RE: [PATCH 1/7] hyperv: Detect Nested virtualization support for SVM
From: Michael Kelley <hidden>
Date: 2021-04-07 19:55:28
Also in:
kvm, lkml
From: Vineeth Pillai <redacted> Sent: Wednesday, April 7, 2021 7:41 AM
quoted hunk ↗ jump to hunk
Detect nested features exposed by Hyper-V if SVM is enabled. Signed-off-by: Vineeth Pillai <redacted> --- arch/x86/kernel/cpu/mshyperv.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 3546d3e21787..4d364acfe95d 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c@@ -325,9 +325,17 @@ static void __init ms_hyperv_init_platform(void) ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b); } - if (ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED) { + /* + * AMD does not need enlightened VMCS as VMCB is already a + * datastructure in memory. We need to get the nested + * features if SVM is enabled. + */ + if (boot_cpu_has(X86_FEATURE_SVM) || + ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED) { ms_hyperv.nested_features = cpuid_eax(HYPERV_CPUID_NESTED_FEATURES); + pr_info("Hyper-V nested_features: 0x%x\n",
Nit: Most other similar lines put the colon in a different place:
pr_info("Hyper-V: nested features 0x%x\n",
One of these days, I'm going to fix the ones that don't follow this
pattern. :-)
+ ms_hyperv.nested_features); } /* -- 2.25.1