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authorLinus Torvalds <torvalds@linux-foundation.org>2023-09-04 21:26:29 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2023-09-04 21:26:29 +0300
commit0b90c5637dfea8a08f87db5dd16000eb679013a3 (patch)
tree1e64c72282c411c563758a26d34cfe023a56668a /drivers/hv
parente4f1b8202fb59c56a3de7642d50326923670513f (diff)
parent284930a0146ade1ce0250a1d3bae7a675af4bb3b (diff)
downloadlinux-0b90c5637dfea8a08f87db5dd16000eb679013a3.tar.xz
Merge tag 'hyperv-next-signed-20230902' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv updates from Wei Liu: - Support for SEV-SNP guests on Hyper-V (Tianyu Lan) - Support for TDX guests on Hyper-V (Dexuan Cui) - Use SBRM API in Hyper-V balloon driver (Mitchell Levy) - Avoid dereferencing ACPI root object handle in VMBus driver (Maciej Szmigiero) - A few misecllaneous fixes (Jiapeng Chong, Nathan Chancellor, Saurabh Sengar) * tag 'hyperv-next-signed-20230902' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: (24 commits) x86/hyperv: Remove duplicate include x86/hyperv: Move the code in ivm.c around to avoid unnecessary ifdef's x86/hyperv: Remove hv_isolation_type_en_snp x86/hyperv: Use TDX GHCI to access some MSRs in a TDX VM with the paravisor Drivers: hv: vmbus: Bring the post_msg_page back for TDX VMs with the paravisor x86/hyperv: Introduce a global variable hyperv_paravisor_present Drivers: hv: vmbus: Support >64 VPs for a fully enlightened TDX/SNP VM x86/hyperv: Fix serial console interrupts for fully enlightened TDX guests Drivers: hv: vmbus: Support fully enlightened TDX guests x86/hyperv: Support hypercalls for fully enlightened TDX guests x86/hyperv: Add hv_isolation_type_tdx() to detect TDX guests x86/hyperv: Fix undefined reference to isolation_type_en_snp without CONFIG_HYPERV x86/hyperv: Add missing 'inline' to hv_snp_boot_ap() stub hv: hyperv.h: Replace one-element array with flexible-array member Drivers: hv: vmbus: Don't dereference ACPI root object handle x86/hyperv: Add hyperv-specific handling for VMMCALL under SEV-ES x86/hyperv: Add smp support for SEV-SNP guest clocksource: hyper-v: Mark hyperv tsc page unencrypted in sev-snp enlightened guest x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest drivers: hv: Mark percpu hvcall input arg page unencrypted in SEV-SNP enlightened guest ...
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/connection.c16
-rw-r--r--drivers/hv/hv.c131
-rw-r--r--drivers/hv/hv_balloon.c82
-rw-r--r--drivers/hv/hv_common.c48
-rw-r--r--drivers/hv/hyperv_vmbus.h11
-rw-r--r--drivers/hv/vmbus_drv.c3
6 files changed, 225 insertions, 66 deletions
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index ebf15f31d97e..3cabeeabb1ca 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -98,6 +98,7 @@ int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version)
*/
if (version >= VERSION_WIN10_V5) {
msg->msg_sint = VMBUS_MESSAGE_SINT;
+ msg->msg_vtl = ms_hyperv.vtl;
vmbus_connection.msg_conn_id = VMBUS_MESSAGE_CONNECTION_ID_4;
} else {
msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
@@ -482,10 +483,17 @@ void vmbus_set_event(struct vmbus_channel *channel)
++channel->sig_events;
- if (hv_isolation_type_snp())
- hv_ghcb_hypercall(HVCALL_SIGNAL_EVENT, &channel->sig_event,
- NULL, sizeof(channel->sig_event));
- else
+ if (ms_hyperv.paravisor_present) {
+ if (hv_isolation_type_snp())
+ hv_ghcb_hypercall(HVCALL_SIGNAL_EVENT, &channel->sig_event,
+ NULL, sizeof(channel->sig_event));
+ else if (hv_isolation_type_tdx())
+ hv_tdx_hypercall(HVCALL_SIGNAL_EVENT | HV_HYPERCALL_FAST_BIT,
+ channel->sig_event, 0);
+ else
+ WARN_ON_ONCE(1);
+ } else {
hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event);
+ }
}
EXPORT_SYMBOL_GPL(vmbus_set_event);
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 {
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 0d7a3ba66396..e000fa3b9f97 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -8,6 +8,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/cleanup.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/mman.h>
@@ -646,7 +647,7 @@ static int hv_memory_notifier(struct notifier_block *nb, unsigned long val,
void *v)
{
struct memory_notify *mem = (struct memory_notify *)v;
- unsigned long flags, pfn_count;
+ unsigned long pfn_count;
switch (val) {
case MEM_ONLINE:
@@ -655,21 +656,22 @@ static int hv_memory_notifier(struct notifier_block *nb, unsigned long val,
break;
case MEM_OFFLINE:
- spin_lock_irqsave(&dm_device.ha_lock, flags);
- pfn_count = hv_page_offline_check(mem->start_pfn,
- mem->nr_pages);
- if (pfn_count <= dm_device.num_pages_onlined) {
- dm_device.num_pages_onlined -= pfn_count;
- } else {
- /*
- * We're offlining more pages than we managed to online.
