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authorKai Huang <kai.huang@intel.com>2024-11-15 22:52:40 +1300
committerPaolo Bonzini <pbonzini@redhat.com>2025-03-14 14:20:49 -0400
commit62b1fa69f31969e11d03529d3a80599ddda2d043 (patch)
treef9ecc36c2dffc9113ad4666db76d2200d799420b /virt
parentaed4dde24c8e10e579ad40d04333a13140d011fc (diff)
downloadlinux-62b1fa69f31969e11d03529d3a80599ddda2d043.tar.gz
KVM: Export hardware virtualization enabling/disabling functions
To support TDX, KVM will need to enable TDX during KVM module loading time. Enabling TDX requires enabling hardware virtualization first so that all online CPUs (and the new CPU going online) are in post-VMXON state. KVM by default enables hardware virtualization but that is done in kvm_init(), which must be the last step after all initialization is done thus is too late for enabling TDX. Export functions to enable/disable hardware virtualization so that TDX code can use them to handle hardware virtualization enabling before kvm_init(). Signed-off-by: Kai Huang <kai.huang@intel.com> Message-ID: <dfe17314c0d9978b7bc3b0833dff6f167fbd28f5.1731664295.git.kai.huang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c18
1 files changed, 4 insertions, 14 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index ba0327e2d0d333..6e40383fbe47fd 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -143,8 +143,6 @@ static int kvm_no_compat_open(struct inode *inode, struct file *file)
#define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl, \
.open = kvm_no_compat_open
#endif
-static int kvm_enable_virtualization(void);
-static void kvm_disable_virtualization(void);
static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
@@ -5576,7 +5574,7 @@ static struct syscore_ops kvm_syscore_ops = {
.shutdown = kvm_shutdown,
};
-static int kvm_enable_virtualization(void)
+int kvm_enable_virtualization(void)
{
int r;
@@ -5621,8 +5619,9 @@ err_cpuhp:
--kvm_usage_count;
return r;
}
+EXPORT_SYMBOL_GPL(kvm_enable_virtualization);
-static void kvm_disable_virtualization(void)
+void kvm_disable_virtualization(void)
{
guard(mutex)(&kvm_usage_lock);
@@ -5633,6 +5632,7 @@ static void kvm_disable_virtualization(void)
cpuhp_remove_state(CPUHP_AP_KVM_ONLINE);
kvm_arch_disable_virtualization();
}
+EXPORT_SYMBOL_GPL(kvm_disable_virtualization);
static int kvm_init_virtualization(void)
{
@@ -5648,21 +5648,11 @@ static void kvm_uninit_virtualization(void)
kvm_disable_virtualization();
}
#else /* CONFIG_KVM_GENERIC_HARDWARE_ENABLING */
-static int kvm_enable_virtualization(void)
-{
- return 0;
-}
-
static int kvm_init_virtualization(void)
{
return 0;
}
-static void kvm_disable_virtualization(void)
-{
-
-}
-
static void kvm_uninit_virtualization(void)
{