On 3.10.23 г. 9:24 ч., Xin Li wrote:
This patch set enables the Intel flexible return and event delivery
(FRED) architecture for x86-64.
Which tree is this based on now? I tried running 'b4 diff' but it
complains it can't find some context around arch/x86/kernel/cpu/common.c
. I have
On 23.09.23 г. 12:41 ч., Xin Li wrote:
Intel VT-x classifies events into eight different types, which is
inherited by FRED for event identification. As such, event type
becomes a common x86 concept, and should be defined in a common x86
header.
Add event type macros to , and use it in .
On 14.09.23 г. 7:48 ч., Xin Li wrote:
In IRQ/NMI induced VM exits, KVM VMX needs to execute the respective
handlers, which requires the software to create a FRED stack frame,
and use it to invoke the handlers. Add fred_irq_entry_from_kvm() for
this job.
Export fred_entry_from_kvm() because
On 14.09.23 г. 7:47 ч., Xin Li wrote:
From: "H. Peter Anvin (Intel)"
The code to actually handle kernel and event entry/exit using
FRED. It is split up into two files thus:
- entry_64_fred.S contains the actual entrypoints and exit code, and
saves and restores registers.
- entry_fred.c
On 20.09.23 г. 20:23 ч., Li, Xin3 wrote:
+struct fred_ss {
+ u64 ss : 16, // SS selector
Is this structure conformant to the return state as described in FRED 5.0?
— The stack segment of the interrupted context, 64 bits formatted as follows:
• Bits 15:0 contain the SS
On 14.09.23 г. 7:47 ч., Xin Li wrote:
FRED defines additional information in the upper 48 bits of cs/ss
fields. Therefore add the information definitions into the pt_regs
structure.
Specially introduce a new structure fred_ss to denote the FRED flags
above SS selector, which avoids FRED_SSX_
On 14.09.23 г. 7:47 ч., Xin Li wrote:
From: "H. Peter Anvin (Intel)"
Add X86_CR4_FRED macro for the FRED bit in %cr4. This bit must not be
changed after initialization, so add it to the pinned CR4 bits.
Signed-off-by: H. Peter Anvin (Intel)
Tested-by: Shan Kang
Signed-off-by: Xin Li
---
On 14.09.23 г. 7:47 ч., Xin Li wrote:
From: "H. Peter Anvin (Intel)"
Add CONFIG_X86_FRED to to make
cpu_feature_enabled() work correctly with FRED.
Originally-by: Megha Dey
Signed-off-by: H. Peter Anvin (Intel)
Tested-by: Shan Kang
Signed-off-by: Xin Li
---
On 14.09.23 г. 7:47 ч., Xin Li wrote:
Briefly introduce FRED, and its advantages compared to IDT.
Signed-off-by: Xin Li
---
Documentation/arch/x86/x86_64/fred.rst | 98 +
Documentation/arch/x86/x86_64/index.rst | 1 +
2 files changed, 99 insertions(+)
create
On 14.09.23 г. 7:47 ч., Xin Li wrote:
Add an always inline API __wrmsrns() to embed the WRMSRNS instruction
into the code.
Tested-by: Shan Kang
Signed-off-by: Xin Li
---
arch/x86/include/asm/msr.h | 18 ++
1 file changed, 18 insertions(+)
diff --git
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