[RFCv2 06/13] x86/realmode: Share trampoline area if KVM memory protection enabled
From: Kirill A. Shutemov <hidden>
Date: 2021-04-16 15:42:00
Also in:
kvm, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
If KVM memory protection is active, the trampoline area will need to be in shared memory. Signed-off-by: Kirill A. Shutemov <redacted> --- arch/x86/realmode/init.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index 22fda7d99159..f3b54b5da693 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c@@ -10,6 +10,7 @@ #include <asm/tlbflush.h> #include <asm/crash.h> #include <asm/sev-es.h> +#include <asm/kvm_para.h> struct real_mode_header *real_mode_header; u32 *trampoline_cr4_features;
@@ -75,11 +76,11 @@ static void __init setup_real_mode(void) base = (unsigned char *)real_mode_header; /* - * If SME is active, the trampoline area will need to be in - * decrypted memory in order to bring up other processors + * If SME or KVM memory protection is active, the trampoline area will + * need to be in decrypted memory in order to bring up other processors * successfully. This is not needed for SEV. */ - if (sme_active()) + if (sme_active() || kvm_mem_protected()) set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT); memcpy(base, real_mode_blob, size);
--
2.26.3