Sean Christopherson 5d5103595e x86/cpu: Reinitialize IA32_FEAT_CTL MSR on BSP during wakeup ... Reinitialize IA32_FEAT_CTL on the BSP during wakeup to handle the case where firmware doesn't initialize or save/restore across S3. This fixes a bug where IA32_FEAT_CTL is left uninitialized and results in VMXON taking a #GP due to VMX not being fully enabled, i.e. breaks KVM. Use init_ia32_feat_ctl() to "restore" IA32_FEAT_CTL as it already deals with the case where the MSR is locked, and because APs already redo init_ia32_feat_ctl() during suspend by virtue of the SMP boot flow being used to reinitialize APs upon wakeup. Do the call in the early wakeup flow to avoid dependencies in the syscore_ops chain, e.g. simply adding a resume hook is not guaranteed to work, as KVM does VMXON in its own resume hook, kvm_resume(), when KVM has active guests. Fixes: 21bd3467a5 ("KVM: VMX: Drop initialization of IA32_FEAT_CTL MSR") Reported-by: Brad Campbell <lists2009@fnarfbargle.com> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Tested-by: Brad Campbell <lists2009@fnarfbargle.com> Cc: stable@vger.kernel.org # v5.6 Link: https://lkml.kernel.org/r/20200608174134.11157-1-sean.j.christopherson@intel.com		2020-06-15 14:18:37 +02:00
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cpu.c	x86/cpu: Reinitialize IA32_FEAT_CTL MSR on BSP during wakeup	2020-06-15 14:18:37 +02:00
hibernate_32.c	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
hibernate_64.c	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
hibernate_asm_32.S	x86/asm/32: Change all ENTRY+ENDPROC to SYM_FUNC_*	2019-10-18 12:03:43 +02:00
hibernate_asm_64.S	x86/asm: Change all ENTRY+ENDPROC to SYM_FUNC_*	2019-10-18 11:58:33 +02:00
hibernate.c	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
Makefile	x86, hibernate: Extract the common code of 64/32 bit system	2018-10-03 11:56:33 +02:00