May 2025 - Linux-kselftest-mirror

[PATCH] selftests: Suppress unused variable warning

by Chen Linxuan

When running `make kselftest`, the following compilation warning was encountered: mount-notify_test.c: In function ‘fanotify_rmdir’: mount-notify_test.c:490:17: warning: ignoring return value of ‘chdir’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 490 | chdir("/"); | ^~~~~~~~~~ This patch addresses the warning by explicitly suppressing the unused result of the `chdir` function. Signed-off-by: Chen Linxuan <chenlinxuan(a)uniontech.com> --- .../selftests/filesystems/mount-notify/mount-notify_test.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c index 59a71f22fb118..de847e2b12017 100644 --- a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c +++ b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c @@ -487,7 +487,9 @@ TEST_F(fanotify, rmdir) ASSERT_GE(ret, 0); if (ret == 0) { - chdir("/"); + // Suppress -Wunused-result + // Ref: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66425#c34 + (void) !chdir("/"); unshare(CLONE_NEWNS); mount("", "/", NULL, MS_REC|MS_PRIVATE, NULL); umount2("/a", MNT_DETACH); -- 2.43.0

6 months

1
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0 0

[PATCH net-next v14 0/9] Device memory TCP TX

by Mina Almasry

v14: https://lore.kernel.org/netdev/20250429032645.363766-1-almasrymina@google.c… === Picked up acks from Paolo, and addressed feedback from Paolo and Jakub. Changelog: - Fix issue in patch 4 where sockc_valid == false but err is overwritten. - Addressed nits. v13: https://lore.kernel.org/netdev/20250425204743.617260-1-almasrymina@google.c… === Changelog: - Fix unneeded error label pointed out by Christoph, and addressed nitpick. v12: https://lore.kernel.org/netdev/20250423031117.907681-1-almasrymina@google.c… ==== No changes in v12, just restored the selftests patch I accidentally dropped in v11 v11: https://lore.kernel.org/netdev/20250423031117.907681-1-almasrymina@google.c… ==== Addressed a couple of nits and collected Acked-by from Harshitha (thanks!) v10: https://lore.kernel.org/netdev/20250417231540.2780723-1-almasrymina@google.… ==== Addressed comments following conversations with Pavel, Stan, and Harshitha. Thank you guys for the reviews again. Overall minor changes: Changelog: - Check for !niov->pp in io_zcrx_recv_frag, just in case we end up with a TX niov in that path (Pavel). - Fix locking case in !netif_device_present (Jakub/Stan). v9: https://lore.kernel.org/netdev/20250415224756.152002-1-almasrymina@google.c… === Changelog: - Use priv->bindings list instead of sock_bindings_list. This was missed during the rebase as the bindings have been updated to use priv->bindings recently (thanks Stan!) v8: https://lore.kernel.org/netdev/20250308214045.1160445-1-almasrymina@google.… === Only address minor comments on V7 Changelog: - Use netdev locking instead of rtnl_locking to match rx path. - Now that iouring zcrx is in net-next, use NET_IOV_IOURING instead of NET_IOV_UNSPECIFIED. - Post send binding to net_devmem_dmabuf_bindings after it's been fully initialized (Stan). v7: https://lore.kernel.org/netdev/20250227041209.2031104-1-almasrymina@google.