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    Subject[PATCH 5.4 265/475] xen: fix is_xen_pmu()
    Date
    From: Juergen Gross <jgross@suse.com>

    [ Upstream commit de2ae403b4c0e79a3410e63bc448542fbb9f9bfc ]

    is_xen_pmu() is taking the cpu number as parameter, but it is not using
    it. Instead it just tests whether the Xen PMU initialization on the
    current cpu did succeed. As this test is done by checking a percpu
    pointer, preemption needs to be disabled in order to avoid switching
    the cpu while doing the test. While resuming from suspend() this seems
    not to be the case:

    [ 88.082751] ACPI: PM: Low-level resume complete
    [ 88.087933] ACPI: EC: EC started
    [ 88.091464] ACPI: PM: Restoring platform NVS memory
    [ 88.097166] xen_acpi_processor: Uploading Xen processor PM info
    [ 88.103850] Enabling non-boot CPUs ...
    [ 88.108128] installing Xen timer for CPU 1
    [ 88.112763] BUG: using smp_processor_id() in preemptible [00000000] code: systemd-sleep/7138
    [ 88.122256] caller is is_xen_pmu+0x12/0x30
    [ 88.126937] CPU: 0 PID: 7138 Comm: systemd-sleep Tainted: G W 5.16.13-2.fc32.qubes.x86_64 #1
    [ 88.137939] Hardware name: Star Labs StarBook/StarBook, BIOS 7.97 03/21/2022
    [ 88.145930] Call Trace:
    [ 88.148757] <TASK>
    [ 88.151193] dump_stack_lvl+0x48/0x5e
    [ 88.155381] check_preemption_disabled+0xde/0xe0
    [ 88.160641] is_xen_pmu+0x12/0x30
    [ 88.164441] xen_smp_intr_init_pv+0x75/0x100

    Fix that by replacing is_xen_pmu() by a simple boolean variable which
    reflects the Xen PMU initialization state on cpu 0.

    Modify xen_pmu_init() to return early in case it is being called for a
    cpu other than cpu 0 and the boolean variable not being set.

    Fixes: bf6dfb154d93 ("xen/PMU: PMU emulation code")
    Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
    Signed-off-by: Juergen Gross <jgross@suse.com>
    Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Link: https://lore.kernel.org/r/20220325142002.31789-1-jgross@suse.com
    Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/x86/xen/pmu.c | 10 ++++------
    arch/x86/xen/pmu.h | 3 ++-
    arch/x86/xen/smp_pv.c | 2 +-
    3 files changed, 7 insertions(+), 8 deletions(-)

    diff --git a/arch/x86/xen/pmu.c b/arch/x86/xen/pmu.c
    index e13b0b49fcdf..d7249f4c90f1 100644
    --- a/arch/x86/xen/pmu.c
    +++ b/arch/x86/xen/pmu.c
    @@ -512,10 +512,7 @@ irqreturn_t xen_pmu_irq_handler(int irq, void *dev_id)
    return ret;
    }

    -bool is_xen_pmu(int cpu)
    -{
    - return (get_xenpmu_data() != NULL);
    -}
    +bool is_xen_pmu;

    void xen_pmu_init(int cpu)
    {
    @@ -526,7 +523,7 @@ void xen_pmu_init(int cpu)

    BUILD_BUG_ON(sizeof(struct xen_pmu_data) > PAGE_SIZE);

    - if (xen_hvm_domain())
    + if (xen_hvm_domain() || (cpu != 0 && !is_xen_pmu))
    return;

    xenpmu_data = (struct xen_pmu_data *)get_zeroed_page(GFP_KERNEL);
    @@ -547,7 +544,8 @@ void xen_pmu_init(int cpu)
    per_cpu(xenpmu_shared, cpu).xenpmu_data = xenpmu_data;
    per_cpu(xenpmu_shared, cpu).flags = 0;

    - if (cpu == 0) {
    + if (!is_xen_pmu) {
    + is_xen_pmu = true;
    perf_register_guest_info_callbacks(&xen_guest_cbs);
    xen_pmu_arch_init();
    }
    diff --git a/arch/x86/xen/pmu.h b/arch/x86/xen/pmu.h
    index 0e83a160589b..65c58894fc79 100644
    --- a/arch/x86/xen/pmu.h
    +++ b/arch/x86/xen/pmu.h
    @@ -4,6 +4,8 @@

    #include <xen/interface/xenpmu.h>

    +extern bool is_xen_pmu;
    +
    irqreturn_t xen_pmu_irq_handler(int irq, void *dev_id);
    #ifdef CONFIG_XEN_HAVE_VPMU
    void xen_pmu_init(int cpu);
    @@ -12,7 +14,6 @@ void xen_pmu_finish(int cpu);
    static inline void xen_pmu_init(int cpu) {}
    static inline void xen_pmu_finish(int cpu) {}
    #endif
    -bool is_xen_pmu(int cpu);
    bool pmu_msr_read(unsigned int msr, uint64_t *val, int *err);
    bool pmu_msr_write(unsigned int msr, uint32_t low, uint32_t high, int *err);
    int pmu_apic_update(uint32_t reg);
    diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
    index 0cebe5db691d..64e6ec2c32a7 100644
    --- a/arch/x86/xen/smp_pv.c
    +++ b/arch/x86/xen/smp_pv.c
    @@ -129,7 +129,7 @@ int xen_smp_intr_init_pv(unsigned int cpu)
    per_cpu(xen_irq_work, cpu).irq = rc;
    per_cpu(xen_irq_work, cpu).name = callfunc_name;

    - if (is_xen_pmu(cpu)) {
    + if (is_xen_pmu) {
    pmu_name = kasprintf(GFP_KERNEL, "pmu%d", cpu);
    rc = bind_virq_to_irqhandler(VIRQ_XENPMU, cpu,
    xen_pmu_irq_handler,
    --
    2.34.1


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