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[Qemu-devel] [RFC 1/2] kvm: Implement kvm_arch_get_emulated_cpuid()
From: |
Eduardo Habkost |
Subject: |
[Qemu-devel] [RFC 1/2] kvm: Implement kvm_arch_get_emulated_cpuid() |
Date: |
Thu, 5 Jun 2014 13:12:20 -0300 |
From: Borislav Petkov <address@hidden>
Add support for the KVM_GET_EMULATED_CPUID ioctl and leave feature bits
enabled, when requested by userspace, if kvm emulates them.
Signed-off-by: Borislav Petkov <address@hidden>
[ehabkost: removed target-i386/cpu.c code, changed patch description]
Signed-off-by: Eduardo Habkost <address@hidden>
---
include/sysemu/kvm.h | 3 +++
target-i386/kvm.c | 38 ++++++++++++++++++++++++++++++++++----
2 files changed, 37 insertions(+), 4 deletions(-)
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index e7ad9d1..ab1ffdb 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -324,6 +324,9 @@ int kvm_check_extension(KVMState *s, unsigned int
extension);
uint32_t kvm_arch_get_supported_cpuid(KVMState *env, uint32_t function,
uint32_t index, int reg);
+uint32_t kvm_arch_get_emulated_cpuid(KVMState *env, uint32_t function,
+ uint32_t index, int reg);
+
#if !defined(CONFIG_USER_ONLY)
int kvm_physical_memory_addr_from_host(KVMState *s, void *ram_addr,
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index f9ffa4b..242df34 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -88,7 +88,7 @@ bool kvm_allows_irq0_override(void)
return !kvm_irqchip_in_kernel() || kvm_has_gsi_routing();
}
-static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
+static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int ioctl, int max)
{
struct kvm_cpuid2 *cpuid;
int r, size;
@@ -96,7 +96,7 @@ static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
size = sizeof(*cpuid) + max * sizeof(*cpuid->entries);
cpuid = (struct kvm_cpuid2 *)g_malloc0(size);
cpuid->nent = max;
- r = kvm_ioctl(s, KVM_GET_SUPPORTED_CPUID, cpuid);
+ r = kvm_ioctl(s, ioctl, cpuid);
if (r == 0 && cpuid->nent >= max) {
r = -E2BIG;
}
@@ -105,7 +105,10 @@ static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int
max)
g_free(cpuid);
return NULL;
} else {
- fprintf(stderr, "KVM_GET_SUPPORTED_CPUID failed: %s\n",
+ fprintf(stderr, "%s failed: %s\n",
+ (ioctl == (int)KVM_GET_SUPPORTED_CPUID
+ ? "KVM_GET_SUPPORTED_CPUID"
+ : "KVM_GET_EMULATED_CPUID"),
strerror(-r));
exit(1);
}
@@ -120,7 +123,17 @@ static struct kvm_cpuid2 *get_supported_cpuid(KVMState *s)
{
struct kvm_cpuid2 *cpuid;
int max = 1;
- while ((cpuid = try_get_cpuid(s, max)) == NULL) {
+ while ((cpuid = try_get_cpuid(s, KVM_GET_SUPPORTED_CPUID, max)) == NULL) {
+ max *= 2;
+ }
+ return cpuid;
+}
+
+static struct kvm_cpuid2 *get_emulated_cpuid(KVMState *s)
+{
+ struct kvm_cpuid2 *cpuid;
+ int max = 1;
+ while ((cpuid = try_get_cpuid(s, KVM_GET_EMULATED_CPUID, max)) == NULL) {
max *= 2;
}
return cpuid;
@@ -248,6 +261,23 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s,
uint32_t function,
return ret;
}
+uint32_t kvm_arch_get_emulated_cpuid(KVMState *s, uint32_t function,
+ uint32_t index, int reg)
+{
+ struct kvm_cpuid2 *cpuid __attribute__((unused));
+
+ if (!kvm_check_extension(s, KVM_CAP_EXT_EMUL_CPUID))
+ return 0;
+
+ cpuid = get_emulated_cpuid(s);
+
+ struct kvm_cpuid_entry2 *entry = cpuid_find_entry(cpuid, function, index);
+ if (entry)
+ return cpuid_entry_get_reg(entry, reg);
+
+ return 0;
+}
+
typedef struct HWPoisonPage {
ram_addr_t ram_addr;
QLIST_ENTRY(HWPoisonPage) list;
--
1.9.0
- [Qemu-devel] [RFC 0/2] GET_EMULATED_CPUID support with "allow-emulation" option, Eduardo Habkost, 2014/06/05
- [Qemu-devel] [RFC 1/2] kvm: Implement kvm_arch_get_emulated_cpuid(),
Eduardo Habkost <=
- [Qemu-devel] [RFC 2/2] target-i386: Add "allow-emulation" X86CPU property, Eduardo Habkost, 2014/06/05
- Re: [Qemu-devel] [RFC 0/2] GET_EMULATED_CPUID support with "allow-emulation" option, Alexander Graf, 2014/06/05
- Re: [Qemu-devel] [RFC 0/2] GET_EMULATED_CPUID support with "allow-emulation" option, Paolo Bonzini, 2014/06/05
- Re: [Qemu-devel] [RFC 0/2] GET_EMULATED_CPUID support with "allow-emulation" option, Alexander Graf, 2014/06/05
- Re: [Qemu-devel] [RFC 0/2] GET_EMULATED_CPUID support with "allow-emulation" option, Paolo Bonzini, 2014/06/05
- Re: [Qemu-devel] [RFC 0/2] GET_EMULATED_CPUID support with "allow-emulation" option, Alexander Graf, 2014/06/05
- Re: [Qemu-devel] [RFC 0/2] GET_EMULATED_CPUID support with "allow-emulation" option, Paolo Bonzini, 2014/06/05
- Re: [Qemu-devel] [RFC 0/2] GET_EMULATED_CPUID support with "allow-emulation" option, Alexander Graf, 2014/06/05