diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0014-KVM-nVMX-Fix-handling-of-lmsw-instruction.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0014-KVM-nVMX-Fix-handling-of-lmsw-instruction.patch | 63 |
1 files changed, 0 insertions, 63 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0014-KVM-nVMX-Fix-handling-of-lmsw-instruction.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0014-KVM-nVMX-Fix-handling-of-lmsw-instruction.patch deleted file mode 100644 index 43b1f38e..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0014-KVM-nVMX-Fix-handling-of-lmsw-instruction.patch +++ /dev/null @@ -1,63 +0,0 @@ -From 2c5329f428b85d1167abdd3206bdac08a02ae082 Mon Sep 17 00:00:00 2001 -From: =?UTF-8?q?Jan=20H=2E=20Sch=C3=B6nherr?= <jschoenh@amazon.de> -Date: Sat, 20 May 2017 13:22:56 +0200 -Subject: [PATCH 14/93] KVM: nVMX: Fix handling of lmsw instruction -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -[ Upstream commit e1d39b17e044e8ae819827810d87d809ba5f58c0 ] - -The decision whether or not to exit from L2 to L1 on an lmsw instruction is -based on bogus values: instead of using the information encoded within the -exit qualification, it uses the data also used for the mov-to-cr -instruction, which boils down to using whatever is in %eax at that point. - -Use the correct values instead. - -Without this fix, an L1 may not get notified when a 32-bit Linux L2 -switches its secondary CPUs to protected mode; the L1 is only notified on -the next modification of CR0. This short time window poses a problem, when -there is some other reason to exit to L1 in between. Then, L2 will be -resumed in real mode and chaos ensues. - -Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de> -Reviewed-by: Wanpeng Li <wanpeng.li@hotmail.com> -Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> -Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/x86/kvm/vmx.c | 7 +++++-- - 1 file changed, 5 insertions(+), 2 deletions(-) - -diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c -index 27f505d..8d842d9 100644 ---- a/arch/x86/kvm/vmx.c -+++ b/arch/x86/kvm/vmx.c -@@ -7910,11 +7910,13 @@ static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu, - { - unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); - int cr = exit_qualification & 15; -- int reg = (exit_qualification >> 8) & 15; -- unsigned long val = kvm_register_readl(vcpu, reg); -+ int reg; -+ unsigned long val; - - switch ((exit_qualification >> 4) & 3) { - case 0: /* mov to cr */ -+ reg = (exit_qualification >> 8) & 15; -+ val = kvm_register_readl(vcpu, reg); - switch (cr) { - case 0: - if (vmcs12->cr0_guest_host_mask & -@@ -7969,6 +7971,7 @@ static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu, - * lmsw can change bits 1..3 of cr0, and only set bit 0 of - * cr0. Other attempted changes are ignored, with no exit. - */ -+ val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f; - if (vmcs12->cr0_guest_host_mask & 0xe & - (val ^ vmcs12->cr0_read_shadow)) - return true; --- -2.7.4 - |