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From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: qemu-devel@nongnu.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	Eduardo Habkost <ehabkost@redhat.com>,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>
Subject: [PATCH RFC v3 15/23] i386: introduce hv_cpuid_cache
Date: Fri,  9 Oct 2020 14:18:34 +0200	[thread overview]
Message-ID: <20201009121842.1938010-16-vkuznets@redhat.com> (raw)
In-Reply-To: <20201009121842.1938010-1-vkuznets@redhat.com>

Just like with cpuid_cache, it makes no sense to call
KVM_GET_SUPPORTED_HV_CPUID more than once and instead of (ab)using
env->features[] and/or trying to keep all the code in one place, it is
better to introduce persistent hv_cpuid_cache and hv_cpuid_get_host()
accessor to it.

Note, hv_cpuid_get_fw() is converted to using hv_cpuid_get_host()
just to be removed later with Hyper-V specific feature words.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 target/i386/kvm.c | 109 ++++++++++++++++++++++++----------------------
 1 file changed, 56 insertions(+), 53 deletions(-)

diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index a4f3ad2f7564..cfb5ced003f6 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -125,6 +125,7 @@ static int has_exception_payload;
 static bool has_msr_mcg_ext_ctl;
 
 static struct kvm_cpuid2 *cpuid_cache;
+static struct kvm_cpuid2 *hv_cpuid_cache;
 static struct kvm_msr_list *kvm_feature_msrs;
 
 int kvm_has_pit_state2(void)
@@ -1065,10 +1066,25 @@ static struct kvm_cpuid2 *get_supported_hv_cpuid_legacy(CPUState *cs)
     return cpuid;
 }
 
-static uint32_t hv_cpuid_get_host(struct kvm_cpuid2 *cpuid, uint32_t func,
-                                  int reg)
+static uint32_t hv_cpuid_get_host(CPUState *cs, uint32_t func, int reg)
 {
     struct kvm_cpuid_entry2 *entry;
+    struct kvm_cpuid2 *cpuid;
+
+    if (hv_cpuid_cache) {
+        cpuid = hv_cpuid_cache;
+    } else {
+        if (kvm_check_extension(kvm_state, KVM_CAP_HYPERV_CPUID) > 0) {
+            cpuid = get_supported_hv_cpuid(cs);
+        } else {
+            cpuid = get_supported_hv_cpuid_legacy(cs);
+        }
+        hv_cpuid_cache = cpuid;
+    }
+
+    if (!cpuid) {
+        return 0;
+    }
 
     entry = cpuid_find_entry(cpuid, func, 0);
     if (!entry) {
@@ -1078,7 +1094,7 @@ static uint32_t hv_cpuid_get_host(struct kvm_cpuid2 *cpuid, uint32_t func,
     return cpuid_entry_get_reg(entry, reg);
 }
 
-static bool hyperv_feature_supported(struct kvm_cpuid2 *cpuid, int feature)
+static bool hyperv_feature_supported(CPUState *cs, int feature)
 {
     uint32_t func, bits;
     int i, reg;
@@ -1093,7 +1109,7 @@ static bool hyperv_feature_supported(struct kvm_cpuid2 *cpuid, int feature)
             continue;
         }
 
-        if ((hv_cpuid_get_host(cpuid, func, reg) & bits) != bits) {
+        if ((hv_cpuid_get_host(cs, func, reg) & bits) != bits) {
             return false;
         }
     }
@@ -1101,8 +1117,7 @@ static bool hyperv_feature_supported(struct kvm_cpuid2 *cpuid, int feature)
     return true;
 }
 
-static int hv_cpuid_check_and_set(CPUState *cs, struct kvm_cpuid2 *cpuid,
-                                  int feature)
+static int hv_cpuid_check_and_set(CPUState *cs, int feature)
 {
     X86CPU *cpu = X86_CPU(cs);
     uint64_t deps;
@@ -1125,7 +1140,7 @@ static int hv_cpuid_check_and_set(CPUState *cs, struct kvm_cpuid2 *cpuid,
         deps &= ~(1ull << dep_feat);
     }
 
