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author | Jiri Kosina <jkosina@suse.cz> | 2023-11-01 02:07:35 +0300 |
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committer | Jiri Kosina <jkosina@suse.cz> | 2023-11-01 02:07:35 +0300 |
commit | 20cd569d7ee8fce24e8753f0f43af6c420557b1f (patch) | |
tree | f559cfda594846795aa51c99d96f92d8c912851a /drivers/hv/hv.c | |
parent | 62cc9c3cb3ec1bf31cc116146185ed97b450836a (diff) | |
parent | eeebfe6259ba2d5b0980eb7b0df384eb77e9e4f5 (diff) | |
download | linux-20cd569d7ee8fce24e8753f0f43af6c420557b1f.tar.xz |
Merge branch 'for-6.7/config_pm' into for-linus
- #ifdef CONFIG_PM removal from HID code (Thomas Weißschuh)
Diffstat (limited to 'drivers/hv/hv.c')
-rw-r--r-- | drivers/hv/hv.c | 131 |
1 files changed, 117 insertions, 14 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index de6708dbe0df..51e5018ac9b2 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -20,6 +20,7 @@ #include <linux/interrupt.h> #include <clocksource/hyperv_timer.h> #include <asm/mshyperv.h> +#include <linux/set_memory.h> #include "hyperv_vmbus.h" /* The one and only */ @@ -56,20 +57,37 @@ int hv_post_message(union hv_connection_id connection_id, local_irq_save(flags); - aligned_msg = *this_cpu_ptr(hyperv_pcpu_input_arg); + /* + * A TDX VM with the paravisor must use the decrypted post_msg_page: see + * the comment in struct hv_per_cpu_context. A SNP VM with the paravisor + * can use the encrypted hyperv_pcpu_input_arg because it copies the + * input into the GHCB page, which has been decrypted by the paravisor. + */ + if (hv_isolation_type_tdx() && ms_hyperv.paravisor_present) + aligned_msg = this_cpu_ptr(hv_context.cpu_context)->post_msg_page; + else + aligned_msg = *this_cpu_ptr(hyperv_pcpu_input_arg); + aligned_msg->connectionid = connection_id; aligned_msg->reserved = 0; aligned_msg->message_type = message_type; aligned_msg->payload_size = payload_size; memcpy((void *)aligned_msg->payload, payload, payload_size); - if (hv_isolation_type_snp()) - status = hv_ghcb_hypercall(HVCALL_POST_MESSAGE, - (void *)aligned_msg, NULL, - sizeof(*aligned_msg)); - else + if (ms_hyperv.paravisor_present) { + if (hv_isolation_type_tdx()) + status = hv_tdx_hypercall(HVCALL_POST_MESSAGE, + virt_to_phys(aligned_msg), 0); + else if (hv_isolation_type_snp()) + status = hv_ghcb_hypercall(HVCALL_POST_MESSAGE, + aligned_msg, NULL, + sizeof(*aligned_msg)); + else + status = HV_STATUS_INVALID_PARAMETER; + } else { status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL); + } local_irq_restore(flags); @@ -78,7 +96,7 @@ int hv_post_message(union hv_connection_id connection_id, int hv_synic_alloc(void) { - int cpu; + int cpu, ret = -ENOMEM; struct hv_per_cpu_context *hv_cpu; /* @@ -104,11 +122,29 @@ int hv_synic_alloc(void) tasklet_init(&hv_cpu->msg_dpc, vmbus_on_msg_dpc, (unsigned long) hv_cpu); + if (ms_hyperv.paravisor_present && hv_isolation_type_tdx()) { + 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; + } + + ret = set_memory_decrypted((unsigned long)hv_cpu->post_msg_page, 1); + if (ret) { + pr_err("Failed to decrypt post msg page: %d\n", ret); + /* Just leak the page, as it's unsafe to free the page. */ + hv_cpu->post_msg_page = NULL; + goto err; + } + + memset(hv_cpu->post_msg_page, 0, PAGE_SIZE); + } + /* * Synic message and event pages are allocated by paravisor. * Skip these pages allocation here. */ - if (!hv_isolation_type_snp() && !hv_root_partition) { + if (!ms_hyperv.paravisor_present && !hv_root_partition) { hv_cpu->synic_message_page = (void *)get_zeroed_page(GFP_ATOMIC); if (hv_cpu->synic_message_page == NULL) { @@ -120,29 +156,96 @@ int hv_synic_alloc(void) (void *)get_zeroed_page(GFP_ATOMIC); if (hv_cpu->synic_event_page == NULL) { pr_err("Unable to allocate SYNIC event page\n"); + + free_page((unsigned long)hv_cpu->synic_message_page); + hv_cpu->synic_message_page = NULL; goto err; } } + + if (!ms_hyperv.paravisor_present && + (hv_isolation_type_snp() || hv_isolation_type_tdx())) { + ret = set_memory_decrypted((unsigned long) + hv_cpu->synic_message_page, 1); + if (ret) { + pr_err("Failed to decrypt SYNIC msg page: %d\n", ret); + hv_cpu->synic_message_page = NULL; + + /* + * Free the event page here so that hv_synic_free() + * won't later try to re-encrypt it. + */ + free_page((unsigned long)hv_cpu->synic_event_page); + hv_cpu->synic_event_page = NULL; + goto err; + } + + ret = set_memory_decrypted((unsigned long) + hv_cpu->synic_event_page, 1); + if (ret) { + pr_err("Failed to decrypt SYNIC event page: %d\n", ret); + hv_cpu->synic_event_page = NULL; + goto err; + } + + memset(hv_cpu->synic_message_page, 0, PAGE_SIZE); + memset(hv_cpu->synic_event_page, 0, PAGE_SIZE); + } } return 0; + err: /* * Any memory allocations that succeeded will be freed when * the caller cleans up by calling hv_synic_free() */ - return -ENOMEM; + return ret; } void hv_synic_free(void) { - int cpu; + int cpu, ret; for_each_present_cpu(cpu) { struct hv_per_cpu_context *hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu); + /* It's better to leak the page if the encryption fails. */ + if (ms_hyperv.paravisor_present && hv_isolation_type_tdx()) { + if (hv_cpu->post_msg_page) { + ret = set_memory_encrypted((unsigned long) + hv_cpu->post_msg_page, 1); + if (ret) { + pr_err("Failed to encrypt post msg page: %d\n", ret); + hv_cpu->post_msg_page = NULL; + } + } + } + + if (!ms_hyperv.paravisor_present && + (hv_isolation_type_snp() || hv_isolation_type_tdx())) { + if (hv_cpu->synic_message_page) { + ret = set_memory_encrypted((unsigned long) + hv_cpu->synic_message_page, 1); + if (ret) { + pr_err("Failed to encrypt SYNIC msg page: %d\n", ret); + hv_cpu->synic_message_page = NULL; + } + } + + if (hv_cpu->synic_event_page) { + ret = set_memory_encrypted((unsigned long) + hv_cpu->synic_event_page, 1); + if (ret) { + pr_err("Failed to encrypt SYNIC event page: %d\n", ret); + hv_cpu->synic_event_page = NULL; + } + } + } + + free_page((unsigned long)hv_cpu->post_msg_page); free_page((unsigned long)hv_cpu->synic_event_page); free_page((unsigned long)hv_cpu->synic_message_page); } @@ -170,7 +273,7 @@ void hv_synic_enable_regs(unsigned int cpu) simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP); simp.simp_enabled = 1; - if (hv_isolation_type_snp() || hv_root_partition) { + if (ms_hyperv.paravisor_present || 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; @@ -189,7 +292,7 @@ void hv_synic_enable_regs(unsigned int cpu) siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP); siefp.siefp_enabled = 1; - if (hv_isolation_type_snp() || hv_root_partition) { + if (ms_hyperv.paravisor_present || hv_root_partition) { /* Mask out vTOM bit. ioremap_cache() maps decrypted */ u64 base = (siefp.base_siefp_gpa << HV_HYP_PAGE_SHIFT) & ~ms_hyperv.shared_gpa_boundary; @@ -272,7 +375,7 @@ void hv_synic_disable_regs(unsigned int cpu) * addresses. */ simp.simp_enabled = 0; - if (hv_isolation_type_snp() || hv_root_partition) { + if (ms_hyperv.paravisor_present || hv_root_partition) { iounmap(hv_cpu->synic_message_page); hv_cpu->synic_message_page = NULL; } else { @@ -284,7 +387,7 @@ void hv_synic_disable_regs(unsigned int cpu) siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP); siefp.siefp_enabled = 0; - if (hv_isolation_type_snp() || hv_root_partition) { + if (ms_hyperv.paravisor_present || hv_root_partition) { iounmap(hv_cpu->synic_event_page); hv_cpu->synic_event_page = NULL; } else { |