From: "tip-bot2 for Sean Christopherson" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Jacob Keller <jacob.e.keller@intel.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Borislav Petkov <bp@suse.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
stable@vger.kernel.org, x86 <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: [tip: x86/urgent] x86/pkeys: Manually set X86_FEATURE_OSPKE to preserve existing changes
Date: Thu, 27 Feb 2020 18:07:50 -0000 [thread overview]
Message-ID: <158282687050.28353.6531125831614540420.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20200226231615.13664-1-sean.j.christopherson@intel.com>
The following commit has been merged into the x86/urgent branch of tip:
Commit-ID: 735a6dd02222d8d070c7bb748f25895239ca8c92
Gitweb: https://git.kernel.org/tip/735a6dd02222d8d070c7bb748f25895239ca8c92
Author: Sean Christopherson <sean.j.christopherson@intel.com>
AuthorDate: Wed, 26 Feb 2020 15:16:15 -08:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Thu, 27 Feb 2020 19:02:45 +01:00
x86/pkeys: Manually set X86_FEATURE_OSPKE to preserve existing changes
Explicitly set X86_FEATURE_OSPKE via set_cpu_cap() instead of calling
get_cpu_cap() to pull the feature bit from CPUID after enabling CR4.PKE.
Invoking get_cpu_cap() effectively wipes out any {set,clear}_cpu_cap()
changes that were made between this_cpu->c_init() and setup_pku(), as
all non-synthetic feature words are reinitialized from the CPU's CPUID
values.
Blasting away capability updates manifests most visibility when running
on a VMX capable CPU, but with VMX disabled by BIOS. To indicate that
VMX is disabled, init_ia32_feat_ctl() clears X86_FEATURE_VMX, using
clear_cpu_cap() instead of setup_clear_cpu_cap() so that KVM can report
which CPU is misconfigured (KVM needs to probe every CPU anyways).
Restoring X86_FEATURE_VMX from CPUID causes KVM to think VMX is enabled,
ultimately leading to an unexpected #GP when KVM attempts to do VMXON.
Arguably, init_ia32_feat_ctl() should use setup_clear_cpu_cap() and let
KVM figure out a different way to report the misconfigured CPU, but VMX
is not the only feature bit that is affected, i.e. there is precedent
that tweaking feature bits via {set,clear}_cpu_cap() after ->c_init()
is expected to work. Most notably, x86_init_rdrand()'s clearing of
X86_FEATURE_RDRAND when RDRAND malfunctions is also overwritten.
Fixes: 0697694564c8 ("x86/mm/pkeys: Actually enable Memory Protection Keys in the CPU")
Reported-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Jacob Keller <jacob.e.keller@intel.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200226231615.13664-1-sean.j.christopherson@intel.com
---
arch/x86/kernel/cpu/common.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 52c9bfb..4cdb123 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -445,7 +445,7 @@ static __always_inline void setup_pku(struct cpuinfo_x86 *c)
* cpuid bit to be set. We need to ensure that we
* update that bit in this CPU's "cpu_info".
*/
- get_cpu_cap(c);
+ set_cpu_cap(c, X86_FEATURE_OSPKE);
}
#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
prev parent reply other threads:[~2020-02-27 18:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 23:16 [PATCH] x86/pkeys: Manually set X86_FEATURE_OSPKE to preserve existing changes Sean Christopherson
2020-02-26 23:32 ` Dave Hansen
2020-02-26 23:40 ` Jacob Keller
2020-02-27 0:16 ` Jacob Keller
2020-02-27 18:01 ` Borislav Petkov
2020-02-27 18:20 ` Jacob Keller
2020-02-27 18:07 ` tip-bot2 for Sean Christopherson [this message]
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