… === Changelog: - Check the dmabuf net_iov binding belongs to the device the TX is going out on. (Jakub) - Provide detailed inspection of callsites of __skb_frag_ref/skb_page_unref in patch 2's changelog (Jakub) v6: https://lore.kernel.org/netdev/20250222191517.743530-1-almasrymina@google.c… === v6 has no major changes. Addressed a few issues from Paolo and David, and collected Acks from Stan. Thank you everyone for the review! Changes: - retain behavior to process MSG_FASTOPEN even if the provided cmsg is invalid (Paolo). - Rework the freeing of tx_vec slightly (it now has its own err label). (Paolo). - Squash the commit that makes dmabuf unbinding scheduled work into the same one which implements the TX path so we don't run into future errors on bisecting (Paolo). - Fix/add comments to explain how dmabuf binding refcounting works (David). v5: https://lore.kernel.org/netdev/20250220020914.895431-1-almasrymina@google.c… === v5 has no major changes; it clears up the relatively minor issues pointed out to in v4, and rebases the series on top of net-next to resolve the conflict with a patch that raced to the tree. It also collects the review tags from v4. Changes: - Rebase to net-next - Fix issues in selftest (Stan). - Address comments in the devmem and netmem driver docs (Stan and Bagas) - Fix zerocopy_fill_skb_from_devmem return error code (Stan). v4: https://lore.kernel.org/netdev/20250203223916.1064540-1-almasrymina@google.… === v4 mainly addresses the critical driver support issue surfaced in v3 by Paolo and Stan. Drivers aiming to support netmem_tx should make sure not to pass the netmem dma-addrs to the dma-mapping APIs, as these dma-addrs may come from dma-bufs. Additionally other feedback from v3 is addressed. Major changes: - Add helpers to handle netmem dma-addrs. Add GVE support for netmem_tx. - Fix binding->tx_vec not being freed on error paths during the tx binding. - Add a minimal devmem_tx test to devmem.py. - Clean up everything obsolete from the cover letter (Paolo). v3: https://patchwork.kernel.org/project/netdevbpf/list/?series=929401&state=* === Address minor comments from RFCv2 and fix a few build warnings and ynl-regen issues. No major changes. RFC v2: https://patchwork.kernel.org/project/netdevbpf/list/?series=920056&state=* ======= RFC v2 addresses much of the feedback from RFC v1. I plan on sending something close to this as net-next reopens, sending it slightly early to get feedback if any. Major changes: -------------- - much improved UAPI as suggested by Stan. We now interpret the iov_base of the passed in iov from userspace as the offset into the dmabuf to send from. This removes the need to set iov.iov_base = NULL which may be confusing to users, and enables us to send multiple iovs in the same sendmsg() call. ncdevmem and the docs show a sample use of that. - Removed the duplicate dmabuf iov_iter in binding->iov_iter. I think this is good improvment as it was confusing to keep track of 2 iterators for the same sendmsg, and mistracking both iterators caused a couple of bugs reported in the last iteration that are now resolved with this streamlining. - Improved test coverage in ncdevmem. Now multiple sendmsg() are tested, and sending multiple iovs in the same sendmsg() is tested. - Fixed issue where dmabuf unmapping was happening in invalid context (Stan). ==================================================================== The TX path had been dropped from the Device Memory TCP patch series post RFCv1 [1], to make that series slightly easier to review. This series rebases the implementation of the TX path on top of the net_iov/netmem framework agreed upon and merged. The motivation for the feature is thoroughly described in the docs & cover letter of the original proposal, so I don't repeat the lengthy descriptions here, but they are available in [1]. Full outline on usage of the TX path is detailed in the documentation included with this series. Test example is available via the kselftest included in the series as well. The series is relatively small, as the TX path for this feature largely piggybacks on the existing MSG_ZEROCOPY implementation. Patch Overview: --------------- 1. Documentation & tests to give high level overview of the feature being added. 