.h> + +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + #include "bpf_experimental.h" #include "bpf_qdisc_common.h" diff --git a/tools/testing/selftests/bpf/progs/bpf_qdisc_fifo.c b/tools/testing/selftests/bpf/progs/bpf_qdisc_fifo.c index 1de2be3e370b..524d3ae2c9a1 100644 --- a/tools/testing/selftests/bpf/progs/bpf_qdisc_fifo.c +++ b/tools/testing/selftests/bpf/progs/bpf_qdisc_fifo.c @@ -1,6 +1,10 @@ // SPDX-License-Identifier: GPL-2.0 #include <vmlinux.h> + +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + #include "bpf_experimental.h" #include "bpf_qdisc_common.h" diff --git a/tools/testing/selftests/bpf/progs/bpf_qdisc_fq.c b/tools/testing/selftests/bpf/progs/bpf_qdisc_fq.c index 1a3233a275c7..dd47820fa230 100644 --- a/tools/testing/selftests/bpf/progs/bpf_qdisc_fq.c +++ b/tools/testing/selftests/bpf/progs/bpf_qdisc_fq.c @@ -35,6 +35,7 @@ #include <vmlinux.h> #include <errno.h> #include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> #include "bpf_experimental.h" #include "bpf_qdisc_common.h" -- 2.43.0

1 week, 1 day

[PATCH net-next v3 0/8] selftest: Extend tun/virtio coverage for GSO over UDP tunnel

by Xu Du

The primary goal is to add test validation for GSO when operating over UDP tunnels, a scenario which is not currently covered. The design strategy is to extend the existing tun/tap testing infrastructure to support this new use-case, rather than introducing a new or parallel framework. This allows for better integration and re-use of existing test logic. --- v2 -> v3: - Re-send the patch series becasue Patchwork don't update them v2: https://lore.kernel.org/all/cover.1767074545.git.xudu@redhat.com/ - Addresse sporadic failures due to too early send. - Refactor environment address assign helper function. - Fix incorrect argument passing in build packet functions. v1: https://lore.kernel.org/netdev/cover.1763345426.git.xudu@redhat.com/ Xu Du (8): selftest: tun: Format tun.c existing code selftest: tun: Introduce tuntap_helpers.h header for TUN/TAP testing selftest: tun: Refactor tun_delete to use tuntap_helpers selftest: tap: Refactor tap test to use tuntap_helpers selftest: tun: Add helpers for GSO over UDP tunnel selftest: tun: Add test for sending gso packet into tun selftest: tun: Add test for receiving gso packet from tun selftest: tun: Add test data for success and failure paths tools/testing/selftests/net/tap.c | 287 +----- tools/testing/selftests/net/tun.c | 917 ++++++++++++++++++- tools/testing/selftests/net/tuntap_helpers.h | 608 ++++++++++++ 3 files changed, 1530 insertions(+), 282 deletions(-) create mode 100644 tools/testing/selftests/net/tuntap_helpers.h base-commit: 7b8e9264f55a9c320f398e337d215e68cca50131 -- 2.49.0

