linux/arch/x86/kvm
Andy Lutomirski d974baa398 x86,kvm,vmx: Preserve CR4 across VM entry
CR4 isn't constant; at least the TSD and PCE bits can vary.

TBH, treating CR0 and CR3 as constant scares me a bit, too, but it looks
like it's correct.

This adds a branch and a read from cr4 to each vm entry.  Because it is
extremely likely that consecutive entries into the same vcpu will have
the same host cr4 value, this fixes up the vmcs instead of restoring cr4
after the fact.  A subsequent patch will add a kernel-wide cr4 shadow,
reducing the overhead in the common case to just two memory reads and a
branch.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: stable@vger.kernel.org
Cc: Petr Matousek <pmatouse@redhat.com>
Cc: Gleb Natapov <gleb@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-10-18 10:09:03 -07:00
..
cpuid.c KVM: nested VMX: disable perf cpuid reporting 2014-09-24 14:07:50 +02:00
cpuid.h KVM: x86: Warn if guest virtual address space is not 48-bits 2014-09-24 14:07:48 +02:00
emulate.c KVM: x86: emulating descriptor load misses long-mode case 2014-09-24 14:07:52 +02:00
i8254.c KVM: x86: limit PIT timer frequency 2014-01-15 12:43:54 +01:00
i8254.h KVM: fold kvm_pit_timer into kvm_kpit_state 2012-08-01 00:21:07 -03:00
i8259.c KVM: inject ExtINT interrupt before APIC interrupts 2012-12-13 23:05:21 -02:00
irq.c KVM: nVMX: fix "acknowledge interrupt on exit" when APICv is in use 2014-08-05 15:00:24 +02:00
irq.h KVM: switch to symbolic name for irq_states size 2012-07-20 16:12:16 -03:00
Kconfig KVM: Give IRQFD its own separate enabling Kconfig option 2014-08-05 14:26:28 +02:00
kvm_cache_regs.h KVM: MMU: Do not unconditionally read PDPTE from guest memory 2011-09-25 19:18:01 +03:00
lapic.c KVM: x86: make apic_accept_irq tracepoint more generic 2014-09-11 11:51:02 +02:00
lapic.h KVM: x86: Validate guest writes to MSR_IA32_APICBASE 2014-01-27 14:39:44 +01:00
Makefile kvm: Add VFIO device 2013-10-30 19:02:03 +01:00
mmu_audit.c arch/x86: replace strict_strto calls 2014-08-08 15:57:28 -07:00
mmu.c Merge branch 'for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2014-10-10 07:26:02 -04:00
mmu.h KVM: mmio: cleanup kvm_set_mmio_spte_mask 2014-09-03 10:04:10 +02:00
mmutrace.h x86/kvm: Resolve shadow warnings in macro expansion 2014-07-31 16:33:29 +02:00
paging_tmpl.h KVM: x86: Remove debug assertion of non-PAE reserved bits 2014-09-24 14:07:55 +02:00
pmu.c KVM: x86: Clarify PMU related features bit manipulation 2014-08-20 13:01:25 +02:00
svm.c Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2014-10-15 07:48:18 +02:00
trace.h KVM: x86: make apic_accept_irq tracepoint more generic 2014-09-11 11:51:02 +02:00
tss.h
vmx.c x86,kvm,vmx: Preserve CR4 across VM entry 2014-10-18 10:09:03 -07:00
x86.c Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2014-10-15 07:48:18 +02:00
x86.h KVM: vmx: Inject #GP on invalid PAT CR 2014-09-24 14:07:52 +02:00