1. Add netmem refcounting needed for the TX path. 2. Devmem TX netlink API. 3. Devmem TX net stack implementation. 4. Make dma-buf unbinding scheduled work to handle TX cases where it gets freed from contexts where we can't sleep. 5. Add devmem TX documentation. 6. Add scaffolding enabling driver support for netmem_tx. Add helpers, driver feature flag, and docs to enable drivers to declare netmem_tx support. 7. Guard netmem_tx against being enabled against drivers that don't support it. 8. Add devmem_tx selftests. Add TX path to ncdevmem and add a test to devmem.py. Testing: -------- Testing is very similar to devmem TCP RX path. The ncdevmem test used for the RX path is now augemented with client functionality to test TX path. * Test Setup: Kernel: net-next with this RFC and memory provider API cherry-picked locally. Hardware: Google Cloud A3 VMs. NIC: GVE with header split & RSS & flow steering support. Performance results are not included with this version, unfortunately. I'm having issues running the dma-buf exporter driver against the upstream kernel on my test setup. The issues are specific to that dma-buf exporter and do not affect this patch series. I plan to follow up this series with perf fixes if the tests point to issues once they're up and running. Special thanks to Stan who took a stab at rebasing the TX implementation on top of the netmem/net_iov framework merged. Parts of his proposal [2] that are reused as-is are forked off into their own patches to give full credit. [1] https://lore.kernel.org/netdev/20240909054318.1809580-1-almasrymina@google.… [2] https://lore.kernel.org/netdev/20240913150913.1280238-2-sdf@fomichev.me/T/#… Cc: sdf(a)fomichev.me Cc: asml.silence(a)gmail.com Cc: dw(a)davidwei.uk Cc: Jamal Hadi Salim <jhs(a)mojatatu.com> Cc: Victor Nogueira <victor(a)mojatatu.com> Cc: Pedro Tammela <pctammela(a)mojatatu.com> Cc: Samiullah Khawaja <skhawaja(a)google.com> Cc: Kuniyuki Iwashima <kuniyu(a)amazon.com> Mina Almasry (8): netmem: add niov->type attribute to distinguish different net_iov types net: add get_netmem/put_netmem support net: devmem: Implement TX path net: add devmem TCP TX documentation net: enable driver support for netmem TX gve: add netmem TX support to GVE DQO-RDA mode net: check for driver support in netmem TX selftests: ncdevmem: Implement devmem TCP TX Stanislav Fomichev (1): net: devmem: TCP tx netlink api Documentation/netlink/specs/netdev.yaml | 12 + Documentation/networking/devmem.rst | 150 ++++++++- .../networking/net_cachelines/net_device.rst | 1 + Documentation/networking/netdev-features.rst | 5 + Documentation/networking/netmem.rst | 23 +- drivers/net/ethernet/google/gve/gve_main.c | 3 + drivers/net/ethernet/google/gve/gve_tx_dqo.c | 8 +- include/linux/netdevice.h | 2 + include/linux/skbuff.h | 17 +- include/linux/skbuff_ref.h | 4 +- include/net/netmem.h | 34 +- include/net/sock.h | 1 + include/uapi/linux/netdev.h | 1 + io_uring/zcrx.c | 3 +- net/core/datagram.c | 48 ++- net/core/dev.c | 34 +- net/core/devmem.c | 131 ++++++-- net/core/devmem.h | 83 ++++- net/core/netdev-genl-gen.c | 13 + net/core/netdev-genl-gen.h | 1 + net/core/netdev-genl.c | 80 ++++- net/core/skbuff.c | 48 ++- net/core/sock.c | 5 + net/ipv4/ip_output.c | 3 +- net/ipv4/tcp.c | 48 ++- net/ipv6/ip6_output.c | 3 +- net/vmw_vsock/virtio_transport_common.c | 5 +- tools/include/uapi/linux/netdev.h | 1 + .../selftests/drivers/net/hw/devmem.py | 26 +- .../selftests/drivers/net/hw/ncdevmem.c | 300 +++++++++++++++++- 30 files changed, 1007 insertions(+), 86 deletions(-) base-commit: 3e52667a9c328b3d1a1ddbbb6b8fbf63a217bda3 -- 2.49.0.987.g0cc8ee98dc-goog