1 week, 1 day

[PATCH net v3] selftests: mptcp: Mark xerror and die_perror __noreturn

by Ankit Khushwaha

Compiler reports potential uses of uninitialized variables in mptcp_connect.c when xerror() is called from failure paths. mptcp_connect.c:1262:11: warning: variable 'raw_addr' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] xerror() terminates execution by calling exit(), but it is not visible to the compiler & assumes control flow may continue past the call. Annotate xerror() with __noreturn so the compiler can correctly reason about control flow and avoid false-positive uninitialized variable warnings. Signed-off-by: Ankit Khushwaha <ankitkhushwaha.linux(a)gmail.com> --- changelog: v3: - also annotate 'die_perror()' with __noreturn - add CFLAGS at top of makefile - target this patch to net instead of net-next as suggested by Matthieu v2: https://lore.kernel.org/all/20251129043808.16714-1-ankitkhushwaha.linux@gma… - annotate 'xerror()' with __noreturn - remove defining 'raw_addr' to NULL v1: https://lore.kernel.org/all/20251126163046.58615-1-ankitkhushwaha.linux@gma… --- tools/testing/selftests/net/mptcp/Makefile | 1 + tools/testing/selftests/net/mptcp/mptcp_connect.c | 3 ++- tools/testing/selftests/net/mptcp/mptcp_diag.c | 3 ++- tools/testing/selftests/net/mptcp/mptcp_inq.c | 5 +++-- tools/testing/selftests/net/mptcp/mptcp_sockopt.c | 5 +++-- 5 files changed, 11 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/net/mptcp/Makefile b/tools/testing/selftests/net/mptcp/Makefile index 15d144a25d82..4dd6278cd3dd 100644 --- a/tools/testing/selftests/net/mptcp/Makefile +++ b/tools/testing/selftests/net/mptcp/Makefile @@ -3,6 +3,7 @@ top_srcdir = ../../../../.. CFLAGS += -Wall -Wl,--no-as-needed -O2 -g -I$(top_srcdir)/usr/include $(KHDR_INCLUDES) +CFLAGS += -I$(top_srcdir)/tools/include TEST_PROGS := \ diag.sh \ diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.c b/tools/testing/selftests/net/mptcp/mptcp_connect.c index 404a77bf366a..10f6f99cfd4e 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_connect.c +++ b/tools/testing/selftests/net/mptcp/mptcp_connect.c @@ -33,6 +33,7 @@ #include <linux/tcp.h> #include <linux/time_types.h> #include <linux/sockios.h> +#include <linux/compiler.h> extern int optind; @@ -140,7 +141,7 @@ static void die_usage(void) exit(1); } -static void xerror(const char *fmt, ...) +static void __noreturn xerror(const char *fmt, ...) { va_list ap; diff --git a/tools/testing/selftests/net/mptcp/mptcp_diag.c b/tools/testing/selftests/net/mptcp/mptcp_diag.c index e084796e804d..8e0b1b8d84b6 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_diag.c +++ b/tools/testing/selftests/net/mptcp/mptcp_diag.c @@ -5,6 +5,7 @@ #include <linux/rtnetlink.h> #include <linux/inet_diag.h> #include <linux/netlink.h> +#include <linux/compiler.h> #include <sys/socket.h> #include <netinet/in.h> #include <linux/tcp.h> @@ -87,7 +88,7 @@ enum { #define rta_getattr(type, value) (*(type *)RTA_DATA(value)) -static void die_perror(const char *msg) +static void __noreturn die_perror(const char *msg) { perror(msg); exit(1); diff --git a/tools/testing/selftests/net/mptcp/mptcp_inq.c b/tools/testing/selftests/net/mptcp/mptcp_inq.c index 8e8f6441ad8b..5716998da192 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_inq.c +++ b/tools/testing/selftests/net/mptcp/mptcp_inq.c @@ -28,6 +28,7 @@ #include <linux/tcp.h> #include <linux/sockios.h> +#include <linux/compiler.h> #ifndef IPPROTO_MPTCP #define IPPROTO_MPTCP 262 @@ -40,7 +41,7 @@ static int pf = AF_INET; static int proto_tx = IPPROTO_MPTCP; static int proto_rx = IPPROTO_MPTCP; -static void die_perror(const char *msg) +static void __noreturn die_perror(const char *msg) { perror(msg); exit(1); @@ -52,7 +53,7 @@ static void die_usage(int r) exit(r); } -static void xerror(const char *fmt, ...) +static void __noreturn xerror(const char *fmt, ...) { va_list ap; diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c index 286164f7246e..b6e58d936ebe 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c +++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c @@ -25,6 +25,7 @@ #include <netinet/in.h> #include <linux/tcp.h> +#include <linux/compiler.h> static int pf = AF_INET; @@ -127,7 +128,7 @@ struct so_state { #define MIN(a, b) ((a) < (b) ? (a) : (b)) #endif -static void die_perror(const char *msg) +static void __noreturn die_perror(const char *msg) { perror(msg); exit(1); @@ -139,7 +140,7 @@ static void die_usage(int r) exit(r); } -static void xerror(const char *fmt, ...) +static void __noreturn xerror(const char *fmt, ...) { va_list ap; -- 2.52.0

