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[RFC,11/12] x86/sev: Handle CLFLUSH MMIO events

Message ID 20210705082443.14721-12-joro@8bytes.org (mailing list archive)
State New, archived
Headers show
Series x86/sev: KEXEC/KDUMP support for SEV-ES guests | expand

Commit Message

Joerg Roedel July 5, 2021, 8:24 a.m. UTC 
From: Joerg Roedel <jroedel@suse.de>

Handle CLFLUSH instruction to MMIO memory in the #VC handler. The
instruction is ignored by the handler, as the Hypervisor is
responsible for cache management of emulated MMIO memory.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 arch/x86/kernel/sev-shared.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
index a7a0793c4f98..682fa202444f 100644
--- a/arch/x86/kernel/sev-shared.c
+++ b/arch/x86/kernel/sev-shared.c
@@ -632,6 +632,15 @@  static enum es_result vc_handle_mmio_twobyte_ops(struct ghcb *ghcb,
 	long *reg_data;
 
 	switch (insn->opcode.bytes[1]) {
+		/* CLFLUSH */
+	case 0xae:
+		/*
+		 * Ignore CLFLUSHes - those go to emulated MMIO anyway and the
+		 * hypervisor is responsible for cache management.
+		 */
+		ret = ES_OK;
+		break;
+
 		/* MMIO Read w/ zero-extension */
 	case 0xb6:
 		bytes = 1;