- * This is unexpected. In any case don't let
- * num_pages_onlined wrap around zero.
- */
- WARN_ON_ONCE(1);
- dm_device.num_pages_onlined = 0;
+ scoped_guard(spinlock_irqsave, &dm_device.ha_lock) {
+ pfn_count = hv_page_offline_check(mem->start_pfn,
+ mem->nr_pages);
+ if (pfn_count <= dm_device.num_pages_onlined) {
+ dm_device.num_pages_onlined -= pfn_count;
+ } else {
+ /*
+ * We're offlining more pages than we
+ * managed to online. This is
+ * unexpected. In any case don't let
+ * num_pages_onlined wrap around zero.
+ */
+ WARN_ON_ONCE(1);
+ dm_device.num_pages_onlined = 0;
+ }
}
- spin_unlock_irqrestore(&dm_device.ha_lock, flags);
break;
case MEM_GOING_ONLINE:
case MEM_GOING_OFFLINE:
@@ -721,24 +723,23 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
unsigned long start_pfn;
unsigned long processed_pfn;
unsigned long total_pfn = pfn_count;
- unsigned long flags;
for (i = 0; i < (size/HA_CHUNK); i++) {
start_pfn = start + (i * HA_CHUNK);
- spin_lock_irqsave(&dm_device.ha_lock, flags);
- has->ha_end_pfn += HA_CHUNK;
+ scoped_guard(spinlock_irqsave, &dm_device.ha_lock) {
+ has->ha_end_pfn += HA_CHUNK;
- if (total_pfn > HA_CHUNK) {
- processed_pfn = HA_CHUNK;
- total_pfn -= HA_CHUNK;
- } else {
- processed_pfn = total_pfn;
- total_pfn = 0;
- }
+ if (total_pfn > HA_CHUNK) {
+ processed_pfn = HA_CHUNK;
+ total_pfn -= HA_CHUNK;
+ } else {
+ processed_pfn = total_pfn;
+ total_pfn = 0;
+ }
- has->covered_end_pfn += processed_pfn;
- spin_unlock_irqrestore(&dm_device.ha_lock, flags);
+ has->covered_end_pfn += processed_pfn;
+ }
reinit_completion(&dm_device.ol_waitevent);
@@ -758,10 +759,10 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
*/
do_hot_add = false;
}
- spin_lock_irqsave(&dm_device.ha_lock, flags);
- has->ha_end_pfn -= HA_CHUNK;
- has->covered_end_pfn -= processed_pfn;
- spin_unlock_irqrestore(&dm_device.ha_lock, flags);
+ scoped_guard(spinlock_irqsave, &dm_device.ha_lock) {
+ has->ha_end_pfn -= HA_CHUNK;
+ has->covered_end_pfn -= processed_pfn;
+ }
break;
}
@@ -781,10 +782,9 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
static void hv_online_page(struct page *pg, unsigned int order)
{
struct hv_hotadd_state *has;
- unsigned long flags;
unsigned long pfn = page_to_pfn(pg);
- spin_lock_irqsave(&dm_device.ha_lock, flags);
+ guard(spinlock_irqsave)(&dm_device.ha_lock);
list_for_each_entry(has, &dm_device.ha_region_list, list) {
/* The page belongs to a different HAS. */
if ((pfn < has->start_pfn) ||
@@ -794,7 +794,6 @@ static void hv_online_page(struct page *pg, unsigned int order)
hv_bring_pgs_online(has, pfn, 1UL << order);
break;
}
- spin_unlock_irqrestore(&dm_device.ha_lock, flags);
}
static int pfn_covered(unsigned long start_pfn, unsigned long pfn_cnt)
@@ -803,9 +802,8 @@ static int pfn_covered(unsigned long start_pfn, unsigned long pfn_cnt)
struct hv_hotadd_gap *gap;
unsigned long residual, new_inc;
int ret = 0;
- unsigned long flags;
- spin_lock_irqsave(&dm_device.ha_lock, flags);
+ guard(spinlock_irqsave)(&dm_device.ha_lock);
