KVM: xen: do not use struct gfn_to_hva_cache

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gfn_to_hva_cache is not thread-safe, so it is usually used only within
a vCPU (whose code is protected by vcpu->mutex).  The Xen interface
implementation has such a cache in kvm->arch, but it is not really
used except to store the location of the shared info page.  Replace
shinfo_set and shinfo_cache with just the value that is passed via
KVM_XEN_ATTR_TYPE_SHARED_INFO; the only complication is that the
initialization value is not zero anymore and therefore kvm_xen_init_vm
needs to be introduced.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Paolo Bonzini 2021-08-04 12:48:41 -04:00

parent e79f49c37c

commit 319afe6856

4 changed files with 19 additions and 13 deletions

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3

arch/x86/include/asm/kvm_host.h

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arch/x86/kvm/x86.c

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23

arch/x86/kvm/xen.c

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arch/x86/kvm/xen.h

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