6 months

3
11
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[PATCH v2] kunit: fix longest symbol length test

by Sergio González Collado

The kunit test that checks the longests symbol length [1], has triggered warnings in some pilelines when symbol prefixes are used [2]. The test is adjunsted to depend on !PREFIX_SYMBOLS and !CFI_CLANG as sujested in [3] [1] https://lore.kernel.org/rust-for-linux/CABVgOSm=5Q0fM6neBhxSbOUHBgNzmwf2V22… [2] https://lore.kernel.org/all/20250328112156.2614513-1-arnd@kernel.org/T/#u [3] https://lore.kernel.org/linux-kselftest/20250427200916.GA1661412@ax162/T/#t Signed-off-by: Sergio González Collado <sergio.collado(a)gmail.com> --- V1 -> V2: added dependency on !CFI_CLANG as suggested in [3], removed CONFIG_ prefix --- lib/Kconfig.debug | 2 +- lib/tests/longest_symbol_kunit.c | 3 +-- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index f9051ab610d5..5b33673d82da 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2885,7 +2885,7 @@ config FORTIFY_KUNIT_TEST config LONGEST_SYM_KUNIT_TEST tristate "Test the longest symbol possible" if !KUNIT_ALL_TESTS - depends on KUNIT && KPROBES + depends on KUNIT && KPROBES && !PREFIX_SYMBOLS && !CFI_CLANG default KUNIT_ALL_TESTS help Tests the longest symbol possible diff --git a/lib/tests/longest_symbol_kunit.c b/lib/tests/longest_symbol_kunit.c index e3c28ff1807f..b183fb92d1b2 100644 --- a/lib/tests/longest_symbol_kunit.c +++ b/lib/tests/longest_symbol_kunit.c @@ -3,8 +3,7 @@ * Test the longest symbol length. Execute with: * ./tools/testing/kunit/kunit.py run longest-symbol * --arch=x86_64 --kconfig_add CONFIG_KPROBES=y --kconfig_add CONFIG_MODULES=y - * --kconfig_add CONFIG_RETPOLINE=n --kconfig_add CONFIG_CFI_CLANG=n - * --kconfig_add CONFIG_MITIGATION_RETPOLINE=n + * --kconfig_add CONFIG_CPU_MITIGATIONS=n */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt base-commit: ebd297a2affadb6f6f4d2e5d975c1eda18ac762d -- 2.39.2

6 months

3
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[PATCH net-next] selftests: drv-net: ping: make sure the ping test restores checksum offload

by Jakub Kicinski

The ping test flips checksum offload on and off. Make sure the original value is restored if test fails. Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- CC: shuah(a)kernel.org CC: linux-kselftest(a)vger.kernel.org --- tools/testing/selftests/drivers/net/ping.py | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/tools/testing/selftests/drivers/net/ping.py b/tools/testing/selftests/drivers/net/ping.py index af8df2313a3b..e0f114612c1a 100755 --- a/tools/testing/selftests/drivers/net/ping.py +++ b/tools/testing/selftests/drivers/net/ping.py @@ -50,6 +50,16 @@ no_sleep=False cmd(f"echo {test_string} | socat -t 2 -u STDIN TCP:{cfg.remote_baddr}:{port}", shell=True) ksft_eq(nc.stdout.strip(), test_string) +def _schedule_checksum_reset(cfg, netnl) -> None: + features = ethtool(f"-k {cfg.ifname}", json=True) + setting = "" + for side in ["tx", "rx"]: + f = features[0][side + "-checksumming"] + if not f["fixed"]: + setting += " " + side + setting += " " + ("on" if f["requested"] or f["active"] else "off") + defer(ethtool, f" -K {cfg.ifname} " + setting) + def _set_offload_checksum(cfg, netnl, on) -> None: try: ethtool(f" -K {cfg.ifname} rx {on} tx {on} ") @@ -139,6 +149,7 @@ no_sleep=False def test_default_v4(cfg, netnl) -> None: cfg.require_ipver("4") + _schedule_checksum_reset(cfg, netnl) _set_offload_checksum(cfg, netnl, "off") _test_v4(cfg) _test_tcp(cfg) @@ -149,6 +160,7 @@ no_sleep=False def test_default_v6(cfg, netnl) -> None: cfg.require_ipver("6") + _schedule_checksum_reset(cfg, netnl) _set_offload_checksum(cfg, netnl, "off") _test_v6(cfg) _test_tcp(cfg) @@ -157,6 +169,7 @@ no_sleep=False _test_tcp(cfg) def test_xdp_generic_sb(cfg, netnl) -> None: + _schedule_checksum_reset(cfg, netnl) _set_xdp_generic_sb_on(cfg) _set_offload_checksum(cfg, netnl, "off") _test_v4(cfg) @@ -168,6 +181,7 @@ no_sleep=False _test_tcp(cfg) def test_xdp_generic_mb(cfg, netnl) -> None: + _schedule_checksum_reset(cfg, netnl) _set_xdp_generic_mb_on(cfg) _set_offload_checksum(cfg, netnl, "off") _test_v4(cfg) @@ -179,6 +193,7 @@ no_sleep=False _test_tcp(cfg) def test_xdp_native_sb(cfg, netnl) -> None: + _schedule_checksum_reset(cfg, netnl) _set_xdp_native_sb_on(cfg) _set_offload_checksum(cfg, netnl, "off") _test_v4(cfg) @@ -190,6 +205,7 @@ no_sleep=False _test_tcp(cfg) def test_xdp_native_mb(cfg, netnl) -> None: + _schedule_checksum_reset(cfg, netnl) _set_xdp_native_mb_on(cfg) _set_offload_checksum(cfg, netnl, "off") _test_v4(cfg) -- 2.49.0

