* [PATCH v4 00/23] SMM emulation and interrupt shadow fixes
@ 2022-10-25 12:42 Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 01/23] KVM: x86: start moving SMM-related functions to new files Maxim Levitsky
` (16 more replies)
0 siblings, 17 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
This patch series is a result of long debug work to find out why
sometimes guests with win11 secure boot
were failing during boot.
During writing a unit test I found another bug, turns out
that on rsm emulation, if the rsm instruction was done in real
or 32 bit mode, KVM would truncate the restored RIP to 32 bit.
I also refactored the way we write SMRAM so it is easier
now to understand what is going on.
The main bug in this series which I fixed is that we
allowed #SMI to happen during the STI interrupt shadow,
and we did nothing to both reset it on #SMI handler
entry and restore it on RSM.
V4:
- rebased on top of patch series from Paolo which
allows smm support to be disabled by Kconfig option.
- addressed review feedback.
I included these patches in the series for reference.
Best regards,
Maxim Levitsky
Maxim Levitsky (15):
bug: introduce ASSERT_STRUCT_OFFSET
KVM: x86: emulator: em_sysexit should update ctxt->mode
KVM: x86: emulator: introduce emulator_recalc_and_set_mode
KVM: x86: emulator: update the emulation mode after rsm
KVM: x86: emulator: update the emulation mode after CR0 write
KVM: x86: smm: number of GPRs in the SMRAM image depends on the image
format
KVM: x86: smm: check for failures on smm entry
KVM: x86: smm: add structs for KVM's smram layout
KVM: x86: smm: use smram structs in the common code
KVM: x86: smm: use smram struct for 32 bit smram load/restore
KVM: x86: smm: use smram struct for 64 bit smram load/restore
KVM: svm: drop explicit return value of kvm_vcpu_map
KVM: x86: SVM: use smram structs
KVM: x86: SVM: don't save SVM state to SMRAM when VM is not long mode
capable
KVM: x86: smm: preserve interrupt shadow in SMRAM
Paolo Bonzini (8):
KVM: x86: start moving SMM-related functions to new files
KVM: x86: move SMM entry to a new file
KVM: x86: move SMM exit to a new file
KVM: x86: do not go through ctxt->ops when emulating rsm
KVM: allow compiling out SMM support
KVM: x86: compile out vendor-specific code if SMM is disabled
KVM: x86: remove SMRAM address space if SMM is not supported
KVM: x86: do not define KVM_REQ_SMI if SMM disabled
arch/x86/include/asm/kvm-x86-ops.h | 2 +
arch/x86/include/asm/kvm_host.h | 29 +-
arch/x86/kvm/Kconfig | 11 +
arch/x86/kvm/Makefile | 1 +
arch/x86/kvm/emulate.c | 458 +++----------
arch/x86/kvm/kvm_cache_regs.h | 5 -
arch/x86/kvm/kvm_emulate.h | 47 +-
arch/x86/kvm/lapic.c | 14 +-
arch/x86/kvm/lapic.h | 7 +-
arch/x86/kvm/mmu/mmu.c | 1 +
arch/x86/kvm/smm.c | 637 ++++++++++++++++++
arch/x86/kvm/smm.h | 160 +++++
arch/x86/kvm/svm/nested.c | 3 +
arch/x86/kvm/svm/svm.c | 43 +-
arch/x86/kvm/vmx/nested.c | 1 +
arch/x86/kvm/vmx/vmcs12.h | 5 +-
arch/x86/kvm/vmx/vmx.c | 11 +-
arch/x86/kvm/x86.c | 353 +---------
include/linux/build_bug.h | 9 +
tools/testing/selftests/kvm/x86_64/smm_test.c | 2 +
20 files changed, 1031 insertions(+), 768 deletions(-)
create mode 100644 arch/x86/kvm/smm.c
create mode 100644 arch/x86/kvm/smm.h
--
2.34.3
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v4 01/23] KVM: x86: start moving SMM-related functions to new files
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 02/23] KVM: x86: move SMM entry to a new file Maxim Levitsky
` (15 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
From: Paolo Bonzini <pbonzini@redhat.com>
Create a new header and source with code related to system management
mode emulation. Entry and exit will move there too; for now,
opportunistically rename put_smstate to PUT_SMSTATE while moving
it to smm.h, and adjust the SMM state saving code.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/include/asm/kvm_host.h | 6 --
arch/x86/kvm/Makefile | 1 +
arch/x86/kvm/emulate.c | 1 +
arch/x86/kvm/kvm_cache_regs.h | 5 --
arch/x86/kvm/lapic.c | 14 ++-
arch/x86/kvm/lapic.h | 7 +-
arch/x86/kvm/mmu/mmu.c | 1 +
arch/x86/kvm/smm.c | 37 ++++++++
arch/x86/kvm/smm.h | 25 ++++++
arch/x86/kvm/svm/nested.c | 1 +
arch/x86/kvm/svm/svm.c | 5 +-
arch/x86/kvm/vmx/nested.c | 1 +
arch/x86/kvm/vmx/vmx.c | 1 +
arch/x86/kvm/x86.c | 148 ++++++++++++--------------------
14 files changed, 138 insertions(+), 115 deletions(-)
create mode 100644 arch/x86/kvm/smm.c
create mode 100644 arch/x86/kvm/smm.h
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 7551b6f9c31c52..af9798681f88a1 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2084,12 +2084,6 @@ static inline int kvm_cpu_get_apicid(int mps_cpu)
#endif
}
-#define put_smstate(type, buf, offset, val) \
- *(type *)((buf) + (offset) - 0x7e00) = val
-
-#define GET_SMSTATE(type, buf, offset) \
- (*(type *)((buf) + (offset) - 0x7e00))
-
int kvm_cpu_dirty_log_size(void);
int memslot_rmap_alloc(struct kvm_memory_slot *slot, unsigned long npages);
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 30f244b6452349..ec6f7656254b9f 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -20,6 +20,7 @@ endif
kvm-$(CONFIG_X86_64) += mmu/tdp_iter.o mmu/tdp_mmu.o
kvm-$(CONFIG_KVM_XEN) += xen.o
+kvm-y += smm.o
kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \
vmx/evmcs.o vmx/nested.o vmx/posted_intr.o
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 3b27622d46425b..de09660a61e522 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -30,6 +30,7 @@
#include "tss.h"
#include "mmu.h"
#include "pmu.h"
+#include "smm.h"
/*
* Operand types
diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h
index 3febc342360cc7..c09174f73a344f 100644
--- a/arch/x86/kvm/kvm_cache_regs.h
+++ b/arch/x86/kvm/kvm_cache_regs.h
@@ -200,9 +200,4 @@ static inline bool is_guest_mode(struct kvm_vcpu *vcpu)
return vcpu->arch.hflags & HF_GUEST_MASK;
}
-static inline bool is_smm(struct kvm_vcpu *vcpu)
-{
- return vcpu->arch.hflags & HF_SMM_MASK;
-}
-
#endif
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index d7639d126e6c7a..e636d8c681f4bb 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -42,6 +42,7 @@
#include "x86.h"
#include "cpuid.h"
#include "hyperv.h"
+#include "smm.h"
#ifndef CONFIG_X86_64
#define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
@@ -1170,9 +1171,10 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
break;
case APIC_DM_SMI:
- result = 1;
- kvm_make_request(KVM_REQ_SMI, vcpu);
- kvm_vcpu_kick(vcpu);
+ if (!kvm_inject_smi(vcpu)) {
+ kvm_vcpu_kick(vcpu);
+ result = 1;
+ }
break;
case APIC_DM_NMI:
@@ -3020,6 +3022,12 @@ int kvm_lapic_set_pv_eoi(struct kvm_vcpu *vcpu, u64 data, unsigned long len)
return 0;
}
+bool kvm_apic_init_sipi_allowed(struct kvm_vcpu *vcpu)
+{
+ return !is_smm(vcpu) &&
+ !static_call(kvm_x86_apic_init_signal_blocked)(vcpu);
+}
+
int kvm_apic_accept_events(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index a5ac4a5a517920..cb7e68c93e1a23 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -7,7 +7,6 @@
#include <linux/kvm_host.h>
#include "hyperv.h"
-#include "kvm_cache_regs.h"
#define KVM_APIC_INIT 0
#define KVM_APIC_SIPI 1
@@ -229,11 +228,7 @@ static inline bool kvm_apic_has_pending_init_or_sipi(struct kvm_vcpu *vcpu)
return lapic_in_kernel(vcpu) && vcpu->arch.apic->pending_events;
}
-static inline bool kvm_apic_init_sipi_allowed(struct kvm_vcpu *vcpu)
-{
- return !is_smm(vcpu) &&
- !static_call(kvm_x86_apic_init_signal_blocked)(vcpu);
-}
+bool kvm_apic_init_sipi_allowed(struct kvm_vcpu *vcpu);
static inline bool kvm_lowest_prio_delivery(struct kvm_lapic_irq *irq)
{
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 6f81539061d648..6a30d67fadb4d6 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -22,6 +22,7 @@
#include "tdp_mmu.h"
#include "x86.h"
#include "kvm_cache_regs.h"
+#include "smm.h"
#include "kvm_emulate.h"
#include "cpuid.h"
#include "spte.h"
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
new file mode 100644
index 00000000000000..b91c48d91f6ed9
--- /dev/null
+++ b/arch/x86/kvm/smm.c
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/kvm_host.h>
+#include "x86.h"
+#include "kvm_cache_regs.h"
+#include "kvm_emulate.h"
+#include "smm.h"
+#include "trace.h"
+
+void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm)
+{
+ trace_kvm_smm_transition(vcpu->vcpu_id, vcpu->arch.smbase, entering_smm);
+
+ if (entering_smm) {
+ vcpu->arch.hflags |= HF_SMM_MASK;
+ } else {
+ vcpu->arch.hflags &= ~(HF_SMM_MASK | HF_SMM_INSIDE_NMI_MASK);
+
+ /* Process a latched INIT or SMI, if any. */
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
+
+ /*
+ * Even if KVM_SET_SREGS2 loaded PDPTRs out of band,
+ * on SMM exit we still need to reload them from
+ * guest memory
+ */
+ vcpu->arch.pdptrs_from_userspace = false;
+ }
+
+ kvm_mmu_reset_context(vcpu);
+}
+
+void process_smi(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.smi_pending = true;
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
+}
diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h
new file mode 100644
index 00000000000000..d85d4ccd32dd13
--- /dev/null
+++ b/arch/x86/kvm/smm.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ASM_KVM_SMM_H
+#define ASM_KVM_SMM_H
+
+#define GET_SMSTATE(type, buf, offset) \
+ (*(type *)((buf) + (offset) - 0x7e00))
+
+#define PUT_SMSTATE(type, buf, offset, val) \
+ *(type *)((buf) + (offset) - 0x7e00) = val
+
+static inline int kvm_inject_smi(struct kvm_vcpu *vcpu)
+{
+ kvm_make_request(KVM_REQ_SMI, vcpu);
+ return 0;
+}
+
+static inline bool is_smm(struct kvm_vcpu *vcpu)
+{
+ return vcpu->arch.hflags & HF_SMM_MASK;
+}
+
+void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm);
+void process_smi(struct kvm_vcpu *vcpu);
+
+#endif
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 4c620999d230a5..cc0fd75f7cbab5 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -25,6 +25,7 @@
#include "trace.h"
#include "mmu.h"
#include "x86.h"
+#include "smm.h"
#include "cpuid.h"
#include "lapic.h"
#include "svm.h"
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 58f0077d935799..496ee7d1ae2fb7 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -6,6 +6,7 @@
#include "mmu.h"
#include "kvm_cache_regs.h"
#include "x86.h"
+#include "smm.h"
#include "cpuid.h"
#include "pmu.h"
@@ -4442,9 +4443,9 @@ static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
return 0;
/* FED8h - SVM Guest */
- put_smstate(u64, smstate, 0x7ed8, 1);
+ PUT_SMSTATE(u64, smstate, 0x7ed8, 1);
/* FEE0h - SVM Guest VMCB Physical Address */
- put_smstate(u64, smstate, 0x7ee0, svm->nested.vmcb12_gpa);
+ PUT_SMSTATE(u64, smstate, 0x7ee0, svm->nested.vmcb12_gpa);
svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 8f67a9c4a28706..29215925e75b11 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -16,6 +16,7 @@
#include "trace.h"
#include "vmx.h"
#include "x86.h"
+#include "smm.h"
static bool __read_mostly enable_shadow_vmcs = 1;
module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO);
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 9dba04b6b019ac..038809c6800601 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -66,6 +66,7 @@
#include "vmcs12.h"
#include "vmx.h"
#include "x86.h"
+#include "smm.h"
MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4bd5f8a751de91..6a5cebf7250826 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -30,6 +30,7 @@
#include "hyperv.h"
#include "lapic.h"
#include "xen.h"
+#include "smm.h"
#include <linux/clocksource.h>
#include <linux/interrupt.h>
@@ -119,7 +120,6 @@ static u64 __read_mostly cr4_reserved_bits = CR4_RESERVED_BITS;
static void update_cr8_intercept(struct kvm_vcpu *vcpu);
static void process_nmi(struct kvm_vcpu *vcpu);
-static void process_smi(struct kvm_vcpu *vcpu);
static void enter_smm(struct kvm_vcpu *vcpu);
static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
static void store_regs(struct kvm_vcpu *vcpu);
@@ -4896,13 +4896,6 @@ static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
return 0;
}
-static int kvm_vcpu_ioctl_smi(struct kvm_vcpu *vcpu)
-{
- kvm_make_request(KVM_REQ_SMI, vcpu);
-
- return 0;
-}
-
static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
struct kvm_tpr_access_ctl *tac)
{
@@ -5125,8 +5118,6 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
memset(&events->reserved, 0, sizeof(events->reserved));
}
-static void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm);
-
static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
struct kvm_vcpu_events *events)
{
@@ -5579,7 +5570,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
break;
}
case KVM_SMI: {
- r = kvm_vcpu_ioctl_smi(vcpu);
+ r = kvm_inject_smi(vcpu);
break;
}
case KVM_SET_CPUID: {
@@ -8527,29 +8518,6 @@ static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
static int complete_emulated_mmio(struct kvm_vcpu *vcpu);
static int complete_emulated_pio(struct kvm_vcpu *vcpu);
-static void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm)
-{
- trace_kvm_smm_transition(vcpu->vcpu_id, vcpu->arch.smbase, entering_smm);
-
- if (entering_smm) {
- vcpu->arch.hflags |= HF_SMM_MASK;
- } else {
- vcpu->arch.hflags &= ~(HF_SMM_MASK | HF_SMM_INSIDE_NMI_MASK);
-
- /* Process a latched INIT or SMI, if any. */
- kvm_make_request(KVM_REQ_EVENT, vcpu);
-
- /*
- * Even if KVM_SET_SREGS2 loaded PDPTRs out of band,
- * on SMM exit we still need to reload them from
- * guest memory
- */
- vcpu->arch.pdptrs_from_userspace = false;
- }
-
- kvm_mmu_reset_context(vcpu);
-}
-
static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7,
unsigned long *db)
{
@@ -10033,16 +10001,16 @@ static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n)
int offset;
kvm_get_segment(vcpu, &seg, n);
- put_smstate(u32, buf, 0x7fa8 + n * 4, seg.selector);
