diff options
Diffstat (limited to 'drivers/hv/hv.c')
| -rw-r--r-- | drivers/hv/hv.c | 79 |
1 files changed, 18 insertions, 61 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 8b0dd8e5244d..de6708dbe0df 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -39,42 +39,6 @@ int hv_init(void) } /* - * Functions for allocating and freeing memory with size and - * alignment HV_HYP_PAGE_SIZE. These functions are needed because - * the guest page size may not be the same as the Hyper-V page - * size. We depend upon kmalloc() aligning power-of-two size - * allocations to the allocation size boundary, so that the - * allocated memory appears to Hyper-V as a page of the size - * it expects. - */ - -void *hv_alloc_hyperv_page(void) -{ - BUILD_BUG_ON(PAGE_SIZE < HV_HYP_PAGE_SIZE); - - if (PAGE_SIZE == HV_HYP_PAGE_SIZE) - return (void *)__get_free_page(GFP_KERNEL); - else - return kmalloc(HV_HYP_PAGE_SIZE, GFP_KERNEL); -} - -void *hv_alloc_hyperv_zeroed_page(void) -{ - if (PAGE_SIZE == HV_HYP_PAGE_SIZE) - return (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); - else - return kzalloc(HV_HYP_PAGE_SIZE, GFP_KERNEL); -} - -void hv_free_hyperv_page(unsigned long addr) -{ - if (PAGE_SIZE == HV_HYP_PAGE_SIZE) - free_page(addr); - else - kfree((void *)addr); -} - -/* * hv_post_message - Post a message using the hypervisor message IPC. * * This involves a hypercall. @@ -84,14 +48,15 @@ int hv_post_message(union hv_connection_id connection_id, void *payload, size_t payload_size) { struct hv_input_post_message *aligned_msg; - struct hv_per_cpu_context *hv_cpu; + unsigned long flags; u64 status; if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT) return -EMSGSIZE; - hv_cpu = get_cpu_ptr(hv_context.cpu_context); - aligned_msg = hv_cpu->post_msg_page; + local_irq_save(flags); + + aligned_msg = *this_cpu_ptr(hyperv_pcpu_input_arg); aligned_msg->connectionid = connection_id; aligned_msg->reserved = 0; aligned_msg->message_type = message_type; @@ -106,11 +71,7 @@ int hv_post_message(union hv_connection_id connection_id, status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL); - /* Preemption must remain disabled until after the hypercall - * so some other thread can't get scheduled onto this cpu and - * corrupt the per-cpu post_msg_page - */ - put_cpu_ptr(hv_cpu); + local_irq_restore(flags); return hv_result(status); } @@ -162,12 +123,6 @@ int hv_synic_alloc(void) goto err; } } - - hv_cpu->post_msg_page = (void *)get_zeroed_page(GFP_ATOMIC); - if (hv_cpu->post_msg_page == NULL) { - pr_err("Unable to allocate post msg page\n"); - goto err; - } } return 0; @@ -190,7 +145,6 @@ void hv_synic_free(void) free_page((unsigned long)hv_cpu->synic_event_page); free_page((unsigned long)hv_cpu->synic_message_page); - free_page((unsigned long)hv_cpu->post_msg_page); } kfree(hv_context.hv_numa_map); @@ -217,11 +171,13 @@ void hv_synic_enable_regs(unsigned int cpu) simp.simp_enabled = 1; if (hv_isolation_type_snp() || hv_root_partition) { + /* Mask out vTOM bit. ioremap_cache() maps decrypted */ + u64 base = (simp.base_simp_gpa << HV_HYP_PAGE_SHIFT) & + ~ms_hyperv.shared_gpa_boundary; hv_cpu->synic_message_page - = memremap(simp.base_simp_gpa << HV_HYP_PAGE_SHIFT, - HV_HYP_PAGE_SIZE, MEMREMAP_WB); + = (void *)ioremap_cache(base, HV_HYP_PAGE_SIZE); if (!hv_cpu->synic_message_page) - pr_err("Fail to map syinc message page.\n"); + pr_err("Fail to map synic message page.\n"); } else { simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page) >> HV_HYP_PAGE_SHIFT; @@ -234,12 +190,13 @@ void hv_synic_enable_regs(unsigned int cpu) siefp.siefp_enabled = 1; if (hv_isolation_type_snp() || hv_root_partition) { - hv_cpu->synic_event_page = - memremap(siefp.base_siefp_gpa << HV_HYP_PAGE_SHIFT, - HV_HYP_PAGE_SIZE, MEMREMAP_WB); - + /* Mask out vTOM bit. ioremap_cache() maps decrypted */ + u64 base = (siefp.base_siefp_gpa << HV_HYP_PAGE_SHIFT) & + ~ms_hyperv.shared_gpa_boundary; + hv_cpu->synic_event_page + = (void *)ioremap_cache(base, HV_HYP_PAGE_SIZE); if (!hv_cpu->synic_event_page) - pr_err("Fail to map syinc event page.\n"); + pr_err("Fail to map synic event page.\n"); } else { siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page) >> HV_HYP_PAGE_SHIFT; @@ -316,7 +273,7 @@ void hv_synic_disable_regs(unsigned int cpu) */ simp.simp_enabled = 0; if (hv_isolation_type_snp() || hv_root_partition) { - memunmap(hv_cpu->synic_message_page); + iounmap(hv_cpu->synic_message_page); hv_cpu->synic_message_page = NULL; } else { simp.base_simp_gpa = 0; @@ -328,7 +285,7 @@ void hv_synic_disable_regs(unsigned int cpu) siefp.siefp_enabled = 0; if (hv_isolation_type_snp() || hv_root_partition) { - memunmap(hv_cpu->synic_event_page); + iounmap(hv_cpu->synic_event_page); hv_cpu->synic_event_page = NULL; } else { siefp.base_siefp_gpa = 0; |