motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-07 17:53:56 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

target-i386: Add NPT support

Browse source 
This implements NPT suport for SVM by hooking into
x86_cpu_handle_mmu_fault where it reads the stage-1 page table. Whether
we need to perform this 2nd stage translation, and how, is decided
during vmrun and stored in hflags2, along with nested_cr3 and
nested_pg_mode.

As get_hphys performs a direct cpu_vmexit in case of NPT faults, we need
retaddr in that function. To avoid changing the signature of
cpu_handle_mmu_fault, this passes the value from tlb_fill to get_hphys
via the CPU state.

This was tested successfully via the Jailhouse hypervisor.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Message-Id: <567473a0-6005-5843-4c73-951f476085ca@web.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka 2018-06-30 08:08:23 +02:00 • committed by Paolo Bonzini
parent 76b004d10d
commit fe441054bb
7 changed files with 281 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

6
target/i386/cpu.h
View file

@ -211,6 +211,7 @@ typedef enum X86Seg {
#define HF2_VINTR_SHIFT 3 /* value of V_INTR_MASKING bit */
#define HF2_SMM_INSIDE_NMI_SHIFT 4 /* CPU serving SMI nested inside NMI */
#define HF2_MPX_PR_SHIFT 5 /* BNDCFGx.BNDPRESERVE */
#define HF2_NPT_SHIFT 6 /* Nested Paging enabled */
#define HF2_GIF_MASK (1 << HF2_GIF_SHIFT)
#define HF2_HIF_MASK (1 << HF2_HIF_SHIFT)
@ -218,6 +219,7 @@ typedef enum X86Seg {
#define HF2_VINTR_MASK (1 << HF2_VINTR_SHIFT)
#define HF2_SMM_INSIDE_NMI_MASK (1 << HF2_SMM_INSIDE_NMI_SHIFT)
#define HF2_MPX_PR_MASK (1 << HF2_MPX_PR_SHIFT)
#define HF2_NPT_MASK (1 << HF2_NPT_SHIFT)
#define CR0_PE_SHIFT 0
#define CR0_MP_SHIFT 1
@ -1265,12 +1267,16 @@ typedef struct CPUX86State {
uint16_t intercept_dr_read;
uint16_t intercept_dr_write;
uint32_t intercept_exceptions;
uint64_t nested_cr3;
uint32_t nested_pg_mode;
uint8_t v_tpr;
/* KVM states, automatically cleared on reset */
uint8_t nmi_injected;
uint8_t nmi_pending;
uintptr_t retaddr;
/* Fields up to this point are cleared by a CPU reset */
struct {} end_reset_fields;