From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: "David Rientjes" <rientjes@google.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Sasha Levin" <sashal@kernel.org>,
kvm@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 28/28] kvm: sev: Fail KVM_SEV_INIT if already initialized
Date: Sat, 9 Feb 2019 13:48:36 -0500 [thread overview]
Message-ID: <20190209184840.126418-28-sashal@kernel.org> (raw)
In-Reply-To: <20190209184840.126418-1-sashal@kernel.org>
From: David Rientjes <rientjes@google.com>
[ Upstream commit 3f14a89d1132dcae3c8ce6721c6ef51f6e6d9b5f ]
By code inspection, it was found that multiple calls to KVM_SEV_INIT
could deplete asid bits and overwrite kvm_sev_info's regions_list.
Multiple calls to KVM_SVM_INIT is not likely to occur with QEMU, but this
should likely be fixed anyway.
This code is serialized by kvm->lock.
Fixes: 1654efcbc431 ("KVM: SVM: Add KVM_SEV_INIT command")
Reported-by: Cfir Cohen <cfir@google.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/kvm/svm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index f1d3fe5a0c65..0976853ed723 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6249,6 +6249,9 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
int asid, ret;
ret = -EBUSY;
+ if (unlikely(sev->active))
+ return ret;
+
asid = sev_asid_new();
if (asid < 0)
return ret;
--
2.19.1
prev parent reply other threads:[~2019-02-09 18:53 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-09 18:48 [PATCH AUTOSEL 4.19 01/28] drm/amdgpu/sriov:Correct pfvf exchange logic Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 02/28] ACPI: NUMA: Use correct type for printing addresses on i386-PAE Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 03/28] perf report: Fix wrong iteration count in --branch-history Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 04/28] perf test shell: Use a fallback to get the pathname in vfs_getname Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 05/28] tools uapi: fix RISC-V 64-bit support Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 06/28] riscv: fix trace_sys_exit hook Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 07/28] cpufreq: check if policy is inactive early in __cpufreq_get() Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 08/28] drm/bridge: tc358767: add bus flags Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 09/28] drm/bridge: tc358767: add defines for DP1_SRCCTRL & PHY_2LANE Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 10/28] drm/bridge: tc358767: fix single lane configuration Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 11/28] drm/bridge: tc358767: fix initial DP0/1_SRCCTRL value Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 12/28] drm/bridge: tc358767: reject modes which require too much BW Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 13/28] drm/bridge: tc358767: fix output H/V syncs Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 14/28] nvme-pci: use the same attributes when freeing host_mem_desc_bufs Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 15/28] nvme-pci: fix out of bounds access in nvme_cqe_pending Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 16/28] nvme-multipath: zero out ANA log buffer Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 17/28] nvme: pad fake subsys NQN vid and ssvid with zeros Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 18/28] drm/amdgpu: set WRITE_BURST_LENGTH to 64B to workaround SDMA1 hang Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 19/28] ARM: dts: da850-evm: Correct the audio codec regulators Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 20/28] ARM: dts: da850-evm: Correct the sound card name Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 21/28] ARM: dts: da850-lcdk: Correct the audio codec regulators Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 22/28] ARM: dts: da850-lcdk: Correct the sound card name Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 23/28] ARM: dts: kirkwood: Fix polarity of GPIO fan lines Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 24/28] gpio: pl061: handle failed allocations Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 25/28] drm/nouveau: Don't disable polling in fallback mode Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 26/28] drm/nouveau/falcon: avoid touching registers if engine is off Sasha Levin
2019-02-09 18:48 ` [PATCH AUTOSEL 4.19 27/28] cifs: Limit memory used by lock request calls to a page Sasha Levin
2019-02-09 18:48 ` Sasha Levin [this message]
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