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Date: Mon, 10 Feb 2020 04:34:05 -0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Sean Christopherson <sean.j.christopherson@...el.com>, Paolo Bonzini <pbonzini@...hat.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.19 187/195] KVM: Play nice with read-only memslots when querying host page size From: Sean Christopherson <sean.j.christopherson@...el.com> [ Upstream commit 42cde48b2d39772dba47e680781a32a6c4b7dc33 ] Avoid the "writable" check in __gfn_to_hva_many(), which will always fail on read-only memslots due to gfn_to_hva() assuming writes. Functionally, this allows x86 to create large mappings for read-only memslots that are backed by HugeTLB mappings. Note, the changelog for commit 05da45583de9 ("KVM: MMU: large page support") states "If the largepage contains write-protected pages, a large pte is not used.", but "write-protected" refers to pages that are temporarily read-only, e.g. read-only memslots didn't even exist at the time. Fixes: 4d8b81abc47b ("KVM: introduce readonly memslot") Cc: stable@...r.kernel.org Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com> [Redone using kvm_vcpu_gfn_to_memslot_prot. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@...hat.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- virt/kvm/kvm_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index df7ece0bfcbd3..beec19fcf8cdb 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1301,7 +1301,7 @@ unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn) size = PAGE_SIZE; - addr = kvm_vcpu_gfn_to_hva(vcpu, gfn); + addr = kvm_vcpu_gfn_to_hva_prot(vcpu, gfn, NULL); if (kvm_is_error_hva(addr)) return PAGE_SIZE; -- 2.20.1
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