-    if (!hyperv_feature_supported(cpuid, feature)) {
+    if (!hyperv_feature_supported(cs, feature)) {
         if (hyperv_feat_enabled(cpu, feature)) {
             fprintf(stderr,
                     "Hyper-V %s is not supported by kernel\n",
@@ -1178,7 +1193,6 @@ static int hyperv_handle_properties(CPUState *cs,
                                     struct kvm_cpuid_entry2 *cpuid_ent)
 {
     X86CPU *cpu = X86_CPU(cs);
-    struct kvm_cpuid2 *cpuid;
     struct kvm_cpuid_entry2 *c;
     uint32_t cpuid_i = 0;
     int r;
@@ -1204,71 +1218,65 @@ static int hyperv_handle_properties(CPUState *cs,
         }
     }
 
-    if (kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV_CPUID) > 0) {
-        cpuid = get_supported_hv_cpuid(cs);
-    } else {
-        cpuid = get_supported_hv_cpuid_legacy(cs);
-    }
-
     if (cpu->hyperv_passthrough) {
         cpu->hyperv_vendor_id[0] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, R_EBX);
+            hv_cpuid_get_host(cs, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, R_EBX);
         cpu->hyperv_vendor_id[1] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, R_ECX);
+            hv_cpuid_get_host(cs, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, R_ECX);
         cpu->hyperv_vendor_id[2] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, R_EDX);
+            hv_cpuid_get_host(cs, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, R_EDX);
         cpu->hyperv_vendor = g_realloc(cpu->hyperv_vendor,
                                        sizeof(cpu->hyperv_vendor_id) + 1);
         memcpy(cpu->hyperv_vendor, cpu->hyperv_vendor_id,
                sizeof(cpu->hyperv_vendor_id));
 
         cpu->hyperv_interface_id[0] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_INTERFACE, R_EAX);
+            hv_cpuid_get_host(cs, HV_CPUID_INTERFACE, R_EAX);
         cpu->hyperv_interface_id[1] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_INTERFACE, R_EBX);
+            hv_cpuid_get_host(cs, HV_CPUID_INTERFACE, R_EBX);
         cpu->hyperv_interface_id[2] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_INTERFACE, R_ECX);
+            hv_cpuid_get_host(cs, HV_CPUID_INTERFACE, R_ECX);
         cpu->hyperv_interface_id[3] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_INTERFACE, R_EDX);
+            hv_cpuid_get_host(cs, HV_CPUID_INTERFACE, R_EDX);
 
         cpu->hyperv_version_id[0] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_VERSION, R_EAX);
+            hv_cpuid_get_host(cs, HV_CPUID_VERSION, R_EAX);
         cpu->hyperv_version_id[1] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_VERSION, R_EBX);
+            hv_cpuid_get_host(cs, HV_CPUID_VERSION, R_EBX);
         cpu->hyperv_version_id[2] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_VERSION, R_ECX);
+            hv_cpuid_get_host(cs, HV_CPUID_VERSION, R_ECX);
         cpu->hyperv_version_id[3] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_VERSION, R_EDX);
+            hv_cpuid_get_host(cs, HV_CPUID_VERSION, R_EDX);
 
-        cpu->hv_max_vps = hv_cpuid_get_host(cpuid, HV_CPUID_IMPLEMENT_LIMITS,
+        cpu->hv_max_vps = hv_cpuid_get_host(cs, HV_CPUID_IMPLEMENT_LIMITS,
                                             R_EAX);
         cpu->hyperv_limits[0] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_IMPLEMENT_LIMITS, R_EBX);
+            hv_cpuid_get_host(cs, HV_CPUID_IMPLEMENT_LIMITS, R_EBX);
         cpu->hyperv_limits[1] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_IMPLEMENT_LIMITS, R_ECX);
+            hv_cpuid_get_host(cs, HV_CPUID_IMPLEMENT_LIMITS, R_ECX);
         cpu->hyperv_limits[2] =
-            hv_cpuid_get_host(cpuid, HV_CPUID_IMPLEMENT_LIMITS, R_EDX);
+            hv_cpuid_get_host(cs, HV_CPUID_IMPLEMENT_LIMITS, R_EDX);
 
         cpu->hyperv_spinlock_attempts =
-            hv_cpuid_get_host(cpuid, HV_CPUID_ENLIGHTMENT_INFO, R_EBX);
+            hv_cpuid_get_host(cs, HV_CPUID_ENLIGHTMENT_INFO, R_EBX);
     }
 