list_for_each_entry(has, &dm_device.ha_region_list, list) {
/*
* If the pfn range we are dealing with is not in the current
@@ -852,7 +850,6 @@ static int pfn_covered(unsigned long start_pfn, unsigned long pfn_cnt)
ret = 1;
break;
}
- spin_unlock_irqrestore(&dm_device.ha_lock, flags);
return ret;
}
@@ -947,7 +944,6 @@ static unsigned long process_hot_add(unsigned long pg_start,
{
struct hv_hotadd_state *ha_region = NULL;
int covered;
- unsigned long flags;
if (pfn_cnt == 0)
return 0;
@@ -979,9 +975,9 @@ static unsigned long process_hot_add(unsigned long pg_start,
ha_region->covered_end_pfn = pg_start;
ha_region->end_pfn = rg_start + rg_size;
- spin_lock_irqsave(&dm_device.ha_lock, flags);
- list_add_tail(&ha_region->list, &dm_device.ha_region_list);
- spin_unlock_irqrestore(&dm_device.ha_lock, flags);
+ scoped_guard(spinlock_irqsave, &dm_device.ha_lock) {
+ list_add_tail(&ha_region->list, &dm_device.ha_region_list);
+ }
}
do_pg_range:
@@ -2047,7 +2043,6 @@ static void balloon_remove(struct hv_device *dev)
struct hv_dynmem_device *dm = hv_get_drvdata(dev);
struct hv_hotadd_state *has, *tmp;
struct hv_hotadd_gap *gap, *tmp_gap;
- unsigned long flags;
if (dm->num_pages_ballooned != 0)
pr_warn("Ballooned pages: %d\n", dm->num_pages_ballooned);
@@ -2073,7 +2068,7 @@ static void balloon_remove(struct hv_device *dev)
#endif
}
- spin_lock_irqsave(&dm_device.ha_lock, flags);
+ guard(spinlock_irqsave)(&dm_device.ha_lock);
list_for_each_entry_safe(has, tmp, &dm->ha_region_list, list) {
list_for_each_entry_safe(gap, tmp_gap, &has->gap_list, list) {
list_del(&gap->list);
@@ -2082,7 +2077,6 @@ static void balloon_remove(struct hv_device *dev)
list_del(&has->list);
kfree(has);
}
- spin_unlock_irqrestore(&dm_device.ha_lock, flags);
}
static int balloon_suspend(struct hv_device *hv_dev)
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 6a2258fef1fe..ccad7bca3fd3 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -24,6 +24,7 @@
#include <linux/kmsg_dump.h>
#include <linux/slab.h>
#include <linux/dma-map-ops.h>
+#include <linux/set_memory.h>
#include <asm/hyperv-tlfs.h>
#include <asm/mshyperv.h>
@@ -359,6 +360,8 @@ int hv_common_cpu_init(unsigned int cpu)
u64 msr_vp_index;
gfp_t flags;
int pgcount = hv_root_partition ? 2 : 1;
+ void *mem;
+ int ret;
/* hv_cpu_init() can be called with IRQs disabled from hv_resume() */
flags = irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL;
@@ -370,14 +373,41 @@ int hv_common_cpu_init(unsigned int cpu)
* allocated if this CPU was previously online and then taken offline
*/
if (!*inputarg) {
- *inputarg = kmalloc(pgcount * HV_HYP_PAGE_SIZE, flags);
- if (!(*inputarg))
+ mem = kmalloc(pgcount * HV_HYP_PAGE_SIZE, flags);
+ if (!mem)
return -ENOMEM;
if (hv_root_partition) {
outputarg = (void **)this_cpu_ptr(hyperv_pcpu_output_arg);
- *outputarg = (char *)(*inputarg) + HV_HYP_PAGE_SIZE;
+ *outputarg = (char *)mem + HV_HYP_PAGE_SIZE;
+ }
+
+ if (!ms_hyperv.paravisor_present &&
+ (hv_isolation_type_snp() || hv_isolation_type_tdx())) {
