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Date:   Fri,  2 Sep 2022 21:37:48 +0000
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Message-ID: <20220902213750.1124421-1-morbo@google.com>
Subject: [PATCH 0/2] fix clobbers list with ZERO_CALL_USED_REGS feature
From:   Bill Wendling <morbo@google.com>
To:     Juergen Gross <jgross@suse.com>,
        "Srivatsa S. Bhat (VMware)" <srivatsa@csail.mit.edu>,
        Alexey Makhalov <amakhalov@vmware.com>,
        VMware PV-Drivers Reviewers <pv-drivers@vmware.com>,
        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>,
        virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        llvm@lists.linux.dev
Cc:     Bill Wendling <morbo@google.com>
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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