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Subject[186/200] KVM: x86: Add callback to let modules decide over some supported cpuid bits
2.6.34-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joerg Roedel <joerg.roedel@amd.com>

This patch adds the get_supported_cpuid callback to
kvm_x86_ops. It will be used in do_cpuid_ent to delegate the
decission about some supported cpuid bits to the
architecture modules.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

(Cherry-picked from commit d4330ef2fb2236a1e3a176f0f68360f4c0a8661b)
---
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/svm.c | 6 ++++++
arch/x86/kvm/vmx.c | 6 ++++++
arch/x86/kvm/x86.c | 3 +++
4 files changed, 17 insertions(+)

--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -541,6 +541,8 @@ struct kvm_x86_ops {
int (*get_lpage_level)(void);
bool (*rdtscp_supported)(void);

+ void (*set_supported_cpuid)(u32 func, struct kvm_cpuid_entry2 *entry);
+
const struct trace_print_flags *exit_reasons_str;
};

--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2907,6 +2907,10 @@ static void svm_cpuid_update(struct kvm_
{
}

+static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
+{
+}
+
static const struct trace_print_flags svm_exit_reasons_str[] = {
{ SVM_EXIT_READ_CR0, "read_cr0" },
{ SVM_EXIT_READ_CR3, "read_cr3" },
@@ -3051,6 +3055,8 @@ static struct kvm_x86_ops svm_x86_ops =
.cpuid_update = svm_cpuid_update,

.rdtscp_supported = svm_rdtscp_supported,
+
+ .set_supported_cpuid = svm_set_supported_cpuid,
};

static int __init svm_init(void)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4115,6 +4115,10 @@ static void vmx_cpuid_update(struct kvm_
}
}

+static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
+{
+}
+
static struct kvm_x86_ops vmx_x86_ops = {
.cpu_has_kvm_support = cpu_has_kvm_support,
.disabled_by_bios = vmx_disabled_by_bios,
@@ -4186,6 +4190,8 @@ static struct kvm_x86_ops vmx_x86_ops =
.cpuid_update = vmx_cpuid_update,

.rdtscp_supported = vmx_rdtscp_supported,
+
+ .set_supported_cpuid = vmx_set_supported_cpuid,
};

static int __init vmx_init(void)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1917,6 +1917,9 @@ static void do_cpuid_ent(struct kvm_cpui
entry->ecx &= kvm_supported_word6_x86_features;
break;
}
+
+ kvm_x86_ops->set_supported_cpuid(function, entry);
+
put_cpu();
}




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