1 week, 1 day

[PATCH 00/21] vfio/pci: Base support to preserve a VFIO device file across Live Update

by David Matlack

This series adds the base support to preserve a VFIO device file across a Live Update. "Base support" means that this allows userspace to safetly preserve a VFIO device file with LIVEUPDATE_SESSION_PRESERVE_FD and retrieve a preserved VFIO device file with LIVEUPDATE_SESSION_RETRIEVE_FD, but the device itself is not preserved in a fully running state across Live Update. This series unblocks 2 parallel but related streams of work: - iommufd preservation across Live Update. This work spans iommufd, the IOMMU subsystem, and IOMMU drivers [1] - Preservation of VFIO device state across Live Update (config space, BAR addresses, power state, SR-IOV state, etc.). This work spans both VFIO and the core PCI subsystem. While we need all of the above to fully preserve a VFIO device across a Live Update without disrupting the workload on the device, this series aims to be functional and safe enough to merge as the first incremental step toward that goal. Areas for Discussion -------------------- BDF Stability across Live Update The PCI support for tracking preserved devices across a Live Update to prevent auto-probing relies on PCI segment numbers and BDFs remaining stable. For now I have disallowed VFs, as the BDFs assigned to VFs can vary depending on how the kernel chooses to allocate bus numbers. For non-VFs I am wondering if there is any more needed to ensure BDF stability across Live Update. While we would like to support many different systems and configurations in due time (including preserving VFs), I'd like to keep this first serses constrained to simple use-cases. FLB Locking I don't see a way to properly synchronize pci_flb_finish() with pci_liveupdate_incoming_is_preserved() since the incoming FLB mutex is dropped by liveupdate_flb_get_incoming() when it returns the pointer to the object, and taking pci_flb_incoming_lock in pci_flb_finish() could result in a deadlock due to reversing the lock ordering. FLB Retrieving The first patch of this series includes a fix to prevent an FLB from being retrieved again it is finished. I am wondering if this is the right approach or if subsystems are expected to stop calling liveupdate_flb_get_incoming() after an FLB is finished. Testing ------- The patches at the end of this series provide comprehensive selftests for the new code added by this series. The selftests have been validated in both a VM environment using a virtio-net PCIe device, and in a baremetal environment on an Intel EMR server with an Intel DSA device. Here is an example of how to run the new selftests: vfio_pci_liveupdate_uapi_test: $ tools/testing/selftests/vfio/scripts/setup.sh 0000:00:04.0 $ tools/testing/selftests/vfio/vfio_pci_liveupdate_uapi_test 0000:00:04.0 $ tools/testing/selftests/vfio/scripts/cleanup.sh vfio_pci_liveupdate_kexec_test: $ tools/testing/selftests/vfio/scripts/setup.sh 0000:00:04.0 $ tools/testing/selftests/vfio/vfio_pci_liveupdate_kexec_test --stage 1 0000:00:04.0 $ kexec [...] # NOTE: distro-dependent $ tools/testing/selftests/vfio/scripts/setup.sh 0000:00:04.0 $ tools/testing/selftests/vfio/vfio_pci_liveupdate_kexec_test --stage 2 0000:00:04.0 $ tools/testing/selftests/vfio/scripts/cleanup.sh Dependencies ------------ This series was constructed on top of several in-flight series and on top of mm-nonmm-unstable [2]. +-- This series | +-- [PATCH v2 00/18] vfio: selftests: Support for multi-device tests | https://lore.kernel.org/kvm/20251112192232.442761-1-dmatlack@google.com/ | +-- [PATCH v3 0/4] vfio: selftests: update DMA mapping tests to use queried IOVA ranges | https://lore.kernel.org/kvm/20251111-iova-ranges-v3-0-7960244642c5@fb.com/ | +-- [PATCH v8 0/2] Live Update: File-Lifecycle-Bound (FLB) State | https://lore.kernel.org/linux-mm/20251125225006.3722394-1-pasha.tatashin@so… | +-- [PATCH v8 00/18] Live Update Orchestrator | https://lore.kernel.org/linux-mm/20251125165850.3389713-1-pasha.tatashin@so… | To simplify checking out the code, this series can be found on GitHub: https://github.com/dmatlack/linux/tree/liveupdate/vfio/cdev/v1 Changelog --------- v1: - Rebase series on top of LUOv8 and VFIO selftests improvements - Drop commits to preserve config space fields across Live Update. These changes require changes to the PCI layer. For exmaple, preserving rbars could lead to an inconsistent device state until device BARs addresses are preserved across Live Update. - Drop commits to preserve Bus Master Enable on the device. There's no reason to preserve this until iommufd preservation is fully working. Furthermore, preserving Bus Master Enable could lead to memory corruption when the device if the device is bound to the default identity-map domain after Live Update. - Drop commits to preserve