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KVM: report 1GB page support to userspace

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If userspace knows that the kernel part supports 1GB pages it can enable
the corresponding cpuid bit so that guests actually use GB pages.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2009-07-27 16:30:48 +02:00 committed by Avi Kivity
parent 04326caacf
commit 344f414fa0
4 changed files with 16 additions and 1 deletions
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2
arch/x86/include/asm/kvm_host.h
View File

@ -528,6 +528,8 @@ struct kvm_x86_ops {
int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
int (*get_tdp_level)(void);
u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
bool (*gb_page_enable)(void);
const struct trace_print_flags *exit_reasons_str;
};

6
arch/x86/kvm/svm.c
View File

@ -2754,6 +2754,11 @@ static const struct trace_print_flags svm_exit_reasons_str[] = {
{ -1, NULL }
};
static bool svm_gb_page_enable(void)
{
return true;
}
static struct kvm_x86_ops svm_x86_ops = {
.cpu_has_kvm_support = has_svm,
.disabled_by_bios = is_disabled,
@ -2817,6 +2822,7 @@ static struct kvm_x86_ops svm_x86_ops = {
.get_mt_mask = svm_get_mt_mask,
.exit_reasons_str = svm_exit_reasons_str,
.gb_page_enable = svm_gb_page_enable,
};
static int __init svm_init(void)

6
arch/x86/kvm/vmx.c
View File

@ -3908,6 +3908,11 @@ static const struct trace_print_flags vmx_exit_reasons_str[] = {
{ -1, NULL }
};
static bool vmx_gb_page_enable(void)
{
return false;
}
static struct kvm_x86_ops vmx_x86_ops = {
.cpu_has_kvm_support = cpu_has_kvm_support,
.disabled_by_bios = vmx_disabled_by_bios,
@ -3969,6 +3974,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
.get_mt_mask = vmx_get_mt_mask,
.exit_reasons_str = vmx_exit_reasons_str,
.gb_page_enable = vmx_gb_page_enable,
};
static int __init vmx_init(void)

3
arch/x86/kvm/x86.c
View File

@ -1444,6 +1444,7 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
u32 index, int *nent, int maxnent)
{
unsigned f_nx = is_efer_nx() ? F(NX) : 0;
unsigned f_gbpages = kvm_x86_ops->gb_page_enable() ? F(GBPAGES) : 0;
#ifdef CONFIG_X86_64
unsigned f_lm = F(LM);
#else
@ -1468,7 +1469,7 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
F(PAT) | F(PSE36) | 0 /* Reserved */ |
f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
F(FXSR) | F(FXSR_OPT) | 0 /* GBPAGES */ | 0 /* RDTSCP */ |
F(FXSR) | F(FXSR_OPT) | f_gbpages | 0 /* RDTSCP */ |
0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
/* cpuid 1.ecx */
const u32 kvm_supported_word4_x86_features =