x86/hyperv: provide a bunch of helper functions
They are used to deposit pages into Microsoft Hypervisor and bring up logical and virtual processors. Signed-off-by: Lillian Grassin-Drake <ligrassi@microsoft.com> Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com> Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com> Co-Developed-by: Lillian Grassin-Drake <ligrassi@microsoft.com> Co-Developed-by: Sunil Muthuswamy <sunilmut@microsoft.com> Co-Developed-by: Nuno Das Neves <nunodasneves@linux.microsoft.com> Signed-off-by: Wei Liu <wei.liu@kernel.org> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/20210203150435.27941-10-wei.liu@kernel.org
This commit is contained in:
Wei Liu
parent
4f0455cf6f
commit
86b5ec3552
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@ -1,6 +1,6 @@
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# SPDX-License-Identifier: GPL-2.0-only
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obj-y := hv_init.o mmu.o nested.o
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obj-$(CONFIG_X86_64) += hv_apic.o
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obj-$(CONFIG_X86_64) += hv_apic.o hv_proc.o
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ifdef CONFIG_X86_64
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obj-$(CONFIG_PARAVIRT_SPINLOCKS) += hv_spinlock.o
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@ -0,0 +1,219 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/types.h>
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#include <linux/version.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/clockchips.h>
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#include <linux/acpi.h>
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#include <linux/hyperv.h>
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#include <linux/slab.h>
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#include <linux/cpuhotplug.h>
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#include <linux/minmax.h>
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#include <asm/hypervisor.h>
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#include <asm/mshyperv.h>
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#include <asm/apic.h>
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#include <asm/trace/hyperv.h>
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/*
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* See struct hv_deposit_memory. The first u64 is partition ID, the rest
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* are GPAs.
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*/
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#define HV_DEPOSIT_MAX (HV_HYP_PAGE_SIZE / sizeof(u64) - 1)
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/* Deposits exact number of pages. Must be called with interrupts enabled. */
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int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages)
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{
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struct page **pages, *page;
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int *counts;
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int num_allocations;
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int i, j, page_count;
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int order;
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u64 status;
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int ret;
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u64 base_pfn;
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struct hv_deposit_memory *input_page;
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unsigned long flags;
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if (num_pages > HV_DEPOSIT_MAX)
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return -E2BIG;
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if (!num_pages)
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return 0;
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/* One buffer for page pointers and counts */
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page = alloc_page(GFP_KERNEL);
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if (!page)
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return -ENOMEM;
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pages = page_address(page);
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counts = kcalloc(HV_DEPOSIT_MAX, sizeof(int), GFP_KERNEL);
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if (!counts) {
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free_page((unsigned long)pages);
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return -ENOMEM;
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}
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/* Allocate all the pages before disabling interrupts */
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i = 0;
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while (num_pages) {
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/* Find highest order we can actually allocate */
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order = 31 - __builtin_clz(num_pages);
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while (1) {
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pages[i] = alloc_pages_node(node, GFP_KERNEL, order);
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if (pages[i])
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break;
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if (!order) {
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ret = -ENOMEM;
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num_allocations = i;
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goto err_free_allocations;
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}
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--order;
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}
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split_page(pages[i], order);
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counts[i] = 1 << order;
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num_pages -= counts[i];
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i++;
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}
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num_allocations = i;
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local_irq_save(flags);
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input_page = *this_cpu_ptr(hyperv_pcpu_input_arg);
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input_page->partition_id = partition_id;
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/* Populate gpa_page_list - these will fit on the input page */
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for (i = 0, page_count = 0; i < num_allocations; ++i) {
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base_pfn = page_to_pfn(pages[i]);
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for (j = 0; j < counts[i]; ++j, ++page_count)
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input_page->gpa_page_list[page_count] = base_pfn + j;
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}
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status = hv_do_rep_hypercall(HVCALL_DEPOSIT_MEMORY,
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page_count, 0, input_page, NULL);
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local_irq_restore(flags);
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if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS) {
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pr_err("Failed to deposit pages: %lld\n", status);
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ret = status;
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goto err_free_allocations;
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}
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ret = 0;
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goto free_buf;
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err_free_allocations:
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for (i = 0; i < num_allocations; ++i) {
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base_pfn = page_to_pfn(pages[i]);
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for (j = 0; j < counts[i]; ++j)
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__free_page(pfn_to_page(base_pfn + j));
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}
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free_buf:
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free_page((unsigned long)pages);
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kfree(counts);
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return ret;
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}
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int hv_call_add_logical_proc(int node, u32 lp_index, u32 apic_id)
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{
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struct hv_add_logical_processor_in *input;
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struct hv_add_logical_processor_out *output;
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u64 status;
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unsigned long flags;
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int ret = 0;
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int pxm = node_to_pxm(node);
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/*
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* When adding a logical processor, the hypervisor may return
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* HV_STATUS_INSUFFICIENT_MEMORY. When that happens, we deposit more
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* pages and retry.