6 months

3
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[PATCHv2 net-next 0/6] selftests: net: configure rp_filter in setup_ns

by Hangbin Liu

Some distributions enable rp_filter globally by default, which can interfere with various test cases. To address this, many tests explicitly disable rp_filter within their scripts. To avoid duplication and ensure consistent behavior across tests, this patch moves the rp_filter configuration into setup_ns, applied immediately after a new namespace is created. This change ensures that all namespace-based tests inherit the appropriate rp_filter settings, simplifying individual test scripts and improving maintainability. v2: fix srv6_hl2encap_red_l2vpn_test.sh test failure (Jakub Kicinski) Hangbin Liu (6): selftests: net: disable rp_filter after namespace initialization selftests: net: remove redundant rp_filter configuration selftests: net: use setup_ns for bareudp testing selftests: net: use setup_ns for SRv6 tests and remove rp_filter configuration selftests: netfilter: remove rp_filter configuration selftests: mptcp: remove rp_filter configuration tools/testing/selftests/net/bareudp.sh | 49 ++--------- tools/testing/selftests/net/fib_rule_tests.sh | 3 - tools/testing/selftests/net/fib_tests.sh | 3 - tools/testing/selftests/net/icmp_redirect.sh | 2 - tools/testing/selftests/net/lib.sh | 2 + .../testing/selftests/net/mptcp/mptcp_lib.sh | 2 - .../selftests/net/netfilter/br_netfilter.sh | 3 - .../selftests/net/netfilter/bridge_brouter.sh | 2 - .../selftests/net/netfilter/conntrack_vrf.sh | 3 - tools/testing/selftests/net/netfilter/ipvs.sh | 6 -- .../selftests/net/netfilter/nft_fib.sh | 2 - .../selftests/net/netfilter/nft_nat_zones.sh | 2 - .../testing/selftests/net/netfilter/rpath.sh | 18 ++-- .../selftests/net/srv6_end_dt46_l3vpn_test.sh | 5 -- .../selftests/net/srv6_end_dt4_l3vpn_test.sh | 5 -- .../net/srv6_end_next_csid_l3vpn_test.sh | 77 ++++------------- .../net/srv6_end_x_next_csid_l3vpn_test.sh | 83 +++++-------------- .../net/srv6_hencap_red_l3vpn_test.sh | 74 ++++------------- .../net/srv6_hl2encap_red_l2vpn_test.sh | 83 +++++-------------- 19 files changed, 90 insertions(+), 334 deletions(-) -- 2.46.0

6 months

4
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[PATCH 0/6] mm/damon: minor fixups and improvements for code, tests, and documents

by SeongJae Park

Yet another batch of miscellaneous DAMON changes. Fix and improve minor problems in code, tests and documents. SeongJae Park (6): mm/damon/core: warn and fix nr_accesses[_bp] corruption mm/damon/sysfs-schemes: fix wrong comment on damons_sysfs_quota_goal_metric_strs mm/damon/paddr: remove unused variable, folio_list, in damon_pa_stat() mm/damon/tests/core-kunit: add a test for damos_set_filters_default_reject() selftests/damon/_damon_sysfs: read tried regions directories in order Docs/damon: update titles and brief introductions to explain DAMOS Documentation/admin-guide/mm/damon/index.rst | 11 ++- Documentation/mm/damon/index.rst | 6 +- mm/damon/core.c | 14 ++++ mm/damon/paddr.c | 1 - mm/damon/sysfs-schemes.c | 2 +- mm/damon/tests/core-kunit.h | 70 +++++++++++++++++++ tools/testing/selftests/damon/_damon_sysfs.py | 5 ++ 7 files changed, 98 insertions(+), 11 deletions(-) base-commit: fb227aa50d133236ef02a71dd9e3d510f4fad42f -- 2.39.5