+ PUT_SMSTATE(u32, buf, 0x7fa8 + n * 4, seg.selector);
if (n < 3)
offset = 0x7f84 + n * 12;
else
offset = 0x7f2c + (n - 3) * 12;
- put_smstate(u32, buf, offset + 8, seg.base);
- put_smstate(u32, buf, offset + 4, seg.limit);
- put_smstate(u32, buf, offset, enter_smm_get_segment_flags(&seg));
+ PUT_SMSTATE(u32, buf, offset + 8, seg.base);
+ PUT_SMSTATE(u32, buf, offset + 4, seg.limit);
+ PUT_SMSTATE(u32, buf, offset, enter_smm_get_segment_flags(&seg));
}
#ifdef CONFIG_X86_64
@@ -10056,10 +10024,10 @@ static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n)
offset = 0x7e00 + n * 16;
flags = enter_smm_get_segment_flags(&seg) >> 8;
- put_smstate(u16, buf, offset, seg.selector);
- put_smstate(u16, buf, offset + 2, flags);
- put_smstate(u32, buf, offset + 4, seg.limit);
- put_smstate(u64, buf, offset + 8, seg.base);
+ PUT_SMSTATE(u16, buf, offset, seg.selector);
+ PUT_SMSTATE(u16, buf, offset + 2, flags);
+ PUT_SMSTATE(u32, buf, offset + 4, seg.limit);
+ PUT_SMSTATE(u64, buf, offset + 8, seg.base);
}
#endif
@@ -10070,47 +10038,47 @@ static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf)
unsigned long val;
int i;
- put_smstate(u32, buf, 0x7ffc, kvm_read_cr0(vcpu));
- put_smstate(u32, buf, 0x7ff8, kvm_read_cr3(vcpu));
- put_smstate(u32, buf, 0x7ff4, kvm_get_rflags(vcpu));
- put_smstate(u32, buf, 0x7ff0, kvm_rip_read(vcpu));
+ PUT_SMSTATE(u32, buf, 0x7ffc, kvm_read_cr0(vcpu));
+ PUT_SMSTATE(u32, buf, 0x7ff8, kvm_read_cr3(vcpu));
+ PUT_SMSTATE(u32, buf, 0x7ff4, kvm_get_rflags(vcpu));
+ PUT_SMSTATE(u32, buf, 0x7ff0, kvm_rip_read(vcpu));
for (i = 0; i < 8; i++)
- put_smstate(u32, buf, 0x7fd0 + i * 4, kvm_register_read_raw(vcpu, i));
+ PUT_SMSTATE(u32, buf, 0x7fd0 + i * 4, kvm_register_read_raw(vcpu, i));
kvm_get_dr(vcpu, 6, &val);
- put_smstate(u32, buf, 0x7fcc, (u32)val);
+ PUT_SMSTATE(u32, buf, 0x7fcc, (u32)val);
kvm_get_dr(vcpu, 7, &val);
- put_smstate(u32, buf, 0x7fc8, (u32)val);
+ PUT_SMSTATE(u32, buf, 0x7fc8, (u32)val);
kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
- put_smstate(u32, buf, 0x7fc4, seg.selector);
- put_smstate(u32, buf, 0x7f64, seg.base);
- put_smstate(u32, buf, 0x7f60, seg.limit);
- put_smstate(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg));
+ PUT_SMSTATE(u32, buf, 0x7fc4, seg.selector);
+ PUT_SMSTATE(u32, buf, 0x7f64, seg.base);
+ PUT_SMSTATE(u32, buf, 0x7f60, seg.limit);
+ PUT_SMSTATE(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg));
kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
- put_smstate(u32, buf, 0x7fc0, seg.selector);
- put_smstate(u32, buf, 0x7f80, seg.base);
- put_smstate(u32, buf, 0x7f7c, seg.limit);
- put_smstate(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg));
+ PUT_SMSTATE(u32, buf, 0x7fc0, seg.selector);
+ PUT_SMSTATE(u32, buf, 0x7f80, seg.base);
+ PUT_SMSTATE(u32, buf, 0x7f7c, seg.limit);
+ PUT_SMSTATE(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg));
static_call(kvm_x86_get_gdt)(vcpu, &dt);
- put_smstate(u32, buf, 0x7f74, dt.address);
- put_smstate(u32, buf, 0x7f70, dt.size);
+ PUT_SMSTATE(u32, buf, 0x7f74, dt.address);
+ PUT_SMSTATE(u32, buf, 0x7f70, dt.size);
static_call(kvm_x86_get_idt)(vcpu, &dt);
- put_smstate(u32, buf, 0x7f58, dt.address);
- put_smstate(u32, buf, 0x7f54, dt.size);
+ PUT_SMSTATE(u32, buf, 0x7f58, dt.address);
+ PUT_SMSTATE(u32, buf, 0x7f54, dt.size);
for (i = 0; i < 6; i++)
enter_smm_save_seg_32(vcpu, buf, i);
- put_smstate(u32, buf, 0x7f14, kvm_read_cr4(vcpu));
+ PUT_SMSTATE(u32, buf, 0x7f14, kvm_read_cr4(vcpu));
/* revision id */
- put_smstate(u32, buf, 0x7efc, 0x00020000);
- put_smstate(u32, buf, 0x7ef8, vcpu->arch.smbase);
+ PUT_SMSTATE(u32, buf, 0x7efc, 0x00020000);
+ PUT_SMSTATE(u32, buf, 0x7ef8, vcpu->arch.smbase);
}
#ifdef CONFIG_X86_64
@@ -10122,46 +10090,46 @@ static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf)
int i;
for (i = 0; i < 16; i++)
- put_smstate(u64, buf, 0x7ff8 - i * 8, kvm_register_read_raw(vcpu, i));
+ PUT_SMSTATE(u64, buf, 0x7ff8 - i * 8, kvm_register_read_raw(vcpu, i));
- put_smstate(u64, buf, 0x7f78, kvm_rip_read(vcpu));
- put_smstate(u32, buf, 0x7f70, kvm_get_rflags(vcpu));
+ PUT_SMSTATE(u64, buf, 0x7f78, kvm_rip_read(vcpu));
+ PUT_SMSTATE(u32, buf, 0x7f70, kvm_get_rflags(vcpu));
kvm_get_dr(vcpu, 6, &val);
- put_smstate(u64, buf, 0x7f68, val);
+ PUT_SMSTATE(u64, buf, 0x7f68, val);
kvm_get_dr(vcpu, 7, &val);
- put_smstate(u64, buf, 0x7f60, val);
+ PUT_SMSTATE(u64, buf, 0x7f60, val);
- put_smstate(u64, buf, 0x7f58, kvm_read_cr0(vcpu));
- put_smstate(u64, buf, 0x7f50, kvm_read_cr3(vcpu));
- put_smstate(u64, buf, 0x7f48, kvm_read_cr4(vcpu));
+ PUT_SMSTATE(u64, buf, 0x7f58, kvm_read_cr0(vcpu));
+ PUT_SMSTATE(u64, buf, 0x7f50, kvm_read_cr3(vcpu));
+ PUT_SMSTATE(u64, buf, 0x7f48, kvm_read_cr4(vcpu));
- put_smstate(u32, buf, 0x7f00, vcpu->arch.smbase);
+ PUT_SMSTATE(u32, buf, 0x7f00, vcpu->arch.smbase);
/* revision id */
- put_smstate(u32, buf, 0x7efc, 0x00020064);
+ PUT_SMSTATE(u32, buf, 0x7efc, 0x00020064);
- put_smstate(u64, buf, 0x7ed0, vcpu->arch.efer);
+ PUT_SMSTATE(u64, buf, 0x7ed0, vcpu->arch.efer);
kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
- put_smstate(u16, buf, 0x7e90, seg.selector);
- put_smstate(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8);
- put_smstate(u32, buf, 0x7e94, seg.limit);
- put_smstate(u64, buf, 0x7e98, seg.base);
+ PUT_SMSTATE(u16, buf, 0x7e90, seg.selector);
+ PUT_SMSTATE(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8);
+ PUT_SMSTATE(u32, buf, 0x7e94, seg.limit);
+ PUT_SMSTATE(u64, buf, 0x7e98, seg.base);
static_call(kvm_x86_get_idt)(vcpu, &dt);
- put_smstate(u32, buf, 0x7e84, dt.size);
- put_smstate(u64, buf, 0x7e88, dt.address);
+ PUT_SMSTATE(u32, buf, 0x7e84, dt.size);
+ PUT_SMSTATE(u64, buf, 0x7e88, dt.address);
kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
- put_smstate(u16, buf, 0x7e70, seg.selector);
- put_smstate(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8);
- put_smstate(u32, buf, 0x7e74, seg.limit);
- put_smstate(u64, buf, 0x7e78, seg.base);
+ PUT_SMSTATE(u16, buf, 0x7e70, seg.selector);
+ PUT_SMSTATE(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8);
+ PUT_SMSTATE(u32, buf, 0x7e74, seg.limit);
+ PUT_SMSTATE(u64, buf, 0x7e78, seg.base);
static_call(kvm_x86_get_gdt)(vcpu, &dt);
- put_smstate(u32, buf, 0x7e64, dt.size);
- put_smstate(u64, buf, 0x7e68, dt.address);
+ PUT_SMSTATE(u32, buf, 0x7e64, dt.size);
+ PUT_SMSTATE(u64, buf, 0x7e68, dt.address);
for (i = 0; i < 6; i++)
enter_smm_save_seg_64(vcpu, buf, i);
@@ -10247,12 +10215,6 @@ static void enter_smm(struct kvm_vcpu *vcpu)
kvm_mmu_reset_context(vcpu);
}
-static void process_smi(struct kvm_vcpu *vcpu)
-{
- vcpu->arch.smi_pending = true;
- kvm_make_request(KVM_REQ_EVENT, vcpu);
-}
-
void kvm_make_scan_ioapic_request_mask(struct kvm *kvm,
unsigned long *vcpu_bitmap)
{
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 02/23] KVM: x86: move SMM entry to a new file
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 01/23] KVM: x86: start moving SMM-related functions to new files Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 03/23] KVM: x86: move SMM exit " Maxim Levitsky
` (14 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
From: Paolo Bonzini <pbonzini@redhat.com>
Some users of KVM implement the UEFI variable store through a paravirtual
device that does not require the "SMM lockbox" component of edk2, and
would like to compile out system management mode. In preparation for
that, move the SMM entry code out of x86.c and into a new file.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/smm.c | 235 +++++++++++++++++++++++++++++++
arch/x86/kvm/smm.h | 1 +
arch/x86/kvm/x86.c | 239 +-------------------------------
4 files changed, 239 insertions(+), 237 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index af9798681f88a1..4afed04fcc8241 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1839,6 +1839,7 @@ int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu);
int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu);
void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
+void kvm_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg);
void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector);
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index b91c48d91f6ed9..26a6859e421fe1 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -5,6 +5,7 @@
#include "kvm_cache_regs.h"
#include "kvm_emulate.h"
#include "smm.h"
+#include "cpuid.h"
#include "trace.h"
void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm)
@@ -35,3 +36,237 @@ void process_smi(struct kvm_vcpu *vcpu)
vcpu->arch.smi_pending = true;
kvm_make_request(KVM_REQ_EVENT, vcpu);
}
+
+static u32 enter_smm_get_segment_flags(struct kvm_segment *seg)
+{
+ u32 flags = 0;
+ flags |= seg->g << 23;
+ flags |= seg->db << 22;
+ flags |= seg->l << 21;
+ flags |= seg->avl << 20;
+ flags |= seg->present << 15;
+ flags |= seg->dpl << 13;
+ flags |= seg->s << 12;
+ flags |= seg->type << 8;
+ return flags;
+}
+
+static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n)
+{
+ struct kvm_segment seg;
+ int offset;
+
+ kvm_get_segment(vcpu, &seg, n);
+ PUT_SMSTATE(u32, buf, 0x7fa8 + n * 4, seg.selector);
+
+ if (n < 3)
+ offset = 0x7f84 + n * 12;
+ else
+ offset = 0x7f2c + (n - 3) * 12;
+
+ PUT_SMSTATE(u32, buf, offset + 8, seg.base);
+ PUT_SMSTATE(u32, buf, offset + 4, seg.limit);
+ PUT_SMSTATE(u32, buf, offset, enter_smm_get_segment_flags(&seg));
+}
+
+#ifdef CONFIG_X86_64
+static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n)
+{
+ struct kvm_segment seg;
+ int offset;
+ u16 flags;
+
+ kvm_get_segment(vcpu, &seg, n);
+ offset = 0x7e00 + n * 16;
+
+ flags = enter_smm_get_segment_flags(&seg) >> 8;
+ PUT_SMSTATE(u16, buf, offset, seg.selector);
+ PUT_SMSTATE(u16, buf, offset + 2, flags);
+ PUT_SMSTATE(u32, buf, offset + 4, seg.limit);
+ PUT_SMSTATE(u64, buf, offset + 8, seg.base);
+}
+#endif
+
+static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf)
+{
+ struct desc_ptr dt;
+ struct kvm_segment seg;
+ unsigned long val;
+ int i;
+
+ PUT_SMSTATE(u32, buf, 0x7ffc, kvm_read_cr0(vcpu));
+ PUT_SMSTATE(u32, buf, 0x7ff8, kvm_read_cr3(vcpu));
+ PUT_SMSTATE(u32, buf, 0x7ff4, kvm_get_rflags(vcpu));
+ PUT_SMSTATE(u32, buf, 0x7ff0, kvm_rip_read(vcpu));
+
+ for (i = 0; i < 8; i++)
+ PUT_SMSTATE(u32, buf, 0x7fd0 + i * 4, kvm_register_read_raw(vcpu, i));
+
+ kvm_get_dr(vcpu, 6, &val);
+ PUT_SMSTATE(u32, buf, 0x7fcc, (u32)val);
+ kvm_get_dr(vcpu, 7, &val);
+ PUT_SMSTATE(u32, buf, 0x7fc8, (u32)val);
+
+ kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
+ PUT_SMSTATE(u32, buf, 0x7fc4, seg.selector);
+ PUT_SMSTATE(u32, buf, 0x7f64, seg.base);
+ PUT_SMSTATE(u32, buf, 0x7f60, seg.limit);
+ PUT_SMSTATE(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg));
+
+ kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
+ PUT_SMSTATE(u32, buf, 0x7fc0, seg.selector);
+ PUT_SMSTATE(u32, buf, 0x7f80, seg.base);
+ PUT_SMSTATE(u32, buf, 0x7f7c, seg.limit);
+ PUT_SMSTATE(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg));
+
+ static_call(kvm_x86_get_gdt)(vcpu, &dt);
+ PUT_SMSTATE(u32, buf, 0x7f74, dt.address);
+ PUT_SMSTATE(u32, buf, 0x7f70, dt.size);
+
+ static_call(kvm_x86_get_idt)(vcpu, &dt);
+ PUT_SMSTATE(u32, buf, 0x7f58, dt.address);
+ PUT_SMSTATE(u32, buf, 0x7f54, dt.size);
+
+ for (i = 0; i < 6; i++)
+ enter_smm_save_seg_32(vcpu, buf, i);
+
+ PUT_SMSTATE(u32, buf, 0x7f14, kvm_read_cr4(vcpu));
+
+ /* revision id */
+ PUT_SMSTATE(u32, buf, 0x7efc, 0x00020000);
+ PUT_SMSTATE(u32, buf, 0x7ef8, vcpu->arch.smbase);
+}
+
+#ifdef CONFIG_X86_64
+static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf)
+{
+ struct desc_ptr dt;
+ struct kvm_segment seg;
+ unsigned long val;
+ int i;
+
+ for (i = 0; i < 16; i++)
+ PUT_SMSTATE(u64, buf, 0x7ff8 - i * 8, kvm_register_read_raw(vcpu, i));
+
+ PUT_SMSTATE(u64, buf, 0x7f78, kvm_rip_read(vcpu));
+ PUT_SMSTATE(u32, buf, 0x7f70, kvm_get_rflags(vcpu));
+
+ kvm_get_dr(vcpu, 6, &val);
+ PUT_SMSTATE(u64, buf, 0x7f68, val);
+ kvm_get_dr(vcpu, 7, &val);
+ PUT_SMSTATE(u64, buf, 0x7f60, val);
+
+ PUT_SMSTATE(u64, buf, 0x7f58, kvm_read_cr0(vcpu));
+ PUT_SMSTATE(u64, buf, 0x7f50, kvm_read_cr3(vcpu));
+ PUT_SMSTATE(u64, buf, 0x7f48, kvm_read_cr4(vcpu));
+
+ PUT_SMSTATE(u32, buf, 0x7f00, vcpu->arch.smbase);
+
+ /* revision id */
+ PUT_SMSTATE(u32, buf, 0x7efc, 0x00020064);
+
+ PUT_SMSTATE(u64, buf, 0x7ed0, vcpu->arch.efer);
+
+ kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
+ PUT_SMSTATE(u16, buf, 0x7e90, seg.selector);
+ PUT_SMSTATE(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8);
+ PUT_SMSTATE(u32, buf, 0x7e94, seg.limit);
+ PUT_SMSTATE(u64, buf, 0x7e98, seg.base);
+
+ static_call(kvm_x86_get_idt)(vcpu, &dt);
+ PUT_SMSTATE(u32, buf, 0x7e84, dt.size);
+ PUT_SMSTATE(u64, buf, 0x7e88, dt.address);
+
+ kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
+ PUT_SMSTATE(u16, buf, 0x7e70, seg.selector);
+ PUT_SMSTATE(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8);
+ PUT_SMSTATE(u32, buf, 0x7e74, seg.limit);
+ PUT_SMSTATE(u64, buf, 0x7e78, seg.base);
+
+ static_call(kvm_x86_get_gdt)(vcpu, &dt);
+ PUT_SMSTATE(u32, buf, 0x7e64, dt.size);
+ PUT_SMSTATE(u64, buf, 0x7e68, dt.address);
+
+ for (i = 0; i < 6; i++)
+ enter_smm_save_seg_64(vcpu, buf, i);
+}
+#endif
+
+void enter_smm(struct kvm_vcpu *vcpu)
+{
+ struct kvm_segment cs, ds;
+ struct desc_ptr dt;
+ unsigned long cr0;
+ char buf[512];
+
+ memset(buf, 0, 512);
+#ifdef CONFIG_X86_64
+ if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
+ enter_smm_save_state_64(vcpu, buf);
+ else
+#endif
+ enter_smm_save_state_32(vcpu, buf);
+
+ /*
+ * Give enter_smm() a chance to make ISA-specific changes to the vCPU
+ * state (e.g. leave guest mode) after we've saved the state into the
+ * SMM state-save area.
