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kvm: Add KVM_PFN_ERR_SIGPENDING

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Add a new pfn error to show that we've got a pending signal to handle
during hva_to_pfn_slow() procedure (of -EINTR retval).

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221011195809.557016-3-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu 2022-10-11 15:58:07 -04:00 committed by Paolo Bonzini
parent 93c5c61d9e
commit fe5ed56c79
2 changed files with 12 additions and 0 deletions
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10
include/linux/kvm_host.h
View File

@ -96,6 +96,7 @@
#define KVM_PFN_ERR_FAULT (KVM_PFN_ERR_MASK)
#define KVM_PFN_ERR_HWPOISON (KVM_PFN_ERR_MASK + 1)
#define KVM_PFN_ERR_RO_FAULT (KVM_PFN_ERR_MASK + 2)
#define KVM_PFN_ERR_SIGPENDING (KVM_PFN_ERR_MASK + 3)
/*
* error pfns indicate that the gfn is in slot but faild to
@ -106,6 +107,15 @@ static inline bool is_error_pfn(kvm_pfn_t pfn)
return !!(pfn & KVM_PFN_ERR_MASK);
}
/*
* KVM_PFN_ERR_SIGPENDING indicates that fetching the PFN was interrupted
* by a pending signal. Note, the signal may or may not be fatal.
*/
static inline bool is_sigpending_pfn(kvm_pfn_t pfn)
{
return pfn == KVM_PFN_ERR_SIGPENDING;
}
/*
* error_noslot pfns indicate that the gfn can not be
* translated to pfn - it is not in slot or failed to

2
virt/kvm/kvm_main.c
View File

@ -2667,6 +2667,8 @@ kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
if (npages == 1)
return pfn;
if (npages == -EINTR)
return KVM_PFN_ERR_SIGPENDING;
mmap_read_lock(current->mm);
if (npages == -EHWPOISON ||