From: Joerg Roedel <joro@8bytes.org>
To: x86@kernel.org
Cc: Joerg Roedel <joro@8bytes.org>, Joerg Roedel <jroedel@suse.de>,
hpa@zytor.com, Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Jiri Slaby <jslaby@suse.cz>,
Dan Williams <dan.j.williams@intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Juergen Gross <jgross@suse.com>,
Kees Cook <keescook@chromium.org>,
David Rientjes <rientjes@google.com>,
Cfir Cohen <cfir@google.com>, Erdem Aktas <erdemaktas@google.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Mike Stunes <mstunes@vmware.com>,
Sean Christopherson <seanjc@google.com>,
Martin Radev <martin.b.radev@gmail.com>,
Arvind Sankar <nivedita@alum.mit.edu>,
linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, virtualization@lists.linux-foundation.org
Subject: [PATCH v3 4/7] x86/sev-es: Run #VC handler in plain IRQ state
Date: Tue, 8 Jun 2021 11:54:36 +0200 [thread overview]
Message-ID: <20210608095439.12668-5-joro@8bytes.org> (raw)
In-Reply-To: <20210608095439.12668-1-joro@8bytes.org>
From: Joerg Roedel <jroedel@suse.de>
Use irqentry_enter() and irqentry_exit() to track the runtime state of
the #VC handler. The reason it ran in NMI mode was solely to make sure
nothing interrupts the handler while the GHCB is in use.
This is handled now in sev_es_get/put_ghcb() directly, so there is no
reason the #VC handler can not run in normal IRQ mode and enjoy the
benefits like being able to send signals.
Fixes: 62441a1fb532 ("x86/sev-es: Correctly track IRQ states in runtime #VC handler")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
arch/x86/kernel/sev.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index 2a922d1b03c8..b563fb747aed 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -1354,8 +1354,7 @@ DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
return;
}
- irq_state = irqentry_nmi_enter(regs);
- lockdep_assert_irqs_disabled();
+ irq_state = irqentry_enter(regs);
instrumentation_begin();
/*
@@ -1408,7 +1407,7 @@ DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
out:
instrumentation_end();
- irqentry_nmi_exit(regs, irq_state);
+ irqentry_exit(regs, irq_state);
return;
--
2.31.1
WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro@8bytes.org>
To: x86@kernel.org
Cc: kvm@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
virtualization@lists.linux-foundation.org,
Arvind Sankar <nivedita@alum.mit.edu>,
hpa@zytor.com, Jiri Slaby <jslaby@suse.cz>,
Joerg Roedel <joro@8bytes.org>,
David Rientjes <rientjes@google.com>,
Martin Radev <martin.b.radev@gmail.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Joerg Roedel <jroedel@suse.de>, Kees Cook <keescook@chromium.org>,
Cfir Cohen <cfir@google.com>,
linux-coco@lists.linux.dev, Andy Lutomirski <luto@kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
Juergen Gross <jgross@suse.com>, Mike Stunes <mstunes@vmware.com>,
Sean Christopherson <seanjc@google.com>,
linux-kernel@vger.kernel.org,
Masami Hiramatsu <mhiramat@kernel.org>,
Erdem Aktas <erdemaktas@google.com>
Subject: [PATCH v3 4/7] x86/sev-es: Run #VC handler in plain IRQ state
Date: Tue, 8 Jun 2021 11:54:36 +0200 [thread overview]
Message-ID: <20210608095439.12668-5-joro@8bytes.org> (raw)
In-Reply-To: <20210608095439.12668-1-joro@8bytes.org>
From: Joerg Roedel <jroedel@suse.de>
Use irqentry_enter() and irqentry_exit() to track the runtime state of
the #VC handler. The reason it ran in NMI mode was solely to make sure
nothing interrupts the handler while the GHCB is in use.
This is handled now in sev_es_get/put_ghcb() directly, so there is no
reason the #VC handler can not run in normal IRQ mode and enjoy the
benefits like being able to send signals.
Fixes: 62441a1fb532 ("x86/sev-es: Correctly track IRQ states in runtime #VC handler")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
arch/x86/kernel/sev.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index 2a922d1b03c8..b563fb747aed 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -1354,8 +1354,7 @@ DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
return;
}
- irq_state = irqentry_nmi_enter(regs);
- lockdep_assert_irqs_disabled();
+ irq_state = irqentry_enter(regs);
instrumentation_begin();
/*
@@ -1408,7 +1407,7 @@ DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
out:
instrumentation_end();
- irqentry_nmi_exit(regs, irq_state);
+ irqentry_exit(regs, irq_state);
return;
--
2.31.1
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next prev parent reply other threads:[~2021-06-08 9:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-08 9:54 [PATCH v3 0/7] x86/sev-es: Fixes for SEV-ES Guest Support Joerg Roedel
2021-06-08 9:54 ` Joerg Roedel
2021-06-08 9:54 ` [PATCH v3 1/7] x86/ioremap: Map efi_mem_reserve() memory as encrypted for SEV Joerg Roedel
2021-06-08 9:54 ` Joerg Roedel
2021-06-08 15:26 ` [tip: x86/urgent] x86/ioremap: Map EFI-reserved " tip-bot2 for Tom Lendacky
2021-06-08 9:54 ` [PATCH v3 2/7] x86/sev-es: Fix error message in runtime #VC handler Joerg Roedel
2021-06-08 9:54 ` Joerg Roedel
2021-06-08 9:54 ` [PATCH v3 3/7] x86/sev-es: Disable IRQs while GHCB is active Joerg Roedel
2021-06-08 9:54 ` Joerg Roedel
2021-06-08 9:54 ` Joerg Roedel [this message]
2021-06-08 9:54 ` [PATCH v3 4/7] x86/sev-es: Run #VC handler in plain IRQ state Joerg Roedel
2021-06-08 11:58 ` Peter Zijlstra
2021-06-08 11:58 ` Peter Zijlstra
2021-06-08 13:25 ` Joerg Roedel
2021-06-08 13:25 ` Joerg Roedel
2021-06-08 9:54 ` [PATCH v3 5/7] x86/insn-eval: Make 0 a valid RIP for insn_get_effective_ip() Joerg Roedel
2021-06-08 9:54 ` Joerg Roedel
2021-06-08 9:54 ` [PATCH v3 6/7] x86/insn: Extend error reporting from insn_fetch_from_user[_inatomic]() Joerg Roedel
2021-06-08 9:54 ` Joerg Roedel
2021-06-08 9:54 ` [PATCH v3 7/7] x86/sev-es: Propagate #GP if getting linear instruction address failed Joerg Roedel
2021-06-08 9:54 ` Joerg Roedel
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