Re: [PATCH 7/7] kvm x86: report 1GB page support to userspace

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

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index a1df2a3..6593198 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -542,6 +542,8 @@ struct kvm_x86_ops {
 	int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
 	int (*get_tdp_level)(void);
 	int (*get_mt_mask_shift)(void);
+
+	bool (*gb_page_enable)(void);
 };

Should enable unconditionally. Of course we need to find the shadow bug first, may be the has_wrprotected thingy.

diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index ee755e2..e79eb26 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -413,6 +413,7 @@ struct kvm_trace_rec {
 #define KVM_CAP_DEVICE_MSIX 28
 #endif
 #define KVM_CAP_ASSIGN_DEV_IRQ 29
+#define KVM_CAP_1GB_PAGES 30
#ifdef KVM_CAP_IRQ_ROUTING

Need KVM_GET_SUPPORTED_CPUID2 support as well.

--
error compiling committee.c: too many arguments to function

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