diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0082-kvm-x86-IA32_ARCH_CAPABILITIES-is-always-supported.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0082-kvm-x86-IA32_ARCH_CAPABILITIES-is-always-supported.patch | 54 |
1 files changed, 0 insertions, 54 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0082-kvm-x86-IA32_ARCH_CAPABILITIES-is-always-supported.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0082-kvm-x86-IA32_ARCH_CAPABILITIES-is-always-supported.patch deleted file mode 100644 index 313f2577..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0082-kvm-x86-IA32_ARCH_CAPABILITIES-is-always-supported.patch +++ /dev/null @@ -1,54 +0,0 @@ -From e34ebcda27df86037fd748254208aff7e442ff0b Mon Sep 17 00:00:00 2001 -From: Jim Mattson <jmattson@google.com> -Date: Wed, 9 May 2018 14:29:35 -0700 -Subject: [PATCH 82/93] kvm: x86: IA32_ARCH_CAPABILITIES is always supported -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -commit 1eaafe91a0df4157521b6417b3dd8430bf5f52f0 upstream. - -If there is a possibility that a VM may migrate to a Skylake host, -then the hypervisor should report IA32_ARCH_CAPABILITIES.RSBA[bit 2] -as being set (future work, of course). This implies that -CPUID.(EAX=7,ECX=0):EDX.ARCH_CAPABILITIES[bit 29] should be -set. Therefore, kvm should report this CPUID bit as being supported -whether or not the host supports it. Userspace is still free to clear -the bit if it chooses. - -For more information on RSBA, see Intel's white paper, "Retpoline: A -Branch Target Injection Mitigation" (Document Number 337131-001), -currently available at https://bugzilla.kernel.org/show_bug.cgi?id=199511. - -Since the IA32_ARCH_CAPABILITIES MSR is emulated in kvm, there is no -dependency on hardware support for this feature. - -Signed-off-by: Jim Mattson <jmattson@google.com> -Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> -Fixes: 28c1c9fabf48 ("KVM/VMX: Emulate MSR_IA32_ARCH_CAPABILITIES") -Cc: stable@vger.kernel.org -Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/x86/kvm/cpuid.c | 5 +++++ - 1 file changed, 5 insertions(+) - -diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c -index 8510b7b..fbd6c62 100644 ---- a/arch/x86/kvm/cpuid.c -+++ b/arch/x86/kvm/cpuid.c -@@ -468,6 +468,11 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, - entry->ecx &= ~F(PKU); - entry->edx &= kvm_cpuid_7_0_edx_x86_features; - cpuid_mask(&entry->edx, CPUID_7_EDX); -+ /* -+ * We emulate ARCH_CAPABILITIES in software even -+ * if the host doesn't support it. -+ */ -+ entry->edx |= F(ARCH_CAPABILITIES); - } else { - entry->ebx = 0; - entry->ecx = 0; --- -2.7.4 - |