linux-kernel - [PATCH 0/2] fix clobbers list with ZERO_CALL_USED

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Message-ID: <20220902213750.1124421-1-morbo@google.com>
Date:   Fri,  2 Sep 2022 21:37:48 +0000
From:   Bill Wendling <morbo@...gle.com>
To:     Juergen Gross <jgross@...e.com>,
        "Srivatsa S. Bhat (VMware)" <srivatsa@...il.mit.edu>,
        Alexey Makhalov <amakhalov@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        llvm@...ts.linux.dev
Cc:     Bill Wendling <morbo@...gle.com>
Subject: [PATCH 0/2] fix clobbers list with ZERO_CALL_USED_REGS feature

The ZERO_CALL_USED_REGS feature may zero out callee-saved registers. This needs
to be properly modeled by things like code alternatives. Otherwise, it's
possible that a callee-saved register would be expected to remain unchanged
past an ASM statement when in reality it isn't.

Bill Wendling (2):
  x86/paravirt: clean up typos and grammaros
  x86/paravirt: add extra clobbers with ZERO_CALL_USED_REGS enabled

 arch/x86/include/asm/paravirt_types.h | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

-- 
2.37.2.789.g6183377224-goog