+ */
+ static_call(kvm_x86_enter_smm)(vcpu, buf);
+
+ kvm_smm_changed(vcpu, true);
+ kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
+
+ if (static_call(kvm_x86_get_nmi_mask)(vcpu))
+ vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
+ else
+ static_call(kvm_x86_set_nmi_mask)(vcpu, true);
+
+ kvm_set_rflags(vcpu, X86_EFLAGS_FIXED);
+ kvm_rip_write(vcpu, 0x8000);
+
+ cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG);
+ static_call(kvm_x86_set_cr0)(vcpu, cr0);
+ vcpu->arch.cr0 = cr0;
+
+ static_call(kvm_x86_set_cr4)(vcpu, 0);
+
+ /* Undocumented: IDT limit is set to zero on entry to SMM. */
+ dt.address = dt.size = 0;
+ static_call(kvm_x86_set_idt)(vcpu, &dt);
+
+ kvm_set_dr(vcpu, 7, DR7_FIXED_1);
+
+ cs.selector = (vcpu->arch.smbase >> 4) & 0xffff;
+ cs.base = vcpu->arch.smbase;
+
+ ds.selector = 0;
+ ds.base = 0;
+
+ cs.limit = ds.limit = 0xffffffff;
+ cs.type = ds.type = 0x3;
+ cs.dpl = ds.dpl = 0;
+ cs.db = ds.db = 0;
+ cs.s = ds.s = 1;
+ cs.l = ds.l = 0;
+ cs.g = ds.g = 1;
+ cs.avl = ds.avl = 0;
+ cs.present = ds.present = 1;
+ cs.unusable = ds.unusable = 0;
+ cs.padding = ds.padding = 0;
+
+ kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
+ kvm_set_segment(vcpu, &ds, VCPU_SREG_DS);
+ kvm_set_segment(vcpu, &ds, VCPU_SREG_ES);
+ kvm_set_segment(vcpu, &ds, VCPU_SREG_FS);
+ kvm_set_segment(vcpu, &ds, VCPU_SREG_GS);
+ kvm_set_segment(vcpu, &ds, VCPU_SREG_SS);
+
+#ifdef CONFIG_X86_64
+ if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
+ static_call(kvm_x86_set_efer)(vcpu, 0);
+#endif
+
+ kvm_update_cpuid_runtime(vcpu);
+ kvm_mmu_reset_context(vcpu);
+}
diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h
index d85d4ccd32dd13..aacc6dac2c99a1 100644
--- a/arch/x86/kvm/smm.h
+++ b/arch/x86/kvm/smm.h
@@ -20,6 +20,7 @@ static inline bool is_smm(struct kvm_vcpu *vcpu)
}
void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm);
+void enter_smm(struct kvm_vcpu *vcpu);
void process_smi(struct kvm_vcpu *vcpu);
#endif
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6a5cebf7250826..1f69f54d1dbc82 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -120,7 +120,6 @@ static u64 __read_mostly cr4_reserved_bits = CR4_RESERVED_BITS;
static void update_cr8_intercept(struct kvm_vcpu *vcpu);
static void process_nmi(struct kvm_vcpu *vcpu);
-static void enter_smm(struct kvm_vcpu *vcpu);
static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
static void store_regs(struct kvm_vcpu *vcpu);
static int sync_regs(struct kvm_vcpu *vcpu);
@@ -7056,8 +7055,8 @@ static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
return handled;
}
-static void kvm_set_segment(struct kvm_vcpu *vcpu,
- struct kvm_segment *var, int seg)
+void kvm_set_segment(struct kvm_vcpu *vcpu,
+ struct kvm_segment *var, int seg)
{
static_call(kvm_x86_set_segment)(vcpu, var, seg);
}
@@ -9981,240 +9980,6 @@ static void process_nmi(struct kvm_vcpu *vcpu)
kvm_make_request(KVM_REQ_EVENT, vcpu);
}
-static u32 enter_smm_get_segment_flags(struct kvm_segment *seg)
-{
- u32 flags = 0;
- flags |= seg->g << 23;
- flags |= seg->db << 22;
- flags |= seg->l << 21;
- flags |= seg->avl << 20;
- flags |= seg->present << 15;
- flags |= seg->dpl << 13;
- flags |= seg->s << 12;
- flags |= seg->type << 8;
- return flags;
-}
-
-static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n)
-{
- struct kvm_segment seg;
- int offset;
-
- kvm_get_segment(vcpu, &seg, n);
- PUT_SMSTATE(u32, buf, 0x7fa8 + n * 4, seg.selector);
-
- if (n < 3)
- offset = 0x7f84 + n * 12;
- else
- offset = 0x7f2c + (n - 3) * 12;
-
- PUT_SMSTATE(u32, buf, offset + 8, seg.base);
- PUT_SMSTATE(u32, buf, offset + 4, seg.limit);
- PUT_SMSTATE(u32, buf, offset, enter_smm_get_segment_flags(&seg));
-}
-
-#ifdef CONFIG_X86_64
-static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n)
-{
- struct kvm_segment seg;
- int offset;
- u16 flags;
-
- kvm_get_segment(vcpu, &seg, n);
- offset = 0x7e00 + n * 16;
-
- flags = enter_smm_get_segment_flags(&seg) >> 8;
- PUT_SMSTATE(u16, buf, offset, seg.selector);
- PUT_SMSTATE(u16, buf, offset + 2, flags);
- PUT_SMSTATE(u32, buf, offset + 4, seg.limit);
- PUT_SMSTATE(u64, buf, offset + 8, seg.base);
-}
-#endif
-
-static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf)
-{
- struct desc_ptr dt;
- struct kvm_segment seg;
- unsigned long val;
- int i;
-
- PUT_SMSTATE(u32, buf, 0x7ffc, kvm_read_cr0(vcpu));
- PUT_SMSTATE(u32, buf, 0x7ff8, kvm_read_cr3(vcpu));
- PUT_SMSTATE(u32, buf, 0x7ff4, kvm_get_rflags(vcpu));
- PUT_SMSTATE(u32, buf, 0x7ff0, kvm_rip_read(vcpu));
-
- for (i = 0; i < 8; i++)
- PUT_SMSTATE(u32, buf, 0x7fd0 + i * 4, kvm_register_read_raw(vcpu, i));
-
- kvm_get_dr(vcpu, 6, &val);
- PUT_SMSTATE(u32, buf, 0x7fcc, (u32)val);
- kvm_get_dr(vcpu, 7, &val);
- PUT_SMSTATE(u32, buf, 0x7fc8, (u32)val);
-
- kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
- PUT_SMSTATE(u32, buf, 0x7fc4, seg.selector);
- PUT_SMSTATE(u32, buf, 0x7f64, seg.base);
- PUT_SMSTATE(u32, buf, 0x7f60, seg.limit);
- PUT_SMSTATE(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg));
-
- kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
- PUT_SMSTATE(u32, buf, 0x7fc0, seg.selector);
- PUT_SMSTATE(u32, buf, 0x7f80, seg.base);
- PUT_SMSTATE(u32, buf, 0x7f7c, seg.limit);
- PUT_SMSTATE(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg));
-
- static_call(kvm_x86_get_gdt)(vcpu, &dt);
- PUT_SMSTATE(u32, buf, 0x7f74, dt.address);
- PUT_SMSTATE(u32, buf, 0x7f70, dt.size);
-
- static_call(kvm_x86_get_idt)(vcpu, &dt);
- PUT_SMSTATE(u32, buf, 0x7f58, dt.address);
- PUT_SMSTATE(u32, buf, 0x7f54, dt.size);
-
- for (i = 0; i < 6; i++)
- enter_smm_save_seg_32(vcpu, buf, i);
-
- PUT_SMSTATE(u32, buf, 0x7f14, kvm_read_cr4(vcpu));
-
- /* revision id */
- PUT_SMSTATE(u32, buf, 0x7efc, 0x00020000);
- PUT_SMSTATE(u32, buf, 0x7ef8, vcpu->arch.smbase);
-}
-
-#ifdef CONFIG_X86_64
-static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf)
-{
- struct desc_ptr dt;
- struct kvm_segment seg;
- unsigned long val;
- int i;
-
- for (i = 0; i < 16; i++)
- PUT_SMSTATE(u64, buf, 0x7ff8 - i * 8, kvm_register_read_raw(vcpu, i));
-
- PUT_SMSTATE(u64, buf, 0x7f78, kvm_rip_read(vcpu));
- PUT_SMSTATE(u32, buf, 0x7f70, kvm_get_rflags(vcpu));
-
- kvm_get_dr(vcpu, 6, &val);
- PUT_SMSTATE(u64, buf, 0x7f68, val);
- kvm_get_dr(vcpu, 7, &val);
- PUT_SMSTATE(u64, buf, 0x7f60, val);
-
- PUT_SMSTATE(u64, buf, 0x7f58, kvm_read_cr0(vcpu));
- PUT_SMSTATE(u64, buf, 0x7f50, kvm_read_cr3(vcpu));
- PUT_SMSTATE(u64, buf, 0x7f48, kvm_read_cr4(vcpu));
-
- PUT_SMSTATE(u32, buf, 0x7f00, vcpu->arch.smbase);
-
- /* revision id */
- PUT_SMSTATE(u32, buf, 0x7efc, 0x00020064);
-
- PUT_SMSTATE(u64, buf, 0x7ed0, vcpu->arch.efer);
-
- kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
- PUT_SMSTATE(u16, buf, 0x7e90, seg.selector);
- PUT_SMSTATE(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8);
- PUT_SMSTATE(u32, buf, 0x7e94, seg.limit);
- PUT_SMSTATE(u64, buf, 0x7e98, seg.base);
-
- static_call(kvm_x86_get_idt)(vcpu, &dt);
- PUT_SMSTATE(u32, buf, 0x7e84, dt.size);
- PUT_SMSTATE(u64, buf, 0x7e88, dt.address);
-
- kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
- PUT_SMSTATE(u16, buf, 0x7e70, seg.selector);
- PUT_SMSTATE(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8);
- PUT_SMSTATE(u32, buf, 0x7e74, seg.limit);
- PUT_SMSTATE(u64, buf, 0x7e78, seg.base);
-
- static_call(kvm_x86_get_gdt)(vcpu, &dt);
- PUT_SMSTATE(u32, buf, 0x7e64, dt.size);
- PUT_SMSTATE(u64, buf, 0x7e68, dt.address);
-
- for (i = 0; i < 6; i++)
- enter_smm_save_seg_64(vcpu, buf, i);
-}
-#endif
-
-static void enter_smm(struct kvm_vcpu *vcpu)
-{
- struct kvm_segment cs, ds;
- struct desc_ptr dt;
- unsigned long cr0;
- char buf[512];
-
- memset(buf, 0, 512);
-#ifdef CONFIG_X86_64
- if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
- enter_smm_save_state_64(vcpu, buf);
- else
-#endif
- enter_smm_save_state_32(vcpu, buf);
-
- /*
- * Give enter_smm() a chance to make ISA-specific changes to the vCPU
- * state (e.g. leave guest mode) after we've saved the state into the
- * SMM state-save area.
- */
- static_call(kvm_x86_enter_smm)(vcpu, buf);
-
- kvm_smm_changed(vcpu, true);
- kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
-
- if (static_call(kvm_x86_get_nmi_mask)(vcpu))
- vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
- else
- static_call(kvm_x86_set_nmi_mask)(vcpu, true);
-
- kvm_set_rflags(vcpu, X86_EFLAGS_FIXED);
- kvm_rip_write(vcpu, 0x8000);
-
- cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG);
- static_call(kvm_x86_set_cr0)(vcpu, cr0);
- vcpu->arch.cr0 = cr0;
-
- static_call(kvm_x86_set_cr4)(vcpu, 0);
-
- /* Undocumented: IDT limit is set to zero on entry to SMM. */
- dt.address = dt.size = 0;
- static_call(kvm_x86_set_idt)(vcpu, &dt);
-
- kvm_set_dr(vcpu, 7, DR7_FIXED_1);
-
- cs.selector = (vcpu->arch.smbase >> 4) & 0xffff;
- cs.base = vcpu->arch.smbase;
-
- ds.selector = 0;
- ds.base = 0;
-
- cs.limit = ds.limit = 0xffffffff;
- cs.type = ds.type = 0x3;
- cs.dpl = ds.dpl = 0;
- cs.db = ds.db = 0;
- cs.s = ds.s = 1;
- cs.l = ds.l = 0;
- cs.g = ds.g = 1;
- cs.avl = ds.avl = 0;
- cs.present = ds.present = 1;
- cs.unusable = ds.unusable = 0;
- cs.padding = ds.padding = 0;
-
- kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
- kvm_set_segment(vcpu, &ds, VCPU_SREG_DS);
- kvm_set_segment(vcpu, &ds, VCPU_SREG_ES);
- kvm_set_segment(vcpu, &ds, VCPU_SREG_FS);
- kvm_set_segment(vcpu, &ds, VCPU_SREG_GS);
- kvm_set_segment(vcpu, &ds, VCPU_SREG_SS);
-
-#ifdef CONFIG_X86_64
- if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
- static_call(kvm_x86_set_efer)(vcpu, 0);
-#endif
-
- kvm_update_cpuid_runtime(vcpu);
- kvm_mmu_reset_context(vcpu);
-}
-
void kvm_make_scan_ioapic_request_mask(struct kvm *kvm,
unsigned long *vcpu_bitmap)
{
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 03/23] KVM: x86: move SMM exit to a new file
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 01/23] KVM: x86: start moving SMM-related functions to new files Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 02/23] KVM: x86: move SMM entry to a new file Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 04/23] KVM: x86: do not go through ctxt->ops when emulating rsm Maxim Levitsky
` (13 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
From: Paolo Bonzini <pbonzini@redhat.com>
Some users of KVM implement the UEFI variable store through a paravirtual
device that does not require the "SMM lockbox" component of edk2, and
would like to compile out system management mode. In preparation for
that, move the SMM exit code out of emulate.c and into a new file.
The code is still written as a series of invocations of the emulator
callbacks, but the two exiting_smm and leave_smm callbacks are merged
into one, and all the code from em_rsm is now part of the callback.
This removes all knowledge of the format of the SMM save state area
from the emulator. Further patches will clean up the code and
invoke KVM's own functions to access control registers, descriptor
caches, etc.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/emulate.c | 356 +------------------------------------
arch/x86/kvm/kvm_emulate.h | 34 +++-
arch/x86/kvm/smm.c | 316 ++++++++++++++++++++++++++++++++
arch/x86/kvm/smm.h | 1 +
arch/x86/kvm/x86.c | 14 --
5 files changed, 351 insertions(+), 370 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index de09660a61e522..671f7e5871ff70 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -30,7 +30,6 @@
#include "tss.h"
#include "mmu.h"
#include "pmu.h"
-#include "smm.h"
/*
* Operand types
@@ -243,37 +242,6 @@ enum x86_transfer_type {
X86_TRANSFER_TASK_SWITCH,
};
-static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr)
-{
- if (KVM_EMULATOR_BUG_ON(nr >= NR_EMULATOR_GPRS, ctxt))
- nr &= NR_EMULATOR_GPRS - 1;
-
- if (!(ctxt->regs_valid & (1 << nr))) {
- ctxt->regs_valid |= 1 << nr;
- ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr);
- }
- return ctxt->_regs[nr];
-}
-
-static ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr)
-{
- if (KVM_EMULATOR_BUG_ON(nr >= NR_EMULATOR_GPRS, ctxt))
- nr &= NR_EMULATOR_GPRS - 1;
-
- BUILD_BUG_ON(sizeof(ctxt->regs_dirty) * BITS_PER_BYTE < NR_EMULATOR_GPRS);
- BUILD_BUG_ON(sizeof(ctxt->regs_valid) * BITS_PER_BYTE < NR_EMULATOR_GPRS);
-
- ctxt->regs_valid |= 1 << nr;
- ctxt->regs_dirty |= 1 << nr;
- return &ctxt->_regs[nr];
-}
-
-static ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr)
-{
- reg_read(ctxt, nr);
- return reg_write(ctxt, nr);
-}
-
static void writeback_registers(struct x86_emulate_ctxt *ctxt)
{
unsigned long dirty = ctxt->regs_dirty;
@@ -2310,334 +2278,14 @@ static int em_lseg(struct x86_emulate_ctxt *ctxt)
return rc;
}
-static int emulator_has_longmode(struct x86_emulate_ctxt *ctxt)
-{
-#ifdef CONFIG_X86_64
- return ctxt->ops->guest_has_long_mode(ctxt);
-#else
- return false;
-#endif
-}
-
-static void rsm_set_desc_flags(struct desc_struct *desc, u32 flags)
-{
- desc->g = (flags >> 23) & 1;
- desc->d = (flags >> 22) & 1;
- desc->l = (flags >> 21) & 1;
- desc->avl = (flags >> 20) & 1;
- desc->p = (flags >> 15) & 1;
- desc->dpl = (flags >> 13) & 3;
- desc->s = (flags >> 12) & 1;
- desc->type = (flags >> 8) & 15;
-}
-
-static int rsm_load_seg_32(struct x86_emulate_ctxt *ctxt, const char *smstate,
- int n)
-{
- struct desc_struct desc;
- int offset;
- u16 selector;
-
- selector = GET_SMSTATE(u32, smstate, 0x7fa8 + n * 4);
-
- if (n < 3)
- offset = 0x7f84 + n * 12;
- else
- offset = 0x7f2c + (n - 3) * 12;
-
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, offset + 8));
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, offset + 4));
- rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, offset));
- ctxt->ops->set_segment(ctxt, selector, &desc, 0, n);
- return X86EMUL_CONTINUE;
-}
-
-#ifdef CONFIG_X86_64
-static int rsm_load_seg_64(struct x86_emulate_ctxt *ctxt, const char *smstate,
- int n)
-{
- struct desc_struct desc;
- int offset;
- u16 selector;
- u32 base3;
-
- offset = 0x7e00 + n * 16;
-
- selector = GET_SMSTATE(u16, smstate, offset);
- rsm_set_desc_flags(&desc, GET_SMSTATE(u16, smstate, offset + 2) << 8);
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, offset + 4));
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, offset + 8));
- base3 = GET_SMSTATE(u32, smstate, offset + 12);
-
- ctxt->ops->set_segment(ctxt, selector, &desc, base3, n);
- return X86EMUL_CONTINUE;
-}
-#endif
-
-static int rsm_enter_protected_mode(struct x86_emulate_ctxt *ctxt,
- u64 cr0, u64 cr3, u64 cr4)
-{
- int bad;
- u64 pcid;
-
- /* In order to later set CR4.PCIDE, CR3[11:0] must be zero. */
- pcid = 0;
- if (cr4 & X86_CR4_PCIDE) {
- pcid = cr3 & 0xfff;
- cr3 &= ~0xfff;
- }
-
- bad = ctxt->ops->set_cr(ctxt, 3, cr3);
- if (bad)
- return X86EMUL_UNHANDLEABLE;
-
- /*
- * First enable PAE, long mode needs it before CR0.PG = 1 is set.
- * Then enable protected mode. However, PCID cannot be enabled
- * if EFER.LMA=0, so set it separately.
- */
- bad = ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PCIDE);
- if (bad)
- return X86EMUL_UNHANDLEABLE;
-
- bad = ctxt->ops->set_cr(ctxt, 0, cr0);
- if (bad)
- return X86EMUL_UNHANDLEABLE;
-
- if (cr4 & X86_CR4_PCIDE) {
- bad = ctxt->ops->set_cr(ctxt, 4, cr4);
- if (bad)
- return X86EMUL_UNHANDLEABLE;
- if (pcid) {
- bad = ctxt->ops->set_cr(ctxt, 3, cr3 | pcid);
- if (bad)
- return X86EMUL_UNHANDLEABLE;
- }
-
- }
-
- return X86EMUL_CONTINUE;
-}
-
-static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt,
- const char *smstate)
-{
- struct desc_struct desc;
- struct desc_ptr dt;
- u16 selector;
- u32 val, cr0, cr3, cr4;
- int i;
-
- cr0 = GET_SMSTATE(u32, smstate, 0x7ffc);
- cr3 = GET_SMSTATE(u32, smstate, 0x7ff8);
- ctxt->eflags = GET_SMSTATE(u32, smstate, 0x7ff4) | X86_EFLAGS_FIXED;
- ctxt->_eip = GET_SMSTATE(u32, smstate, 0x7ff0);
-
- for (i = 0; i < NR_EMULATOR_GPRS; i++)
- *reg_write(ctxt, i) = GET_SMSTATE(u32, smstate, 0x7fd0 + i * 4);
-
- val = GET_SMSTATE(u32, smstate, 0x7fcc);
-
- if (ctxt->ops->set_dr(ctxt, 6, val))
- return X86EMUL_UNHANDLEABLE;
-
- val = GET_SMSTATE(u32, smstate, 0x7fc8);
-
- if (ctxt->ops->set_dr(ctxt, 7, val))
- return X86EMUL_UNHANDLEABLE;
-
- selector = GET_SMSTATE(u32, smstate, 0x7fc4);
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7f64));
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7f60));
- rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7f5c));
- ctxt->ops->set_segment(ctxt, selector, &desc, 0, VCPU_SREG_TR);
-
- selector = GET_SMSTATE(u32, smstate, 0x7fc0);
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7f80));
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7f7c));
- rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7f78));
- ctxt->ops->set_segment(ctxt, selector, &desc, 0, VCPU_SREG_LDTR);
-
- dt.address = GET_SMSTATE(u32, smstate, 0x7f74);
- dt.size = GET_SMSTATE(u32, smstate, 0x7f70);
- ctxt->ops->set_gdt(ctxt, &dt);
-
- dt.address = GET_SMSTATE(u32, smstate, 0x7f58);
- dt.size = GET_SMSTATE(u32, smstate, 0x7f54);
- ctxt->ops->set_idt(ctxt, &dt);
-
- for (i = 0; i < 6; i++) {
- int r = rsm_load_seg_32(ctxt, smstate, i);
- if (r != X86EMUL_CONTINUE)
- return r;
- }
-
- cr4 = GET_SMSTATE(u32, smstate, 0x7f14);
-
- ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smstate, 0x7ef8));
-
- return rsm_enter_protected_mode(ctxt, cr0, cr3, cr4);
-}
-
-#ifdef CONFIG_X86_64
-static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
- const char *smstate)
-{
- struct desc_struct desc;
- struct desc_ptr dt;
- u64 val, cr0, cr3, cr4;
- u32 base3;
- u16 selector;
- int i, r;
-
- for (i = 0; i < NR_EMULATOR_GPRS; i++)
- *reg_write(ctxt, i) = GET_SMSTATE(u64, smstate, 0x7ff8 - i * 8);
-
- ctxt->_eip = GET_SMSTATE(u64, smstate, 0x7f78);
- ctxt->eflags = GET_SMSTATE(u32, smstate, 0x7f70) | X86_EFLAGS_FIXED;
-
- val = GET_SMSTATE(u64, smstate, 0x7f68);
-
- if (ctxt->ops->set_dr(ctxt, 6, val))
- return X86EMUL_UNHANDLEABLE;
-
- val = GET_SMSTATE(u64, smstate, 0x7f60);
-
- if (ctxt->ops->set_dr(ctxt, 7, val))
- return X86EMUL_UNHANDLEABLE;
-
- cr0 = GET_SMSTATE(u64, smstate, 0x7f58);
- cr3 = GET_SMSTATE(u64, smstate, 0x7f50);
- cr4 = GET_SMSTATE(u64, smstate, 0x7f48);
- ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smstate, 0x7f00));
- val = GET_SMSTATE(u64, smstate, 0x7ed0);
-
- if (ctxt->ops->set_msr(ctxt, MSR_EFER, val & ~EFER_LMA))
- return X86EMUL_UNHANDLEABLE;
-
- selector = GET_SMSTATE(u32, smstate, 0x7e90);
- rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7e92) << 8);
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7e94));
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7e98));
- base3 = GET_SMSTATE(u32, smstate, 0x7e9c);
- ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_TR);
-
- dt.size = GET_SMSTATE(u32, smstate, 0x7e84);
- dt.address = GET_SMSTATE(u64, smstate, 0x7e88);
- ctxt->ops->set_idt(ctxt, &dt);
-
- selector = GET_SMSTATE(u32, smstate, 0x7e70);
- rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7e72) << 8);
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7e74));
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7e78));
- base3 = GET_SMSTATE(u32, smstate, 0x7e7c);
- ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_LDTR);
-
- dt.size = GET_SMSTATE(u32, smstate, 0x7e64);
- dt.address = GET_SMSTATE(u64, smstate, 0x7e68);
- ctxt->ops->set_gdt(ctxt, &dt);
-
- r = rsm_enter_protected_mode(ctxt, cr0, cr3, cr4);
- if (r != X86EMUL_CONTINUE)
- return r;
-
- for (i = 0; i < 6; i++) {
- r = rsm_load_seg_64(ctxt, smstate, i);
- if (r != X86EMUL_CONTINUE)
- return r;
- }
-
- return X86EMUL_CONTINUE;
-}
-#endif
-
static int em_rsm(struct x86_emulate_ctxt *ctxt)
{
- unsigned long cr0, cr4, efer;
- char buf[512];
- u64 smbase;
- int ret;
-
if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_MASK) == 0)
return emulate_ud(ctxt);
- smbase = ctxt->ops->get_smbase(ctxt);
-
- ret = ctxt->ops->read_phys(ctxt, smbase + 0xfe00, buf, sizeof(buf));
- if (ret != X86EMUL_CONTINUE)
- return X86EMUL_UNHANDLEABLE;
-
- if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_INSIDE_NMI_MASK) == 0)
- ctxt->ops->set_nmi_mask(ctxt, false);
-
- ctxt->ops->exiting_smm(ctxt);
-
- /*
- * Get back to real mode, to prepare a safe state in which to load
- * CR0/CR3/CR4/EFER. It's all a bit more complicated if the vCPU
- * supports long mode.
