From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 10 Mar 2020 10:22:47 +0000 (+0100)
Subject: kvm: add support for reading tsc frequency via cpuid.
X-Git-Tag: rel-1.14.0~39
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=34160e05257328a3e18200cccfe394e7aeb10be3;p=seabios.git

kvm: add support for reading tsc frequency via cpuid.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20200310102248.28412-3-kraxel@redhat.com
---

diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c
index ef42093..1e3d601 100644
--- a/src/fw/paravirt.c
+++ b/src/fw/paravirt.c
@@ -67,6 +67,11 @@ static void kvm_detect(void)
     if (strcmp(signature, "KVMKVMKVM") == 0) {
         dprintf(1, "Running on KVM\n");
         PlatformRunningOn |= PF_KVM;
+        if (eax >= KVM_CPUID_SIGNATURE + 0x10) {
+            cpuid(KVM_CPUID_SIGNATURE + 0x10, &eax, &ebx, &ecx, &edx);
+            dprintf(1, "kvm: have invtsc, freq %u kHz\n", eax);
+            tsctimer_setfreq(eax, "invtsc");
+        }
     }
 }