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[PATCH v5 13/17] i386: prefer system KVM_GET_SUPPORTED_HV_CPUID ioctl ov
From: |
Vitaly Kuznetsov |
Subject: |
[PATCH v5 13/17] i386: prefer system KVM_GET_SUPPORTED_HV_CPUID ioctl over vCPU's one |
Date: |
Mon, 1 Mar 2021 14:50:59 +0100 |
KVM_GET_SUPPORTED_HV_CPUID was made a system wide ioctl which can be called
prior to creating vCPUs and we are going to use that to expand Hyper-V cpu
features early. Use it when it is supported by KVM.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
target/i386/kvm/kvm.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 4d301da7375e..264f879cd257 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -928,7 +928,8 @@ static struct {
},
};
-static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs, int max)
+static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs, int max,
+ bool do_sys_ioctl)
{
struct kvm_cpuid2 *cpuid;
int r, size;
@@ -937,7 +938,11 @@ static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs,
int max)
cpuid = g_malloc0(size);
cpuid->nent = max;
- r = kvm_vcpu_ioctl(cs, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
+ if (do_sys_ioctl) {
+ r = kvm_ioctl(kvm_state, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
+ } else {
+ r = kvm_vcpu_ioctl(cs, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
+ }
if (r == 0 && cpuid->nent >= max) {
r = -E2BIG;
}
@@ -964,13 +969,17 @@ static struct kvm_cpuid2 *get_supported_hv_cpuid(CPUState
*cs)
/* 0x40000000..0x40000005, 0x4000000A, 0x40000080..0x40000080 leaves */
int max = 10;
int i;
+ bool do_sys_ioctl;
+
+ do_sys_ioctl =
+ kvm_check_extension(kvm_state, KVM_CAP_SYS_HYPERV_CPUID) > 0;
/*
* When the buffer is too small, KVM_GET_SUPPORTED_HV_CPUID fails with
* -E2BIG, however, it doesn't report back the right size. Keep increasing
* it and re-trying until we succeed.
*/
- while ((cpuid = try_get_hv_cpuid(cs, max)) == NULL) {
+ while ((cpuid = try_get_hv_cpuid(cs, max, do_sys_ioctl)) == NULL) {
max++;
}
@@ -980,7 +989,7 @@ static struct kvm_cpuid2 *get_supported_hv_cpuid(CPUState
*cs)
* information early, just check for the capability and set the bit
* manually.
*/
- if (kvm_check_extension(cs->kvm_state,
+ if (!do_sys_ioctl && kvm_check_extension(cs->kvm_state,
KVM_CAP_HYPERV_ENLIGHTENED_VMCS) > 0) {
for (i = 0; i < cpuid->nent; i++) {
if (cpuid->entries[i].function == HV_CPUID_ENLIGHTMENT_INFO) {
--
2.29.2
- [PATCH v5 03/17] i386: always fill Hyper-V CPUID feature leaves from X86CPU data, (continued)
- [PATCH v5 03/17] i386: always fill Hyper-V CPUID feature leaves from X86CPU data, Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 04/17] i386: stop using env->features[] for filling Hyper-V CPUIDs, Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 05/17] i386: introduce hyperv_feature_supported(), Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 06/17] i386: introduce hv_cpuid_get_host(), Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 07/17] i386: drop FEAT_HYPERV feature leaves, Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 09/17] i386: split hyperv_handle_properties() into hyperv_expand_features()/hyperv_fill_cpuids(), Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 08/17] i386: introduce hv_cpuid_cache, Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 10/17] i386: move eVMCS enablement to hyperv_init_vcpu(), Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 11/17] i386: switch hyperv_expand_features() to using error_setg(), Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 12/17] i386: adjust the expected KVM_GET_SUPPORTED_HV_CPUID array size, Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 13/17] i386: prefer system KVM_GET_SUPPORTED_HV_CPUID ioctl over vCPU's one,
Vitaly Kuznetsov <=
- [PATCH v5 14/17] i386: use global kvm_state in hyperv_enabled() check, Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 15/17] i386: expand Hyper-V features during CPU feature expansion time, Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 16/17] i386: provide simple 'hv-default=on' option, Vitaly Kuznetsov, 2021/03/01
- [PATCH v5 17/17] qtest/hyperv: Introduce a simple hyper-v test, Vitaly Kuznetsov, 2021/03/01