forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

KVM: Halt vcpu if page it tries to access is swapped out

Browse source 
If a guest accesses swapped out memory do not swap it in from vcpu thread
context. Schedule work to do swapping and put vcpu into halted state
instead.

Interrupts will still be delivered to the guest and if interrupt will
cause reschedule guest will continue to run another task.

[avi: remove call to get_user_pages_noio(), nacked by Linus; this
      makes everything synchrnous again]

Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2010-10-14 11:22:46 +02:00 • committed by Avi Kivity
parent 010c520e20
commit af585b921e
12 changed files with 570 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

90
include/trace/events/kvm.h
View file

@ -185,6 +185,96 @@ TRACE_EVENT(kvm_age_page,
__entry->referenced ? "YOUNG" : "OLD")
);
#ifdef CONFIG_KVM_ASYNC_PF
TRACE_EVENT(
kvm_try_async_get_page,
TP_PROTO(bool async, u64 pfn),
TP_ARGS(async, pfn),
TP_STRUCT__entry(
__field(__u64, pfn)
),
TP_fast_assign(
__entry->pfn = (!async) ? pfn : (u64)-1;
),
TP_printk("pfn %#llx", __entry->pfn)
);
TRACE_EVENT(
kvm_async_pf_not_present,
TP_PROTO(u64 gva),
TP_ARGS(gva),
TP_STRUCT__entry(
__field(__u64, gva)
),
TP_fast_assign(
__entry->gva = gva;
),
TP_printk("gva %#llx not present", __entry->gva)
);
TRACE_EVENT(
kvm_async_pf_ready,
TP_PROTO(u64 gva),
TP_ARGS(gva),
TP_STRUCT__entry(
__field(__u64, gva)
),
TP_fast_assign(
__entry->gva = gva;
),
TP_printk("gva %#llx ready", __entry->gva)
);
TRACE_EVENT(
kvm_async_pf_completed,
TP_PROTO(unsigned long address, struct page *page, u64 gva),
TP_ARGS(address, page, gva),
TP_STRUCT__entry(
__field(unsigned long, address)
__field(pfn_t, pfn)
__field(u64, gva)
),
TP_fast_assign(
__entry->address = address;
__entry->pfn = page ? page_to_pfn(page) : 0;
__entry->gva = gva;
),
TP_printk("gva %#llx address %#lx pfn %#llx", __entry->gva,
__entry->address, __entry->pfn)
);
TRACE_EVENT(
kvm_async_pf_doublefault,
TP_PROTO(u64 gva, u64 gfn),
TP_ARGS(gva, gfn),
TP_STRUCT__entry(
__field(u64, gva)
__field(u64, gfn)
),
TP_fast_assign(
__entry->gva = gva;
__entry->gfn = gfn;
),
TP_printk("gva = %#llx, gfn = %#llx", __entry->gva, __entry->gfn)
);
#endif
#endif /* _TRACE_KVM_MAIN_H */
/* This part must be outside protection */