- */
- if (emulator_has_longmode(ctxt)) {
- struct desc_struct cs_desc;
-
- /* Zero CR4.PCIDE before CR0.PG. */
- cr4 = ctxt->ops->get_cr(ctxt, 4);
- if (cr4 & X86_CR4_PCIDE)
- ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PCIDE);
-
- /* A 32-bit code segment is required to clear EFER.LMA. */
- memset(&cs_desc, 0, sizeof(cs_desc));
- cs_desc.type = 0xb;
- cs_desc.s = cs_desc.g = cs_desc.p = 1;
- ctxt->ops->set_segment(ctxt, 0, &cs_desc, 0, VCPU_SREG_CS);
- }
-
- /* For the 64-bit case, this will clear EFER.LMA. */
- cr0 = ctxt->ops->get_cr(ctxt, 0);
- if (cr0 & X86_CR0_PE)
- ctxt->ops->set_cr(ctxt, 0, cr0 & ~(X86_CR0_PG | X86_CR0_PE));
-
- if (emulator_has_longmode(ctxt)) {
- /* Clear CR4.PAE before clearing EFER.LME. */
- cr4 = ctxt->ops->get_cr(ctxt, 4);
- if (cr4 & X86_CR4_PAE)
- ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PAE);
-
- /* And finally go back to 32-bit mode. */
- efer = 0;
- ctxt->ops->set_msr(ctxt, MSR_EFER, efer);
- }
-
- /*
- * Give leave_smm() a chance to make ISA-specific changes to the vCPU
- * state (e.g. enter guest mode) before loading state from the SMM
- * state-save area.
- */
- if (ctxt->ops->leave_smm(ctxt, buf))
- goto emulate_shutdown;
-
-#ifdef CONFIG_X86_64
- if (emulator_has_longmode(ctxt))
- ret = rsm_load_state_64(ctxt, buf);
- else
-#endif
- ret = rsm_load_state_32(ctxt, buf);
-
- if (ret != X86EMUL_CONTINUE)
- goto emulate_shutdown;
-
- /*
- * Note, the ctxt->ops callbacks are responsible for handling side
- * effects when writing MSRs and CRs, e.g. MMU context resets, CPUID
- * runtime updates, etc... If that changes, e.g. this flow is moved
- * out of the emulator to make it look more like enter_smm(), then
- * those side effects need to be explicitly handled for both success
- * and shutdown.
- */
- return X86EMUL_CONTINUE;
+ if (ctxt->ops->leave_smm(ctxt))
+ ctxt->ops->triple_fault(ctxt);
-emulate_shutdown:
- ctxt->ops->triple_fault(ctxt);
return X86EMUL_CONTINUE;
}
diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index 89246446d6aa9d..d7afbc448dd245 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -234,8 +234,7 @@ struct x86_emulate_ops {
void (*set_nmi_mask)(struct x86_emulate_ctxt *ctxt, bool masked);
unsigned (*get_hflags)(struct x86_emulate_ctxt *ctxt);
- void (*exiting_smm)(struct x86_emulate_ctxt *ctxt);
- int (*leave_smm)(struct x86_emulate_ctxt *ctxt, const char *smstate);
+ int (*leave_smm)(struct x86_emulate_ctxt *ctxt);
void (*triple_fault)(struct x86_emulate_ctxt *ctxt);
int (*set_xcr)(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr);
};
@@ -526,4 +525,35 @@ void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt);
void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt);
bool emulator_can_use_gpa(struct x86_emulate_ctxt *ctxt);
+static inline ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr)
+{
+ if (KVM_EMULATOR_BUG_ON(nr >= NR_EMULATOR_GPRS, ctxt))
+ nr &= NR_EMULATOR_GPRS - 1;
+
+ if (!(ctxt->regs_valid & (1 << nr))) {
+ ctxt->regs_valid |= 1 << nr;
+ ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr);
+ }
+ return ctxt->_regs[nr];
+}
+
+static inline ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr)
+{
+ if (KVM_EMULATOR_BUG_ON(nr >= NR_EMULATOR_GPRS, ctxt))
+ nr &= NR_EMULATOR_GPRS - 1;
+
+ BUILD_BUG_ON(sizeof(ctxt->regs_dirty) * BITS_PER_BYTE < NR_EMULATOR_GPRS);
+ BUILD_BUG_ON(sizeof(ctxt->regs_valid) * BITS_PER_BYTE < NR_EMULATOR_GPRS);
+
+ ctxt->regs_valid |= 1 << nr;
+ ctxt->regs_dirty |= 1 << nr;
+ return &ctxt->_regs[nr];
+}
+
+static inline ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr)
+{
+ reg_read(ctxt, nr);
+ return reg_write(ctxt, nr);
+}
+
#endif /* _ASM_X86_KVM_X86_EMULATE_H */
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index 26a6859e421fe1..773e07b6397df0 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -270,3 +270,319 @@ void enter_smm(struct kvm_vcpu *vcpu)
kvm_update_cpuid_runtime(vcpu);
kvm_mmu_reset_context(vcpu);
}
+
+static int emulator_has_longmode(struct x86_emulate_ctxt *ctxt)
+{
+#ifdef CONFIG_X86_64
+ return ctxt->ops->guest_has_long_mode(ctxt);
+#else
+ return false;
+#endif
+}
+
+static void rsm_set_desc_flags(struct desc_struct *desc, u32 flags)
+{
+ desc->g = (flags >> 23) & 1;
+ desc->d = (flags >> 22) & 1;
+ desc->l = (flags >> 21) & 1;
+ desc->avl = (flags >> 20) & 1;
+ desc->p = (flags >> 15) & 1;
+ desc->dpl = (flags >> 13) & 3;
+ desc->s = (flags >> 12) & 1;
+ desc->type = (flags >> 8) & 15;
+}
+
+static int rsm_load_seg_32(struct x86_emulate_ctxt *ctxt, const char *smstate,
+ int n)
+{
+ struct desc_struct desc;
+ int offset;
+ u16 selector;
+
+ selector = GET_SMSTATE(u32, smstate, 0x7fa8 + n * 4);
+
+ if (n < 3)
+ offset = 0x7f84 + n * 12;
+ else
+ offset = 0x7f2c + (n - 3) * 12;
+
+ set_desc_base(&desc, GET_SMSTATE(u32, smstate, offset + 8));
+ set_desc_limit(&desc, GET_SMSTATE(u32, smstate, offset + 4));
+ rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, offset));
+ ctxt->ops->set_segment(ctxt, selector, &desc, 0, n);
+ return X86EMUL_CONTINUE;
+}
+
+#ifdef CONFIG_X86_64
+static int rsm_load_seg_64(struct x86_emulate_ctxt *ctxt, const char *smstate,
+ int n)
+{
+ struct desc_struct desc;
+ int offset;
+ u16 selector;
+ u32 base3;
+
+ offset = 0x7e00 + n * 16;
+
+ selector = GET_SMSTATE(u16, smstate, offset);
+ rsm_set_desc_flags(&desc, GET_SMSTATE(u16, smstate, offset + 2) << 8);
+ set_desc_limit(&desc, GET_SMSTATE(u32, smstate, offset + 4));
+ set_desc_base(&desc, GET_SMSTATE(u32, smstate, offset + 8));
+ base3 = GET_SMSTATE(u32, smstate, offset + 12);
+
+ ctxt->ops->set_segment(ctxt, selector, &desc, base3, n);
+ return X86EMUL_CONTINUE;
+}
+#endif
+
+static int rsm_enter_protected_mode(struct x86_emulate_ctxt *ctxt,
+ u64 cr0, u64 cr3, u64 cr4)
+{
+ int bad;
+ u64 pcid;
+
+ /* In order to later set CR4.PCIDE, CR3[11:0] must be zero. */
+ pcid = 0;
+ if (cr4 & X86_CR4_PCIDE) {
+ pcid = cr3 & 0xfff;
+ cr3 &= ~0xfff;
+ }
+
+ bad = ctxt->ops->set_cr(ctxt, 3, cr3);
+ if (bad)
+ return X86EMUL_UNHANDLEABLE;
+
+ /*
+ * First enable PAE, long mode needs it before CR0.PG = 1 is set.
+ * Then enable protected mode. However, PCID cannot be enabled
+ * if EFER.LMA=0, so set it separately.
+ */
+ bad = ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PCIDE);
+ if (bad)
+ return X86EMUL_UNHANDLEABLE;
+
+ bad = ctxt->ops->set_cr(ctxt, 0, cr0);
+ if (bad)
+ return X86EMUL_UNHANDLEABLE;
+
+ if (cr4 & X86_CR4_PCIDE) {
+ bad = ctxt->ops->set_cr(ctxt, 4, cr4);
+ if (bad)
+ return X86EMUL_UNHANDLEABLE;
+ if (pcid) {
+ bad = ctxt->ops->set_cr(ctxt, 3, cr3 | pcid);
+ if (bad)
+ return X86EMUL_UNHANDLEABLE;
+ }
+
+ }
+
+ return X86EMUL_CONTINUE;
+}
+
+static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt,
+ const char *smstate)
+{
+ struct desc_struct desc;
+ struct desc_ptr dt;
+ u16 selector;
+ u32 val, cr0, cr3, cr4;
+ int i;
+
+ cr0 = GET_SMSTATE(u32, smstate, 0x7ffc);
+ cr3 = GET_SMSTATE(u32, smstate, 0x7ff8);
+ ctxt->eflags = GET_SMSTATE(u32, smstate, 0x7ff4) | X86_EFLAGS_FIXED;
+ ctxt->_eip = GET_SMSTATE(u32, smstate, 0x7ff0);
+
+ for (i = 0; i < NR_EMULATOR_GPRS; i++)
+ *reg_write(ctxt, i) = GET_SMSTATE(u32, smstate, 0x7fd0 + i * 4);
+
+ val = GET_SMSTATE(u32, smstate, 0x7fcc);
+
+ if (ctxt->ops->set_dr(ctxt, 6, val))
+ return X86EMUL_UNHANDLEABLE;
+
+ val = GET_SMSTATE(u32, smstate, 0x7fc8);
+
+ if (ctxt->ops->set_dr(ctxt, 7, val))
+ return X86EMUL_UNHANDLEABLE;
+
+ selector = GET_SMSTATE(u32, smstate, 0x7fc4);
+ set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7f64));
+ set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7f60));
+ rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7f5c));
+ ctxt->ops->set_segment(ctxt, selector, &desc, 0, VCPU_SREG_TR);
+
+ selector = GET_SMSTATE(u32, smstate, 0x7fc0);
+ set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7f80));
+ set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7f7c));
+ rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7f78));
+ ctxt->ops->set_segment(ctxt, selector, &desc, 0, VCPU_SREG_LDTR);
+
+ dt.address = GET_SMSTATE(u32, smstate, 0x7f74);
+ dt.size = GET_SMSTATE(u32, smstate, 0x7f70);
+ ctxt->ops->set_gdt(ctxt, &dt);
+
+ dt.address = GET_SMSTATE(u32, smstate, 0x7f58);
+ dt.size = GET_SMSTATE(u32, smstate, 0x7f54);
+ ctxt->ops->set_idt(ctxt, &dt);
+
+ for (i = 0; i < 6; i++) {
+ int r = rsm_load_seg_32(ctxt, smstate, i);
+ if (r != X86EMUL_CONTINUE)
+ return r;
+ }
+
+ cr4 = GET_SMSTATE(u32, smstate, 0x7f14);
+
+ ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smstate, 0x7ef8));
+
+ return rsm_enter_protected_mode(ctxt, cr0, cr3, cr4);
+}
+
+#ifdef CONFIG_X86_64
+static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
+ const char *smstate)
+{
+ struct desc_struct desc;
+ struct desc_ptr dt;
+ u64 val, cr0, cr3, cr4;
+ u32 base3;
+ u16 selector;
+ int i, r;
+
+ for (i = 0; i < NR_EMULATOR_GPRS; i++)
+ *reg_write(ctxt, i) = GET_SMSTATE(u64, smstate, 0x7ff8 - i * 8);
+
+ ctxt->_eip = GET_SMSTATE(u64, smstate, 0x7f78);
+ ctxt->eflags = GET_SMSTATE(u32, smstate, 0x7f70) | X86_EFLAGS_FIXED;
+
+ val = GET_SMSTATE(u64, smstate, 0x7f68);
+
+ if (ctxt->ops->set_dr(ctxt, 6, val))
+ return X86EMUL_UNHANDLEABLE;
+
+ val = GET_SMSTATE(u64, smstate, 0x7f60);
+
+ if (ctxt->ops->set_dr(ctxt, 7, val))
+ return X86EMUL_UNHANDLEABLE;
+
+ cr0 = GET_SMSTATE(u64, smstate, 0x7f58);
+ cr3 = GET_SMSTATE(u64, smstate, 0x7f50);
+ cr4 = GET_SMSTATE(u64, smstate, 0x7f48);
+ ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smstate, 0x7f00));
+ val = GET_SMSTATE(u64, smstate, 0x7ed0);
+
+ if (ctxt->ops->set_msr(ctxt, MSR_EFER, val & ~EFER_LMA))
+ return X86EMUL_UNHANDLEABLE;
+
+ selector = GET_SMSTATE(u32, smstate, 0x7e90);
+ rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7e92) << 8);
+ set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7e94));
+ set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7e98));
+ base3 = GET_SMSTATE(u32, smstate, 0x7e9c);
+ ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_TR);
+
+ dt.size = GET_SMSTATE(u32, smstate, 0x7e84);
+ dt.address = GET_SMSTATE(u64, smstate, 0x7e88);
+ ctxt->ops->set_idt(ctxt, &dt);
+
+ selector = GET_SMSTATE(u32, smstate, 0x7e70);
+ rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7e72) << 8);
+ set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7e74));
+ set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7e78));
+ base3 = GET_SMSTATE(u32, smstate, 0x7e7c);
+ ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_LDTR);
+
+ dt.size = GET_SMSTATE(u32, smstate, 0x7e64);
+ dt.address = GET_SMSTATE(u64, smstate, 0x7e68);
+ ctxt->ops->set_gdt(ctxt, &dt);
+
+ r = rsm_enter_protected_mode(ctxt, cr0, cr3, cr4);
+ if (r != X86EMUL_CONTINUE)
+ return r;
+
+ for (i = 0; i < 6; i++) {
+ r = rsm_load_seg_64(ctxt, smstate, i);
+ if (r != X86EMUL_CONTINUE)
+ return r;
+ }
+
+ return X86EMUL_CONTINUE;
+}
+#endif
+
+int emulator_leave_smm(struct x86_emulate_ctxt *ctxt)
+{
+ struct kvm_vcpu *vcpu = ctxt->vcpu;
+ unsigned long cr0, cr4, efer;
+ char buf[512];
+ u64 smbase;
+ int ret;
+
+ smbase = ctxt->ops->get_smbase(ctxt);
+
+ ret = ctxt->ops->read_phys(ctxt, smbase + 0xfe00, buf, sizeof(buf));
+ if (ret != X86EMUL_CONTINUE)
+ return X86EMUL_UNHANDLEABLE;
+
+ if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_INSIDE_NMI_MASK) == 0)
+ ctxt->ops->set_nmi_mask(ctxt, false);
+
+ kvm_smm_changed(vcpu, false);
+
+ /*
+ * Get back to real mode, to prepare a safe state in which to load
+ * CR0/CR3/CR4/EFER. It's all a bit more complicated if the vCPU
+ * supports long mode.
+ *
+ * The ctxt->ops callbacks will handle all side effects when writing
+ * writing MSRs and CRs, e.g. MMU context resets, CPUID
+ * runtime updates, etc.
+ */
+ if (emulator_has_longmode(ctxt)) {
+ struct desc_struct cs_desc;
+
+ /* Zero CR4.PCIDE before CR0.PG. */
+ cr4 = ctxt->ops->get_cr(ctxt, 4);
+ if (cr4 & X86_CR4_PCIDE)
+ ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PCIDE);
+
+ /* A 32-bit code segment is required to clear EFER.LMA. */
+ memset(&cs_desc, 0, sizeof(cs_desc));
+ cs_desc.type = 0xb;
+ cs_desc.s = cs_desc.g = cs_desc.p = 1;
+ ctxt->ops->set_segment(ctxt, 0, &cs_desc, 0, VCPU_SREG_CS);
+ }
+
+ /* For the 64-bit case, this will clear EFER.LMA. */
+ cr0 = ctxt->ops->get_cr(ctxt, 0);
+ if (cr0 & X86_CR0_PE)
+ ctxt->ops->set_cr(ctxt, 0, cr0 & ~(X86_CR0_PG | X86_CR0_PE));
+
+ if (emulator_has_longmode(ctxt)) {
+ /* Clear CR4.PAE before clearing EFER.LME. */
+ cr4 = ctxt->ops->get_cr(ctxt, 4);
+ if (cr4 & X86_CR4_PAE)
+ ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PAE);
+
+ /* And finally go back to 32-bit mode. */
+ efer = 0;
+ ctxt->ops->set_msr(ctxt, MSR_EFER, efer);
+ }
+
+ /*
+ * Give leave_smm() a chance to make ISA-specific changes to the vCPU
+ * state (e.g. enter guest mode) before loading state from the SMM
+ * state-save area.