saved PCI state. This work is not needed until we are ready to preserve the device's config space, and requires more thought to make the PCI state data layout ABI-friendly. - Add support to skip auto-probing devices that are preserved by VFIO to avoid them getting bound to a different driver by the next kernel. - Restrict device preservation further (no VFs, no intel-graphics). - Various refactoring and small edits to improve readability and eliminate code duplication. rfc: https://lore.kernel.org/kvm/20251018000713.677779-1-vipinsh@google.com/ Cc: Saeed Mahameed <saeedm(a)nvidia.com> Cc: Adithya Jayachandran <ajayachandra(a)nvidia.com> Cc: Jason Gunthorpe <jgg(a)nvidia.com> Cc: Parav Pandit <parav(a)nvidia.com> Cc: Leon Romanovsky <leonro(a)nvidia.com> Cc: William Tu <witu(a)nvidia.com> Cc: Jacob Pan <jacob.pan(a)linux.microsoft.com> Cc: Lukas Wunner <lukas(a)wunner.de> Cc: Pasha Tatashin <pasha.tatashin(a)soleen.com> Cc: Mike Rapoport <rppt(a)kernel.org> Cc: Pratyush Yadav <pratyush(a)kernel.org> Cc: Samiullah Khawaja <skhawaja(a)google.com> Cc: Chris Li <chrisl(a)kernel.org> Cc: Josh Hilke <jrhilke(a)google.com> Cc: David Rientjes <rientjes(a)google.com> [1] https://lore.kernel.org/linux-iommu/20250928190624.3735830-1-skhawaja@googl… [2] https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/log/?h=mm-nonmm… David Matlack (12): liveupdate: luo_flb: Prevent retrieve() after finish() PCI: Add API to track PCI devices preserved across Live Update PCI: Require driver_override for incoming Live Update preserved devices vfio/pci: Notify PCI subsystem about devices preserved across Live Update vfio: Enforce preserved devices are retrieved via LIVEUPDATE_SESSION_RETRIEVE_FD vfio/pci: Store Live Update state in struct vfio_pci_core_device vfio: selftests: Add Makefile support for TEST_GEN_PROGS_EXTENDED vfio: selftests: Add vfio_pci_liveupdate_uapi_test vfio: selftests: Expose iommu_modes to tests vfio: selftests: Expose low-level helper routines for setting up struct vfio_pci_device vfio: selftests: Verify that opening VFIO device fails during Live Update vfio: selftests: Add continuous DMA to vfio_pci_liveupdate_kexec_test Vipin Sharma (9): vfio/pci: Register a file handler with Live Update Orchestrator vfio/pci: Preserve vfio-pci device files across Live Update vfio/pci: Retrieve preserved device files after Live Update vfio/pci: Skip reset of preserved device after Live Update selftests/liveupdate: Move luo_test_utils.* into a reusable library selftests/liveupdate: Add helpers to preserve/retrieve FDs vfio: selftests: Build liveupdate library in VFIO selftests vfio: selftests: Initialize vfio_pci_device using a VFIO cdev FD vfio: selftests: Add vfio_pci_liveupdate_kexec_test MAINTAINERS | 1 + drivers/pci/Makefile | 1 + drivers/pci/liveupdate.c | 248 ++++++++++++++++ drivers/pci/pci-driver.c | 12 +- drivers/vfio/device_cdev.c | 25 +- drivers/vfio/group.c | 9 + drivers/vfio/pci/Makefile | 1 + drivers/vfio/pci/vfio_pci.c | 11 +- drivers/vfio/pci/vfio_pci_core.c | 23 +- drivers/vfio/pci/vfio_pci_liveupdate.c | 278 ++++++++++++++++++ drivers/vfio/pci/vfio_pci_priv.h | 16 + drivers/vfio/vfio.h | 13 - drivers/vfio/vfio_main.c | 22 +- include/linux/kho/abi/pci.h | 53 ++++ include/linux/kho/abi/vfio_pci.h | 45 +++ include/linux/liveupdate.h | 3 + include/linux/pci.h | 38 +++ include/linux/vfio.h | 51 ++++ include/linux/vfio_pci_core.h | 7 + kernel/liveupdate/luo_flb.c | 4 + tools/testing/selftests/liveupdate/.gitignore | 1 + tools/testing/selftests/liveupdate/Makefile | 14 +- .../include/libliveupdate.h} | 11 +- .../selftests/liveupdate/lib/libliveupdate.mk | 20 ++ .../{luo_test_utils.c => lib/liveupdate.c} | 43 ++- .../selftests/liveupdate/luo_kexec_simple.c | 2 +- .../selftests/liveupdate/luo_multi_session.c | 2 +- tools/testing/selftests/vfio/Makefile | 23 +- .../vfio/lib/include/libvfio/iommu.h | 2 + .../lib/include/libvfio/vfio_pci_device.h | 8 + tools/testing/selftests/vfio/lib/iommu.c | 4 +- .../selftests/vfio/lib/vfio_pci_device.c | 60 +++- .../vfio/vfio_pci_liveupdate_kexec_test.c | 255 ++++++++++++++++ .../vfio/vfio_pci_liveupdate_uapi_test.c | 93 ++++++ 34 files changed, 1313 insertions(+), 86 deletions(-) create mode 100644 drivers/pci/liveupdate.c create mode 100644 drivers/vfio/pci/vfio_pci_liveupdate.c create mode 100644 include/linux/kho/abi/pci.h create mode 100644 include/linux/kho/abi/vfio_pci.h rename tools/testing/selftests/liveupdate/{luo_test_utils.h => lib/include/libliveupdate.h} (80%) create mode 100644 tools/testing/selftests/liveupdate/lib/libliveupdate.mk rename tools/testing/selftests/liveupdate/{luo_test_utils.c => lib/liveupdate.c} (89%) create mode 100644 tools/testing/selftests/vfio/vfio_pci_liveupdate_kexec_test.c create mode 100644 tools/testing/selftests/vfio/vfio_pci_liveupdate_uapi_test.c -- 2.52.0.487.g5c8c507ade-goog

