From: Gerd Hoffmann <kraxel@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Cc: kvm@vger.kernel.org, linux-coco@lists.linux.dev,
Gerd Hoffmann <kraxel@redhat.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] x86/sev/vc: fix efi runtime instruction emulation
Date: Tue, 27 May 2025 16:45:44 +0200 [thread overview]
Message-ID: <20250527144546.42981-1-kraxel@redhat.com> (raw)
In case efi_mm is active go use the userspace instruction decoder which
supports fetching instructions from active_mm. This is needed to make
instruction emulation work for EFI runtime code, so it can use cpuid
and rdmsr.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
arch/x86/coco/sev/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c
index 36beaac713c1..145f594d7e6b 100644
--- a/arch/x86/coco/sev/core.c
+++ b/arch/x86/coco/sev/core.c
@@ -346,7 +346,7 @@ static enum es_result __vc_decode_kern_insn(struct es_em_ctxt *ctxt)
static enum es_result vc_decode_insn(struct es_em_ctxt *ctxt)
{
- if (user_mode(ctxt->regs))
+ if (user_mode(ctxt->regs) || current->active_mm == &efi_mm)
return __vc_decode_user_insn(ctxt);
else
return __vc_decode_kern_insn(ctxt);
--
2.49.0
next reply other threads:[~2025-05-27 14:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-27 14:45 Gerd Hoffmann [this message]
2025-05-27 14:45 ` [PATCH 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa pages too Gerd Hoffmann
2025-05-27 16:44 ` Dionna Amalie Glaze
2025-05-28 7:16 ` Gerd Hoffmann
2025-05-27 16:21 ` [PATCH 1/2] x86/sev/vc: fix efi runtime instruction emulation Borislav Petkov
2025-05-28 7:38 ` Gerd Hoffmann
2025-05-29 23:02 ` Borislav Petkov
2025-06-02 10:04 ` Gerd Hoffmann
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