On 2/26/2025 12:06 PM, mhkelle...@gmail.com wrote: > From: Michael Kelley <mhkli...@outlook.com> > > Update hypercall call sites to use the new hv_hvcall_*() functions > to set up hypercall arguments. Since these functions zero the > fixed portion of input memory, remove now redundant calls to memset() > and explicit zero'ing of input fields. > > Signed-off-by: Michael Kelley <mhkli...@outlook.com> > --- > arch/x86/hyperv/hv_apic.c | 6 ++---- > arch/x86/hyperv/hv_init.c | 5 +---- > arch/x86/hyperv/hv_vtl.c | 8 ++------ > arch/x86/hyperv/irqdomain.c | 10 ++++------ > 4 files changed, 9 insertions(+), 20 deletions(-) > > diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c > index f022d5f64fb6..c16f81dd36fc 100644 > --- a/arch/x86/hyperv/hv_apic.c > +++ b/arch/x86/hyperv/hv_apic.c > @@ -115,14 +115,12 @@ static bool __send_ipi_mask_ex(const struct cpumask > *mask, int vector, > return false; > > local_irq_save(flags); > - ipi_arg = *this_cpu_ptr(hyperv_pcpu_input_arg); > - > + hv_hvcall_in_array(&ipi_arg, sizeof(*ipi_arg), > + sizeof(ipi_arg->vp_set.bank_contents[0])); I think the returned "batch size" should be checked to ensure it is not too small to hold the variable-sized part of the header.
> if (unlikely(!ipi_arg)) > goto ipi_mask_ex_done; > While here, is this check really needed? If so, maybe a check for the percpu page(s) could be baked into hv_hvcall_inout_array()? > ipi_arg->vector = vector; > - ipi_arg->reserved = 0; > - ipi_arg->vp_set.valid_bank_mask = 0; > > /* > * Use HV_GENERIC_SET_ALL and avoid converting cpumask to VP_SET > diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c > index ddeb40930bc8..c5c9511cb7ed 100644 > --- a/arch/x86/hyperv/hv_init.c > +++ b/arch/x86/hyperv/hv_init.c > @@ -400,13 +400,10 @@ static u8 __init get_vtl(void) > u64 ret; > > local_irq_save(flags); > - input = *this_cpu_ptr(hyperv_pcpu_input_arg); > - output = *this_cpu_ptr(hyperv_pcpu_output_arg); > > - memset(input, 0, struct_size(input, names, 1)); > + hv_hvcall_inout(&input, sizeof(*input), &output, sizeof(*output)); This doesn't look right, this is a rep hypercall taking an array of register names and outputting an array of register values. hv_hvcall_inout_array() should be fully utilized (input and output arrays) here. The current code may actually work, but it will overlap the input and output! > input->partition_id = HV_PARTITION_ID_SELF; > input->vp_index = HV_VP_INDEX_SELF; > - input->input_vtl.as_uint8 = 0; > input->names[0] = HV_REGISTER_VSM_VP_STATUS; > > ret = hv_do_hypercall(control, input, output); > diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c > index 3f4e20d7b724..3dd27d548db6 100644 > --- a/arch/x86/hyperv/hv_vtl.c > +++ b/arch/x86/hyperv/hv_vtl.c <snip> > @@ -185,13 +184,10 @@ static int hv_vtl_apicid_to_vp_id(u32 apic_id) > > local_irq_save(irq_flags); > > - input = *this_cpu_ptr(hyperv_pcpu_input_arg); > - memset(input, 0, sizeof(*input)); > + hv_hvcall_inout(&input, sizeof(*input), &output, sizeof(*output)); This has the same issue as above - it is a rep hypercall so needs hv_hvcall_inout_array() > input->partition_id = HV_PARTITION_ID_SELF; > input->apic_ids[0] = apic_id; > > - output = *this_cpu_ptr(hyperv_pcpu_output_arg); > - > control = HV_HYPERCALL_REP_COMP_1 | HVCALL_GET_VP_ID_FROM_APIC_ID; > status = hv_do_hypercall(control, input, output); > ret = output[0]; > diff --git a/arch/x86/hyperv/irqdomain.c b/arch/x86/hyperv/irqdomain.c > index 64b921360b0f..803b1a945c5c 100644 > --- a/arch/x86/hyperv/irqdomain.c > +++ b/arch/x86/hyperv/irqdomain.c > @@ -24,11 +24,11 @@ static int hv_map_interrupt(union hv_device_id device_id, > bool level, > > local_irq_save(flags); > > - input = *this_cpu_ptr(hyperv_pcpu_input_arg); > - output = *this_cpu_ptr(hyperv_pcpu_output_arg); > + hv_hvcall_inout_array(&input, sizeof(*input), > + > sizeof(input->interrupt_descriptor.target.vp_set.bank_contents[0]), > + &output, sizeof(*output), 0); As noted before I think the batch size should be checked to ensure it is large enough. Side note - it seems in this hypercall, nr_banks + 1 is used as the varhead size, which counts the vp valid mask, but this is not the case in __send_ipi_mask_ex(). Do you happen to know why that might be? Thanks, Nuno > > intr_desc = &input->interrupt_descriptor; > - memset(input, 0, sizeof(*input)); > input->partition_id = hv_current_partition_id; > input->device_id = device_id.as_uint64; > intr_desc->interrupt_type = HV_X64_INTERRUPT_TYPE_FIXED; <snip>