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*/
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do {
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local_irq_save(flags);
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input = *this_cpu_ptr(hyperv_pcpu_input_arg);
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/* We don't do anything with the output right now */
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output = *this_cpu_ptr(hyperv_pcpu_output_arg);
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input->lp_index = lp_index;
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input->apic_id = apic_id;
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input->flags = 0;
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input->proximity_domain_info.domain_id = pxm;
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input->proximity_domain_info.flags.reserved = 0;
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input->proximity_domain_info.flags.proximity_info_valid = 1;
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input->proximity_domain_info.flags.proximity_preferred = 1;
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status = hv_do_hypercall(HVCALL_ADD_LOGICAL_PROCESSOR,
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input, output);
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local_irq_restore(flags);
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status &= HV_HYPERCALL_RESULT_MASK;
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if (status != HV_STATUS_INSUFFICIENT_MEMORY) {
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if (status != HV_STATUS_SUCCESS) {
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pr_err("%s: cpu %u apic ID %u, %lld\n", __func__,
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lp_index, apic_id, status);
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ret = status;
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}
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break;
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}
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ret = hv_call_deposit_pages(node, hv_current_partition_id, 1);
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} while (!ret);
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return ret;
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}
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int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags)
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{
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struct hv_create_vp *input;
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u64 status;
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unsigned long irq_flags;
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int ret = 0;
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int pxm = node_to_pxm(node);
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/* Root VPs don't seem to need pages deposited */
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if (partition_id != hv_current_partition_id) {
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/* The value 90 is empirically determined. It may change. */
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ret = hv_call_deposit_pages(node, partition_id, 90);
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if (ret)
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return ret;
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}
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do {
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local_irq_save(irq_flags);
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input = *this_cpu_ptr(hyperv_pcpu_input_arg);
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input->partition_id = partition_id;
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input->vp_index = vp_index;
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input->flags = flags;
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input->subnode_type = HvSubnodeAny;
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if (node != NUMA_NO_NODE) {
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input->proximity_domain_info.domain_id = pxm;
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input->proximity_domain_info.flags.reserved = 0;
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input->proximity_domain_info.flags.proximity_info_valid = 1;
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input->proximity_domain_info.flags.proximity_preferred = 1;
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} else {
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input->proximity_domain_info.as_uint64 = 0;
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}
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status = hv_do_hypercall(HVCALL_CREATE_VP, input, NULL);
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local_irq_restore(irq_flags);
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status &= HV_HYPERCALL_RESULT_MASK;
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if (status != HV_STATUS_INSUFFICIENT_MEMORY) {
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if (status != HV_STATUS_SUCCESS) {
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pr_err("%s: vcpu %u, lp %u, %lld\n", __func__,
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vp_index, flags, status);
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ret = status;
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}
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break;
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}
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ret = hv_call_deposit_pages(node, partition_id, 1);
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} while (!ret);
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return ret;
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}
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@ -82,6 +82,10 @@ extern void __percpu **hyperv_pcpu_output_arg;
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extern u64 hv_current_partition_id;
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int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
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int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
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int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
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static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
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{
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u64 input_address = input ? virt_to_phys(input) : 0;
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@ -143,6 +143,8 @@ struct ms_hyperv_tsc_page {
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#define HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX 0x0014
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#define HVCALL_SEND_IPI_EX 0x0015
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#define HVCALL_GET_PARTITION_ID 0x0046
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#define HVCALL_DEPOSIT_MEMORY 0x0048
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#define HVCALL_CREATE_VP 0x004e
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#define HVCALL_GET_VP_REGISTERS 0x0050
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#define HVCALL_SET_VP_REGISTERS 0x0051
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#define HVCALL_POST_MESSAGE 0x005c
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@ -150,6 +152,7 @@ struct ms_hyperv_tsc_page {
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#define HVCALL_POST_DEBUG_DATA 0x0069
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#define HVCALL_RETRIEVE_DEBUG_DATA 0x006a
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#define HVCALL_RESET_DEBUG_SESSION 0x006b
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#define HVCALL_ADD_LOGICAL_PROCESSOR 0x0076
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#define HVCALL_RETARGET_INTERRUPT 0x007e
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#define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af
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#define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0
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@ -414,6 +417,70 @@ struct hv_get_partition_id {
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u64 partition_id;
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} __packed;
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/* HvDepositMemory hypercall */
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struct hv_deposit_memory {
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u64 partition_id;
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u64 gpa_page_list[];
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} __packed;
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struct hv_proximity_domain_flags {
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u32 proximity_preferred : 1;
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u32 reserved : 30;
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u32 proximity_info_valid : 1;
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} __packed;
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/* Not a union in windows but useful for zeroing */
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union hv_proximity_domain_info {
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struct {
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u32 domain_id;
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struct hv_proximity_domain_flags flags;
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};
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u64 as_uint64;
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} __packed;
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struct hv_lp_startup_status {
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u64 hv_status;
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u64 substatus1;
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u64 substatus2;
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u64 substatus3;
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u64 substatus4;
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u64 substatus5;
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u64 substatus6;
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} __packed;
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/* HvAddLogicalProcessor hypercall */
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struct hv_add_logical_processor_in {
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u32 lp_index;
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u32 apic_id;
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union hv_proximity_domain_info proximity_domain_info;
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u64 flags;
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} __packed;
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struct hv_add_logical_processor_out {
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struct hv_lp_startup_status startup_status;
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} __packed;
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enum HV_SUBNODE_TYPE
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{
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HvSubnodeAny = 0,
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HvSubnodeSocket = 1,
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HvSubnodeAmdNode = 2,
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HvSubnodeL3 = 3,
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HvSubnodeCount = 4,
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HvSubnodeInvalid = -1
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};
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/* HvCreateVp hypercall */
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struct hv_create_vp {
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u64 partition_id;
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u32 vp_index;
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u8 padding[3];
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u8 subnode_type;
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u64 subnode_id;
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union hv_proximity_domain_info proximity_domain_info;
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u64 flags;
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} __packed;
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/* HvRetargetDeviceInterrupt hypercall */
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union hv_msi_entry {
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u64 as_uint64;
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