1 week, 1 day

[PATCH] kselftest/arm64: Support FORCE_TARGETS

by Mark Brown

The top level kselftest Makefile supports an option FORCE_TARGETS which causes any failures during the build to be propagated to the exit status of the top level make, useful during build testing. Currently the recursion done by the arm64 selftests ignores this option, meaning arm64 failures are not reported via this mechanism. Add the logic to implement FORCE_TARGETS so that it works for arm64. Signed-off-by: Mark Brown <broonie(a)kernel.org> --- tools/testing/selftests/arm64/Makefile | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/arm64/Makefile b/tools/testing/selftests/arm64/Makefile index c4c72ee2ef55..e456f3b62fa1 100644 --- a/tools/testing/selftests/arm64/Makefile +++ b/tools/testing/selftests/arm64/Makefile @@ -30,13 +30,15 @@ all: @for DIR in $(ARM64_SUBTARGETS); do \ BUILD_TARGET=$(OUTPUT)/$$DIR; \ mkdir -p $$BUILD_TARGET; \ - make OUTPUT=$$BUILD_TARGET -C $$DIR $@; \ + make OUTPUT=$$BUILD_TARGET -C $$DIR $@ \ + $(if $(FORCE_TARGETS),|| exit); \ done install: all @for DIR in $(ARM64_SUBTARGETS); do \ BUILD_TARGET=$(OUTPUT)/$$DIR; \ - make OUTPUT=$$BUILD_TARGET -C $$DIR $@; \ + make OUTPUT=$$BUILD_TARGET -C $$DIR $@ \ + $(if $(FORCE_TARGETS),|| exit); \ done run_tests: all --- base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8 change-id: 20251219-kselftest-arm64-force-targets-2ba8cebd1748 Best regards, -- Mark Brown <broonie(a)kernel.org>

