From 25727aaed6514b88f98a18862c6f2d65a0b0ec3b Mon Sep 17 00:00:00 2001 From: Michael Kelley Date: Sun, 26 Mar 2023 06:52:05 -0700 Subject: hv_netvsc: Remove second mapping of send and recv buffers With changes to how Hyper-V guest VMs flip memory between private (encrypted) and shared (decrypted), creating a second kernel virtual mapping for shared memory is no longer necessary. Everything needed for the transition to shared is handled by set_memory_decrypted(). As such, remove the code to create and manage the second mapping for the pre-allocated send and recv buffers. This mapping is the last user of hv_map_memory()/hv_unmap_memory(), so delete these functions as well. Finally, hv_map_memory() is the last user of vmap_pfn() in Hyper-V guest code, so remove the Kconfig selection of VMAP_PFN. Signed-off-by: Michael Kelley Reviewed-by: Tianyu Lan Link: https://lore.kernel.org/r/1679838727-87310-11-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu --- arch/x86/hyperv/ivm.c | 28 ------------------------ drivers/hv/Kconfig | 1 - drivers/hv/hv_common.c | 11 ---------- drivers/net/hyperv/hyperv_net.h | 2 -- drivers/net/hyperv/netvsc.c | 48 ++--------------------------------------- include/asm-generic/mshyperv.h | 2 -- 6 files changed, 2 insertions(+), 90 deletions(-) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index f6a020cb1a24..127d5b7b63de 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -376,34 +376,6 @@ void __init hv_vtom_init(void) #endif /* CONFIG_AMD_MEM_ENCRYPT */ -/* - * hv_map_memory - map memory to extra space in the AMD SEV-SNP Isolation VM. - */ -void *hv_map_memory(void *addr, unsigned long size) -{ - unsigned long *pfns = kcalloc(size / PAGE_SIZE, - sizeof(unsigned long), GFP_KERNEL); - void *vaddr; - int i; - - if (!pfns) - return NULL; - - for (i = 0; i < size / PAGE_SIZE; i++) - pfns[i] = vmalloc_to_pfn(addr + i * PAGE_SIZE) + - (ms_hyperv.shared_gpa_boundary >> PAGE_SHIFT); - - vaddr = vmap_pfn(pfns, size / PAGE_SIZE, pgprot_decrypted(PAGE_KERNEL)); - kfree(pfns); - - return vaddr; -} - -void hv_unmap_memory(void *addr) -{ - vunmap(addr); -} - enum hv_isolation_type hv_get_isolation_type(void) { if (!(ms_hyperv.priv_high & HV_ISOLATION)) diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig index 47132b30b7ee..94982f08b661 100644 --- a/drivers/hv/Kconfig +++ b/drivers/hv/Kconfig @@ -8,7 +8,6 @@ config HYPERV || (ACPI && ARM64 && !CPU_BIG_ENDIAN) select PARAVIRT select X86_HV_CALLBACK_VECTOR if X86 - select VMAP_PFN select OF_EARLY_FLATTREE if OF help Select this option to run Linux as a Hyper-V client operating diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index 52a6f89ccdbd..6d40b6c7b23b 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -311,14 +311,3 @@ u64 __weak hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_s return HV_STATUS_INVALID_PARAMETER; } EXPORT_SYMBOL_GPL(hv_ghcb_hypercall); - -void __weak *hv_map_memory(void *addr, unsigned long size) -{ - return NULL; -} -EXPORT_SYMBOL_GPL(hv_map_memory); - -void __weak hv_unmap_memory(void *addr) -{ -} -EXPORT_SYMBOL_GPL(hv_unmap_memory); diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h index dd5919ec408b..33d51e363913 100644 --- a/drivers/net/hyperv/hyperv_net.h +++ b/drivers/net/hyperv/hyperv_net.h @@ -1139,7 +1139,6 @@ struct netvsc_device { /* Receive buffer allocated by us but manages by NetVSP */ void *recv_buf; - void *recv_original_buf; u32 recv_buf_size; /* allocated bytes */ struct vmbus_gpadl recv_buf_gpadl_handle; u32 recv_section_cnt; @@ -1148,7 +1147,6 @@ struct netvsc_device { /* Send buffer allocated by us */ void *send_buf; - void *send_original_buf; u32 send_buf_size; struct vmbus_gpadl send_buf_gpadl_handle; u32 send_section_cnt; diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index da737d959e81..82e9796c8f5e 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -154,17 +154,8 @@ static void free_netvsc_device(struct rcu_head *head) int i; kfree(nvdev->extension); - - if (nvdev->recv_original_buf) - vfree(nvdev->recv_original_buf); - else - vfree(nvdev->recv_buf); - - if (nvdev->send_original_buf) - vfree(nvdev->send_original_buf); - else - vfree(nvdev->send_buf); - + vfree(nvdev->recv_buf); + vfree(nvdev->send_buf); bitmap_free(nvdev->send_section_map); for (i = 0; i < VRSS_CHANNEL_MAX; i++) { @@ -347,7 +338,6 @@ static int netvsc_init_buf(struct hv_device *device, struct nvsp_message *init_packet; unsigned int buf_size; int i, ret = 0; - void *vaddr; /* Get receive buffer area. */ buf_size = device_info->recv_sections * device_info->recv_section_size; @@ -383,17 +373,6 @@ static int netvsc_init_buf(struct hv_device *device, goto cleanup; } - if (hv_isolation_type_snp()) { - vaddr = hv_map_memory(net_device->recv_buf, buf_size); - if (!vaddr) { - ret = -ENOMEM; - goto cleanup; - } - - net_device->recv_original_buf = net_device->recv_buf; - net_device->recv_buf = vaddr; - } - /* Notify the NetVsp of the gpadl handle */ init_packet = &net_device->channel_init_pkt; memset(init_packet, 0, sizeof(struct nvsp_message)); @@ -497,17 +476,6 @@ static int netvsc_init_buf(struct hv_device *device, goto cleanup; } - if (hv_isolation_type_snp()) { - vaddr = hv_map_memory(net_device->send_buf, buf_size); - if (!vaddr) { - ret = -ENOMEM; - goto cleanup; - } - - net_device->send_original_buf = net_device->send_buf; - net_device->send_buf = vaddr; - } - /* Notify the NetVsp of the gpadl handle */ init_packet = &net_device->channel_init_pkt; memset(init_packet, 0, sizeof(struct nvsp_message)); @@ -762,12 +730,6 @@ void netvsc_device_remove(struct hv_device *device) netvsc_teardown_send_gpadl(device, net_device, ndev); } - if (net_device->recv_original_buf) - hv_unmap_memory(net_device->recv_buf); - - if (net_device->send_original_buf) - hv_unmap_memory(net_device->send_buf); - /* Release all resources */ free_netvsc_device_rcu(net_device); } @@ -1844,12 +1806,6 @@ cleanup: netif_napi_del(&net_device->chan_table[0].napi); cleanup2: - if (net_device->recv_original_buf) - hv_unmap_memory(net_device->recv_buf); - - if (net_device->send_original_buf) - hv_unmap_memory(net_device->send_buf); - free_netvsc_device(&net_device->rcu); return ERR_PTR(ret); diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 90d7f68ed39d..afcd9ae9588c 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -271,8 +271,6 @@ u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size); void hyperv_cleanup(void); bool hv_query_ext_cap(u64 cap_query); void hv_setup_dma_ops(struct device *dev, bool coherent); -void *hv_map_memory(void *addr, unsigned long size); -void hv_unmap_memory(void *addr); #else /* CONFIG_HYPERV */ static inline bool hv_is_hyperv_initialized(void) { return false; } static inline bool hv_is_hibernation_supported(void) { return false; } -- cgit v1.2.3