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Linux v3.14.34

This commit is contained in:
Josh Boyer 2015-03-17 08:27:46 -04:00
parent 47394f031b
commit f40121eec0
2 changed files with 4 additions and 92 deletions
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11
kernel.spec
View File

@ -74,7 +74,7 @@ Summary: The Linux kernel
%if 0%{?released_kernel}
# Do we have a -stable update to apply?
%define stable_update 32
%define stable_update 34
# Is it a -stable RC?
%define stable_rc 0
# Set rpm version accordingly
@ -753,9 +753,6 @@ Patch25109: revert-input-wacom-testing-result-shows-get_report-is-unnecessary.pa
Patch25110: 0001-ideapad-laptop-Blacklist-rfkill-control-on-the-Lenov.patch
Patch25111: 0002-ideapad-laptop-Change-Lenovo-Yoga-2-series-rfkill-ha.patch
# CVE-2014-3690 rhbz 1153322 1155372
Patch26060: x86-kvm-vmx-Preserve-CR4-across-VM-entry.patch
# END OF PATCH DEFINITIONS
%endif
@ -1451,9 +1448,6 @@ ApplyPatch revert-input-wacom-testing-result-shows-get_report-is-unnecessary.pat
ApplyPatch 0001-ideapad-laptop-Blacklist-rfkill-control-on-the-Lenov.patch
ApplyPatch 0002-ideapad-laptop-Change-Lenovo-Yoga-2-series-rfkill-ha.patch
# CVE-2014-3690 rhbz 1153322 1155372
ApplyPatch x86-kvm-vmx-Preserve-CR4-across-VM-entry.patch
# END OF PATCH APPLICATIONS
%endif
@ -2266,6 +2260,9 @@ fi
# and build.
%changelog
* Fri Feb 27 2015 Josh Boyer <jwboyer@fedoraproject.org> - 3.14.34-100
- Linux v3.14.34
* Fri Feb 06 2015 Josh Boyer <jwboyer@fedoraproject.org> - 3.14.32-100
- Linux v3.14.32

85
x86-kvm-vmx-Preserve-CR4-across-VM-entry.patch
View File

@ -1,85 +0,0 @@
From 2401bcf9fb70d5577699835058e740ad18da6e24 Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@amacapital.net>
Date: Wed, 8 Oct 2014 09:02:13 -0700
Subject: [PATCH] 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>
Conflicts:
arch/x86/kvm/vmx.c
---
arch/x86/kvm/vmx.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 392752834751..21ccec8eb01b 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -441,6 +441,7 @@ struct vcpu_vmx {
#endif
int gs_ldt_reload_needed;
int fs_reload_needed;
+ unsigned long vmcs_host_cr4; /* May not match real cr4 */
} host_state;
struct {
int vm86_active;
@@ -4162,11 +4163,16 @@ static void vmx_set_constant_host_state(struct vcpu_vmx *vmx)
u32 low32, high32;
unsigned long tmpl;
struct desc_ptr dt;
+ unsigned long cr4;
vmcs_writel(HOST_CR0, read_cr0() & ~X86_CR0_TS); /* 22.2.3 */
- vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */
vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
+ /* Save the most likely value for this task's CR4 in the VMCS. */
+ cr4 = read_cr4();
+ vmcs_writel(HOST_CR4, cr4); /* 22.2.3, 22.2.5 */
+ vmx->host_state.vmcs_host_cr4 = cr4;
+
vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */
#ifdef CONFIG_X86_64
/*
@@ -7186,7 +7192,7 @@ static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx)
static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
- unsigned long debugctlmsr;
+ unsigned long debugctlmsr, cr4;
/* Record the guest's net vcpu time for enforced NMI injections. */
if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
@@ -7207,6 +7213,12 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
+ cr4 = read_cr4();
+ if (unlikely(cr4 != vmx->host_state.vmcs_host_cr4)) {
+ vmcs_writel(HOST_CR4, cr4);
+ vmx->host_state.vmcs_host_cr4 = cr4;
+ }
+
/* When single-stepping over STI and MOV SS, we must clear the
* corresponding interruptibility bits in the guest state. Otherwise
* vmentry fails as it then expects bit 14 (BS) in pending debug
--
1.9.3