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bh=BlRmMyTPIZgZe3Qeld0d1Einv0prT8I9aNc0UH58IMU=; b=AbDNa7aJqusHi4pYIsCnH1ryLEMulXdbBKiPOz2Po+nJKQBhqa1pHizdmhU8H9QaKk RYtuAPLEhRiJY0ONMHfbsuXhlxYrNaMkf36jtrV+3Ep/XydJo0Z49r3n5HNleULtiLc4 OEPVjZ45vhrIO/qFukjjFPVFHj7FQVuw1Z452tzPHXFGjQ5U3PKT4CTbJ42AXZthUCSP mnn4OBmVOP9V3hMaZPkywj1tJNz4di5AZsLjcUTrNBOSPSwjJLuGeZFtkZzdhV1QCqvV MGNt9AUcFt8lGv6mQM+X2BEzO2gV6mQB4D23N+8FOgELnCcQbf24F8Q7DX/JgtG+amzf rDUw== X-Gm-Message-State: AOAM5330SYkOzwITcY6Gh5PYd6bdAXtaCmBH6+YRGTXmu+Qa8T3Jt+aZ FrzxrhRaJcS2fVlUP1+vnb6u4dwNaltoiJKXoFuPXaOOPS81UambaKYiHBXgKiiTgMk2Ms+SwI5 nYUhtv0G2HC6P/7v029KS3sM2yL6fLQUyflJY4p1puDHMhJKDZ3iMql48GBY8QRtRXePV2w== X-Google-Smtp-Source: ABdhPJz5XACgYsgbQjjqYUTiI20q8JUvEdMX3iHjZFcxlfZdmene/KBv258Vcs5/J0NQFDH2kDVJVRru70s= X-Received: by 2002:a0c:ed2b:: with SMTP id u11mr699870qvq.45.1594838701491; Wed, 15 Jul 2020 11:45:01 -0700 (PDT) Date: Wed, 15 Jul 2020 19:44:07 +0100 In-Reply-To: <20200715184438.1390996-1-ascull@google.com> Message-Id: <20200715184438.1390996-7-ascull@google.com> Mime-Version: 1.0 References: <20200715184438.1390996-1-ascull@google.com> X-Mailer: git-send-email 2.27.0.389.gc38d7665816-goog Subject: [PATCH 06/37] KVM: arm64: Only check pending interrupts if it would trap From: Andrew Scull To: kvmarm@lists.cs.columbia.edu Cc: maz@kernel.org, kernel-team@android.com X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Allow entry to a vcpu that can handle interrupts if there is an interrupts pending. Entry will still be aborted if the vcpu cannot handle interrupts. This allows use of __guest_enter to enter into the host. Signed-off-by: Andrew Scull --- arch/arm64/kvm/hyp/entry.S | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S index ee32a7743389..6a641fcff4f7 100644 --- a/arch/arm64/kvm/hyp/entry.S +++ b/arch/arm64/kvm/hyp/entry.S @@ -73,13 +73,17 @@ SYM_FUNC_START(__guest_enter) save_sp_el0 x1, x2 // Now the host state is stored if we have a pending RAS SError it must - // affect the host. If any asynchronous exception is pending we defer - // the guest entry. The DSB isn't necessary before v8.2 as any SError - // would be fatal. + // affect the host. If physical IRQ interrupts are going to be trapped + // and there are already asynchronous exceptions pending then we defer + // the entry. The DSB isn't necessary before v8.2 as any SError would + // be fatal. alternative_if ARM64_HAS_RAS_EXTN dsb nshst isb alternative_else_nop_endif + mrs x1, hcr_el2 + and x1, x1, #HCR_IMO + cbz x1, 1f mrs x1, isr_el1 cbz x1, 1f mov x0, #ARM_EXCEPTION_IRQ -- 2.27.0.389.gc38d7665816-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm