[PATCH v3 05/12] KVM: VMX: Add a TSC multiplier field in VMCS12

Ilias Stamatis
2021-05-21T10:27:52Z

This is required for supporting nested TSC scaling.

Signed-off-by: Ilias Stamatis <ilstam@amazon.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/vmx/vmcs12.c | 1 +
arch/x86/kvm/vmx/vmcs12.h | 4 +++-
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmcs12.c b/arch/x86/kvm/vmx/vmcs12.c
index 034adb6404dc..d9f5d7c56ae3 100644
--- a/arch/x86/kvm/vmx/vmcs12.c
+++ b/arch/x86/kvm/vmx/vmcs12.c
@@ -37,6 +37,7 @@ const unsigned short vmcs_field_to_offset_table[] = {
FIELD64(VM_ENTRY_MSR_LOAD_ADDR, vm_entry_msr_load_addr),
FIELD64(PML_ADDRESS, pml_address),
FIELD64(TSC_OFFSET, tsc_offset),
+ FIELD64(TSC_MULTIPLIER, tsc_multiplier),
FIELD64(VIRTUAL_APIC_PAGE_ADDR, virtual_apic_page_addr),
FIELD64(APIC_ACCESS_ADDR, apic_access_addr),
FIELD64(POSTED_INTR_DESC_ADDR, posted_intr_desc_addr),
diff --git a/arch/x86/kvm/vmx/vmcs12.h b/arch/x86/kvm/vmx/vmcs12.h
index 13494956d0e9..bb81a23afe89 100644
--- a/arch/x86/kvm/vmx/vmcs12.h
+++ b/arch/x86/kvm/vmx/vmcs12.h
@@ -70,7 +70,8 @@ struct __packed vmcs12 {
u64 eptp_list_address;
u64 pml_address;
u64 encls_exiting_bitmap;
- u64 padding64[2]; /* room for future expansion */
+ u64 tsc_multiplier;
+ u64 padding64[1]; /* room for future expansion */
/*
* To allow migration of L1 (complete with its L2 guests) between
* machines of different natural widths (32 or 64 bit), we cannot have
@@ -258,6 +259,7 @@ static inline void vmx_check_vmcs12_offsets(void)
CHECK_OFFSET(eptp_list_address, 304);
CHECK_OFFSET(pml_address, 312);
CHECK_OFFSET(encls_exiting_bitmap, 320);
+ CHECK_OFFSET(tsc_multiplier, 328);
CHECK_OFFSET(cr0_guest_host_mask, 344);
CHECK_OFFSET(cr4_guest_host_mask, 352);
CHECK_OFFSET(cr0_read_shadow, 360);
--
2.17.1