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Message-Id: <1678329614-3482-11-git-send-email-mikelley@microsoft.com>
Date: Wed, 8 Mar 2023 18:40:11 -0800
From: Michael Kelley <mikelley@...rosoft.com>
To: hpa@...or.com, kys@...rosoft.com, haiyangz@...rosoft.com,
wei.liu@...nel.org, decui@...rosoft.com, luto@...nel.org,
peterz@...radead.org, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, lpieralisi@...nel.org,
robh@...nel.org, kw@...ux.com, bhelgaas@...gle.com, arnd@...db.de,
hch@....de, m.szyprowski@...sung.com, robin.murphy@....com,
thomas.lendacky@....com, brijesh.singh@....com, tglx@...utronix.de,
mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
Tianyu.Lan@...rosoft.com, kirill.shutemov@...ux.intel.com,
sathyanarayanan.kuppuswamy@...ux.intel.com, ak@...ux.intel.com,
isaku.yamahata@...el.com, dan.j.williams@...el.com,
jane.chu@...cle.com, seanjc@...gle.com, tony.luck@...el.com,
x86@...nel.org, linux-kernel@...r.kernel.org,
linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
iommu@...ts.linux.dev
Cc: mikelley@...rosoft.com
Subject: [PATCH v6 10/13] 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 <mikelley@...rosoft.com>
Reviewed-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
---
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 f6a020c..127d5b7 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 0747a8f..9a074cb 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -8,7 +8,6 @@ config HYPERV
|| (ARM64 && !CPU_BIG_ENDIAN))
select PARAVIRT
select X86_HV_CALLBACK_VECTOR if X86
- select VMAP_PFN
help
Select this option to run Linux as a Hyper-V client operating
system.
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 52a6f89..6d40b6c 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 dd5919e..33d51e3 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 da737d9..82e9796 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 @@ struct netvsc_device *netvsc_device_add(struct hv_device *device,
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 90d7f68..afcd9ae 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -271,8 +271,6 @@ static inline int cpumask_to_vpset_noself(struct hv_vpset *vpset,
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; }
--
1.8.3.1
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