linux-kernel - [PATCH v6 12/12] Send async PF when guest is not in userspace too.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1286207794-16120-13-git-send-email-gleb@redhat.com>
Date:	Mon,  4 Oct 2010 17:56:34 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org, avi@...hat.com,
	mingo@...e.hu, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	hpa@...or.com, riel@...hat.com, cl@...ux-foundation.org,
	mtosatti@...hat.com
Subject: [PATCH v6 12/12] Send async PF when guest is not in userspace too.

If guest indicates that it can handle async pf in kernel mode too send
it, but only if interrupts are enabled.

Signed-off-by: Gleb Natapov <gleb@...hat.com>
---
 arch/x86/kvm/x86.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cad4412..30b1cd1 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6244,7 +6244,8 @@ void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
 		kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
 
 		if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) ||
-		    kvm_x86_ops->get_cpl(vcpu) == 0)
+		    (vcpu->arch.apf.send_user_only &&
+		     kvm_x86_ops->get_cpl(vcpu) == 0))
 			vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
 		else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) {
 			vcpu->arch.fault.error_code = 0;
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/