6 months

1
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[RESEND PATCH] selftests/bpf: Fix bpf selftest build warning

by Saket Kumar Bhaskar

On linux-next, build for bpf selftest displays a warning: Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'. Commit 8066e388be48 ("net: add UAPI to the header guard in various network headers") changed the header guard from _LINUX_IF_XDP_H to _UAPI_LINUX_IF_XDP_H in include/uapi/linux/if_xdp.h. To resolve the warning, update tools/include/uapi/linux/if_xdp.h to align with the changes in include/uapi/linux/if_xdp.h Fixes: 8066e388be48 ("net: add UAPI to the header guard in various network headers") Reported-by: Venkat Rao Bagalkote <venkat88(a)linux.ibm.com> Closes: https://lore.kernel.org/all/c2bc466d-dff2-4d0d-a797-9af7f676c065@linux.ibm.… Tested-by: Venkat Rao Bagalkote <venkat88(a)linux.ibm.com> Signed-off-by: Saket Kumar Bhaskar <skb99(a)linux.ibm.com> --- [RESEND]: - Added Fixes and Tested-by tag. - Added Greg as receipent for driver-core tree. Original patch: https://lore.kernel.org/all/20250509123802.695574-1-skb99@linux.ibm.com/ tools/include/uapi/linux/if_xdp.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/include/uapi/linux/if_xdp.h b/tools/include/uapi/linux/if_xdp.h index 42869770776e..44f2bb93e7e6 100644 --- a/tools/include/uapi/linux/if_xdp.h +++ b/tools/include/uapi/linux/if_xdp.h @@ -7,8 +7,8 @@ * Magnus Karlsson <magnus.karlsson(a)intel.com> */ -#ifndef _LINUX_IF_XDP_H -#define _LINUX_IF_XDP_H +#ifndef _UAPI_LINUX_IF_XDP_H +#define _UAPI_LINUX_IF_XDP_H #include <linux/types.h> @@ -180,4 +180,4 @@ struct xdp_desc { /* TX packet carries valid metadata. */ #define XDP_TX_METADATA (1 << 1) -#endif /* _LINUX_IF_XDP_H */ +#endif /* _UAPI_LINUX_IF_XDP_H */ -- 2.43.5

6 months

3
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[PATCH v2] KVM: SEV: Disable SEV-SNP support on initialization failure