+ */
+ if (static_call(kvm_x86_leave_smm)(vcpu, buf))
+ return X86EMUL_UNHANDLEABLE;
+
+#ifdef CONFIG_X86_64
+ if (emulator_has_longmode(ctxt))
+ return rsm_load_state_64(ctxt, buf);
+ else
+#endif
+ return rsm_load_state_32(ctxt, buf);
+}
diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h
index aacc6dac2c99a1..b0602a92e511e1 100644
--- a/arch/x86/kvm/smm.h
+++ b/arch/x86/kvm/smm.h
@@ -21,6 +21,7 @@ static inline bool is_smm(struct kvm_vcpu *vcpu)
void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm);
void enter_smm(struct kvm_vcpu *vcpu);
+int emulator_leave_smm(struct x86_emulate_ctxt *ctxt);
void process_smi(struct kvm_vcpu *vcpu);
#endif
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1f69f54d1dbc82..a1e524c2c39df2 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8108,19 +8108,6 @@ static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt)
return emul_to_vcpu(ctxt)->arch.hflags;
}
-static void emulator_exiting_smm(struct x86_emulate_ctxt *ctxt)
-{
- struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
-
- kvm_smm_changed(vcpu, false);
-}
-
-static int emulator_leave_smm(struct x86_emulate_ctxt *ctxt,
- const char *smstate)
-{
- return static_call(kvm_x86_leave_smm)(emul_to_vcpu(ctxt), smstate);
-}
-
static void emulator_triple_fault(struct x86_emulate_ctxt *ctxt)
{
kvm_make_request(KVM_REQ_TRIPLE_FAULT, emul_to_vcpu(ctxt));
@@ -8184,7 +8171,6 @@ static const struct x86_emulate_ops emulate_ops = {
.guest_has_rdpid = emulator_guest_has_rdpid,
.set_nmi_mask = emulator_set_nmi_mask,
.get_hflags = emulator_get_hflags,
- .exiting_smm = emulator_exiting_smm,
.leave_smm = emulator_leave_smm,
.triple_fault = emulator_triple_fault,
.set_xcr = emulator_set_xcr,
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 04/23] KVM: x86: do not go through ctxt->ops when emulating rsm
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (2 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 03/23] KVM: x86: move SMM exit " Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 05/23] KVM: allow compiling out SMM support Maxim Levitsky
` (12 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
From: Paolo Bonzini <pbonzini@redhat.com>
Now that RSM is implemented in a single emulator callback, there is no
point in going through other callbacks for the sake of modifying
processor state. Just invoke KVM's own internal functions directly,
and remove the callbacks that were only used by em_rsm; the only
substantial difference is in the handling of the segment registers
and descriptor cache, which have to be parsed into a struct kvm_segment
instead of a struct desc_struct.
This also fixes a bug where emulator_set_segment was shifting the
limit left by 12 if the G bit is set, but the limit had not been
shifted right upon entry to SMM.
The emulator context is still used to restore EIP and the general
purpose registers.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/kvm_emulate.h | 13 ---
arch/x86/kvm/smm.c | 177 +++++++++++++++++--------------------
arch/x86/kvm/x86.c | 33 -------
3 files changed, 81 insertions(+), 142 deletions(-)
diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index d7afbc448dd245..84b1f266146305 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -116,16 +116,6 @@ struct x86_emulate_ops {
unsigned int bytes,
struct x86_exception *fault, bool system);
- /*
- * read_phys: Read bytes of standard (non-emulated/special) memory.
- * Used for descriptor reading.
- * @addr: [IN ] Physical address from which to read.
- * @val: [OUT] Value read from memory.
- * @bytes: [IN ] Number of bytes to read from memory.
- */
- int (*read_phys)(struct x86_emulate_ctxt *ctxt, unsigned long addr,
- void *val, unsigned int bytes);
-
/*
* write_std: Write bytes of standard (non-emulated/special) memory.
* Used for descriptor writing.
@@ -209,11 +199,8 @@ struct x86_emulate_ops {
int (*cpl)(struct x86_emulate_ctxt *ctxt);
void (*get_dr)(struct x86_emulate_ctxt *ctxt, int dr, ulong *dest);
int (*set_dr)(struct x86_emulate_ctxt *ctxt, int dr, ulong value);
- u64 (*get_smbase)(struct x86_emulate_ctxt *ctxt);
- void (*set_smbase)(struct x86_emulate_ctxt *ctxt, u64 smbase);
int (*set_msr_with_filter)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 data);
int (*get_msr_with_filter)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 *pdata);
- int (*set_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 data);
int (*get_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 *pdata);
int (*check_pmc)(struct x86_emulate_ctxt *ctxt, u32 pmc);
int (*read_pmc)(struct x86_emulate_ctxt *ctxt, u32 pmc, u64 *pdata);
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index 773e07b6397df0..41ca128478fcd4 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -271,71 +271,59 @@ void enter_smm(struct kvm_vcpu *vcpu)
kvm_mmu_reset_context(vcpu);
}
-static int emulator_has_longmode(struct x86_emulate_ctxt *ctxt)
-{
-#ifdef CONFIG_X86_64
- return ctxt->ops->guest_has_long_mode(ctxt);
-#else
- return false;
-#endif
-}
-
-static void rsm_set_desc_flags(struct desc_struct *desc, u32 flags)
+static void rsm_set_desc_flags(struct kvm_segment *desc, u32 flags)
{
desc->g = (flags >> 23) & 1;
- desc->d = (flags >> 22) & 1;
+ desc->db = (flags >> 22) & 1;
desc->l = (flags >> 21) & 1;
desc->avl = (flags >> 20) & 1;
- desc->p = (flags >> 15) & 1;
+ desc->present = (flags >> 15) & 1;
desc->dpl = (flags >> 13) & 3;
desc->s = (flags >> 12) & 1;
desc->type = (flags >> 8) & 15;
+
+ desc->unusable = !desc->present;
+ desc->padding = 0;
}
-static int rsm_load_seg_32(struct x86_emulate_ctxt *ctxt, const char *smstate,
+static int rsm_load_seg_32(struct kvm_vcpu *vcpu, const char *smstate,
int n)
{
- struct desc_struct desc;
+ struct kvm_segment desc;
int offset;
- u16 selector;
-
- selector = GET_SMSTATE(u32, smstate, 0x7fa8 + n * 4);
if (n < 3)
offset = 0x7f84 + n * 12;
else
offset = 0x7f2c + (n - 3) * 12;
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, offset + 8));
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, offset + 4));
+ desc.selector = GET_SMSTATE(u32, smstate, 0x7fa8 + n * 4);
+ desc.base = GET_SMSTATE(u32, smstate, offset + 8);
+ desc.limit = GET_SMSTATE(u32, smstate, offset + 4);
rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, offset));
- ctxt->ops->set_segment(ctxt, selector, &desc, 0, n);
+ kvm_set_segment(vcpu, &desc, n);
return X86EMUL_CONTINUE;
}
#ifdef CONFIG_X86_64
-static int rsm_load_seg_64(struct x86_emulate_ctxt *ctxt, const char *smstate,
+static int rsm_load_seg_64(struct kvm_vcpu *vcpu, const char *smstate,
int n)
{
- struct desc_struct desc;
+ struct kvm_segment desc;
int offset;
- u16 selector;
- u32 base3;
offset = 0x7e00 + n * 16;
- selector = GET_SMSTATE(u16, smstate, offset);
+ desc.selector = GET_SMSTATE(u16, smstate, offset);
rsm_set_desc_flags(&desc, GET_SMSTATE(u16, smstate, offset + 2) << 8);
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, offset + 4));
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, offset + 8));
- base3 = GET_SMSTATE(u32, smstate, offset + 12);
-
- ctxt->ops->set_segment(ctxt, selector, &desc, base3, n);
+ desc.limit = GET_SMSTATE(u32, smstate, offset + 4);
+ desc.base = GET_SMSTATE(u64, smstate, offset + 8);
+ kvm_set_segment(vcpu, &desc, n);
return X86EMUL_CONTINUE;
}
#endif
-static int rsm_enter_protected_mode(struct x86_emulate_ctxt *ctxt,
+static int rsm_enter_protected_mode(struct kvm_vcpu *vcpu,
u64 cr0, u64 cr3, u64 cr4)
{
int bad;
@@ -348,7 +336,7 @@ static int rsm_enter_protected_mode(struct x86_emulate_ctxt *ctxt,
cr3 &= ~0xfff;
}
- bad = ctxt->ops->set_cr(ctxt, 3, cr3);
+ bad = kvm_set_cr3(vcpu, cr3);
if (bad)
return X86EMUL_UNHANDLEABLE;
@@ -357,20 +345,20 @@ static int rsm_enter_protected_mode(struct x86_emulate_ctxt *ctxt,
* Then enable protected mode. However, PCID cannot be enabled
* if EFER.LMA=0, so set it separately.
*/
- bad = ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PCIDE);
+ bad = kvm_set_cr4(vcpu, cr4 & ~X86_CR4_PCIDE);
if (bad)
return X86EMUL_UNHANDLEABLE;
- bad = ctxt->ops->set_cr(ctxt, 0, cr0);
+ bad = kvm_set_cr0(vcpu, cr0);
if (bad)
return X86EMUL_UNHANDLEABLE;
if (cr4 & X86_CR4_PCIDE) {
- bad = ctxt->ops->set_cr(ctxt, 4, cr4);
+ bad = kvm_set_cr4(vcpu, cr4);
if (bad)
return X86EMUL_UNHANDLEABLE;
if (pcid) {
- bad = ctxt->ops->set_cr(ctxt, 3, cr3 | pcid);
+ bad = kvm_set_cr3(vcpu, cr3 | pcid);
if (bad)
return X86EMUL_UNHANDLEABLE;
}
@@ -383,9 +371,9 @@ static int rsm_enter_protected_mode(struct x86_emulate_ctxt *ctxt,
static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt,
const char *smstate)
{
- struct desc_struct desc;
+ struct kvm_vcpu *vcpu = ctxt->vcpu;
+ struct kvm_segment desc;
struct desc_ptr dt;
- u16 selector;
u32 val, cr0, cr3, cr4;
int i;
@@ -399,56 +387,55 @@ static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt,
val = GET_SMSTATE(u32, smstate, 0x7fcc);
- if (ctxt->ops->set_dr(ctxt, 6, val))
+ if (kvm_set_dr(vcpu, 6, val))
return X86EMUL_UNHANDLEABLE;
val = GET_SMSTATE(u32, smstate, 0x7fc8);
- if (ctxt->ops->set_dr(ctxt, 7, val))
+ if (kvm_set_dr(vcpu, 7, val))
return X86EMUL_UNHANDLEABLE;
- selector = GET_SMSTATE(u32, smstate, 0x7fc4);
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7f64));
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7f60));
+ desc.selector = GET_SMSTATE(u32, smstate, 0x7fc4);
+ desc.base = GET_SMSTATE(u32, smstate, 0x7f64);
+ desc.limit = GET_SMSTATE(u32, smstate, 0x7f60);
rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7f5c));
- ctxt->ops->set_segment(ctxt, selector, &desc, 0, VCPU_SREG_TR);
+ kvm_set_segment(vcpu, &desc, VCPU_SREG_TR);
- selector = GET_SMSTATE(u32, smstate, 0x7fc0);
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7f80));
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7f7c));
+ desc.selector = GET_SMSTATE(u32, smstate, 0x7fc0);
+ desc.base = GET_SMSTATE(u32, smstate, 0x7f80);
+ desc.limit = GET_SMSTATE(u32, smstate, 0x7f7c);
rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7f78));
- ctxt->ops->set_segment(ctxt, selector, &desc, 0, VCPU_SREG_LDTR);
+ kvm_set_segment(vcpu, &desc, VCPU_SREG_LDTR);
dt.address = GET_SMSTATE(u32, smstate, 0x7f74);
dt.size = GET_SMSTATE(u32, smstate, 0x7f70);
- ctxt->ops->set_gdt(ctxt, &dt);
+ static_call(kvm_x86_set_gdt)(vcpu, &dt);
dt.address = GET_SMSTATE(u32, smstate, 0x7f58);
dt.size = GET_SMSTATE(u32, smstate, 0x7f54);
- ctxt->ops->set_idt(ctxt, &dt);
+ static_call(kvm_x86_set_idt)(vcpu, &dt);
for (i = 0; i < 6; i++) {
- int r = rsm_load_seg_32(ctxt, smstate, i);
+ int r = rsm_load_seg_32(vcpu, smstate, i);
if (r != X86EMUL_CONTINUE)
return r;
}
cr4 = GET_SMSTATE(u32, smstate, 0x7f14);
- ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smstate, 0x7ef8));
+ vcpu->arch.smbase = GET_SMSTATE(u32, smstate, 0x7ef8);
- return rsm_enter_protected_mode(ctxt, cr0, cr3, cr4);
+ return rsm_enter_protected_mode(vcpu, cr0, cr3, cr4);
}
#ifdef CONFIG_X86_64
static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
const char *smstate)
{
- struct desc_struct desc;
+ struct kvm_vcpu *vcpu = ctxt->vcpu;
+ struct kvm_segment desc;
struct desc_ptr dt;
u64 val, cr0, cr3, cr4;
- u32 base3;
- u16 selector;
int i, r;
for (i = 0; i < NR_EMULATOR_GPRS; i++)
@@ -459,51 +446,49 @@ static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
val = GET_SMSTATE(u64, smstate, 0x7f68);
- if (ctxt->ops->set_dr(ctxt, 6, val))
+ if (kvm_set_dr(vcpu, 6, val))
return X86EMUL_UNHANDLEABLE;
val = GET_SMSTATE(u64, smstate, 0x7f60);
- if (ctxt->ops->set_dr(ctxt, 7, val))
+ if (kvm_set_dr(vcpu, 7, val))
return X86EMUL_UNHANDLEABLE;
cr0 = GET_SMSTATE(u64, smstate, 0x7f58);
cr3 = GET_SMSTATE(u64, smstate, 0x7f50);
cr4 = GET_SMSTATE(u64, smstate, 0x7f48);
- ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smstate, 0x7f00));
+ vcpu->arch.smbase = GET_SMSTATE(u32, smstate, 0x7f00);
val = GET_SMSTATE(u64, smstate, 0x7ed0);
- if (ctxt->ops->set_msr(ctxt, MSR_EFER, val & ~EFER_LMA))
+ if (kvm_set_msr(vcpu, MSR_EFER, val & ~EFER_LMA))
return X86EMUL_UNHANDLEABLE;
- selector = GET_SMSTATE(u32, smstate, 0x7e90);
+ desc.selector = GET_SMSTATE(u32, smstate, 0x7e90);
rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7e92) << 8);
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7e94));
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7e98));
- base3 = GET_SMSTATE(u32, smstate, 0x7e9c);
- ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_TR);
+ desc.limit = GET_SMSTATE(u32, smstate, 0x7e94);
+ desc.base = GET_SMSTATE(u64, smstate, 0x7e98);
+ kvm_set_segment(vcpu, &desc, VCPU_SREG_TR);
dt.size = GET_SMSTATE(u32, smstate, 0x7e84);
dt.address = GET_SMSTATE(u64, smstate, 0x7e88);
- ctxt->ops->set_idt(ctxt, &dt);
+ static_call(kvm_x86_set_idt)(vcpu, &dt);
- selector = GET_SMSTATE(u32, smstate, 0x7e70);
+ desc.selector = GET_SMSTATE(u32, smstate, 0x7e70);
rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7e72) << 8);
- set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7e74));
- set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7e78));
- base3 = GET_SMSTATE(u32, smstate, 0x7e7c);
- ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_LDTR);
+ desc.limit = GET_SMSTATE(u32, smstate, 0x7e74);
+ desc.base = GET_SMSTATE(u64, smstate, 0x7e78);
+ kvm_set_segment(vcpu, &desc, VCPU_SREG_LDTR);
dt.size = GET_SMSTATE(u32, smstate, 0x7e64);
dt.address = GET_SMSTATE(u64, smstate, 0x7e68);
- ctxt->ops->set_gdt(ctxt, &dt);
+ static_call(kvm_x86_set_gdt)(vcpu, &dt);
- r = rsm_enter_protected_mode(ctxt, cr0, cr3, cr4);
+ r = rsm_enter_protected_mode(vcpu, cr0, cr3, cr4);
if (r != X86EMUL_CONTINUE)
return r;
for (i = 0; i < 6; i++) {
- r = rsm_load_seg_64(ctxt, smstate, i);
+ r = rsm_load_seg_64(vcpu, smstate, i);
if (r != X86EMUL_CONTINUE)
return r;
}
@@ -520,14 +505,14 @@ int emulator_leave_smm(struct x86_emulate_ctxt *ctxt)
u64 smbase;
int ret;
- smbase = ctxt->ops->get_smbase(ctxt);
+ smbase = vcpu->arch.smbase;
- ret = ctxt->ops->read_phys(ctxt, smbase + 0xfe00, buf, sizeof(buf));
- if (ret != X86EMUL_CONTINUE)
+ ret = kvm_vcpu_read_guest(vcpu, smbase + 0xfe00, buf, sizeof(buf));
+ if (ret < 0)
return X86EMUL_UNHANDLEABLE;
- if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_INSIDE_NMI_MASK) == 0)
- ctxt->ops->set_nmi_mask(ctxt, false);
+ if ((vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK) == 0)
+ static_call(kvm_x86_set_nmi_mask)(vcpu, false);
kvm_smm_changed(vcpu, false);
@@ -535,41 +520,41 @@ int emulator_leave_smm(struct x86_emulate_ctxt *ctxt)
* Get back to real mode, to prepare a safe state in which to load
* CR0/CR3/CR4/EFER. It's all a bit more complicated if the vCPU
* supports long mode.
- *
- * The ctxt->ops callbacks will handle all side effects when writing
- * writing MSRs and CRs, e.g. MMU context resets, CPUID
- * runtime updates, etc.
