Sean Christopherson 8e61c799c8 KVM: nVMX: Query current VMCS when determining if MSR bitmaps are in use ... commit 7dfbc624eb upstream. Check the current VMCS controls to determine if an MSR write will be intercepted due to MSR bitmaps being disabled. In the nested VMX case, KVM will disable MSR bitmaps in vmcs02 if they're disabled in vmcs12 or if KVM can't map L1's bitmaps for whatever reason. Note, the bad behavior is relatively benign in the current code base as KVM sets all bits in vmcs02's MSR bitmap by default, clears bits if and only if L0 KVM also disables interception of an MSR, and only uses the buggy helper for MSR_IA32_SPEC_CTRL. Because KVM explicitly tests WRMSR before disabling interception of MSR_IA32_SPEC_CTRL, the flawed check will only result in KVM reading MSR_IA32_SPEC_CTRL from hardware when it isn't strictly necessary. Tag the fix for stable in case a future fix wants to use msr_write_intercepted(), in which case a buggy implementation in older kernels could prove subtly problematic. Fixes: d28b387fb7 ("KVM/VMX: Allow direct access to MSR_IA32_SPEC_CTRL") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20211109013047.2041518-2-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-11-17 09:48:24 +01:00
..
boot	x86/boot: Add .text.* to setup.ld	2021-06-16 11:59:38 +02:00
configs
crypto
entry
events	perf/x86: Reset destroy callback on event init failure	2021-10-09 14:39:50 +02:00
hyperv
ia32
include	x86/kvmclock: Move this_cpu_pvti into kvmclock.h	2021-10-06 15:42:31 +02:00
kernel	x86/irq: Ensure PI wakeup handler is unregistered before module unload	2021-11-17 09:48:19 +01:00
kvm	KVM: nVMX: Query current VMCS when determining if MSR bitmaps are in use	2021-11-17 09:48:24 +01:00
lib
math-emu
mm	x86/sme: Use #define USE_EARLY_PGTABLE_L5 in mem_encrypt_identity.c	2021-11-17 09:48:19 +01:00
net	bpf: Introduce BPF nospec instruction for mitigating Spectre v4	2021-09-15 09:47:38 +02:00
oprofile
pci	PCI: Add AMD RS690 quirk to enable 64-bit DMA	2021-06-30 08:47:49 -04:00
platform	x86/platform/olpc: Correct ifdef symbol to intended CONFIG_OLPC_XO15_SCI	2021-10-13 10:08:20 +02:00
power
purgatory
ras
realmode
tools	x86/tools: Fix objdump version check again	2021-08-18 08:57:01 +02:00
um
video
xen	xen/x86: fix PV trap handling on secondary processors	2021-09-30 10:09:21 +02:00
.gitignore
Kbuild
Kconfig	x86/Kconfig: Do not enable AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT automatically	2021-10-20 11:40:15 +02:00
Kconfig.cpu
Kconfig.debug
Makefile
Makefile.um
Makefile_32.cpu