1 week, 1 day

[PATCH 0/9] vDSO: Provide clock_getres_time64() where applicable

by Thomas Weißschuh

For consistency with __vdso_clock_gettime64() there should also be a 64-bit variant of clock_getres(). This will allow the extension of CONFIG_COMPAT_32BIT_TIME to the vDSO and finally the removal of 32-bit time types from the kernel and UAPI. Signed-off-by: Thomas Weißschuh <thomas.weissschuh(a)linutronix.de> --- Thomas Weißschuh (9): vdso: Add prototype for __vdso_clock_getres_time64() selftests: vDSO: vdso_config: Add configurations for clock_getres_time64() selftests: vDSO: vdso_test_abi: Use UAPI system call numbers selftests: vDSO: vdso_test_abi: Add test for clock_getres_time64() x86/vdso: Provide clock_getres_time64() for x86-32 ARM: VDSO: also patch out __vdso_clock_getres() if unavailable ARM: VDSO: provide clock_getres_time64() arm64: vdso32: Provide clock_getres_time64() MIPS: vdso: Provide getres_time64() for 32-bit ABIs arch/arm/kernel/vdso.c | 2 + arch/arm/vdso/vdso.lds.S | 1 + arch/arm/vdso/vgettimeofday.c | 6 +++ arch/arm64/kernel/vdso32/vdso.lds.S | 1 + arch/arm64/kernel/vdso32/vgettimeofday.c | 6 +++ arch/mips/vdso/vdso.lds.S | 1 + arch/mips/vdso/vgettimeofday.c | 6 +++ arch/x86/entry/vdso/vclock_gettime.c | 8 ++++ arch/x86/entry/vdso/vdso32/vdso32.lds.S | 1 + include/vdso/gettime.h | 1 + tools/testing/selftests/vDSO/vdso_config.h | 4 +- tools/testing/selftests/vDSO/vdso_test_abi.c | 55 +++++++++++++++++++++++++++- 12 files changed, 89 insertions(+), 3 deletions(-) --- base-commit: 15a11f3ffb629cbbf6efd272239c04a9eb3180e2 change-id: 20251120-vdso-compat-time32-f4684ff250ba Best regards, -- Thomas Weißschuh <thomas.weissschuh(a)linutronix.de>

1 week, 1 day

[PATCH 0/4] Various mm kselftests improvements/fixes

by Kevin Brodsky

A few improvements/fixes for the mm kselftests: - Patch 1-2 extend support for more build configurations: out-of-tree $KDIR, cross-compilation, etc. - Patch 3-4 fix issues in the pagemap_ioctl tests, most importantly that it does not report failures: ./run_kselftests.sh would report OK even if some pagemap_ioctl tests fail. That's probably why the issue in patch 3 went unnoticed. --- Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: David Hildenbrand <david(a)kernel.org> Cc: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Cc: Mark Brown <broonie(a)kernel.org> Cc: Ryan Roberts <ryan.roberts(a)arm.com> Cc: Shuah Khan <shuah(a)kernel.org> --- Kevin Brodsky (4): selftests/mm: remove flaky header check selftests/mm: pass down full CC and CFLAGS to check_config.sh selftests/mm: fix faulting-in code in pagemap_ioctl test selftests/mm: fix exit code in pagemap_ioctl tools/testing/selftests/mm/Makefile | 6 +----- tools/testing/selftests/mm/check_config.sh | 3 +-- tools/testing/selftests/mm/pagemap_ioctl.c | 12 ++++++------ 3 files changed, 8 insertions(+), 13 deletions(-) base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8 -- 2.51.2

1 week, 1 day

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