*/
- if (emulator_has_longmode(ctxt)) {
- struct desc_struct cs_desc;
+#ifdef CONFIG_X86_64
+ if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) {
+ struct kvm_segment cs_desc;
/* Zero CR4.PCIDE before CR0.PG. */
- cr4 = ctxt->ops->get_cr(ctxt, 4);
+ cr4 = kvm_read_cr4(vcpu);
if (cr4 & X86_CR4_PCIDE)
- ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PCIDE);
+ kvm_set_cr4(vcpu, cr4 & ~X86_CR4_PCIDE);
/* A 32-bit code segment is required to clear EFER.LMA. */
memset(&cs_desc, 0, sizeof(cs_desc));
cs_desc.type = 0xb;
- cs_desc.s = cs_desc.g = cs_desc.p = 1;
- ctxt->ops->set_segment(ctxt, 0, &cs_desc, 0, VCPU_SREG_CS);
+ cs_desc.s = cs_desc.g = cs_desc.present = 1;
+ kvm_set_segment(vcpu, &cs_desc, VCPU_SREG_CS);
}
+#endif
/* For the 64-bit case, this will clear EFER.LMA. */
- cr0 = ctxt->ops->get_cr(ctxt, 0);
+ cr0 = kvm_read_cr0(vcpu);
if (cr0 & X86_CR0_PE)
- ctxt->ops->set_cr(ctxt, 0, cr0 & ~(X86_CR0_PG | X86_CR0_PE));
+ kvm_set_cr0(vcpu, cr0 & ~(X86_CR0_PG | X86_CR0_PE));
- if (emulator_has_longmode(ctxt)) {
+#ifdef CONFIG_X86_64
+ if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) {
/* Clear CR4.PAE before clearing EFER.LME. */
- cr4 = ctxt->ops->get_cr(ctxt, 4);
+ cr4 = kvm_read_cr4(vcpu);
if (cr4 & X86_CR4_PAE)
- ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PAE);
+ kvm_set_cr4(vcpu, cr4 & ~X86_CR4_PAE);
/* And finally go back to 32-bit mode. */
efer = 0;
- ctxt->ops->set_msr(ctxt, MSR_EFER, efer);
+ kvm_set_msr(vcpu, MSR_EFER, efer);
}
+#endif
/*
* Give leave_smm() a chance to make ISA-specific changes to the vCPU
@@ -580,7 +565,7 @@ int emulator_leave_smm(struct x86_emulate_ctxt *ctxt)
return X86EMUL_UNHANDLEABLE;
#ifdef CONFIG_X86_64
- if (emulator_has_longmode(ctxt))
+ if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
return rsm_load_state_64(ctxt, buf);
else
#endif
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a1e524c2c39df2..2ae8ac525fc324 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7214,15 +7214,6 @@ static int emulator_read_std(struct x86_emulate_ctxt *ctxt,
return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, exception);
}
-static int kvm_read_guest_phys_system(struct x86_emulate_ctxt *ctxt,
- unsigned long addr, void *val, unsigned int bytes)
-{
- struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
- int r = kvm_vcpu_read_guest(vcpu, addr, val, bytes);
-
- return r < 0 ? X86EMUL_IO_NEEDED : X86EMUL_CONTINUE;
-}
-
static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
struct kvm_vcpu *vcpu, u64 access,
struct x86_exception *exception)
@@ -8014,26 +8005,6 @@ static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata);
}
-static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
- u32 msr_index, u64 data)
-{
- return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data);
-}
-
-static u64 emulator_get_smbase(struct x86_emulate_ctxt *ctxt)
-{
- struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
-
- return vcpu->arch.smbase;
-}
-
-static void emulator_set_smbase(struct x86_emulate_ctxt *ctxt, u64 smbase)
-{
- struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
-
- vcpu->arch.smbase = smbase;
-}
-
static int emulator_check_pmc(struct x86_emulate_ctxt *ctxt,
u32 pmc)
{
@@ -8132,7 +8103,6 @@ static const struct x86_emulate_ops emulate_ops = {
.write_gpr = emulator_write_gpr,
.read_std = emulator_read_std,
.write_std = emulator_write_std,
- .read_phys = kvm_read_guest_phys_system,
.fetch = kvm_fetch_guest_virt,
.read_emulated = emulator_read_emulated,
.write_emulated = emulator_write_emulated,
@@ -8152,11 +8122,8 @@ static const struct x86_emulate_ops emulate_ops = {
.cpl = emulator_get_cpl,
.get_dr = emulator_get_dr,
.set_dr = emulator_set_dr,
- .get_smbase = emulator_get_smbase,
- .set_smbase = emulator_set_smbase,
.set_msr_with_filter = emulator_set_msr_with_filter,
.get_msr_with_filter = emulator_get_msr_with_filter,
- .set_msr = emulator_set_msr,
.get_msr = emulator_get_msr,
.check_pmc = emulator_check_pmc,
.read_pmc = emulator_read_pmc,
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 05/23] KVM: allow compiling out SMM support
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (3 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 04/23] KVM: x86: do not go through ctxt->ops when emulating rsm Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 06/23] KVM: x86: compile out vendor-specific code if SMM is disabled Maxim Levitsky
` (11 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
From: Paolo Bonzini <pbonzini@redhat.com>
Some users of KVM implement the UEFI variable store through a paravirtual device
that does not require the "SMM lockbox" component of edk2; allow them to
compile out system management mode, which is not a full implementation
especially in how it interacts with nested virtualization.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/Kconfig | 11 ++++++++++
arch/x86/kvm/Makefile | 2 +-
arch/x86/kvm/smm.h | 13 ++++++++++++
arch/x86/kvm/svm/svm.c | 2 ++
arch/x86/kvm/vmx/vmx.c | 2 ++
arch/x86/kvm/x86.c | 21 +++++++++++++++++--
tools/testing/selftests/kvm/x86_64/smm_test.c | 2 ++
7 files changed, 50 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 67be7f217e37bd..716becc0df45b4 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -87,6 +87,17 @@ config KVM_INTEL
To compile this as a module, choose M here: the module
will be called kvm-intel.
+config KVM_SMM
+ bool "System Management Mode emulation"
+ default y
+ depends on KVM
+ help
+ Provides support for KVM to emulate System Management Mode (SMM)
+ in virtual machines. This can be used by the virtual machine
+ firmware to implement UEFI secure boot.
+
+ If unsure, say Y.
+
config X86_SGX_KVM
bool "Software Guard eXtensions (SGX) Virtualization"
depends on X86_SGX && KVM_INTEL
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index ec6f7656254b9f..6cf40f66827776 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -20,7 +20,7 @@ endif
kvm-$(CONFIG_X86_64) += mmu/tdp_iter.o mmu/tdp_mmu.o
kvm-$(CONFIG_KVM_XEN) += xen.o
-kvm-y += smm.o
+kvm-$(CONFIG_KVM_SMM) += smm.o
kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \
vmx/evmcs.o vmx/nested.o vmx/posted_intr.o
diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h
index b0602a92e511e1..4c699fee449296 100644
--- a/arch/x86/kvm/smm.h
+++ b/arch/x86/kvm/smm.h
@@ -8,6 +8,7 @@
#define PUT_SMSTATE(type, buf, offset, val) \
*(type *)((buf) + (offset) - 0x7e00) = val
+#ifdef CONFIG_KVM_SMM
static inline int kvm_inject_smi(struct kvm_vcpu *vcpu)
{
kvm_make_request(KVM_REQ_SMI, vcpu);
@@ -23,5 +24,17 @@ void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm);
void enter_smm(struct kvm_vcpu *vcpu);
int emulator_leave_smm(struct x86_emulate_ctxt *ctxt);
void process_smi(struct kvm_vcpu *vcpu);
+#else
+static inline int kvm_inject_smi(struct kvm_vcpu *vcpu) { return -ENOTTY; }
+static inline bool is_smm(struct kvm_vcpu *vcpu) { return false; }
+static inline void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm) { WARN_ON_ONCE(1); }
+static inline void enter_smm(struct kvm_vcpu *vcpu) { WARN_ON_ONCE(1); }
+static inline void process_smi(struct kvm_vcpu *vcpu) { WARN_ON_ONCE(1); }
+
+/*
+ * emulator_leave_smm is used as a function pointer, so the
+ * stub is defined in x86.c.
+ */
+#endif
#endif
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 496ee7d1ae2fb7..6f7ceb35d2ff08 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4150,6 +4150,8 @@ static bool svm_has_emulated_msr(struct kvm *kvm, u32 index)
case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
return false;
case MSR_IA32_SMBASE:
+ if (!IS_ENABLED(CONFIG_KVM_SMM))
+ return false;
/* SEV-ES guests do not support SMM, so report false */
if (kvm && sev_es_guest(kvm))
return false;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 038809c6800601..b22330a15adb63 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6841,6 +6841,8 @@ static bool vmx_has_emulated_msr(struct kvm *kvm, u32 index)
{
switch (index) {
case MSR_IA32_SMBASE:
+ if (!IS_ENABLED(CONFIG_KVM_SMM))
+ return false;
/*
* We cannot do SMM unless we can run the guest in big
* real mode.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2ae8ac525fc324..6c81d3a606e257 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3649,7 +3649,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
break;
}
case MSR_IA32_SMBASE:
- if (!msr_info->host_initiated)
+ if (!IS_ENABLED(CONFIG_KVM_SMM) || !msr_info->host_initiated)
return 1;
vcpu->arch.smbase = data;
break;
@@ -4065,7 +4065,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
msr_info->data = vcpu->arch.ia32_misc_enable_msr;
break;
case MSR_IA32_SMBASE:
- if (!msr_info->host_initiated)
+ if (!IS_ENABLED(CONFIG_KVM_SMM) || !msr_info->host_initiated)
return 1;
msr_info->data = vcpu->arch.smbase;
break;
@@ -4439,6 +4439,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r |= KVM_X86_DISABLE_EXITS_MWAIT;
break;
case KVM_CAP_X86_SMM:
+ if (!IS_ENABLED(CONFIG_KVM_SMM))
+ break;
+
/* SMBASE is usually relocated above 1M on modern chipsets,
* and SMM handlers might indeed rely on 4G segment limits,
* so do not report SMM to be available if real mode is
@@ -5189,6 +5192,12 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
vcpu->arch.apic->sipi_vector = events->sipi_vector;
if (events->flags & KVM_VCPUEVENT_VALID_SMM) {
+ if (!IS_ENABLED(CONFIG_KVM_SMM) &&
+ (events->smi.smm ||
+ events->smi.pending ||
+ events->smi.smm_inside_nmi))
+ return -EINVAL;
+
if (!!(vcpu->arch.hflags & HF_SMM_MASK) != events->smi.smm) {
kvm_x86_ops.nested_ops->leave_nested(vcpu);
kvm_smm_changed(vcpu, events->smi.smm);
@@ -8079,6 +8088,14 @@ static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt)
return emul_to_vcpu(ctxt)->arch.hflags;
}
+#ifndef CONFIG_KVM_SMM
+static int emulator_leave_smm(struct x86_emulate_ctxt *ctxt)
+{
+ WARN_ON_ONCE(1);
+ return X86EMUL_UNHANDLEABLE;
+}
+#endif
+
static void emulator_triple_fault(struct x86_emulate_ctxt *ctxt)
{
kvm_make_request(KVM_REQ_TRIPLE_FAULT, emul_to_vcpu(ctxt));
diff --git a/tools/testing/selftests/kvm/x86_64/smm_test.c b/tools/testing/selftests/kvm/x86_64/smm_test.c
index 1f136a81858e5d..cb38a478e1f62a 100644
--- a/tools/testing/selftests/kvm/x86_64/smm_test.c
+++ b/tools/testing/selftests/kvm/x86_64/smm_test.c
@@ -137,6 +137,8 @@ int main(int argc, char *argv[])
struct kvm_x86_state *state;
int stage, stage_reported;
+ TEST_REQUIRE(kvm_has_cap(KVM_CAP_X86_SMM));
+
/* Create VM */
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 06/23] KVM: x86: compile out vendor-specific code if SMM is disabled
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (4 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 05/23] KVM: allow compiling out SMM support Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 07/23] KVM: x86: remove SMRAM address space if SMM is not supported Maxim Levitsky
` (10 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
From: Paolo Bonzini <pbonzini@redhat.com>
Vendor-specific code that deals with SMI injection and saving/restoring
SMM state is not needed if CONFIG_KVM_SMM is disabled, so remove the
four callbacks smi_allowed, enter_smm, leave_smm and enable_smi_window.
The users in svm/nested.c and x86.c also have to be compiled out; the
amount of #ifdef'ed code is small and it's not worth moving it to
smm.c.
enter_smm is now used only within #ifdef CONFIG_KVM_SMM, and the stub
can therefore be removed.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/include/asm/kvm-x86-ops.h | 2 ++
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/smm.h | 1 -
arch/x86/kvm/svm/nested.c | 2 ++
arch/x86/kvm/svm/svm.c | 4 ++++
arch/x86/kvm/vmx/vmx.c | 4 ++++
arch/x86/kvm/x86.c | 4 ++++
7 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
index 82ba4a564e5875..ea58e67e9a6701 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -110,10 +110,12 @@ KVM_X86_OP_OPTIONAL_RET0(dy_apicv_has_pending_interrupt)
KVM_X86_OP_OPTIONAL(set_hv_timer)
KVM_X86_OP_OPTIONAL(cancel_hv_timer)
KVM_X86_OP(setup_mce)
+#ifdef CONFIG_KVM_SMM
KVM_X86_OP(smi_allowed)
KVM_X86_OP(enter_smm)
KVM_X86_OP(leave_smm)
KVM_X86_OP(enable_smi_window)
+#endif
KVM_X86_OP_OPTIONAL(mem_enc_ioctl)
KVM_X86_OP_OPTIONAL(mem_enc_register_region)
KVM_X86_OP_OPTIONAL(mem_enc_unregister_region)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4afed04fcc8241..541ed36cbb82f8 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1607,10 +1607,12 @@ struct kvm_x86_ops {
void (*setup_mce)(struct kvm_vcpu *vcpu);
+#ifdef CONFIG_KVM_SMM
int (*smi_allowed)(struct kvm_vcpu *vcpu, bool for_injection);
int (*enter_smm)(struct kvm_vcpu *vcpu, char *smstate);
int (*leave_smm)(struct kvm_vcpu *vcpu, const char *smstate);
void (*enable_smi_window)(struct kvm_vcpu *vcpu);
+#endif
int (*mem_enc_ioctl)(struct kvm *kvm, void __user *argp);
int (*mem_enc_register_region)(struct kvm *kvm, struct kvm_enc_region *argp);
diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h
index 4c699fee449296..7ccce6b655cacf 100644
--- a/arch/x86/kvm/smm.h
+++ b/arch/x86/kvm/smm.h
@@ -28,7 +28,6 @@ void process_smi(struct kvm_vcpu *vcpu);
static inline int kvm_inject_smi(struct kvm_vcpu *vcpu) { return -ENOTTY; }
static inline bool is_smm(struct kvm_vcpu *vcpu) { return false; }
static inline void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm) { WARN_ON_ONCE(1); }
-static inline void enter_smm(struct kvm_vcpu *vcpu) { WARN_ON_ONCE(1); }
static inline void process_smi(struct kvm_vcpu *vcpu) { WARN_ON_ONCE(1); }
/*
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index cc0fd75f7cbab5..b258d6988f5dde 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -1378,6 +1378,7 @@ static int svm_check_nested_events(struct kvm_vcpu *vcpu)
return 0;
}
+#ifdef CONFIG_KVM_SMM
if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) {
if (block_nested_events)
return -EBUSY;
@@ -1386,6 +1387,7 @@ static int svm_check_nested_events(struct kvm_vcpu *vcpu)
nested_svm_simple_vmexit(svm, SVM_EXIT_SMI);
return 0;
}
+#endif
if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) {
if (block_nested_events)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 6f7ceb35d2ff08..2200b8aa727398 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4408,6 +4408,7 @@ static void svm_setup_mce(struct kvm_vcpu *vcpu)
vcpu->arch.mcg_cap &= 0x1ff;
}
+#ifdef CONFIG_KVM_SMM
bool svm_smi_blocked(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
@@ -4557,6 +4558,7 @@ static void svm_enable_smi_window(struct kvm_vcpu *vcpu)
/* We must be in SMM; RSM will cause a vmexit anyway. */
}
}
+#endif
static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
void *insn, int insn_len)
@@ -4832,10 +4834,12 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.pi_update_irte = avic_pi_update_irte,
.setup_mce = svm_setup_mce,
+#ifdef CONFIG_KVM_SMM
.smi_allowed = svm_smi_allowed,
.enter_smm = svm_enter_smm,
.leave_smm = svm_leave_smm,
.enable_smi_window = svm_enable_smi_window,
+#endif
.mem_enc_ioctl = sev_mem_enc_ioctl,
.mem_enc_register_region = sev_mem_enc_register_region,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index b22330a15adb63..107fc035c91b80 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7905,6 +7905,7 @@ static void vmx_setup_mce(struct kvm_vcpu *vcpu)
~FEAT_CTL_LMCE_ENABLED;
}
+#ifdef CONFIG_KVM_SMM
static int vmx_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection)
{
/* we need a nested vmexit to enter SMM, postpone if run is pending */
@@ -7959,6 +7960,7 @@ static void vmx_enable_smi_window(struct kvm_vcpu *vcpu)
{
/* RSM will cause a vmexit anyway. */
}
+#endif
static bool vmx_apic_init_signal_blocked(struct kvm_vcpu *vcpu)
{
@@ -8126,10 +8128,12 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
.setup_mce = vmx_setup_mce,
+#ifdef CONFIG_KVM_SMM
.smi_allowed = vmx_smi_allowed,
.enter_smm = vmx_enter_smm,
.leave_smm = vmx_leave_smm,
.enable_smi_window = vmx_enable_smi_window,
+#endif
.can_emulate_instruction = vmx_can_emulate_instruction,
.apic_init_signal_blocked = vmx_apic_init_signal_blocked,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6c81d3a606e257..8394cd62c2854c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9876,6 +9876,7 @@ static int kvm_check_and_inject_events(struct kvm_vcpu *vcpu,
* in order to make progress and get back here for another iteration.
* The kvm_x86_ops hooks communicate this by returning -EBUSY.
*/
+#ifdef CONFIG_KVM_SMM
if (vcpu->arch.smi_pending) {
r = can_inject ? static_call(kvm_x86_smi_allowed)(vcpu, true) : -EBUSY;
if (r < 0)
@@ -9888,6 +9889,7 @@ static int kvm_check_and_inject_events(struct kvm_vcpu *vcpu,
} else
static_call(kvm_x86_enable_smi_window)(vcpu);
}
+#endif
if (vcpu->arch.nmi_pending) {
r = can_inject ? static_call(kvm_x86_nmi_allowed)(vcpu, true) : -EBUSY;
@@ -12517,10 +12519,12 @@ static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)
static_call(kvm_x86_nmi_allowed)(vcpu, false)))
return true;
+#ifdef CONFIG_KVM_SMM
if (kvm_test_request(KVM_REQ_SMI, vcpu) ||
(vcpu->arch.smi_pending &&
static_call(kvm_x86_smi_allowed)(vcpu, false)))
return true;
+#endif
if (kvm_arch_interrupt_allowed(vcpu) &&
(kvm_cpu_has_interrupt(vcpu) ||
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 07/23] KVM: x86: remove SMRAM address space if SMM is not supported
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (5 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 06/23] KVM: x86: compile out vendor-specific code if SMM is disabled Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 08/23] KVM: x86: do not define KVM_REQ_SMI if SMM disabled Maxim Levitsky
` (9 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
From: Paolo Bonzini <pbonzini@redhat.com>
If CONFIG_KVM_SMM is not defined HF_SMM_MASK will always be zero, and
we can spare userspace the hassle of setting up the SMRAM address space
simply by reporting that only one address space is supported.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/include/asm/kvm_host.h | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 541ed36cbb82f8..28e41926027e7a 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1995,11 +1995,14 @@ enum {
#define HF_SMM_MASK (1 << 6)
#define HF_SMM_INSIDE_NMI_MASK (1 << 7)
-#define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
-#define KVM_ADDRESS_SPACE_NUM 2
-
-#define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
-#define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)
+#ifdef CONFIG_KVM_SMM
+# define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
+# define KVM_ADDRESS_SPACE_NUM 2
+# define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
+# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)
+#else
+# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, 0)
+#endif
#define KVM_ARCH_WANT_MMU_NOTIFIER
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 08/23] KVM: x86: do not define KVM_REQ_SMI if SMM disabled
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (6 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 07/23] KVM: x86: remove SMRAM address space if SMM is not supported Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 09/23] bug: introduce ASSERT_STRUCT_OFFSET Maxim Levitsky
` (8 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
From: Paolo Bonzini <pbonzini@redhat.com>
This ensures that all the relevant code is compiled out, in fact
the process_smi stub can be removed too.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/smm.h | 1 -
arch/x86/kvm/x86.c | 6 ++++++
3 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 28e41926027e7a..0b0a82c0bb5cbd 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -81,7 +81,9 @@
#define KVM_REQ_NMI KVM_ARCH_REQ(9)
#define KVM_REQ_PMU KVM_ARCH_REQ(10)
#define KVM_REQ_PMI KVM_ARCH_REQ(11)
+#ifdef CONFIG_KVM_SMM
#define KVM_REQ_SMI KVM_ARCH_REQ(12)
+#endif
#define KVM_REQ_MASTERCLOCK_UPDATE KVM_ARCH_REQ(13)
#define KVM_REQ_MCLOCK_INPROGRESS \
KVM_ARCH_REQ_FLAGS(14, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h
index 7ccce6b655cacf..a6795b93ba3002 100644
--- a/arch/x86/kvm/smm.h
+++ b/arch/x86/kvm/smm.h
@@ -28,7 +28,6 @@ void process_smi(struct kvm_vcpu *vcpu);
static inline int kvm_inject_smi(struct kvm_vcpu *vcpu) { return -ENOTTY; }
static inline bool is_smm(struct kvm_vcpu *vcpu) { return false; }
static inline void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm) { WARN_ON_ONCE(1); }
-static inline void process_smi(struct kvm_vcpu *vcpu) { WARN_ON_ONCE(1); }
/*
* emulator_leave_smm is used as a function pointer, so the
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8394cd62c2854c..56004890a71742 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5033,8 +5033,10 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
process_nmi(vcpu);
+#ifdef CONFIG_KVM_SMM
if (kvm_check_request(KVM_REQ_SMI, vcpu))
process_smi(vcpu);
+#endif
/*
* KVM's ABI only allows for one exception to be migrated. Luckily,
@@ -10207,8 +10209,10 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
}
if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
record_steal_time(vcpu);
+#ifdef CONFIG_KVM_SMM
if (kvm_check_request(KVM_REQ_SMI, vcpu))
process_smi(vcpu);
+#endif
if (kvm_check_request(KVM_REQ_NMI, vcpu))
process_nmi(vcpu);
if (kvm_check_request(KVM_REQ_PMU, vcpu))
@@ -12565,7 +12569,9 @@ bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu)
return true;
if (kvm_test_request(KVM_REQ_NMI, vcpu) ||
+#ifdef CONFIG_KVM_SMM
kvm_test_request(KVM_REQ_SMI, vcpu) ||
+#endif
kvm_test_request(KVM_REQ_EVENT, vcpu))
return true;
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 09/23] bug: introduce ASSERT_STRUCT_OFFSET
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (7 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 08/23] KVM: x86: do not define KVM_REQ_SMI if SMM disabled Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 10/23] KVM: x86: emulator: em_sysexit should update ctxt->mode Maxim Levitsky
` (7 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
ASSERT_STRUCT_OFFSET allows to assert during the build of
the kernel that a field in a struct have an expected offset.
