Attached is patch for HVM guests (VMX only) that prints VMCS areas for
all vcpus. A new hotkey ('v') triggers the dump.
We also print VMCS for current processor when vmenter fails.
-boris
# Add hotkey 'v' to hypervisor monitor to print VMCS areas.
# When crashing domain due failed vmenter print processor's VMCS.
Signed-off-by: Boris Ostrovsky bostrovsky@xxxxxxxxxxxxxxx
diff -r dc213d745642 xen/arch/x86/hvm/vmx/vmcs.c
--- a/xen/arch/x86/hvm/vmx/vmcs.c Mon May 15 16:32:09 2006 +0100
+++ b/xen/arch/x86/hvm/vmx/vmcs.c Tue May 16 14:55:51 2006 -0400
@@ -35,6 +35,7 @@
#include <xen/event.h>
#include <xen/kernel.h>
#include <asm/shadow.h>
+#include <xen/keyhandler.h>
#if CONFIG_PAGING_LEVELS >= 3
#include <asm/shadow_64.h>
#endif
@@ -542,6 +543,101 @@ void arch_vmx_do_launch(struct vcpu *v)
reset_stack_and_jump(vmx_asm_do_launch);
}
+
+/* Dump a section of VMCS */
+static void print_section(char *header, uint32_t start,
+ uint32_t end, int incr)
+{
+ uint32_t addr, j;
+ unsigned long val;
+ int code;
+ char *fmt[4] = {"0x%04lx ", "0x%016lx ", "0x%08lx ", "0x%016lx "};
+ char *err[4] = {"------ ", "------------------ ",
+ "---------- ", "------------------ "};
+
+ /* Find width of the field (encoded in bits 14:13 of address) */
+ code = (start>>13)&3;
+
+ if (header)
+ printk("\t %s", header);
+
+ for (addr=start, j=0; addr<=end; addr+=incr, j++) {
+
+ if (!(j&3))
+ printk("\n\t\t0x%08x: ", addr);
+
+ if (!__vmread(addr, &val))
+ printk(fmt[code], val);
+ else
+ printk("%s", err[code]);
+ }
+
+ printk("\n");
+}
+
+/* Dump current VMCS */
+void vmcs_dump_vcpu(void)
+{
+ print_section("16-bit Guest-State Fields", 0x800, 0x80e, 2);
+ print_section("16-bit Host-State Fields", 0xc00, 0xc0c, 2);
+ print_section("64-bit Control Fields", 0x2000, 0x2013, 1);
+ print_section("64-bit Guest-State Fields", 0x2800, 0x2803, 1);
+ print_section("32-bit Control Fields", 0x4000, 0x401c, 2);
+ print_section("32-bit RO Data Fields", 0x4400, 0x440e, 2);
+ print_section("32-bit Guest-State Fields", 0x4800, 0x482a, 2);
+ print_section("32-bit Host-State Fields", 0x4c00, 0x4c00, 2);
+ print_section("Natural 64-bit Control Fields", 0x6000, 0x600e, 2);
+ print_section("64-bit RO Data Fields", 0x6400, 0x640A, 2);
+ print_section("Natural 64-bit Guest-State Fields", 0x6800, 0x6826, 2);
+ print_section("Natural 64-bit Host-State Fields", 0x6c00, 0x6c16, 2);
+}
+
+
+static void vmcs_dump(unsigned char ch)
+{
+ struct domain *d;
+ struct vcpu *v;
+
+ printk("*********** VMCS Areas **************\n");
+ for_each_domain(d) {
+ printk("\n>>> Domain %d <<<\n", d->domain_id);
+ for_each_vcpu(d, v) {
+
+ /*
+ * Presumably, if a domain is not an HVM guest,
+ * the very first CPU will not pass this test
+ */
+ if (!hvm_guest(v)) {
+ printk("\t\tNot HVM guest\n");
+ break;
+ }
+ printk("\tVCPU %d\n", v->vcpu_id);
+
+ if (v != current) {
+ vcpu_pause(v);
+ __vmptrld(virt_to_maddr(v->arch.hvm_vmx.vmcs));
+ }
+
+ vmcs_dump_vcpu();
+
+ if (v != current) {
+ __vmptrld(virt_to_maddr(current->arch.hvm_vmx.vmcs));
+ vcpu_unpause(v);
+ }
+ }
+ }
+
+ printk("**************************************\n");
+}
+
+static int __init setup_vmcs_dump(void)
+{
+ register_keyhandler('v', vmcs_dump, "dump Intel's VMCS");
+ return 0;
+}
+
+__initcall(setup_vmcs_dump);
+
/*
* Local variables:
* mode: C
diff -r dc213d745642 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c Mon May 15 16:32:09 2006 +0100
+++ b/xen/arch/x86/hvm/vmx/vmx.c Tue May 16 14:55:51 2006 -0400
@@ -2082,7 +2082,10 @@ asmlinkage void vmx_vmexit_handler(struc
HVM_DBG_LOG(DBG_LEVEL_0, "exit reason = %x", exit_reason);
if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) {
- printk("Failed vm entry\n");
+ printk("Failed vm entry (reason 0x%x)\n", exit_reason);
+ printk("*********** VMCS Area **************\n");
+ vmcs_dump_vcpu();
+ printk("**************************************\n");
domain_crash_synchronous();
return;
}
diff -r dc213d745642 xen/include/asm-x86/hvm/vmx/vmcs.h
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h Mon May 15 16:32:09 2006 +0100
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h Tue May 16 14:55:51 2006 -0400
@@ -26,7 +26,7 @@
extern int start_vmx(void);
extern void stop_vmx(void);
-
+extern void vmcs_dump_vcpu(void);
void vmx_final_setup_guest(struct vcpu *v);
void vmx_enter_scheduler(void);
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