by Ashish Kalra

From: Ashish Kalra <ashish.kalra(a)amd.com> During platform init, SNP initialization may fail for several reasons, such as firmware command failures and incompatible versions. However, the KVM capability may continue to advertise support for it. The platform may have SNP enabled but if SNP_INIT fails then SNP is not supported by KVM. During KVM module initialization query the SNP platform status to obtain the SNP initialization state and use it as an additional condition to determine support for SEV-SNP. Co-developed-by: Sean Christopherson <seanjc(a)google.com> Signed-off-by: Sean Christopherson <seanjc(a)google.com> Co-developed-by: Pratik R. Sampat <prsampat(a)amd.com> Signed-off-by: Pratik R. Sampat <prsampat(a)amd.com> Signed-off-by: Ashish Kalra <ashish.kalra(a)amd.com> --- arch/x86/kvm/svm/sev.c | 44 +++++++++++++++++++++++++++++++++--------- 1 file changed, 35 insertions(+), 9 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index dea9480b9ff6..f7d343ab9acd 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2935,6 +2935,33 @@ void __init sev_set_cpu_caps(void) } } +static bool is_sev_snp_initialized(void) +{ + struct sev_user_data_snp_status *status; + struct sev_data_snp_addr buf; + bool initialized = false; + int error, ret; + + status = snp_alloc_firmware_page(GFP_KERNEL | __GFP_ZERO); + if (!status) + return false; + + buf.address = __psp_pa(status); + ret = sev_do_cmd(SEV_CMD_SNP_PLATFORM_STATUS, &buf, &error); + if (ret) { + pr_err("SEV: SNP_PLATFORM_STATUS failed ret=%d, fw_error=%d (%#x)\n", + ret, error, error); + goto out; + } + + initialized = !!status->state; + +out: + snp_free_firmware_page(status); + + return initialized; +} + void __init sev_hardware_setup(void) { unsigned int eax, ebx, ecx, edx, sev_asid_count, sev_es_asid_count; @@ -3039,6 +3066,14 @@ void __init sev_hardware_setup(void) sev_snp_supported = sev_snp_enabled && cc_platform_has(CC_ATTR_HOST_SEV_SNP); out: + if (sev_enabled) { + init_args.probe = true; + if (sev_platform_init(&init_args)) + sev_supported = sev_es_supported = sev_snp_supported = false; + else if (sev_snp_supported) + sev_snp_supported = is_sev_snp_initialized(); + } + if (boot_cpu_has(X86_FEATURE_SEV)) pr_info("SEV %s (ASIDs %u - %u)\n", sev_supported ? min_sev_asid <= max_sev_asid ? "enabled" : @@ -3065,15 +3100,6 @@ void __init sev_hardware_setup(void) sev_supported_vmsa_features = 0; if (sev_es_debug_swap_enabled) sev_supported_vmsa_features |= SVM_SEV_FEAT_DEBUG_SWAP; - - if (!sev_enabled) - return; - - /* - * Do both SNP and SEV initialization at KVM module load. - */ - init_args.probe = true; - sev_platform_init(&init_args); } void sev_hardware_unsetup(void) -- 2.34.1

6 months

2
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[PATCH] selftests/mincore: Added comment for minicore test

by Suresh

Signed-off-by: Suresh <suresh.k.chandrappa(a)gmail.com> --- tools/testing/selftests/mincore/mincore_selftest.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/testing/selftests/mincore/mincore_selftest.c b/tools/testing/selftests/mincore/mincore_selftest.c index 17ed3e9917ca..c4f0d21f7678 100644 --- a/tools/testing/selftests/mincore/mincore_selftest.c +++ b/tools/testing/selftests/mincore/mincore_selftest.c @@ -146,6 +146,11 @@ TEST(check_huge_pages) page_size = sysconf(_SC_PAGESIZE); errno = 0; + /* + * Attempt to map a huge page + * MAP_HUGETLB flag requests a huge page allocation + * Size is normal page_size, but kernel uses huge page backing + */ addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB, -1, 0); -- 2.45.2

6 months

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[PATCH bpf-next v5 0/5] Replace CONFIG_DMABUF_SYSFS_STATS with BPF

