On 7/17/2025 9:55 PM, mhkelley58@xxxxxxxxx wrote:
> From: Michael Kelley <mhklinux@xxxxxxxxxxx>
>
> Update hypercall call sites to use the new hv_setup_*() functions
> to set up hypercall arguments. Since these functions zero the
> fixed portion of input memory, remove now redundant calls to memset().
>
> Signed-off-by: Michael Kelley <mhklinux@xxxxxxxxxxx>
> Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> ---
>
> Notes:
> Changes in v4:
> * Rename hv_hvcall_*() functions to hv_setup_*() [Easwar Hariharan]
> * Rename hv_hvcall_in_batch_size() to hv_get_input_batch_size()
> [Easwar Hariharan]
>
> Changes in v3:
> * Removed change to definition of struct hv_mmio_write_input so it remains
> consistent with original Hyper-V definitions. Adjusted argument to
> hv_hvcall_in_array() accordingly so that the 64 byte 'data' array is
> not zero'ed. [Nuno Das Neves]
>
> Changes in v2:
> * In hv_arch_irq_unmask(), added check of the number of computed banks
> in the hv_vpset against the batch_size. Since an hv_vpset currently
> represents a maximum of 4096 CPUs, the hv_vpset size does not exceed
> 512 bytes and there should always be sufficent space. But do the
> check just in case something changes. [Nuno Das Neves]
>
> drivers/pci/controller/pci-hyperv.c | 18 ++++++++----------
> 1 file changed, 8 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> index d2b7e8ea710b..79de85d1d68b 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -620,7 +620,7 @@ static void hv_irq_retarget_interrupt(struct irq_data *data)
> struct pci_dev *pdev;
> unsigned long flags;
> u32 var_size = 0;
> - int cpu, nr_bank;
> + int cpu, nr_bank, batch_size;
> u64 res;
>
> dest = irq_data_get_effective_affinity_mask(data);
> @@ -636,8 +636,8 @@ static void hv_irq_retarget_interrupt(struct irq_data *data)
>
> local_irq_save(flags);
>
> - params = *this_cpu_ptr(hyperv_pcpu_input_arg);
> - memset(params, 0, sizeof(*params));
> + batch_size = hv_setup_in_array(¶ms, sizeof(*params),
> + sizeof(params->int_target.vp_set.bank_contents[0]));
> params->partition_id = HV_PARTITION_ID_SELF;
> params->int_entry.source = HV_INTERRUPT_SOURCE_MSI;
> params->int_entry.msi_entry.address.as_uint32 = int_desc->address & 0xffffffff;
> @@ -669,7 +669,7 @@ static void hv_irq_retarget_interrupt(struct irq_data *data)
> nr_bank = cpumask_to_vpset(¶ms->int_target.vp_set, tmp);
> free_cpumask_var(tmp);
>
> - if (nr_bank <= 0) {
> + if (nr_bank <= 0 || nr_bank > batch_size) {
> res = 1;
> goto out;
> }
> @@ -1102,11 +1102,9 @@ static void hv_pci_read_mmio(struct device *dev, phys_addr_t gpa, int size, u32
>
> /*
> * Must be called with interrupts disabled so it is safe
> - * to use the per-cpu input argument page. Use it for
> - * both input and output.
> + * to use the per-cpu argument page.
> */
> - in = *this_cpu_ptr(hyperv_pcpu_input_arg);
> - out = *this_cpu_ptr(hyperv_pcpu_input_arg) + sizeof(*in);
> + hv_setup_inout(&in, sizeof(*in), &out, sizeof(*out));
> in->gpa = gpa;
> in->size = size;
>
> @@ -1135,9 +1133,9 @@ static void hv_pci_write_mmio(struct device *dev, phys_addr_t gpa, int size, u32
>
> /*
> * Must be called with interrupts disabled so it is safe
> - * to use the per-cpu input argument memory.
> + * to use the per-cpu argument page.
> */
> - in = *this_cpu_ptr(hyperv_pcpu_input_arg);
> + hv_setup_in_array(&in, offsetof(typeof(*in), data), sizeof(in->data[0]));
> in->gpa = gpa;
> in->size = size;
> switch (size) {
Reviewed-by: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx>
