v2:
- Don't use vcpu->arch.efer when GUEST_IA32_EFER is not available (Paolo).
- Dump the MSR autoload/autosave lists (Paolo).
v3:
- Rebase to master.
- Check only the load controls (Sean).
- Always show the PTPRs from the VMCS if they exist (Jim/Sean).
- Dig EFER out of the MSR autoload list if it's there (Paulo).
- Calculate and show the effective EFER if it is not coming from
either the VMCS or the MSR autoload list (Sean).
v4:
- Ensure that each changeset builds with just the previous set.
David Edmondson (5):
KVM: x86: dump_vmcs should not assume GUEST_IA32_EFER is valid
KVM: x86: dump_vmcs should not conflate EFER and PAT presence in VMCS
KVM: x86: dump_vmcs should consider only the load controls of EFER/PAT
KVM: x86: dump_vmcs should show the effective EFER
KVM: x86: dump_vmcs should include the autoload/autostore MSR lists
arch/x86/kvm/vmx/vmx.c | 58 +++++++++++++++++++++++++++++-------------
arch/x86/kvm/vmx/vmx.h | 2 +-
2 files changed, 42 insertions(+), 18 deletions(-)
--
2.30.0
When dumping the current VMCS state, include the MSRs that are being
automatically loaded/stored during VM entry/exit.
Signed-off-by: David Edmondson <[email protected]>
---
arch/x86/kvm/vmx/vmx.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index b9bb66ad2ac4..de42b8c14a38 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5810,6 +5810,16 @@ static void vmx_dump_dtsel(char *name, uint32_t limit)
vmcs_readl(limit + GUEST_GDTR_BASE - GUEST_GDTR_LIMIT));
}
+static void vmx_dump_msrs(char *name, struct vmx_msrs *m)
+{
+ unsigned int i;
+ struct vmx_msr_entry *e;
+
+ pr_err("MSR %s:\n", name);
+ for (i = 0, e = m->val; i < m->nr; ++i, ++e)
+ pr_err(" %2d: msr=0x%08x value=0x%016llx\n", i, e->index, e->value);
+}
+
void dump_vmcs(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -5891,6 +5901,10 @@ void dump_vmcs(struct kvm_vcpu *vcpu)
if (secondary_exec_control & SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY)
pr_err("InterruptStatus = %04x\n",
vmcs_read16(GUEST_INTR_STATUS));
+ if (vmcs_read32(VM_ENTRY_MSR_LOAD_COUNT) > 0)
+ vmx_dump_msrs("guest autoload", &vmx->msr_autoload.guest);
+ if (vmcs_read32(VM_EXIT_MSR_STORE_COUNT) > 0)
+ vmx_dump_msrs("guest autostore", &vmx->msr_autostore.guest);
pr_err("*** Host State ***\n");
pr_err("RIP = 0x%016lx RSP = 0x%016lx\n",
@@ -5920,6 +5934,8 @@ void dump_vmcs(struct kvm_vcpu *vcpu)
vmexit_ctl & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL)
pr_err("PerfGlobCtl = 0x%016llx\n",
vmcs_read64(HOST_IA32_PERF_GLOBAL_CTRL));
+ if (vmcs_read32(VM_EXIT_MSR_LOAD_COUNT) > 0)
+ vmx_dump_msrs("host autoload", &vmx->msr_autoload.host);
pr_err("*** Control State ***\n");
pr_err("PinBased=%08x CPUBased=%08x SecondaryExec=%08x\n",
--
2.30.0
If the VM entry/exit controls for loading/saving MSR_EFER are either
not available (an older processor or explicitly disabled) or not
used (host and guest values are the same), reading GUEST_IA32_EFER
from the VMCS returns an inaccurate value.
Because of this, in dump_vmcs() don't use GUEST_IA32_EFER to decide
whether to print the PDPTRs - always do so if the fields exist.
Fixes: 4eb64dce8d0a ("KVM: x86: dump VMCS on invalid entry")
Signed-off-by: David Edmondson <[email protected]>
if valid
---
arch/x86/kvm/vmx/vmx.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e0a3a9be654b..ea1b3a671d51 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5815,7 +5815,6 @@ void dump_vmcs(void)
u32 vmentry_ctl, vmexit_ctl;
u32 cpu_based_exec_ctrl, pin_based_exec_ctrl, secondary_exec_control;
unsigned long cr4;
- u64 efer;
if (!dump_invalid_vmcs) {
pr_warn_ratelimited("set kvm_intel.dump_invalid_vmcs=1 to dump internal KVM state.\n");
@@ -5827,7 +5826,6 @@ void dump_vmcs(void)
cpu_based_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
pin_based_exec_ctrl = vmcs_read32(PIN_BASED_VM_EXEC_CONTROL);
cr4 = vmcs_readl(GUEST_CR4);
- efer = vmcs_read64(GUEST_IA32_EFER);
secondary_exec_control = 0;
if (cpu_has_secondary_exec_ctrls())
secondary_exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
@@ -5839,9 +5837,7 @@ void dump_vmcs(void)
pr_err("CR4: actual=0x%016lx, shadow=0x%016lx, gh_mask=%016lx\n",
cr4, vmcs_readl(CR4_READ_SHADOW), vmcs_readl(CR4_GUEST_HOST_MASK));
pr_err("CR3 = 0x%016lx\n", vmcs_readl(GUEST_CR3));
- if ((secondary_exec_control & SECONDARY_EXEC_ENABLE_EPT) &&
- (cr4 & X86_CR4_PAE) && !(efer & EFER_LMA))
- {
+ if (cpu_has_vmx_ept()) {
pr_err("PDPTR0 = 0x%016llx PDPTR1 = 0x%016llx\n",
vmcs_read64(GUEST_PDPTR0), vmcs_read64(GUEST_PDPTR1));
pr_err("PDPTR2 = 0x%016llx PDPTR3 = 0x%016llx\n",
@@ -5867,7 +5863,8 @@ void dump_vmcs(void)
if ((vmexit_ctl & (VM_EXIT_SAVE_IA32_PAT | VM_EXIT_SAVE_IA32_EFER)) ||
(vmentry_ctl & (VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_IA32_EFER)))
pr_err("EFER = 0x%016llx PAT = 0x%016llx\n",
- efer, vmcs_read64(GUEST_IA32_PAT));
+ vmcs_read64(GUEST_IA32_EFER),
+ vmcs_read64(GUEST_IA32_PAT));
pr_err("DebugCtl = 0x%016llx DebugExceptions = 0x%016lx\n",
vmcs_read64(GUEST_IA32_DEBUGCTL),
vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS));
--
2.30.0