     /* Features */
-    r = hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_RELAXED);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_VAPIC);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_TIME);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_CRASH);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_RESET);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_VPINDEX);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_RUNTIME);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_SYNIC);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_STIMER);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_FREQUENCIES);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_REENLIGHTENMENT);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_TLBFLUSH);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_EVMCS);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_IPI);
-    r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_STIMER_DIRECT);
+    r = hv_cpuid_check_and_set(cs, HYPERV_FEAT_RELAXED);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_VAPIC);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_TIME);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_CRASH);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_RESET);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_VPINDEX);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_RUNTIME);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_SYNIC);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_STIMER);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_FREQUENCIES);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_REENLIGHTENMENT);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_TLBFLUSH);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_EVMCS);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_IPI);
+    r |= hv_cpuid_check_and_set(cs, HYPERV_FEAT_STIMER_DIRECT);
 
     /* Additional dependencies not covered by kvm_hyperv_properties[] */
     if (hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNIC) &&
@@ -1281,8 +1289,7 @@ static int hyperv_handle_properties(CPUState *cs,
     }
 
     if (r) {
-        r = -ENOSYS;
-        goto free;
+        return -ENOSYS;
     }
 
     c = &cpuid_ent[cpuid_i++];
@@ -1324,7 +1331,7 @@ static int hyperv_handle_properties(CPUState *cs,
     if (cpu->hyperv_no_nonarch_cs == ON_OFF_AUTO_ON) {
         c->eax |= HV_NO_NONARCH_CORESHARING;
     } else if (cpu->hyperv_no_nonarch_cs == ON_OFF_AUTO_AUTO) {
-        c->eax |= hv_cpuid_get_host(cpuid, HV_CPUID_ENLIGHTMENT_INFO, R_EAX) &
+        c->eax |= hv_cpuid_get_host(cs, HV_CPUID_ENLIGHTMENT_INFO, R_EAX) &
             HV_NO_NONARCH_CORESHARING;
     }
 
@@ -1349,12 +1356,8 @@ static int hyperv_handle_properties(CPUState *cs,
         c->function = HV_CPUID_NESTED_FEATURES;
         c->eax = cpu->hyperv_nested[0];
     }
-    r = cpuid_i;
 
-free:
-    g_free(cpuid);
-
-    return r;
+    return cpuid_i;
 }
 
 static Error *hv_passthrough_mig_blocker;
-- 
2.25.4



  parent reply	other threads:[~2020-10-09 12:35 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-09 12:18 [PATCH RFC v3 00/23] i386: KVM: expand Hyper-V features early Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 01/23] WIP: update linux/headers Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 02/23] i386: fill in FEAT_HYPERV_EDX from edx instead of eax Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 03/23] i386: drop x86_cpu_get_supported_feature_word() forward declaration Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 04/23] i386: move hyperv_vendor_id initialization to x86_cpu_realizefn() Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 05/23] i386: move hyperv_interface_id " Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 06/23] i386: move hyperv_version_id " Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 07/23] i386: move hyperv_limits " Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 08/23] i386: keep hyperv_vendor string up-to-date Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 09/23] i386: invert hyperv_spinlock_attempts setting logic with hv_passthrough Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 10/23] i386: always fill Hyper-V CPUID feature leaves from X86CPU data Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 11/23] i386: stop using env->features[] for filling Hyper-V CPUIDs Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 12/23] i386: introduce hyperv_feature_supported() Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 13/23] i386: introduce hv_cpuid_get_host() Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 14/23] i386: drop FEAT_HYPERV feature leaves Vitaly Kuznetsov
2020-10-09 12:18 ` Vitaly Kuznetsov [this message]
2020-10-09 12:18 ` [PATCH RFC v3 16/23] i386: split hyperv_handle_properties() into hyperv_expand_features()/hyperv_fill_cpuids() Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 17/23] i386: move eVMCS enablement to hyperv_init_vcpu() Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 18/23] i386: switch hyperv_expand_features() to using error_setg() Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 19/23] i386: adjust the expected KVM_GET_SUPPORTED_HV_CPUID array size Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 20/23] i386: prefer system KVM_GET_SUPPORTED_HV_CPUID ioctl over vCPU's one Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 21/23] i386: use global kvm_state in hyperv_enabled() check Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 22/23] i386: expand Hyper-V features during CPU feature expansion time Vitaly Kuznetsov
2020-10-09 12:18 ` [PATCH RFC v3 23/23] i386: provide simple 'hyperv=on' option to x86 machine types Vitaly Kuznetsov
2020-11-18 22:25   ` Eduardo Habkost
2020-11-19  8:52     ` Vitaly Kuznetsov

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