From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>
Cc: Peter H Anvin <hpa@zytor.com>,
Dave Hansen <dave.hansen@intel.com>,
Tony Luck <tony.luck@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Andi Kleen <ak@linux.intel.com>,
Kirill Shutemov <kirill.shutemov@linux.intel.com>,
Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
Sean Christopherson <seanjc@google.com>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
linux-kernel@vger.kernel.org, x86@kernel.org
Subject: [PATCH v1 08/11] x86/tdx: Add HLT support for TDX guest
Date: Tue, 1 Jun 2021 19:21:33 -0700 [thread overview]
Message-ID: <20210602022136.2186759-9-sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
In-Reply-To: <20210602022136.2186759-1-sathyanarayanan.kuppuswamy@linux.intel.com>
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Per Guest-Host-Communication Interface (GHCI) for Intel Trust
Domain Extensions (Intel TDX) specification, sec 3.8,
TDVMCALL[Instruction.HLT] provides HLT operation. Use it to implement
halt() and safe_halt() paravirtualization calls.
The same TDX hypercall is used to handle #VE exception due to
EXIT_REASON_HLT.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
arch/x86/kernel/tdx.c | 50 +++++++++++++++++++++++++++++++++++++------
1 file changed, 43 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c
index 527d2638ddae..76b71bf56b81 100644
--- a/arch/x86/kernel/tdx.c
+++ b/arch/x86/kernel/tdx.c
@@ -88,6 +88,33 @@ static void tdg_get_info(void)
td_info.attributes = out.rdx;
}
+static __cpuidle void tdg_halt(void)
+{
+ u64 ret;
+
+ ret = __tdx_hypercall(EXIT_REASON_HLT, irqs_disabled(), 0, 0, 0, NULL);
+
+ /* It should never fail */
+ BUG_ON(ret);
+}
+
+static __cpuidle void tdg_safe_halt(void)
+{
+ u64 ret;
+
+ /*
+ * Enable interrupts next to the TDVMCALL to avoid
+ * performance degradation.
+ */
+ local_irq_enable();
+
+ /* IRQ is enabled, So set R12 as 0 */
+ ret = __tdx_hypercall(EXIT_REASON_HLT, 0, 0, 0, 0, NULL);
+
+ /* It should never fail */
+ BUG_ON(ret);
+}
+
unsigned long tdg_get_ve_info(struct ve_info *ve)
{
u64 ret;
@@ -114,13 +141,19 @@ unsigned long tdg_get_ve_info(struct ve_info *ve)
int tdg_handle_virtualization_exception(struct pt_regs *regs,
struct ve_info *ve)
{
- /*
- * TODO: Add handler support for various #VE exit
- * reasons. It will be added by other patches in
- * the series.
- */
- pr_warn("Unexpected #VE: %lld\n", ve->exit_reason);
- return -EFAULT;
+ switch (ve->exit_reason) {
+ case EXIT_REASON_HLT:
+ tdg_halt();
+ break;
+ default:
+ pr_warn("Unexpected #VE: %lld\n", ve->exit_reason);
+ return -EFAULT;
+ }
+
+ /* After successful #VE handling, move the IP */
+ regs->ip += ve->instr_len;
+
+ return 0;
}
void __init tdx_early_init(void)
@@ -132,5 +165,8 @@ void __init tdx_early_init(void)
tdg_get_info();
+ pv_ops.irq.safe_halt = tdg_safe_halt;
+ pv_ops.irq.halt = tdg_halt;
+
pr_info("TDX guest is initialized\n");
}
--
2.25.1
next prev parent reply other threads:[~2021-06-02 2:22 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-02 2:21 [PATCH v1 00/11] Add TDX Guest Support (Initial support) Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 01/11] x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 02/11] x86/tdx: Introduce INTEL_TDX_GUEST config option Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 03/11] x86/cpufeatures: Add TDX Guest CPU feature Kuppuswamy Sathyanarayanan
2021-06-07 14:32 ` Tom Lendacky
2021-06-07 16:59 ` Kuppuswamy, Sathyanarayanan
2021-06-10 12:28 ` Borislav Petkov
2021-06-10 14:28 ` Kuppuswamy, Sathyanarayanan
2021-06-10 14:29 ` Kirill A. Shutemov
2021-06-10 14:35 ` Borislav Petkov
2021-06-10 14:41 ` Kirill A. Shutemov
2021-06-10 15:56 ` Borislav Petkov
2021-06-12 21:02 ` [PATCH v2 03/12] " Kuppuswamy Sathyanarayanan
2021-06-16 9:52 ` Borislav Petkov
2021-06-16 16:57 ` Kuppuswamy, Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 04/11] x86/x86: Add is_tdx_guest() interface Kuppuswamy Sathyanarayanan
2021-06-10 19:59 ` Borislav Petkov
2021-06-10 21:01 ` Kuppuswamy, Sathyanarayanan
2021-06-10 21:07 ` Borislav Petkov
2021-06-12 21:04 ` [PATCH v2 04/12] x86/x86: Add early_is_tdx_guest() interface Kuppuswamy Sathyanarayanan
2021-06-17 17:05 ` Borislav Petkov
2021-06-18 19:14 ` Kuppuswamy, Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 05/11] x86/tdx: Add __tdx_module_call() and __tdx_hypercall() helper functions Kuppuswamy Sathyanarayanan
2021-06-14 8:47 ` Borislav Petkov
2021-06-14 19:45 ` Kuppuswamy, Sathyanarayanan
2021-06-14 20:11 ` Borislav Petkov
2021-06-14 21:37 ` Kuppuswamy, Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 06/11] x86/tdx: Get TD execution environment information via TDINFO Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 07/11] x86/traps: Add #VE support for TDX guest Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` Kuppuswamy Sathyanarayanan [this message]
2021-06-02 2:21 ` [PATCH v1 09/11] x86/tdx: Wire up KVM hypercalls Kuppuswamy Sathyanarayanan
2021-06-12 21:08 ` [PATCH v2 10/12] " Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 10/11] x86/tdx: Add MSR support for TDX guest Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 11/11] x86/tdx: Handle CPUID via #VE Kuppuswamy Sathyanarayanan
-- strict thread matches above, loose matches on Subject: below --
2021-06-02 2:18 [PATCH v1 00/11] Add TDX Guest Support (Initial support) Kuppuswamy Sathyanarayanan
2021-06-02 2:18 ` [PATCH v1 08/11] x86/tdx: Add HLT support for TDX guest Kuppuswamy Sathyanarayanan
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