KVM used to have such macro, but there is almost nothing KVM specific
in it so move it to build_bug.h, so that it can be used in other
places in KVM.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/vmx/vmcs12.h | 5 ++---
include/linux/build_bug.h | 9 +++++++++
2 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmcs12.h b/arch/x86/kvm/vmx/vmcs12.h
index 746129ddd5ae02..01936013428b5c 100644
--- a/arch/x86/kvm/vmx/vmcs12.h
+++ b/arch/x86/kvm/vmx/vmcs12.h
@@ -208,9 +208,8 @@ struct __packed vmcs12 {
/*
* For save/restore compatibility, the vmcs12 field offsets must not change.
*/
-#define CHECK_OFFSET(field, loc) \
- BUILD_BUG_ON_MSG(offsetof(struct vmcs12, field) != (loc), \
- "Offset of " #field " in struct vmcs12 has changed.")
+#define CHECK_OFFSET(field, loc) \
+ ASSERT_STRUCT_OFFSET(struct vmcs12, field, loc)
static inline void vmx_check_vmcs12_offsets(void)
{
diff --git a/include/linux/build_bug.h b/include/linux/build_bug.h
index e3a0be2c90ad98..3aa3640f8c181f 100644
--- a/include/linux/build_bug.h
+++ b/include/linux/build_bug.h
@@ -77,4 +77,13 @@
#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
+
+/*
+ * Compile time check that field has an expected offset
+ */
+#define ASSERT_STRUCT_OFFSET(type, field, expected_offset) \
+ BUILD_BUG_ON_MSG(offsetof(type, field) != (expected_offset), \
+ "Offset of " #field " in " #type " has changed.")
+
+
#endif /* _LINUX_BUILD_BUG_H */
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 10/23] KVM: x86: emulator: em_sysexit should update ctxt->mode
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (8 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 09/23] bug: introduce ASSERT_STRUCT_OFFSET Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 11/23] KVM: x86: emulator: introduce emulator_recalc_and_set_mode Maxim Levitsky
` (6 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
SYSEXIT is one of the instructions that can change the
processor mode, thus ctxt->mode should be updated after it.
Note that this is likely a benign bug, because the only problematic
mode change is from 32 bit to 64 bit which can lead to truncation of RIP,
and it is not possible to do with sysexit,
since sysexit running in 32 bit mode will be limited to 32 bit version.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/emulate.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 671f7e5871ff70..e23c984d6aae09 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2525,6 +2525,7 @@ static int em_sysexit(struct x86_emulate_ctxt *ctxt)
ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
ctxt->_eip = rdx;
+ ctxt->mode = usermode;
*reg_write(ctxt, VCPU_REGS_RSP) = rcx;
return X86EMUL_CONTINUE;
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 11/23] KVM: x86: emulator: introduce emulator_recalc_and_set_mode
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (9 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 10/23] KVM: x86: emulator: em_sysexit should update ctxt->mode Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 12/23] KVM: x86: emulator: update the emulation mode after rsm Maxim Levitsky
` (5 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
Some instructions update the cpu execution mode, which needs to update the
emulation mode.
Extract this code, and make assign_eip_far use it.
assign_eip_far now reads CS, instead of getting it via a parameter,
which is ok, because callers always assign CS to the same value
before calling this function.
No functional change is intended.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/emulate.c | 85 ++++++++++++++++++++++++++++--------------
1 file changed, 57 insertions(+), 28 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index e23c984d6aae09..c65f57b6da9bf1 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -760,8 +760,7 @@ static int linearize(struct x86_emulate_ctxt *ctxt,
ctxt->mode, linear);
}
-static inline int assign_eip(struct x86_emulate_ctxt *ctxt, ulong dst,
- enum x86emul_mode mode)
+static inline int assign_eip(struct x86_emulate_ctxt *ctxt, ulong dst)
{
ulong linear;
int rc;
@@ -771,41 +770,71 @@ static inline int assign_eip(struct x86_emulate_ctxt *ctxt, ulong dst,
if (ctxt->op_bytes != sizeof(unsigned long))
addr.ea = dst & ((1UL << (ctxt->op_bytes << 3)) - 1);
- rc = __linearize(ctxt, addr, &max_size, 1, false, true, mode, &linear);
+ rc = __linearize(ctxt, addr, &max_size, 1, false, true, ctxt->mode, &linear);
if (rc == X86EMUL_CONTINUE)
ctxt->_eip = addr.ea;
return rc;
}
+static inline int emulator_recalc_and_set_mode(struct x86_emulate_ctxt *ctxt)
+{
+ u64 efer;
+ struct desc_struct cs;
+ u16 selector;
+ u32 base3;
+
+ ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
+
+ if (!(ctxt->ops->get_cr(ctxt, 0) & X86_CR0_PE)) {
+ /* Real mode. cpu must not have long mode active */
+ if (efer & EFER_LMA)
+ return X86EMUL_UNHANDLEABLE;
+ ctxt->mode = X86EMUL_MODE_REAL;
+ return X86EMUL_CONTINUE;
+ }
+
+ if (ctxt->eflags & X86_EFLAGS_VM) {
+ /* Protected/VM86 mode. cpu must not have long mode active */
+ if (efer & EFER_LMA)
+ return X86EMUL_UNHANDLEABLE;
+ ctxt->mode = X86EMUL_MODE_VM86;
+ return X86EMUL_CONTINUE;
+ }
+
+ if (!ctxt->ops->get_segment(ctxt, &selector, &cs, &base3, VCPU_SREG_CS))
+ return X86EMUL_UNHANDLEABLE;
+
+ if (efer & EFER_LMA) {
+ if (cs.l) {
+ /* Proper long mode */
+ ctxt->mode = X86EMUL_MODE_PROT64;
+ } else if (cs.d) {
+ /* 32 bit compatibility mode*/
+ ctxt->mode = X86EMUL_MODE_PROT32;
+ } else {
+ ctxt->mode = X86EMUL_MODE_PROT16;
+ }
+ } else {
+ /* Legacy 32 bit / 16 bit mode */
+ ctxt->mode = cs.d ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
+ }
+
+ return X86EMUL_CONTINUE;
+}
+
static inline int assign_eip_near(struct x86_emulate_ctxt *ctxt, ulong dst)
{
- return assign_eip(ctxt, dst, ctxt->mode);
+ return assign_eip(ctxt, dst);
}
-static int assign_eip_far(struct x86_emulate_ctxt *ctxt, ulong dst,
- const struct desc_struct *cs_desc)
+static int assign_eip_far(struct x86_emulate_ctxt *ctxt, ulong dst)
{
- enum x86emul_mode mode = ctxt->mode;
- int rc;
+ int rc = emulator_recalc_and_set_mode(ctxt);
-#ifdef CONFIG_X86_64
- if (ctxt->mode >= X86EMUL_MODE_PROT16) {
- if (cs_desc->l) {
- u64 efer = 0;
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
- ctxt->ops->get_msr(ctxt, MSR_EFER, &efer);
- if (efer & EFER_LMA)
- mode = X86EMUL_MODE_PROT64;
- } else
- mode = X86EMUL_MODE_PROT32; /* temporary value */
- }
-#endif
- if (mode == X86EMUL_MODE_PROT16 || mode == X86EMUL_MODE_PROT32)
- mode = cs_desc->d ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
- rc = assign_eip(ctxt, dst, mode);
- if (rc == X86EMUL_CONTINUE)
- ctxt->mode = mode;
- return rc;
+ return assign_eip(ctxt, dst);
}
static inline int jmp_rel(struct x86_emulate_ctxt *ctxt, int rel)
@@ -2141,7 +2170,7 @@ static int em_jmp_far(struct x86_emulate_ctxt *ctxt)
if (rc != X86EMUL_CONTINUE)
return rc;
- rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc);
+ rc = assign_eip_far(ctxt, ctxt->src.val);
/* Error handling is not implemented. */
if (rc != X86EMUL_CONTINUE)
return X86EMUL_UNHANDLEABLE;
@@ -2219,7 +2248,7 @@ static int em_ret_far(struct x86_emulate_ctxt *ctxt)
&new_desc);
if (rc != X86EMUL_CONTINUE)
return rc;
- rc = assign_eip_far(ctxt, eip, &new_desc);
+ rc = assign_eip_far(ctxt, eip);
/* Error handling is not implemented. */
if (rc != X86EMUL_CONTINUE)
return X86EMUL_UNHANDLEABLE;
@@ -3119,7 +3148,7 @@ static int em_call_far(struct x86_emulate_ctxt *ctxt)
if (rc != X86EMUL_CONTINUE)
return rc;
- rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc);
+ rc = assign_eip_far(ctxt, ctxt->src.val);
if (rc != X86EMUL_CONTINUE)
goto fail;
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 12/23] KVM: x86: emulator: update the emulation mode after rsm
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (10 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 11/23] KVM: x86: emulator: introduce emulator_recalc_and_set_mode Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 13/23] KVM: x86: emulator: update the emulation mode after CR0 write Maxim Levitsky
` (4 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
Update the emulation mode after RSM so that RIP will be correctly
written back, because the RSM instruction can switch the CPU mode from
32 bit (or less) to 64 bit.
This fixes a guest crash in case the #SMI is received while the guest
runs a code from an address > 32 bit.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/emulate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index c65f57b6da9bf1..2c56d08b426065 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2315,7 +2315,7 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt)
if (ctxt->ops->leave_smm(ctxt))
ctxt->ops->triple_fault(ctxt);
- return X86EMUL_CONTINUE;
+ return emulator_recalc_and_set_mode(ctxt);
}
static void
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 13/23] KVM: x86: emulator: update the emulation mode after CR0 write
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (11 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 12/23] KVM: x86: emulator: update the emulation mode after rsm Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 14/23] KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format Maxim Levitsky
` (3 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
Update the emulation mode when handling writes to CR0, because
toggling CR0.PE switches between Real and Protected Mode, and toggling
CR0.PG when EFER.LME=1 switches between Long and Protected Mode.
This is likely a benign bug because there is no writeback of state,
other than the RIP increment, and when toggling CR0.PE, the CPU has
to execute code from a very low memory address.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/emulate.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 2c56d08b426065..5cc3efa0e21c17 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3290,11 +3290,25 @@ static int em_movbe(struct x86_emulate_ctxt *ctxt)
static int em_cr_write(struct x86_emulate_ctxt *ctxt)
{
- if (ctxt->ops->set_cr(ctxt, ctxt->modrm_reg, ctxt->src.val))
+ int cr_num = ctxt->modrm_reg;
+ int r;
+
+ if (ctxt->ops->set_cr(ctxt, cr_num, ctxt->src.val))
return emulate_gp(ctxt, 0);
/* Disable writeback. */
ctxt->dst.type = OP_NONE;
+
+ if (cr_num == 0) {
+ /*
+ * CR0 write might have updated CR0.PE and/or CR0.PG
+ * which can affect the cpu's execution mode.
+ */
+ r = emulator_recalc_and_set_mode(ctxt);
+ if (r != X86EMUL_CONTINUE)
+ return r;
+ }
+
return X86EMUL_CONTINUE;
}
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 14/23] KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (12 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 13/23] KVM: x86: emulator: update the emulation mode after CR0 write Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 15/23] KVM: x86: smm: check for failures on smm entry Maxim Levitsky
` (2 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
On 64 bit host, if the guest doesn't have X86_FEATURE_LM, KVM will
access 16 gprs to 32-bit smram image, causing out-ouf-bound ram
access.
On 32 bit host, the rsm_load_state_64/enter_smm_save_state_64
is compiled out, thus access overflow can't happen.
Fixes: b443183a25ab61 ("KVM: x86: Reduce the number of emulator GPRs to '8' for 32-bit KVM")
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/emulate.c | 1 +
arch/x86/kvm/smm.c | 4 ++--
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 5cc3efa0e21c17..ac6fac25ba25d8 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2307,6 +2307,7 @@ static int em_lseg(struct x86_emulate_ctxt *ctxt)
return rc;
}
+
static int em_rsm(struct x86_emulate_ctxt *ctxt)
{
if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_MASK) == 0)
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index 41ca128478fcd4..b290ad14070f72 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -382,7 +382,7 @@ static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt,
ctxt->eflags = GET_SMSTATE(u32, smstate, 0x7ff4) | X86_EFLAGS_FIXED;
ctxt->_eip = GET_SMSTATE(u32, smstate, 0x7ff0);
- for (i = 0; i < NR_EMULATOR_GPRS; i++)
+ for (i = 0; i < 8; i++)
*reg_write(ctxt, i) = GET_SMSTATE(u32, smstate, 0x7fd0 + i * 4);
val = GET_SMSTATE(u32, smstate, 0x7fcc);
@@ -438,7 +438,7 @@ static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
u64 val, cr0, cr3, cr4;
int i, r;
- for (i = 0; i < NR_EMULATOR_GPRS; i++)
+ for (i = 0; i < 16; i++)
*reg_write(ctxt, i) = GET_SMSTATE(u64, smstate, 0x7ff8 - i * 8);
ctxt->_eip = GET_SMSTATE(u64, smstate, 0x7f78);
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 15/23] KVM: x86: smm: check for failures on smm entry
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (13 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 14/23] KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 16/23] KVM: x86: smm: add structs for KVM's smram layout Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 17/23] KVM: x86: smm: use smram structs in the common code Maxim Levitsky
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
In the rare case of the failure on SMM entry, the KVM should at
least terminate the VM instead of going south.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/smm.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index b290ad14070f72..1191a79cf027e5 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -211,11 +211,17 @@ void enter_smm(struct kvm_vcpu *vcpu)
* Give enter_smm() a chance to make ISA-specific changes to the vCPU
* state (e.g. leave guest mode) after we've saved the state into the
* SMM state-save area.
+ *
+ * Kill the VM in the unlikely case of failure, because the VM
+ * can be in undefined state in this case.
*/
- static_call(kvm_x86_enter_smm)(vcpu, buf);
+ if (static_call(kvm_x86_enter_smm)(vcpu, buf))
+ goto error;
kvm_smm_changed(vcpu, true);
- kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
+
+ if (kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf)))
+ goto error;
if (static_call(kvm_x86_get_nmi_mask)(vcpu))
vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
@@ -235,7 +241,8 @@ void enter_smm(struct kvm_vcpu *vcpu)
dt.address = dt.size = 0;
static_call(kvm_x86_set_idt)(vcpu, &dt);
- kvm_set_dr(vcpu, 7, DR7_FIXED_1);
+ if (WARN_ON_ONCE(kvm_set_dr(vcpu, 7, DR7_FIXED_1)))
+ goto error;
cs.selector = (vcpu->arch.smbase >> 4) & 0xffff;
cs.base = vcpu->arch.smbase;
@@ -264,11 +271,15 @@ void enter_smm(struct kvm_vcpu *vcpu)
#ifdef CONFIG_X86_64
if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
- static_call(kvm_x86_set_efer)(vcpu, 0);
+ if (static_call(kvm_x86_set_efer)(vcpu, 0))
+ goto error;
#endif
kvm_update_cpuid_runtime(vcpu);
kvm_mmu_reset_context(vcpu);
+ return;
+error:
+ kvm_vm_dead(vcpu->kvm);
}
static void rsm_set_desc_flags(struct kvm_segment *desc, u32 flags)
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 16/23] KVM: x86: smm: add structs for KVM's smram layout
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (14 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 15/23] KVM: x86: smm: check for failures on smm entry Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 17/23] KVM: x86: smm: use smram structs in the common code Maxim Levitsky
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
Add structs that will be used to define and read/write the KVM's
SMRAM layout, instead of reading/writing to raw offsets.
