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X86/Hyper-V: Add flush HvFlushGuestPhysicalAddressSpace hypercall support

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Hyper-V supports a pv hypercall HvFlushGuestPhysicalAddressSpace to
flush nested VM address space mapping in l1 hypervisor and it's to
reduce overhead of flushing ept tlb among vcpus. This patch is to
implement it.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Tianyu Lan
2018-07-19 08:40:06 +00:00
committed by Paolo Bonzini
parent 3553ae5690
commit eb914cfe72
4 changed files with 64 additions and 1 deletions
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2
arch/x86/include/asm/mshyperv.h
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@@ -305,6 +305,7 @@ void hyperv_reenlightenment_intr(struct pt_regs *regs);
void set_hv_tscchange_cb(void (*cb)(void));
void clear_hv_tscchange_cb(void);
void hyperv_stop_tsc_emulation(void);
int hyperv_flush_guest_mapping(u64 as);
#ifdef CONFIG_X86_64
void hv_apic_init(void);
@@ -324,6 +325,7 @@ static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
{
return NULL;
}
static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
#endif /* CONFIG_HYPERV */
#ifdef CONFIG_HYPERV_TSCPAGE