by T.J. Mercier

Until CONFIG_DMABUF_SYSFS_STATS was added [1] it was only possible to perform per-buffer accounting with debugfs which is not suitable for production environments. Eventually we discovered the overhead with per-buffer sysfs file creation/removal was significantly impacting allocation and free times, and exacerbated kernfs lock contention. [2] dma_buf_stats_setup() is responsible for 39% of single-page buffer creation duration, or 74% of single-page dma_buf_export() duration when stressing dmabuf allocations and frees. I prototyped a change from per-buffer to per-exporter statistics with a RCU protected list of exporter allocations that accommodates most (but not all) of our use-cases and avoids almost all of the sysfs overhead. While that adds less overhead than per-buffer sysfs, and less even than the maintenance of the dmabuf debugfs_list, it's still *additional* overhead on top of the debugfs_list and doesn't give us per-buffer info. This series uses the existing dmabuf debugfs_list to implement a BPF dmabuf iterator, which adds no overhead to buffer allocation/free and provides per-buffer info. The list has been moved outside of CONFIG_DEBUG_FS scope so that it is always populated. The BPF program loaded by userspace that extracts per-buffer information gets to define its own interface which avoids the lack of ABI stability with debugfs. This will allow us to replace our use of CONFIG_DMABUF_SYSFS_STATS, and the plan is to remove it from the kernel after the next longterm stable release. [1] https://lore.kernel.org/linux-media/20201210044400.1080308-1-hridya@google.… [2] https://lore.kernel.org/all/20220516171315.2400578-1-tjmercier@google.com v1: https://lore.kernel.org/all/20250414225227.3642618-1-tjmercier@google.com v1 -> v2: Make the DMA buffer list independent of CONFIG_DEBUG_FS per Christian König Add CONFIG_DMA_SHARED_BUFFER check to kernel/bpf/Makefile per kernel test robot Use BTF_ID_LIST_SINGLE instead of BTF_ID_LIST_GLOBAL_SINGLE per Song Liu Fixup comment style, mixing code/declarations, and use ASSERT_OK_FD in selftest per Song Liu Add BPF_ITER_RESCHED feature to bpf_dmabuf_reg_info per Alexei Starovoitov Add open-coded iterator and selftest per Alexei Starovoitov Add a second test buffer from the system dmabuf heap to selftests Use the BPF program we'll use in production for selftest per Alexei Starovoitov https://r.android.com/c/platform/system/bpfprogs/+/3616123/2/dmabufIter.c https://r.android.com/c/platform/system/memory/libmeminfo/+/3614259/1/libdm… v2: https://lore.kernel.org/all/20250504224149.1033867-1-tjmercier@google.com v2 -> v3: Rebase onto bpf-next/master Move get_next_dmabuf() into drivers/dma-buf/dma-buf.c, along with the new get_first_dmabuf(). This avoids having to expose the dmabuf list and mutex to the rest of the kernel, and keeps the dmabuf mutex operations near each other in the same file. (Christian König) Add Christian's RB to dma-buf: Rename debugfs symbols Drop RFC: dma-buf: Remove DMA-BUF statistics v3: https://lore.kernel.org/all/20250507001036.2278781-1-tjmercier@google.com v3 -> v4: Fix selftest BPF program comment style (not kdoc) per Alexei Starovoitov Fix dma-buf.c kdoc comment style per Alexei Starovoitov Rename get_first_dmabuf / get_next_dmabuf to dma_buf_iter_begin / dma_buf_iter_next per Christian König Add Christian's RB to bpf: Add dmabuf iterator v4: https://lore.kernel.org/all/20250508182025.2961555-1-tjmercier@google.com v4 -> v5: Add Christian's Acks to all patches Add Song Liu's Acks Move BTF_ID_LIST_SINGLE and DEFINE_BPF_ITER_FUNC closer to usage per Song Liu Fix open-coded iterator comment style per Song Liu Move iterator termination check to its own subtest per Song Liu Rework selftest buffer creation per Song Liu Fix spacing in sanitize_string per BPF CI T.J. Mercier (5): dma-buf: Rename debugfs symbols bpf: Add dmabuf iterator bpf: Add open coded dmabuf iterator selftests/bpf: Add test for dmabuf_iter selftests/bpf: Add test for open coded dmabuf_iter drivers/dma-buf/dma-buf.c | 98 +++++-- include/linux/dma-buf.h | 4 +- kernel/bpf/Makefile | 3 + kernel/bpf/dmabuf_iter.c | 150 ++++++++++ kernel/bpf/helpers.c | 5 + .../testing/selftests/bpf/bpf_experimental.h | 5 + tools/testing/selftests/bpf/config | 3 + .../selftests/bpf/prog_tests/dmabuf_iter.c | 276 ++++++++++++++++++ .../testing/selftests/bpf/progs/dmabuf_iter.c | 91 ++++++ 9 files changed, 613 insertions(+), 22 deletions(-) create mode 100644 kernel/bpf/dmabuf_iter.c create mode 100644 tools/testing/selftests/bpf/prog_tests/dmabuf_iter.c create mode 100644 tools/testing/selftests/bpf/progs/dmabuf_iter.c base-commit: 43745d11bfd9683abdf08ad7a5cc403d6a9ffd15 -- 2.49.0.1045.g170613ef41-goog

6 months

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