On 5/16/2023 5:32 PM, Peter Zijlstra wrote:
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1019,6 +1019,15 @@ SYM_CODE_END(paranoid_entry)
* R15 - old SPEC_CTRL
*/
SYM_CODE_START_LOCAL(paranoid_exit)
+#ifdef CONFIG_AMD_MEM_ENCRYPT
+ /*
+ * If a #HV was delivered during execution and interrupts were
+ * disabled, then check if it can be handled before the iret
+ * (which may re-enable interrupts).
+ */
+ mov %rsp, %rdi
+ call check_hv_pending
+#endif
UNWIND_HINT_REGS
/*
@@ -1143,6 +1152,15 @@ SYM_CODE_START(error_entry)
SYM_CODE_END(error_entry)
SYM_CODE_START_LOCAL(error_return)
+#ifdef CONFIG_AMD_MEM_ENCRYPT
+ /*
+ * If a #HV was delivered during execution and interrupts were
+ * disabled, then check if it can be handled before the iret
+ * (which may re-enable interrupts).
+ */
+ mov %rsp, %rdi
+ call check_hv_pending
+#endif
UNWIND_HINT_REGS
DEBUG_ENTRY_ASSERT_IRQS_OFF
testb $3, CS(%rsp)
Oh hell no... do now you're adding unconditional calls to every single
interrupt and nmi exit path, with the grand total of 0 justification.
Sorry to Add check inside of check_hv_pending(). Will move the check
before calling check_hv_pending() in the next version. Thanks.