+ ret = set_memory_decrypted((unsigned long)mem, pgcount);
+ if (ret) {
+ /* It may be unsafe to free 'mem' */
+ return ret;
+ }
+
+ memset(mem, 0x00, pgcount * HV_HYP_PAGE_SIZE);
}
+
+ /*
+ * In a fully enlightened TDX/SNP VM with more than 64 VPs, if
+ * hyperv_pcpu_input_arg is not NULL, set_memory_decrypted() ->
+ * ... -> cpa_flush()-> ... -> __send_ipi_mask_ex() tries to
+ * use hyperv_pcpu_input_arg as the hypercall input page, which
+ * must be a decrypted page in such a VM, but the page is still
+ * encrypted before set_memory_decrypted() returns. Fix this by
+ * setting *inputarg after the above set_memory_decrypted(): if
+ * hyperv_pcpu_input_arg is NULL, __send_ipi_mask_ex() returns
+ * HV_STATUS_INVALID_PARAMETER immediately, and the function
+ * hv_send_ipi_mask() falls back to orig_apic.send_IPI_mask(),
+ * which may be slightly slower than the hypercall, but still
+ * works correctly in such a VM.
+ */
+ *inputarg = mem;
}
msr_vp_index = hv_get_register(HV_REGISTER_VP_INDEX);
@@ -502,6 +532,12 @@ bool __weak hv_isolation_type_snp(void)
}
EXPORT_SYMBOL_GPL(hv_isolation_type_snp);
+bool __weak hv_isolation_type_tdx(void)
+{
+ return false;
+}
+EXPORT_SYMBOL_GPL(hv_isolation_type_tdx);
+
void __weak hv_setup_vmbus_handler(void (*handler)(void))
{
}
@@ -542,3 +578,9 @@ 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);
+
+u64 __weak hv_tdx_hypercall(u64 control, u64 param1, u64 param2)
+{
+ return HV_STATUS_INVALID_PARAMETER;
+}
+EXPORT_SYMBOL_GPL(hv_tdx_hypercall);
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 55f2086841ae..f6b1e710f805 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -124,6 +124,17 @@ struct hv_per_cpu_context {
void *synic_event_page;
/*
+ * The page is only used in hv_post_message() for a TDX VM (with the
+ * paravisor) to post a messages to Hyper-V: when such a VM calls
+ * HVCALL_POST_MESSAGE, it can't use the hyperv_pcpu_input_arg (which
+ * is encrypted in such a VM) as the hypercall input page, because
+ * the input page for HVCALL_POST_MESSAGE must be decrypted in such a
+ * VM, so post_msg_page (which is decrypted in hv_synic_alloc()) is
+ * introduced for this purpose. See hyperv_init() for more comments.
+ */
+ void *post_msg_page;
+
+ /*
* Starting with win8, we can take channel interrupts on any CPU;
* we will manage the tasklet that handles events messages on a per CPU
* basis.
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 67f95a29aeca..edbb38f6956b 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -2287,7 +2287,8 @@ static int vmbus_acpi_add(struct platform_device *pdev)
* Some ancestor of the vmbus acpi device (Gen1 or Gen2
* firmware) is the VMOD that has the mmio ranges. Get that.
*/
- for (ancestor = acpi_dev_parent(device); ancestor;
+ for (ancestor = acpi_dev_parent(device);
+ ancestor && ancestor->handle != ACPI_ROOT_OBJECT;
ancestor = acpi_dev_parent(ancestor)) {
result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS,
vmbus_walk_resources, NULL);