diff options
Diffstat (limited to 'drivers/hv/hyperv_vmbus.h')
| -rw-r--r-- | drivers/hv/hyperv_vmbus.h | 76 |
1 files changed, 71 insertions, 5 deletions
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index 0b450e53161e..b2862e0a317a 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -15,6 +15,7 @@ #include <linux/list.h> #include <linux/bitops.h> #include <asm/sync_bitops.h> +#include <asm/mshyperv.h> #include <linux/atomic.h> #include <linux/hyperv.h> #include <linux/interrupt.h> @@ -32,6 +33,7 @@ */ #define HV_UTIL_NEGO_TIMEOUT 55 +void vmbus_isr(void); /* Definitions for the monitored notification facility */ union hv_monitor_trigger_group { @@ -120,8 +122,26 @@ enum { * Per cpu state for channel handling */ struct hv_per_cpu_context { - void *synic_message_page; - void *synic_event_page; + /* + * SynIC pages for communicating with the host. + * + * These pages are accessible to the host partition and the hypervisor. + * They may be used for exchanging data with the host partition and the + * hypervisor even when they aren't trusted yet the guest partition + * must be prepared to handle the malicious behavior. + */ + void *hyp_synic_message_page; + void *hyp_synic_event_page; + /* + * SynIC pages for communicating with the paravisor. + * + * These pages may be accessed from within the guest partition only in + * CoCo VMs. Neither the host partition nor the hypervisor can access + * these pages in that case; they are used for exchanging data with the + * paravisor. + */ + void *para_synic_message_page; + void *para_synic_event_page; /* * The page is only used in hv_post_message() for a TDX VM (with the @@ -171,10 +191,10 @@ extern int hv_synic_alloc(void); extern void hv_synic_free(void); -extern void hv_synic_enable_regs(unsigned int cpu); +extern void hv_hyp_synic_enable_regs(unsigned int cpu); extern int hv_synic_init(unsigned int cpu); -extern void hv_synic_disable_regs(unsigned int cpu); +extern void hv_hyp_synic_disable_regs(unsigned int cpu); extern int hv_synic_cleanup(unsigned int cpu); /* Interface */ @@ -182,7 +202,8 @@ extern int hv_synic_cleanup(unsigned int cpu); void hv_ringbuffer_pre_init(struct vmbus_channel *channel); int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, - struct page *pages, u32 pagecnt, u32 max_pkt_size); + struct page *pages, u32 pagecnt, u32 max_pkt_size, + bool confidential); void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info); @@ -333,6 +354,51 @@ extern const struct vmbus_channel_message_table_entry /* General vmbus interface */ +bool vmbus_is_confidential(void); + +#if IS_ENABLED(CONFIG_HYPERV_VMBUS) +/* Free the message slot and signal end-of-message if required */ +static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type) +{ + /* + * On crash we're reading some other CPU's message page and we need + * to be careful: this other CPU may already had cleared the header + * and the host may already had delivered some other message there. + * In case we blindly write msg->header.message_type we're going + * to lose it. We can still lose a message of the same type but + * we count on the fact that there can only be one + * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages + * on crash. + */ + if (cmpxchg(&msg->header.message_type, old_msg_type, + HVMSG_NONE) != old_msg_type) + return; + + /* + * The cmxchg() above does an implicit memory barrier to + * ensure the write to MessageType (ie set to + * HVMSG_NONE) happens before we read the + * MessagePending and EOMing. Otherwise, the EOMing + * will not deliver any more messages since there is + * no empty slot + */ + if (msg->header.message_flags.msg_pending) { + /* + * This will cause message queue rescan to + * possibly deliver another msg from the + * hypervisor + */ + if (vmbus_is_confidential()) + hv_para_set_synic_register(HV_MSR_EOM, 0); + else + hv_set_msr(HV_MSR_EOM, 0); + } +} + +extern int vmbus_interrupt; +extern int vmbus_irq; +#endif /* CONFIG_HYPERV_VMBUS */ + struct hv_device *vmbus_device_create(const guid_t *type, const guid_t *instance, struct vmbus_channel *channel); |