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[70.27.3.10]) by smtp.gmail.com with ESMTPSA id c13-20020ac87dcd000000b0034358bfc3c8sm12007175qte.67.2022.08.16.17.36.19 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 16 Aug 2022 17:36:19 -0700 (PDT) From: Peter Xu To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Sean Christopherson , David Hildenbrand , Andrew Morton , Andrea Arcangeli , peterx@redhat.com, Paolo Bonzini , "Dr . David Alan Gilbert" , Linux MM Mailing List , John Hubbard Subject: [PATCH v3 3/3] kvm/x86: Allow to respond to generic signals during slow page faults Date: Tue, 16 Aug 2022 20:36:14 -0400 Message-Id: <20220817003614.58900-4-peterx@redhat.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220817003614.58900-1-peterx@redhat.com> References: <20220817003614.58900-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Enable x86 slow page faults to be able to respond to non-fatal signals. Signed-off-by: Peter Xu --- arch/x86/kvm/mmu/mmu.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 23dc46da2f18..4a7d387a762a 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4177,7 +4177,12 @@ static int kvm_faultin_pfn(struct kvm_vcpu *vcpu, st= ruct kvm_page_fault *fault) } } =20 - fault->pfn =3D __gfn_to_pfn_memslot(slot, fault->gfn, false, false, NULL, + /* + * Allow gup to bail on pending non-fatal signals when it's also allowed + * to wait for IO. Note, gup always bails if it is unable to quickly + * get a page and a fatal signal, i.e. SIGKILL, is pending. + */ + fault->pfn =3D __gfn_to_pfn_memslot(slot, fault->gfn, false, true, NULL, fault->write, &fault->map_writable, &fault->hva); return RET_PF_CONTINUE; --=20 2.32.0