Also document the differences between KVM's SMRAM layout and SMRAM
layout that is used by real Intel/AMD cpus.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/smm.c | 94 +++++++++++++++++++++++++++++++++
arch/x86/kvm/smm.h | 127 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 221 insertions(+)
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index 1191a79cf027e5..01dab9fc3ab4b7 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -8,6 +8,97 @@
#include "cpuid.h"
#include "trace.h"
+#define CHECK_SMRAM32_OFFSET(field, offset) \
+ ASSERT_STRUCT_OFFSET(struct kvm_smram_state_32, field, offset - 0xFE00)
+
+#define CHECK_SMRAM64_OFFSET(field, offset) \
+ ASSERT_STRUCT_OFFSET(struct kvm_smram_state_64, field, offset - 0xFE00)
+
+static void check_smram_offsets(void)
+{
+ /* 32 bit SMRAM image */
+ CHECK_SMRAM32_OFFSET(reserved1, 0xFE00);
+ CHECK_SMRAM32_OFFSET(smbase, 0xFEF8);
+ CHECK_SMRAM32_OFFSET(smm_revision, 0xFEFC);
+ CHECK_SMRAM32_OFFSET(reserved2, 0xFF00);
+ CHECK_SMRAM32_OFFSET(cr4, 0xFF14);
+ CHECK_SMRAM32_OFFSET(reserved3, 0xFF18);
+ CHECK_SMRAM32_OFFSET(ds, 0xFF2C);
+ CHECK_SMRAM32_OFFSET(fs, 0xFF38);
+ CHECK_SMRAM32_OFFSET(gs, 0xFF44);
+ CHECK_SMRAM32_OFFSET(idtr, 0xFF50);
+ CHECK_SMRAM32_OFFSET(tr, 0xFF5C);
+ CHECK_SMRAM32_OFFSET(gdtr, 0xFF6C);
+ CHECK_SMRAM32_OFFSET(ldtr, 0xFF78);
+ CHECK_SMRAM32_OFFSET(es, 0xFF84);
+ CHECK_SMRAM32_OFFSET(cs, 0xFF90);
+ CHECK_SMRAM32_OFFSET(ss, 0xFF9C);
+ CHECK_SMRAM32_OFFSET(es_sel, 0xFFA8);
+ CHECK_SMRAM32_OFFSET(cs_sel, 0xFFAC);
+ CHECK_SMRAM32_OFFSET(ss_sel, 0xFFB0);
+ CHECK_SMRAM32_OFFSET(ds_sel, 0xFFB4);
+ CHECK_SMRAM32_OFFSET(fs_sel, 0xFFB8);
+ CHECK_SMRAM32_OFFSET(gs_sel, 0xFFBC);
+ CHECK_SMRAM32_OFFSET(ldtr_sel, 0xFFC0);
+ CHECK_SMRAM32_OFFSET(tr_sel, 0xFFC4);
+ CHECK_SMRAM32_OFFSET(dr7, 0xFFC8);
+ CHECK_SMRAM32_OFFSET(dr6, 0xFFCC);
+ CHECK_SMRAM32_OFFSET(gprs, 0xFFD0);
+ CHECK_SMRAM32_OFFSET(eip, 0xFFF0);
+ CHECK_SMRAM32_OFFSET(eflags, 0xFFF4);
+ CHECK_SMRAM32_OFFSET(cr3, 0xFFF8);
+ CHECK_SMRAM32_OFFSET(cr0, 0xFFFC);
+
+ /* 64 bit SMRAM image */
+ CHECK_SMRAM64_OFFSET(es, 0xFE00);
+ CHECK_SMRAM64_OFFSET(cs, 0xFE10);
+ CHECK_SMRAM64_OFFSET(ss, 0xFE20);
+ CHECK_SMRAM64_OFFSET(ds, 0xFE30);
+ CHECK_SMRAM64_OFFSET(fs, 0xFE40);
+ CHECK_SMRAM64_OFFSET(gs, 0xFE50);
+ CHECK_SMRAM64_OFFSET(gdtr, 0xFE60);
+ CHECK_SMRAM64_OFFSET(ldtr, 0xFE70);
+ CHECK_SMRAM64_OFFSET(idtr, 0xFE80);
+ CHECK_SMRAM64_OFFSET(tr, 0xFE90);
+ CHECK_SMRAM64_OFFSET(io_restart_rip, 0xFEA0);
+ CHECK_SMRAM64_OFFSET(io_restart_rcx, 0xFEA8);
+ CHECK_SMRAM64_OFFSET(io_restart_rsi, 0xFEB0);
+ CHECK_SMRAM64_OFFSET(io_restart_rdi, 0xFEB8);
+ CHECK_SMRAM64_OFFSET(io_restart_dword, 0xFEC0);
+ CHECK_SMRAM64_OFFSET(reserved1, 0xFEC4);
+ CHECK_SMRAM64_OFFSET(io_inst_restart, 0xFEC8);
+ CHECK_SMRAM64_OFFSET(auto_hlt_restart, 0xFEC9);
+ CHECK_SMRAM64_OFFSET(reserved2, 0xFECA);
+ CHECK_SMRAM64_OFFSET(efer, 0xFED0);
+ CHECK_SMRAM64_OFFSET(svm_guest_flag, 0xFED8);
+ CHECK_SMRAM64_OFFSET(svm_guest_vmcb_gpa, 0xFEE0);
+ CHECK_SMRAM64_OFFSET(svm_guest_virtual_int, 0xFEE8);
+ CHECK_SMRAM64_OFFSET(reserved3, 0xFEF0);
+ CHECK_SMRAM64_OFFSET(smm_revison, 0xFEFC);
+ CHECK_SMRAM64_OFFSET(smbase, 0xFF00);
+ CHECK_SMRAM64_OFFSET(reserved4, 0xFF04);
+ CHECK_SMRAM64_OFFSET(ssp, 0xFF18);
+ CHECK_SMRAM64_OFFSET(svm_guest_pat, 0xFF20);
+ CHECK_SMRAM64_OFFSET(svm_host_efer, 0xFF28);
+ CHECK_SMRAM64_OFFSET(svm_host_cr4, 0xFF30);
+ CHECK_SMRAM64_OFFSET(svm_host_cr3, 0xFF38);
+ CHECK_SMRAM64_OFFSET(svm_host_cr0, 0xFF40);
+ CHECK_SMRAM64_OFFSET(cr4, 0xFF48);
+ CHECK_SMRAM64_OFFSET(cr3, 0xFF50);
+ CHECK_SMRAM64_OFFSET(cr0, 0xFF58);
+ CHECK_SMRAM64_OFFSET(dr7, 0xFF60);
+ CHECK_SMRAM64_OFFSET(dr6, 0xFF68);
+ CHECK_SMRAM64_OFFSET(rflags, 0xFF70);
+ CHECK_SMRAM64_OFFSET(rip, 0xFF78);
+ CHECK_SMRAM64_OFFSET(gprs, 0xFF80);
+
+ BUILD_BUG_ON(sizeof(union kvm_smram) != 512);
+}
+
+#undef CHECK_SMRAM64_OFFSET
+#undef CHECK_SMRAM32_OFFSET
+
+
void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm)
{
trace_kvm_smm_transition(vcpu->vcpu_id, vcpu->arch.smbase, entering_smm);
@@ -199,6 +290,8 @@ void enter_smm(struct kvm_vcpu *vcpu)
unsigned long cr0;
char buf[512];
+ check_smram_offsets();
+
memset(buf, 0, 512);
#ifdef CONFIG_X86_64
if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
@@ -449,6 +542,7 @@ static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
u64 val, cr0, cr3, cr4;
int i, r;
+
for (i = 0; i < 16; i++)
*reg_write(ctxt, i) = GET_SMSTATE(u64, smstate, 0x7ff8 - i * 8);
diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h
index a6795b93ba3002..bf5c7ffeb11efc 100644
--- a/arch/x86/kvm/smm.h
+++ b/arch/x86/kvm/smm.h
@@ -2,6 +2,8 @@
#ifndef ASM_KVM_SMM_H
#define ASM_KVM_SMM_H
+#include <linux/build_bug.h>
+
#define GET_SMSTATE(type, buf, offset) \
(*(type *)((buf) + (offset) - 0x7e00))
@@ -9,6 +11,131 @@
*(type *)((buf) + (offset) - 0x7e00) = val
#ifdef CONFIG_KVM_SMM
+
+
+/* 32 bit KVM's emulated SMM layout. Loosely based on Intel's layout */
+
+struct kvm_smm_seg_state_32 {
+ u32 flags;
+ u32 limit;
+ u32 base;
+} __packed;
+
+struct kvm_smram_state_32 {
+ u32 reserved1[62];
+ u32 smbase;
+ u32 smm_revision;
+ u32 reserved2[5];
+ u32 cr4; /* CR4 is not present in Intel/AMD SMRAM image */
+ u32 reserved3[5];
+
+ /*
+ * Segment state is not present/documented in the Intel/AMD SMRAM image
+ * Instead this area on Intel/AMD contains IO/HLT restart flags.
+ */
+ struct kvm_smm_seg_state_32 ds;
+ struct kvm_smm_seg_state_32 fs;
+ struct kvm_smm_seg_state_32 gs;
+ struct kvm_smm_seg_state_32 idtr; /* IDTR has only base and limit */
+ struct kvm_smm_seg_state_32 tr;
+ u32 reserved;
+ struct kvm_smm_seg_state_32 gdtr; /* GDTR has only base and limit */
+ struct kvm_smm_seg_state_32 ldtr;
+ struct kvm_smm_seg_state_32 es;
+ struct kvm_smm_seg_state_32 cs;
+ struct kvm_smm_seg_state_32 ss;
+
+ u32 es_sel;
+ u32 cs_sel;
+ u32 ss_sel;
+ u32 ds_sel;
+ u32 fs_sel;
+ u32 gs_sel;
+ u32 ldtr_sel;
+ u32 tr_sel;
+
+ u32 dr7;
+ u32 dr6;
+ u32 gprs[8]; /* GPRS in the "natural" X86 order (EAX/ECX/EDX.../EDI) */
+ u32 eip;
+ u32 eflags;
+ u32 cr3;
+ u32 cr0;
+} __packed;
+
+
+/* 64 bit KVM's emulated SMM layout. Based on AMD64 layout */
+
+struct kvm_smm_seg_state_64 {
+ u16 selector;
+ u16 attributes;
+ u32 limit;
+ u64 base;
+};
+
+struct kvm_smram_state_64 {
+
+ struct kvm_smm_seg_state_64 es;
+ struct kvm_smm_seg_state_64 cs;
+ struct kvm_smm_seg_state_64 ss;
+ struct kvm_smm_seg_state_64 ds;
+ struct kvm_smm_seg_state_64 fs;
+ struct kvm_smm_seg_state_64 gs;
+ struct kvm_smm_seg_state_64 gdtr; /* GDTR has only base and limit*/
+ struct kvm_smm_seg_state_64 ldtr;
+ struct kvm_smm_seg_state_64 idtr; /* IDTR has only base and limit*/
+ struct kvm_smm_seg_state_64 tr;
+
+ /* I/O restart and auto halt restart are not implemented by KVM */
+ u64 io_restart_rip;
+ u64 io_restart_rcx;
+ u64 io_restart_rsi;
+ u64 io_restart_rdi;
+ u32 io_restart_dword;
+ u32 reserved1;
+ u8 io_inst_restart;
+ u8 auto_hlt_restart;
+ u8 reserved2[6];
+
+ u64 efer;
+
+ /*
+ * Two fields below are implemented on AMD only, to store
+ * SVM guest vmcb address if the #SMI was received while in the guest mode.
+ */
+ u64 svm_guest_flag;
+ u64 svm_guest_vmcb_gpa;
+ u64 svm_guest_virtual_int; /* unknown purpose, not implemented */
+
+ u32 reserved3[3];
+ u32 smm_revison;
+ u32 smbase;
+ u32 reserved4[5];
+
+ /* ssp and svm_* fields below are not implemented by KVM */
+ u64 ssp;
+ u64 svm_guest_pat;
+ u64 svm_host_efer;
+ u64 svm_host_cr4;
+ u64 svm_host_cr3;
+ u64 svm_host_cr0;
+
+ u64 cr4;
+ u64 cr3;
+ u64 cr0;
+ u64 dr7;
+ u64 dr6;
+ u64 rflags;
+ u64 rip;
+ u64 gprs[16]; /* GPRS in a reversed "natural" X86 order (R15/R14/../RCX/RAX.) */
+};
+
+union kvm_smram {
+ struct kvm_smram_state_64 smram64;
+ struct kvm_smram_state_32 smram32;
+ u8 bytes[512];
+};
+
static inline int kvm_inject_smi(struct kvm_vcpu *vcpu)
{
kvm_make_request(KVM_REQ_SMI, vcpu);
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 17/23] KVM: x86: smm: use smram structs in the common code
2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
` (15 preceding siblings ...)
2022-10-25 12:42 ` [PATCH v4 16/23] KVM: x86: smm: add structs for KVM's smram layout Maxim Levitsky
@ 2022-10-25 12:42 ` Maxim Levitsky
16 siblings, 0 replies; 18+ messages in thread
From: Maxim Levitsky @ 2022-10-25 12:42 UTC (permalink / raw)
To: kvm
Cc: Paolo Bonzini, Yang Zhong, linux-kselftest, Kees Cook,
Borislav Petkov, Guang Zeng, Wanpeng Li, Thomas Gleixner,
Ingo Molnar, H. Peter Anvin, Maxim Levitsky, Joerg Roedel,
linux-kernel, Wei Wang, Jim Mattson, Dave Hansen,
Sean Christopherson, Vitaly Kuznetsov, x86, Shuah Khan
Use kvm_smram union instad of raw arrays in the common smm code.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/include/asm/kvm_host.h | 5 +++--
arch/x86/kvm/smm.c | 27 ++++++++++++++-------------
arch/x86/kvm/svm/svm.c | 8 ++++++--
arch/x86/kvm/vmx/vmx.c | 4 ++--
4 files changed, 25 insertions(+), 19 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 0b0a82c0bb5cbd..540ff3122bbf8e 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -206,6 +206,7 @@ typedef enum exit_fastpath_completion fastpath_t;
struct x86_emulate_ctxt;
struct x86_exception;
+union kvm_smram;
enum x86_intercept;
enum x86_intercept_stage;
@@ -1611,8 +1612,8 @@ struct kvm_x86_ops {
#ifdef CONFIG_KVM_SMM
int (*smi_allowed)(struct kvm_vcpu *vcpu, bool for_injection);
- int (*enter_smm)(struct kvm_vcpu *vcpu, char *smstate);
- int (*leave_smm)(struct kvm_vcpu *vcpu, const char *smstate);
+ int (*enter_smm)(struct kvm_vcpu *vcpu, union kvm_smram *smram);
+ int (*leave_smm)(struct kvm_vcpu *vcpu, const union kvm_smram *smram);
void (*enable_smi_window)(struct kvm_vcpu *vcpu);
#endif
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index 01dab9fc3ab4b7..e714d43b746cce 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -288,17 +288,18 @@ void enter_smm(struct kvm_vcpu *vcpu)
struct kvm_segment cs, ds;
struct desc_ptr dt;
unsigned long cr0;
- char buf[512];
+ union kvm_smram smram;
check_smram_offsets();
- memset(buf, 0, 512);
+ memset(smram.bytes, 0, sizeof(smram.bytes));
+
#ifdef CONFIG_X86_64
if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
- enter_smm_save_state_64(vcpu, buf);
+ enter_smm_save_state_64(vcpu, smram.bytes);
else
#endif
- enter_smm_save_state_32(vcpu, buf);
+ enter_smm_save_state_32(vcpu, smram.bytes);
/*
* Give enter_smm() a chance to make ISA-specific changes to the vCPU
@@ -308,12 +309,12 @@ void enter_smm(struct kvm_vcpu *vcpu)
* Kill the VM in the unlikely case of failure, because the VM
* can be in undefined state in this case.
*/
- if (static_call(kvm_x86_enter_smm)(vcpu, buf))
+ if (static_call(kvm_x86_enter_smm)(vcpu, &smram))
goto error;
kvm_smm_changed(vcpu, true);
- if (kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf)))
+ if (kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, &smram, sizeof(smram)))
goto error;
if (static_call(kvm_x86_get_nmi_mask)(vcpu))
@@ -473,7 +474,7 @@ static int rsm_enter_protected_mode(struct kvm_vcpu *vcpu,
}
static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt,
- const char *smstate)
+ u8 *smstate)
{
struct kvm_vcpu *vcpu = ctxt->vcpu;
struct kvm_segment desc;
@@ -534,7 +535,7 @@ static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt,
#ifdef CONFIG_X86_64
static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt,
- const char *smstate)
+ u8 *smstate)
{
struct kvm_vcpu *vcpu = ctxt->vcpu;
struct kvm_segment desc;
@@ -606,13 +607,13 @@ int emulator_leave_smm(struct x86_emulate_ctxt *ctxt)
{
struct kvm_vcpu *vcpu = ctxt->vcpu;
unsigned long cr0, cr4, efer;
- char buf[512];
+ union kvm_smram smram;
u64 smbase;
int ret;
smbase = vcpu->arch.smbase;
- ret = kvm_vcpu_read_guest(vcpu, smbase + 0xfe00, buf, sizeof(buf));
+ ret = kvm_vcpu_read_guest(vcpu, smbase + 0xfe00, smram.bytes, sizeof(smram));
if (ret < 0)
return X86EMUL_UNHANDLEABLE;
@@ -666,13 +667,13 @@ int emulator_leave_smm(struct x86_emulate_ctxt *ctxt)
* state (e.g. enter guest mode) before loading state from the SMM
* state-save area.
*/
- if (static_call(kvm_x86_leave_smm)(vcpu, buf))
+ if (static_call(kvm_x86_leave_smm)(vcpu, &smram))
return X86EMUL_UNHANDLEABLE;
#ifdef CONFIG_X86_64
if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
- return rsm_load_state_64(ctxt, buf);
+ return rsm_load_state_64(ctxt, smram.bytes);
else
#endif
- return rsm_load_state_32(ctxt, buf);
+ return rsm_load_state_32(ctxt, smram.bytes);
}
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 2200b8aa727398..4cbb95796dcd63 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4436,12 +4436,14 @@ static int svm_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection)
return 1;
}
-static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
+static int svm_enter_smm(struct kvm_vcpu *vcpu, union kvm_smram *smram)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct kvm_host_map map_save;
int ret;
+ char *smstate = (char *)smram;
+
if (!is_guest_mode(vcpu))
return 0;
@@ -4483,7 +4485,7 @@ static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
return 0;
}
-static int svm_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
+static int svm_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct kvm_host_map map, map_save;
@@ -4491,6 +4493,8 @@ static int svm_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
struct vmcb *vmcb12;
int ret;
+ const char *smstate = (const char *)smram;
+
if (!guest_cpuid_has(vcpu, X86_FEATURE_LM))
return 0;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 107fc035c91b80..8c7890af11fb21 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7914,7 +7914,7 @@ static int vmx_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection)
return !is_smm(vcpu);
}
-static int vmx_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
+static int vmx_enter_smm(struct kvm_vcpu *vcpu, union kvm_smram *smram)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -7935,7 +7935,7 @@ static int vmx_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
return 0;
}
-static int vmx_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
+static int vmx_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
int ret;
--
2.34.3
^ permalink raw reply related [flat|nested] 18+ messages in thread
end of thread, other threads:[~2022-10-25 12:46 UTC | newest]
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2022-10-25 12:42 [PATCH v4 00/23] SMM emulation and interrupt shadow fixes Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 01/23] KVM: x86: start moving SMM-related functions to new files Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 02/23] KVM: x86: move SMM entry to a new file Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 03/23] KVM: x86: move SMM exit " Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 04/23] KVM: x86: do not go through ctxt->ops when emulating rsm Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 05/23] KVM: allow compiling out SMM support Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 06/23] KVM: x86: compile out vendor-specific code if SMM is disabled Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 07/23] KVM: x86: remove SMRAM address space if SMM is not supported Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 08/23] KVM: x86: do not define KVM_REQ_SMI if SMM disabled Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 09/23] bug: introduce ASSERT_STRUCT_OFFSET Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 10/23] KVM: x86: emulator: em_sysexit should update ctxt->mode Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 11/23] KVM: x86: emulator: introduce emulator_recalc_and_set_mode Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 12/23] KVM: x86: emulator: update the emulation mode after rsm Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 13/23] KVM: x86: emulator: update the emulation mode after CR0 write Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 14/23] KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 15/23] KVM: x86: smm: check for failures on smm entry Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 16/23] KVM: x86: smm: add structs for KVM's smram layout Maxim Levitsky
2022-10-25 12:42 ` [PATCH v4 17/23] KVM: x86: smm: use smram structs in the common code Maxim Levitsky
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